Q. Stressed parts are always kept in tension.
✅ Correct Answer: (A)
true
Explanation: cast iron has more compressive strength.
Design of Machine Elements MCQs | Page - 1
Dear candidates you will find MCQ questions of Design of Machine Elements here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.
Q. Which process allows controlling grain structure of the product?
✅ Correct Answer: (B)
forging
Explanation: in casting metal is in fluid state and hence impossible to control the grain structure.
Q. Cast surfaces have good finishing.
✅ Correct Answer: (B)
false
Explanation: cavity is surrounded by sand and hence not good finish is obtained.
Q. In forging, metal is in which of the following stage?
✅ Correct Answer: (B)
plastic
Explanation: forging is the working of metal in plastic range.
Q. Among casting, forging and forging which has the slowest rate of production?
✅ Correct Answer: (C)
machining
Explanation: machining each part is very time consuming.
Q. In manual assembly, cost of screw is higher than the cost of driving a screw.
✅ Correct Answer: (B)
false
Explanation: generally manufacturing screw is cheaper than driving it.
Q. Maximum carbon content in welding is usually limited to
✅ Correct Answer: (A)
0.22%
Explanation: with increase of carbon, welding becomes difficult as weld becomes susceptible to cracks.
Q. Why tolerances are given to the parts?
✅ Correct Answer: (A)
because it’s impossible to make perfect settings
Explanation: tolerances are provided to the parts because variations in the material properties introduce errors and production machines themselves have inherent inaccuracies. another reason to introduce tolerance is that it is not possible to make perfect settings by operator so some tolerances are provided.
Q. What is bilateral tolerance?
✅ Correct Answer: (B)
total tolerance is in both the directions
Explanation: total tolerance is specified on both the sides of the basic dimension. this usually have + and – tolerance of equal amount.
Q. What is mean clearance?
✅ Correct Answer: (C)
mean size of hole minus mean size of shaft
Explanation: statistical approach allows wider tolerances compared to complete interchangeability approach. methods used by statistical approach are usually permits cheaper production. mean clearance is equal to (mean size of hole – mean size of shaft).
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