Machine Design Multiple Choice Questions on “Design Considerations”.
1. Stressed parts are always kept in tension.
a) True
b) False
Answer: a
Clarification: Cast iron has more compressive strength.
2. Shot blasting process improves the endurance limit of the component.
a) True
b) False
Answer: a
Clarification: Shot blasting employs throwing wheel which imparts strength to the material.
3. Which process allows controlling grain structure of the product?
a) Casting
b) Forging
c) None of the mentioned
d) Die Casting
Answer: b
Clarification: In casting metal is in fluid state and hence impossible to control the grain structure.
4. While designing a forging, the profile is selected such that the fibrous lines are parallel to the tensile forces and perpendicular to shear forces.
a) True
b) False
Answer: a
Clarification: Tensile load is applied parallel to the grain structures.
5. Cast surfaces have good finishing.
a) True
b) False
Answer: b
Clarification: Cavity is surrounded by sand and hence not good finish is obtained.
6. In forging, metal is in which of the following stage?
a) Elastic
b) Plastic
c) Can be in any stage
d) Rigid
Answer: b
Clarification: Forging is the working of metal in plastic range.
7. Forged components can be held between close limits.
a) True
b) False
Answer: a
Clarification: There is no shrinkage problems and hence less tolerances.
8. Among casting, forging and forging which has the slowest rate of production?
a) Casting
b) Forging
c) Machining
d) All have equal rate of production
Answer: c
Clarification: Machining each part is very time consuming.
9. In manual assembly, cost of screw is higher than the cost of driving a screw.
a) True
b) False
Answer: b
Clarification: Generally manufacturing screw is cheaper than driving it.
10. Maximum carbon content in welding is usually limited to
a) 0.22%
b) 0.8%
c) 1.5%
d) 2%
Answer: a
Clarification: With increase of carbon, welding becomes difficult as weld becomes susceptible to cracks.