Theory Of Machine MCQ Questions & Answers

71

Hammer blow

A) Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses. B) Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses C) Varies as the square root of the speed D) Varies inversely with the square of the speed

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Answer & Solution

Answer: Option B

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72

The instantaneous centers which vary with the configuration of mechanism are called

A) Permanent instantaneous centers B) Fixed instantaneous centers C) Neither fixed nor permanent instantaneous centers D) None of the above

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Answer & Solution

Answer: Option C

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73

In a radial cam, the follower moves

A) In a direction perpendicular to the cam axis B) In a direction parallel to the cam axis C) In any direction irrespective of the cam axis D) Along the cam axis

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Answer & Solution

Answer: Option A

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74

When the sleeve of a Porter governor moves downwards, the governor speed

A) Increases B) Decreases C) Remain unaffected D) First increases and then decreases

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Answer & Solution

Answer: Option B

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75

When the sleeve of a Porter governor moves upwards, the governor speed

A) Increases B) Decreases C) Remain unaffected D) First increases and then decreases

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Answer & Solution

Answer: Option A

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76

The acceleration of the particle moving with simple harmonic motion is _________ at the mean position.

A) Zero B) Minimum C) Maximum D) None of these

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Answer & Solution

Answer: Option A

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77

The velocity of a body moving with simple harmonic motion is __________ at the mean position.

A) Zero B) Minimum C) Maximum D) None of these

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Answer & Solution

Answer: Option C

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78

When the crank is at the inner dead center, in a reciprocating steam engine, then the acceleration of the piston will be

A) $${\omega ^2}{\text{r}} \times \frac{{{\text{n}} + 1}}{{\text{n}}}$$ B) $${\omega ^2}{\text{r}} \times \frac{{{\text{n}} - 1}}{{\text{n}}}$$ C) $${\omega ^2}{\text{r}} \times \frac{{\text{n}}}{{{\text{n}} + 1}}$$ D) $${\omega ^2}{\text{r}} \times \frac{{\text{n}}}{{{\text{n}} - 1}}$$

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Answer & Solution

Answer: Option A

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79

When the crank is at the inner dead centre, in a reciprocating steam engine, then the velocity of the piston will be

A) Minimum B) Zero C) Maximum D) None of these

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Answer & Solution

Answer: Option B

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80

When the crank is at the outer dead centre, in a reciprocating steam engine, then the acceleration of the piston will be

A) $${\omega ^2}{\text{r}} \times \frac{{{\text{n}} + 1}}{{\text{n}}}$$ B) $${\omega ^2}{\text{r}} \times \frac{{{\text{n}} - 1}}{{\text{n}}}$$ C) $${\omega ^2}{\text{r}} \times \frac{{\text{n}}}{{{\text{n}} + 1}}$$ D) $${\omega ^2}{\text{r}} \times \frac{{\text{n}}}{{{\text{n}} - 1}}$$

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Answer & Solution

Answer: Option B

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Theory Of Machine MCQ Questions & Answers | Mechanical Engineering