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1000 C Questions & Answers

Internships in Automobile Engineering

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Bangalore Internships - Automobile Engineering

Sanfoundry located at Bangalore offers internships to deserving B.Tech/M.Tech Students in Automobile Engineering Branch. In Automobile Engineering internships offered by Sanfoundry, shortlisted interns will be working towards the creation of useful artifacts like questions and answers, tutorials, articles, real-world problems and solutions on Automobile Engineering. Moreover, every intern working on Automobile Engineering internship will focus on one specific subject under the Automobile branch. This will help the intern to develop an in-depth understanding of that particular subject in their branch.

Here’s the list of topics for Internship in “Automobile Engineering”.

  • Applied Thermodynamics
  • Two Phase flow and Heat Transfer
  • Air Conditioning and Ventilation
  • Air Pollution Control and Design of Equipment
  • Automotive Chassis, Suspension and Components Design
  • Automotive chassis & Suspension
  • Hybrid Vehicle Technology
  • Advance Strength of Materials
  • Auxiliary Systems of Automotive Engines
  • Automotive Fuels, Lubricants and Combustion
  • Automotive Pollution and Control
  • Automotive Transmission
  • Vehicle Maintenance
  • Statistics and Numerical Methods
  • Chemical Engineering Thermodynamics
  • CAD/CAM/CAE
  • Computer Aided Machine Drawing
  • Control Engineering
  • Design of Machine Elements
  • Kinematics and Dynamics of Machines
  • Applied Electronics and Microprocessors
  • Engine and Vehicle Management System
  • Design and Metallurgy of Welded Joints
  • Advance Engineering Thermodynamics
  • Mechanics of Materials
  • Modeling and Finite Element Analysis
  • Fluid Mechanics
  • Fluid Mechanics and Machinery
  • Rail Vehicle Dynamics
  • Convective Heat and Mass Transfer
  • Nontradtional Machining
  • Machine Shop and Tool Design
  • Manufacturing Processes
  • Advance Manufacturing Process Simulation and Management
  • Computer Science and Operation Research
  • Mechanical Measurements and Metallurgy
  • Flight Vehicle Design
  • Advance Theory of IC Engines
  • Automobile Engineering
  • Alternative Fuels and Energy Systems
  • Artificial Intelligence
  • Automotive Electrical and Electronics Systems
  • Automotive Aerodynamics
  • Refrigeration and Air conditioning
  • Automotive Safety
  • Design of Composite Materials
  • Computer Graphics
  • Computer Integrated Manufacturing and Automation
  • Programming Language DBMS
  • Automotive Engine Components Design and Auxiliary Systems
  • Design of Experiments and Sample Survey Methods
  • Design of Jigs, Fixtures and Press Tools
  • Disaster Resistant Building and Management
  • Earth Moving Equipments and Tractors
  • Engine Auxiliary Systems
  • Estimation, Costing and Specifications
  • Engineering System Design
  • Entrepreneurship Development, Management and Apparel Entrepreneurship
  • Advance Foundry Technology
  • Advance Gas Dynamics
  • Applied Tribology
  • Air Transport Management
  • Hydraulics and Pneumatics
  • Metrology and Instrumentation
  • Fundamentals and Applications of Nanotechnology
  • Vibration Analysis
  • off Road Vehicles
  • Industrial Engineering and Operations Research
  • Robotics
  • Smart Materials and Structures
  • Theory of Plasticity and Fracture Mechanics
  • New Total Quality Management
  • Basic Electrical Engineering
  • Basic Electronics Engineering
  • Partial Differential Equations and Transform Theorems
  • Computer Aided Engineering Drawing
  • Differential and Difference Equations
  • Elements of Civil Engineering and Engineering Mechanics
  • Elements of Mechanical Engineering
  • Engineering Chemistry
  • Engineering Mathematics
  • Advance Engineering Mathematics
  • Engineering Physics
  • Environmental Science and Engineering
  • Multivariable Calculus and Differential Equations
  • Probability and Statistics
  • Algorithms and Data Structures
  • Applications of Differential and Difference Equations
  • Sanfoundry is looking for Interns who are passionate about their field of study and like core subjects in Automobile Engineering. Every intern contributes to Sanfoundry’s Global learning project during their internship and is Mentored and Guided by our Founder and CTO. If you are interested to contribute and apply, here’s full detail of Sanfoundry’s Internship Program.

     
    Sanfoundry Global Education & Learning Series – Automobile Engineering Internships!




    Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @
    LinkedIn | Facebook | Twitter



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    Co-ordinate Compression Multiple Choice Questions and Answers (MCQs)

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    This set of Data Structures & Algorithms Multiple Choice Questions & Answers (MCQs) focuses on “Co-ordinate Compression”.

    1. What is co-ordinate compression?
    a) process of reassigning co-ordinates to remove gaps
    b) inserting gaps in a co-ordinate system
    c) removing redundant co-ordinates
    d) adding extra gaps
    View Answer

    Answer: a
    Explanation: Co-ordinate compression is the process of reassigning co-ordinates in order to remove gaps. This helps in improving efficiency of a solution.

    2. What is the need for co-ordinate compression?
    a) for improving time complexity
    b) for improving space complexity
    c) for improving both time and space complexity
    d) for making code simpler
    View Answer

    Answer: c
    Explanation:Co-ordinate compression is the process of reassigning co-ordinates in order to remove gaps. This helps in improving both time and space complexity of a solution.

    3. What is the output for the following code?

    #include <bits/stdc++.h> 
    using namespace std;  
    void convert(int a[], int n) 
    { 	
    	vector <pair<int, int> > vec;	
    	for (int i = 0; i < n; i++) 
    		vec.push_back(make_pair(a[i], i)); 
    	sort(vec.begin(), vec.end()); 	
    	for (int i=0; i<n; i++) 
    		a[vec[i].second] = i; 
    } 
    void printArr(int a[], int n) 
    { 
    	for (int i=0; i<n; i++) 
    		cout << a[i] << " "; 
    } 
    int main() 
    { 
    	int arr[] = {10,8,2,5,7}; 
    	int n = sizeof(arr)/sizeof(arr[0]);  
    	convert(arr , n); 
       	printArr(arr, n); 
    	return 0; 
    }

    a) 4 3 0 1 2
    b) 1 2 3 4 5
    c) 5 4 1 2 3
    d) 0 1 2 3 4
    View Answer

    Answer: a
    Explanation: The given code converts the elements of the input array. They are replaced with their respective position number in the sorted array.

    4. What will be the time complexity of given code?

    #include <bits/stdc++.h> 
    using namespace std;  
    void convert(int a[], int n) 
    { 	
    	vector <pair<int, int> > vec; 	
    	for (int i = 0; i < n; i++) 
    		vec.push_back(make_pair(a[i], i)); 	
    	sort(vec.begin(), vec.end()); 	
    	for (int i=0; i<n; i++) 
    		a[vec[i].second] = i; 
    } 
    void printArr(int a[], int n) 
    { 
    	for (int i=0; i<n; i++) 
    		cout << a[i] << " "; 
    } 
    int main() 
    { 
    	int arr[] = {10,8,2,5,7}; 
    	int n = sizeof(arr)/sizeof(arr[0]); 	
    	convert(arr , n); 
       	printArr(arr, n); 
    	return 0; 
    }

    a) O(n)
    b) O(n log n)
    c) O(n2)
    d) O(log n)
    View Answer

    Answer: b
    Explanation: The time complexity of the given code will be governed by the time complexity of the sorting algorithm used. As this code uses in built sorting of C++ so it will take O(n log n) time.

    5. What is the auxiliary space complexity of the given code?

    #include <bits/stdc++.h> 
    using namespace std;  
    void convert(int a[], int n) 
    { 	
    	vector <pair<int, int> > vec; 	
    	for (int i = 0; i < n; i++) 
    		vec.push_back(make_pair(a[i], i)); 	
    	sort(vec.begin(), vec.end()); 
    	for (int i=0; i<n; i++) 
    		a[vec[i].second] = i; 
    } 
    void printArr(int a[], int n) 
    { 
    	for (int i=0; i<n; i++) 
    		cout << a[i] << " "; 
    } 
    int main() 
    { 
    	int arr[] = {10,8,2,5,7}; 
    	int n = sizeof(arr)/sizeof(arr[0]);  
    	convert(arr , n); 
       	printArr(arr, n); 
    	return 0; 
    }

    a) O(1)
    b) O(n)
    c) O(log n)
    d) O(n log n)
    View Answer

    Answer: b
    Explanation: The given code uses an auxiliary space of O(n). It is used by a vector which pairs each element of the array with their respective index number of the original array.

    6. What will be the output of the following code?

    #include <bits/stdc++.h> 
    using namespace std; 
    void convert(int arr[], int n) 
    { 
    	int temp[n]; 
    	memcpy(temp, arr, n*sizeof(int)); 
    	sort(temp, temp + n); 	
            unordered_map<int, int> map; 	
    	int sort_index = 0; 
    	for (int i = 0; i < n; i++) 
    		map[temp[i]] = sort_index++; 	
    	for (int i = 0; i < n; i++) 
    		arr[i] = map[arr[i]]; 
    } 
    void printArr(int arr[], int n) 
    { 
    	for (int i=0; i<n; i++) 
    		cout << arr[i] << " "; 
    } 
    int main() 
    { 
    	int arr[] = {3,5,2,4}; 
    	int n = sizeof(arr)/sizeof(arr[0]); 
    	convert(arr , n); 	
    	printArr(arr, n); 
    	return 0; 
    }

    a) 0 2 3 4
    b) 1 3 0 2
    c) 2 4 1 3
    d) 1 2 3 4
    View Answer

    Answer: b
    Explanation: The given code converts the elements of input array. They are replaced with their respective position number in the sorted array.

    7. What is the time complexity of the following code?

    #include <bits/stdc++.h> 
    using namespace std; 
    void convert(int arr[], int n) 
    { 	
    	int temp[n]; 
    	memcpy(temp, arr, n*sizeof(int)); 
    	sort(temp, temp + n); 	
            unordered_map<int, int> map; 	
    	int sort_index = 0; 
    	for (int i = 0; i < n; i++) 
    		map[temp[i]] = sort_index++; 	
    	for (int i = 0; i < n; i++) 
    		arr[i] = map[arr[i]]; 
    } 
    void printArr(int arr[], int n) 
    { 
    	for (int i=0; i<n; i++) 
    		cout << arr[i] << " "; 
    } 
    int main() 
    { 
    	int arr[] = {10, 20, 15, 12, 11, 50}; 
    	int n = sizeof(arr)/sizeof(arr[0]); 
    	convert(arr , n); 	
    	printArr(arr, n); 
    	return 0; 
    }

    a) O(n)
    b) O(1)
    c) O(n log n)
    d) O(n2)
    View Answer

    Answer: c
    Explanation: The time complexity of the given code will be governed by the time complexity of the sorting algorithm used. As this code uses inbuilt sorting of C++ so it will take O(n log n) time.

    8. What will be the auxiliary space complexity of the following code?
    a) O(n)
    b) O(1)
    c) O(log n)
    d) O(n log n)
    View Answer

    Answer: a
    Explanation: The given code uses an auxiliary space of O(n). It is used by a vector which pairs each element of the array with their respective index number of the original array.

    9. Co-ordinate compression reduces the number of squares in a graph.
    a) true
    b) false
    View Answer

    Answer: a
    Explanation: The idea behind co-ordinate compression is to reduce the number of squares in a graph by converting them into rectangles of viable size. This reduces the time complexity of traversal.

    10. Co-ordinate compression can only be applied in a co-ordinate system problem
    a) true
    b) false
    View Answer

    Answer: b
    Explanation: Co-ordinate compression technique can be applied where such optimization is suitable. It does not require to co-ordinate system problem only.

    Sanfoundry Global Education & Learning Series – Data Structures & Algorithms.

    To practice all areas of Data Structures & Algorithms, here is complete set of 1000+ Multiple Choice Questions and Answers.



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    Filed Under: c programming Tagged With: •   Array-Recursion-Min-Max, •   Array-Recursion-Search - 1, •   Array-Recursion-Search - 2, •   Assembly Line Scheduling, •   Balanced Partition, •   Best First Search, •   Binary Search Iterative, •   Binary Tree Sort, •   Bipartite Graph, •   Bipartite Graphs Properties, •   Bogosort, •   Boolean Parenthesizations, •   Bottom Up Mergesort, •   Breadth First Search, •   Catalan Number, •   Chan's Algorithm, •   Closest Pair Problem, •   Co-ordinate Compression, •   Coin Change Problem, •   Comb Sort, •   Complete Bipartite Graph, •   Continuous Subarray - 1, •   Continuous Subarray - 2, •   Counting Sort, •   Decimal-Binary Conversion, •   Depth First Search, •   Dice Throw Problem, •   Digits Sum - Recursion, •   Dijkstra's Algorithm, •   Dynamic Programming, •   Edit Distance Problem, •   Eight Queens Problem, •   Euclid's Algorithm, •   Factorial using Recursion, •   Fibonacci Term, •   Fibonacci using Recursion, •   First-in First-out Algorithm, •   Fraction Knapsack Problem, •   GCD & LCM Recursion - 1, •   GCD & LCM Recursion - 2, •   Generating Combinations, •   Generating Partitions, •   Generating Permutations, •   Generating Subsets, •   Gnome Sort, •   Hamiltonian Path Problem, •   Hamming Code, •   Heapsort - 1, •   Heapsort - 2, •   Huffman Code, •   In-place Merge Sort, •   Inclusion Principle, •   Insertion Sort - 1, •   Insertion Sort - 2, •   Introsort, •   Jump Search, •   Kruskal's Algorithm, •   Linear Search Iterative, •   Linear Search Recursive, •   Linkedlist-Length-Recursion, •   Linkedlist-Recursion-Search, •   Lists-Recursion-Min-Max, •   Longest Subsequence, •   LSD Radix Sort, •   Matrix Multiplication, •   Max Bipartite Matching, •   Maximum Flow Problem, •   Minimum Cut, •   Minimum Number of Jumps, •   Minimum Spanning Tree, •   Monoalphabetic Cipher, •   Morse Code - 1, •   Morse Code - 2, •   N Queens Problem, •   Natural No's - Recursion, •   Non-recursive DFS, •   NP Complexity Classes, •   Number Power - Recursion, •   Odd-Even Sort, •   Optimal Page Replacement, •   Palindrome Min Insertions, •   Palindromic Subsequence, •   Pancake Sort, •   Permutation Sort, •   Polyalphabetic Cipher, •   Prim's Algorithm, •   Quick Search Algorithm, •   Quickhull, •   Quickselect, •   Quicksort - 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    Square Root Decomposition Multiple Choice Questions and Answers (MCQs)

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    This set of Data Structures & Algorithms Multiple Choice Questions & Answers (MCQs) focuses on “Square Root Decomposition”.

    1. What is the purpose of using square root decomposition?
    a) to reduce the time complexity of a code
    b) to increase the space complexity of a code
    c) to reduce the space complexity of a code
    d) to reduce the space and time complexity of a code
    View Answer

    Answer: a
    Explanation: Square decomposition is mainly used in competitive programming to optimize code. It reduces the time complexity by a factor of √n.

    2. By what factor time complexity is reduced when we apply square root decomposition to a code?
    a) n
    b) √n
    c) n2
    d) n-1/2
    View Answer

    Answer: b
    Explanation: In square root decomposition a given array is decomposed into small parts each of size √n. This reduces the time complexity of the code by a factor of √n.

    3. What will be the worst case time complexity of finding the sum of elements in a given range of (l,r) in an array of size n?
    a) O(n)
    b) O(l+r)
    c) O(l-r)
    d) O(r-l)
    View Answer

    Answer: a
    Explanation: For a given array of size n we have to traverse all n elements in the worst case. In such a case l=0, r=n-1 so the time complexity will be O(n).

    4. What will be the worst case time complexity of finding the sum of elements in a given range of (l,r) in an array of size n when we use square root optimization?
    a) O(n)
    b) O(l+r)
    c) O(√n)
    d) O(r-l)
    View Answer

    Answer: c
    Explanation: When we use square root optimization we decompose the given array into √n chunks each of size √n. So after calculating the sum of each chunk individually, we require to iterate only 3*√n times to calculate the sum in the worst case.

    5. Total how many iterations are required to find the sum of elements in a given range of (l,r) in an array of size n when we use square root optimization?
    a) √n
    b) 2*√n
    c) 3*√n
    d) n*√n
    View Answer

    Answer: c
    Explanation: After calculating the sum of each chunk individually we require to iterate only 3*√n times to calculate the sum in the worst case. It is because two of the √n factors consider the worst case time complexity of summing elements in the first and last block. Whereas the third √n considers the factor of summing the √n chunks.

    6. What will be the time complexity of update query operation in an array of size n when we use square root optimization?
    a) O(√n)
    b) O(n)
    c) O(1)
    d) O(n2)
    View Answer

    Answer:c
    Explanation: The time complexity of query operation remains the same in both square root optimized code and non optimized code. We simply find the chunk in which the update requires to be performed and then add the new updated value at the desired index.

    7. Square root decomposition technique is only applicable when the number of indices in an array is a perfect square.
    a) true
    b) false
    View Answer

    Answer: b
    Explanation: Square root decomposition technique can be applied to an array with any number of indices. It does not require this number to be a perfect square.

    8. What will be the worst case time complexity of code to find sum in given query range (l,r) in an array of size n with q number of such queries?
    a) O(n)
    b) O(q)
    c) O(n*q)
    d) O(n+q)
    View Answer

    Answer: c
    Explanation: For finding the result of one query the worst case time complexity will be n. So for q queries the time complexity will be O(q*n). This can be reduced by using square root optimization.

    9. What will be the worst case time complexity of code to find sum in given query range (l,r) in an array of size n with q number of such queries when we apply MO’s algorithm?
    a) O(n*q)
    b) O(n)
    c) O((q+n)√n)
    d) O(q*√n)
    View Answer

    Answer: c
    Explanation: Mo’s algorithm requires O(q*√n) + O(n*√n) time for processing all the queries. It is better than the naive solution where O(n*q) time is required.

    10. Mo’s algorithm can only be used for problems where the query can be calculated from the result of the previous query.
    a) true
    b) false
    View Answer

    Answer: a
    Explanation: Mo’s algorithm uses the result of the previous query in order to compute the result of the given query. It cannot be implemented where such a scenario is not possible.

    11. What will be the time complexity of the code to find a minimum element from an array of size n and uses square root decomposition(exclude pre processing time)?
    a) O(√n)
    b) O(n)
    c) O(1)
    d) O(n2)
    View Answer

    Answer: a
    Explanation: For finding the minimum element in a given array of size n using square root decomposition we first divide the array into √n chunks and calculate the result for them individually. So for a given query, the result of middle blocks has to be calculated along with the extreme elements. This takes O(√n) time in the worst case.

    Sanfoundry Global Education & Learning Series – Data Structures & Algorithms.

    To practice all areas of Data Structures & Algorithms, here is complete set of 1000+ Multiple Choice Questions and Answers.



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    Machine Drawing Questions and Answers – Thread Profile

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    This set of Machine Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Thread Profile”.

    1. If a screw thread advances in the nut when turned in a clockwise direction, it is called _________
    a) left hand helix
    b) right hand helix
    c) clockwise helix
    d) anticlockwise helix
    View Answer

    Answer: b
    Explanation: Right hand helix has the thread that advances in the nut when turned in a clockwise direction. When thread advances in the nut when turned in an anticlockwise direction then it is termed as left hand helix thread.

    2. Threads are classified into V thread, Acme thread, Knuckle thread, etc. on the basis of _________
    a) start of threads
    b) hand of helix
    c) profile of the groove
    d) surface
    View Answer

    Answer: c
    Explanation: On the basis of the profile of the groove, threads are classified as V thread, Acme thread, Knuckle thread, Buttress thread, Square thread, etc. On the basis of start of threads, threads are classified as single start, double start, triple start, etc.

    3. Pitch of the profile depends on the ______
    a) nominal diameter
    b) internal diameter
    c) external diameter
    d) mean diameter
    View Answer

    Answer: a
    Explanation: Threads are specified according to their pitch of profile. Pitch of the profile depends on the nominal diameter of the thread. The proportions of the profile are calculated in terms of the pitch.

    4. Metric threads are not termed as ___________
    a) BSW thread
    b) V thread
    c) American thread
    d) Unified thread
    View Answer

    Answer: a
    Explanation: A practical modification of V thread is called a metric thread. It is also called an American thread or Unified thread. All these have the included angle of 600. But in BSW thread included angle is 550 and hence it is different.

    5. Depth of thread is ______ times of pitch in case of British Standard Whitworth Thread.
    a) 0.75
    b) 0.64
    c) 0.55
    d) 0.80
    View Answer

    Answer: b
    Explanation: BSW threads are similar to the V threads, but the included angle is 55o. The depth of thread in case of BSW thread is 0.64 times of pitch of the thread. Radii at root and crest are 0.14 times that of pitch.

    6. Vice used for carpentry work has ______ thread.
    a) square
    b) buttress
    c) acme
    d) square
    View Answer

    Answer: b
    Explanation: Buttress threads are used where power is to be transmitted in a single direction only. Hence it is used in applications like vice used for carpentry work. It has efficiency as good as square thread and strength as much as V thread.

    7. Which of the following option do not specify a knuckle thread?
    a) Semi-circular profile of radius 1/4th of pitch
    b) Suitably formed by molding or rolling
    c) Used in sheet metal covers for jars
    d) Transmits power in one direction only
    View Answer

    Answer: d
    Explanation: Knuckle thread has a semi-circular profile of radius 1/4th of the pitch. Knuckle threads are suitably formed by molding as well as rolling and can be used in sheet metal covers for jars. But thread which can transmit power in one direction only is Buttress thread.

    8. Coarse pitches are used for ____________
    a) rough application
    b) general application
    c) precision application
    d) special application
    View Answer

    Answer: a
    Explanation: Pitch for the same diameter thread varies depending upon the application. Coarse pitch is used for rough application, medium pitch for general application and fine pitch is used for precision work.

    9. Square threads are used for ________
    a) power transmission
    b) clamping devices
    c) easy operation of engagement and disengagement
    d) fastening purpose
    View Answer

    Answer: a
    Explanation: Square thread is the simple and strong type of thread profile. It is used for power transmission. Its width and depth are equal to the half of the pitch.

    10. __________ is the slight improvement over square thread.
    a) Buttress thread
    b) Knuckle thread
    c) Acme thread
    d) BSW thread
    View Answer

    Answer: c
    Explanation: An acme thread is a slight improvement over square thread. Sides of the acme thread are inclined at 14.50. Square thread is difficult to cut because a parallel surface of both flanks and hence acme thread are used instead at some places.

    Sanfoundry Global Education & Learning Series – Machine Drawing.

    To practice all areas of Machine Drawing, here is complete set of 1000+ Multiple Choice Questions and Answers.



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    Machine Drawing Questions and Answers – Thread Designation

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    This set of Machine Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Thread Designation”.

    1. A metric thread is designated by _________
    a) its profile of the groove
    b) letter M
    c) its hand of the helix
    d) thread profile
    View Answer

    Answer: b
    Explanation: A metric thread is designated by letter M. It is then followed by major diameter in mm followed by the pitch with an ‘x’ sign in between the diameter and pitch. Coarse pitch is considered if the pitch is not defined.

    2. What do you mean by M10?
    a) Metric thread with a major diameter of 10.00mm and fine pitch
    b) Metric thread with a major diameter of 10.00mm and coarse pitch
    c) Metric thread with a major diameter of 10.00cm and fine pitch
    d) Metric thread with a minor diameter of 10.00mm and coarse pitch
    View Answer

    Answer: b
    Explanation: M denotes metric thread. 10 followed by M denotes a major diameter of thread in mm. here, pitch is not defined. So, it is taken as a coarse pitch thread.

    3. Which thread is denoted by SQ 40*10?
    a) Square thread with 40mm major diameter and 10mm pitch
    b) Square thread with 10mm major diameter and 40mm pitch
    c) Metric thread with 40mm major diameter and 10mm pitch
    d) Square thread with 40mm minor diameter and 10mm pitch
    View Answer

    Answer: a
    Explanation: If a thread is not a metric thread, type of thread is given in abbreviated form. Square thread is abbreviated as SQ. 40*10 denotes 40mm major diameter and 10mm pitch.

    5. If not specified, a left hand, single start thread of usual tolerance and grade is presumed.
    a) True
    b) False
    View Answer

    Answer: b
    Explanation: Threads are specified by type of thread profile, major diameter, tolerance, hand of helix and start of threads. If not specified, a right hand, single start thread of usual tolerance and grade is presumed.

    6. If a thread is specified as ‘M 16*1.5 8 g LH DOUBLE’, g stands for ____________
    a) type of pitch – coarse
    b) grade
    c) tolerance
    d) hand of the helix
    View Answer

    Answer: c
    Explanation: In a given thread specification g is used for tolerance. It is in lower case, representing external threads. If it is in upper case (G), it will be representing internal threads.

    7. How to specify metric thread with major diameter 45mm, 2mm pitch, grade 7, tolerance grade h (internal thread), right hand double start threaded profile?
    a) M 45*2-7-H-RH-DOUBLE
    b) M 45*2-7-h-RH-DOUBLE
    c) M 45*2-7-H-LH-DOUBLE
    d) M 45*7-2-H-RH-DOUBLE
    View Answer

    Answer: a
    Explanation: None.

    Sanfoundry Global Education & Learning Series – Machine Drawing.

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    Solid State Chemistry Questions and Answers – Intensities

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    This set of Solid State Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Intensities”.

    1. Intensities of X-ray reflections is important because___________
    a) The quantitative measurements of intensity are neccasary
    b) X-ray is detected using intensity
    c) Intensity is required during determining the concentration
    d) The environmental condition is suited using intensities
    View Answer

    Answer: a
    Explanation: Intensities of X-rays are important for two main reasons. First, quantitative measurements of intensity are necessary in order to determine unknown crystal structures. Second, qualitative or semi-quantitative intensity data are needed in using the power fingerprint method to characterize materials and especially in using the powder diffraction file to identify unknowns.

    2. Atoms diffract or scatter X-rays because of__________
    a) Incident visible light
    b) Incident X-ray beam
    c) Incident gamma ray
    d) Incident electrons
    View Answer

    Answer: b
    Explanation: An Atom diffract or scatter X-rays because of incident X-ray beam which can be described as an electromagnetic wave with an oscillating electric field, sets each electron of an atom into vibration.

    3. The electrons of an atom act as which of the following options for the sources of X-rays?
    a) Electrode
    b) Primary source
    c) Secondary source
    d) Tertiary source
    View Answer

    Answer: c
    Explanation: A vibrating charge such as an electron emits radiation and this radiation in in phase or coherent with the incident X-ray beam. The electrons of an atom therefore act as the secondary point sources of X-rays.

    4. The intensity of the radiation scattered coherently by ‘point source’ electrons has been treated theoretically and is given by which of the following equations?
    a) Einstein equation
    b) Maxwell equation
    c) Stockbarger equation
    d) Thomson equation
    View Answer

    Answer: d
    Explanation: Thomson equation is given by:-
    Ip α ½( 1+ cos22Θ)
    Here, Ip is the scattered intensity at any point P, and 2Θ is the angle between the directions of the incident beam and the diffracted beam that passes through P, from this equation it can be seen that the scattered beams are most intense when parallel or antiparallel to the incident beam and the weakest when at 90˚ to the incident beam.

    5. Thomson equation is also known as _________
    a) Diffraction factor
    b) Reflection factor
    c) Polarization factor
    d) Thomson factor
    View Answer

    Answer: c
    Explanation: The Thomson equation which is used to measure the intensity of the radiation scattered coherently by ‘point source’ electrons is also known as polarization factor and is one of the standard angular correction factors that must be applied during the processing of intensity data (for use in structure (determination).

    6. For the non-crystalline beams are scattered by the atoms _________
    a) From top to bottom
    b) In horizontal direction
    c) In vertical direction
    d) In all direction
    View Answer

    Answer: d
    Explanation: Each atom in a material acts as a secondary point source of X-rays. If the material is non-crystalline, beams are scattered by the atoms in all directions, but in crystalline materials the scattered beams interfere destructively in most possible directions.

    7. Intensities depends on which of the following factors?
    a) Solubility of the solid
    b) Emission factor
    c) Refraction factor
    d) Absorption factor
    View Answer

    Answer: d
    Explanation: Intensities depend on several factors, one of its factor is absorption factor, absorption of X-rays by the sample and depend on the form of the sample and geometry of the instrument. Ideally, for single crystal work, crystals should be spherical so as to have the same absorption factor in all directions.

    8. An electron density is a plot of variation of ______
    a) Electron density
    b) Electron solubility
    c) Electron mass
    d) Electron volume
    View Answer

    Answer: a
    Explanation: A plot of variation of electron density throughout the unit cell is known as electron density map. During the process of the solving an unknown structure it is often useful to construct electron density maps in order to try and locate atoms.

    9. An electron map resembles which of the following options?
    a) Electron spectrum
    b) Geographical contour map
    c) Diffraction spectrum
    d) Resolution electron map
    View Answer

    Answer: b
    Explanation: An electron map resembles a geographical contour map. The contours represent lines of constant electron density throughout the structure. Peaks of the electron density maxima may be distinguished clearly and these correspond to the atoms, the coordinates of the atoms in the unit cell are given by the coordinates of the peak maxima.

    10. The mental picture of atom is sphere can be given by which of the following?
    a) Pauli exclusion principle
    b) Maxwell equation
    c) Electron density map
    d) Stockbarger equation
    View Answer

    Answer: c
    Explanation: Electron density maps also show that our mental picture of atoms as spheres is essentially correct, at least on a time average. The electron density drops to almost zero at some point along point along the line connecting pairs of adjacent atom and this supports the model of ionic bonding in NaCl.

    Sanfoundry Global Education & Learning Series – Solid State Chemistry.

    To practice all areas of Solid State Chemistry, here is complete set of 1000+ Multiple Choice Questions and Answers.



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