Theory Of Machine MCQ Questions & Answers

1

The condition for correct steering of a Davis steering gear is (where $$\alpha = $$ Angle of inclination of the links to the vertical)

A) $$\sin \alpha = \frac{{\text{b}}}{{\text{c}}}$$ B) $$\cos \alpha = \frac{{\text{c}}}{{\text{b}}}$$ C) $$\tan \alpha = \frac{{\text{c}}}{{2{\text{b}}}}$$ D) $$\cot \alpha = \frac{{\text{c}}}{{2{\text{b}}}}$$

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Answer & Solution

Answer: Option C

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2

The frictional torque transmitted in a conical pivot bearing with assumption of uniform pressure is __________ as compared to uniform wear.

A) Less B) More C) Same D) None of these

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Answer & Solution

Answer: Option B

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3

The frictional torque transmitted in a flat pivot bearing with assumption of uniform pressure is _________ as compared to uniform wear.

A) Less B) More C) Same D) None of these

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Answer & Solution

Answer: Option B

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4

The frictional torque transmitted in a conical pivot bearing, considering uniform wear, is

A) $$\frac{1}{2}\mu {\text{WRcosec}}\alpha $$ B) $$\frac{2}{3}\mu {\text{WRcosec}}\alpha $$ C) $$\frac{3}{4}\mu {\text{WRcosec}}\alpha $$ D) $$\mu {\text{WRcosec}}\alpha $$

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Answer & Solution

Answer: Option A

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5

The frictional torque transmitted in a truncated conical pivot bearing, considering uniform wear, is

A) $$\frac{1}{2}\mu {\text{Wcosec}}\alpha \left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)$$ B) $$\frac{2}{3}\mu {\text{Wcosec}}\alpha \left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)$$ C) $$\frac{1}{2}\mu {\text{Wcosec}}\alpha \left( {\frac{{{\text{r}}_1^3 - {\text{r}}_2^3}}{{{\text{r}}_1^2 - {\text{r}}_2^2}}} \right)$$ D) $$\frac{2}{3}\mu {\text{Wcosec}}\alpha \left( {\frac{{{\text{r}}_1^3 - {\text{r}}_2^3}}{{{\text{r}}_1^2 - {\text{r}}_2^2}}} \right)$$

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Answer & Solution

Answer: Option A

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6

Bifilar suspension method is used to find the

A) Angular acceleration of the body B) Moment of inertia of the body C) Periodic time of the body D) Frequency of vibration of the body

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Answer & Solution

Answer: Option B

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7

Scotch yoke mechanism is used to generate

A) Sine functions B) Square roots C) Logarithms D) Inversions

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Answer & Solution

Answer: Option A

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8

V-belts are usually used for

A) Long drives B) Short drives C) Long and short drives D) None of these

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Answer & Solution

Answer: Option B

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9

ABCD is a four bar mechanism in which AB = 310 mm and CD = 450 mm. AB and CD are both perpendicular to the fixed link AD, as shown in the below figure. If the velocity of B at this condition is v. Then the velocity of C is
Theory of Machine mcq question image

A) $$\frac{1}{3}$$ v B) $$\frac{2}{3}$$ v C) $$\frac{3}{2}$$ v D) $$\frac{9}{4}$$ v

Discuss

Answer & Solution

Answer: Option C

Solution:

10

A body is said to be under forced vibrations, when

A) There is a reduction in amplitude after every cycle of vibration B) No external force acts on a body, after giving it an initial displacement C) A body vibrates under the influence of external force D) None of the above

Discuss

Answer & Solution

Answer: Option C

Solution:

Forced vibrations occur when a body is made to vibrate by the continuous action of an external periodic force.

In this case, the vibration is maintained by the applied external force rather than by the body’s own natural tendency to vibrate.

Option A describes damped vibrations, where amplitude decreases after each cycle due to energy loss.

Option B refers to free vibrations, where no external force acts after the initial displacement.

Therefore, a body is said to be under forced vibrations when it vibrates under the influence of an external force, making Option C the correct answer.

Theory Of Machine MCQ Questions & Answers | Mechanical Engineering