Mechanical Engineering - Machine Design

1. 

Which of the following property is desirable in parts subjected to shock and impact loads?

A. Strength
B. Stiffness
C. Brittleness
D. Toughness

Answer: Option D

Explanation:

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2. 

In block brakes, the ratio of shoe width to wheel diameter is taken between

A. 0.1 and 0.25
B. 0.25 and 0.50
C. 0.50 and 0.75
D. 0.75 and 1

Answer: Option B

Explanation:

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3. 

Oldham coupling is used to transmit power between two parallel shafts which are slightly offset.

A. True
B. False

Answer: Option A

Explanation:

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4. 

A shaft is subjected to fluctuating loads for which the normal torque (T) and bending moment (M) are 1000 N-m and 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting moment for the shaft is

A. 2000 N-m
B. 2050 N-m
C. 2100 N-m
D. 2136 N-m

Answer: Option D

Explanation:

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5. 

When a machine member is subjected to torsion, the torsional shear stress set up in the member is

A. zero at both the centroidal axis and outer surface of the member
B. maximum at both the centroidal axis and outer surface of the member
C. zero at the centroidal axis and maximum at the outer surface of the member
D. maximum at the centroidal axis and zero at the outer surface of the member

Answer: Option C

Explanation:

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