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Mechanical - 540 - UNIT - 08 - Centre of Gravity Levers and Simple - MCQ

51)   

The formula for mechanical advantage is: 

A.
B.
C.
D.
Answer: A
52)   

If a machine can lift 100 N with 20 N effort, its MA is: 

A.
B.
C.
D.
Answer: C
53)   

Velocity Ratio depends on the geometry of the machine, not on: 

A.
B.
C.
D.
Answer: B
54)   

In a gear system, VR is given by:

A.
B.
C.
D.
Answer: B
55)   

Efficiency of a machine is reduced due to: 

A.
B.
C.
D.
Answer: C
56)   

Efficiency is calculated using the formula: 

A.
B.
C.
D.
Answer: A
57)   

An ideal elastic material returns to its original shape after: 

A.
B.
C.
D.
Answer: C
58)   

Unit of stress is:

A.
B.
C.
D.
Answer: C
59)   

Necking occurs in which stage of stress-strain curve?

A.
B.
C.
D.
Answer: D
60)   

Poisson’s ratio is the ratio of: 

A.
B.
C.
D.
Answer: B
61)   

Centre of gravity of a ring lies at its: 

A.
B.
C.
D.
Answer: C
62)   

Which factor does NOT affect the position of the centre of gravity?

A.
B.
C.
D.
Answer: C
63)   

Which of these machines is found in scissors? 

A.
B.
C.
D.
Answer: B
64)   

The wheelbarrow is an example of which type of lever?

A.
B.
C.
D.
Answer: B
65)   

Nut and bolt work on the principle of: 

A.
B.
C.
D.
Answer: D
66)   

In ideal machines, mechanical advantage equals: 

A.
B.
C.
D.
Answer: B
67)   

When effort increases, mechanical advantage: 

A.
B.
C.
D.
Answer: B
68)   

Young’s modulus is defined as the ratio of: 

A.
B.
C.
D.
Answer: A
69)   

If VR = 3 and MA = 1.5, the efficiency is:

A.
B.
C.
D.
Answer: B
70)   

The higher the VR, the more:

A.
B.
C.
D.
Answer: B
71)   

A machine with 100% efficiency is called:

A.
B.
C.
D.
Answer: A
72)   

Efficiency can be increased by reducing:

A.
B.
C.
D.
Answer: C
73)   

Which of the following has highest Young’s modulus?

A.
B.
C.
D.
Answer: B
74)   

Plastic region in stress-strain curve shows: 

A.
B.
C.
D.
Answer: B
75)   

Working stress is always: 

A.
B.
C.
D.
Answer: B