Mechanical Engineering - Machine Design

1. 

The major diameter of a screw thread is also known as core or root diameter.

A. Yes
B. No

Answer: Option B

Explanation:

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2. 

The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where d = Nominal diameter of bolt in mm)

A. 1420 d
B. 1680 d
C. 2080 d
D. 2840 d

Answer: Option D

Explanation:

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3. 

The property of a material which enables it to be drawn into wires with the application of a tensile force, is called

A. plasticity
B. elasticity
C. ductility
D. malleability

Answer: Option C

Explanation:

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4. 

The helix angle for single helical gears ranges from

A. 10° to 15°
B. 15° to 20°
C. 20° to 35°
D. 35° to 50°

Answer: Option C

Explanation:

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5. 

In order to withstand resistance to wear, the best profile of gear is

A. full depth involute tooth
B. 20° full depth involute tooth
C. 20° involute stub tooth
D. stub tooth

Answer: Option A

Explanation:

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