Machine Design MCQ Questions & Answers

71

Aircraft body is usually fabricated by

A) Welding B) Pre-casting C) Riveting D) Casting

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Answer & Solution

Answer: Option C

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72

The property of a material which enables it to resist fracture due to high impact loads is known as

A) Elasticity B) Endurance C) Strength D) Toughness

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Answer & Solution

Answer: Option D

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73

A self locking screw has

A) Fine threads B) Course threads C) Coefficient of friction is greater than tangent of load angle D) Hole for inserting split pin

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Answer & Solution

Answer: Option C

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74

A hollow saddle key is

A) A taper key which fits half in the key way of hub and half in the key way of shaft B) A taper key which fits in a key way of the hub and is flat on the shaft C) A taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft D) Provided in pairs at right angles and each key is to withstand torsion in one direction only

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Answer & Solution

Answer: Option C

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75

When spring index increases, the value of Wahl's stress factor

A) Increases linearly B) Decreases linearly C) Remains same D) Increases exponentially

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Answer & Solution

Answer: Option D

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76

The stress in the bar when the load is applied suddenly is __________ as compared to the stress induced due to gradually applied loads.

A) Same B) Double C) Three times D) Four times

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Answer & Solution

Answer: Option B

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77

The shear stress in a beam varies from zero at the outer fibers to a maximum at the ________.

A) Neutral surface B) Upper surface C) Lower surface D) None of these

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Answer & Solution

Answer: Option A

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78

Three different weights fall from a certain height under vacuum. They will take

A) Same time to reach earth B) Times proportional to weight to reach earth C) Times inversely proportional to weight to reach earth D) None of the above

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Answer & Solution

Answer: Option A

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79

Which of the following is a permanent fastening?

A) Bolts B) Keys C) Cotters D) Rivets

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Answer & Solution

Answer: Option D

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80

The helix angle for double helical gears may be made up to

A) 45° B) 60° C) 75° D) 90°

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Answer & Solution

Answer: Option A

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Machine Design MCQ Questions & Answers | Mechanical Engineering