Theory Of Machine MCQ Questions & Answers

1

A mass of 1 kg is attached to the end of a spring with a stiffness of 0.7 N/mm. The critical damping coefficient of this system is

A) 1.4 N-s/m B) 18.52 N-s/m C) 52.92 N-s/m D) 529.2 N-s/m

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Answer & Solution

Answer: Option C

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2

The Hooke's joint consists of:

A) Two forks B) One fork C) Three forks D) Four forks

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Answer & Solution

Answer: Option A

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3

In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done

A) Because of difficulty in manufacturing cam profile B) Because of loose contact of follower with cam surface C) In order to have acceleration in beginning and retardation at the end of stroke within the finite limits D) Because the uniform velocity motion is a partial parabolic motion

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Answer & Solution

Answer: Option C

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4

The relation between the controlling force (F_c) and radius of rotation (r) for a stable spring controlled governor is

A) F_c = ar + b B) F_c = ar - b C) F_c = ar D) $${{\text{F}}_{\text{c}}} = \frac{{\text{a}}}{{\text{r}}} + {\text{b}}$$

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Answer & Solution

Answer: Option B

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5

The velocity of a particle moving with simple harmonic motion, at any instant is given by (where $$\omega $$ = Displacement of the particle from mean position)

A) $$\omega \sqrt {{{\text{x}}^2} - {{\text{r}}^2}} $$ B) $$\omega \sqrt {{{\text{r}}^2} - {{\text{x}}^2}} $$ C) $${\omega ^2}\sqrt {{{\text{x}}^2} - {{\text{r}}^2}} $$ D) $${\omega ^2}\sqrt {{{\text{r}}^2} - {{\text{x}}^2}} $$

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Answer & Solution

Answer: Option B

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6

The partial balancing of reciprocating parts in locomotives produces

A) Hammer blow B) Swaying couple C) Variation in tractive force along the line of stroke D) All of the above

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Answer & Solution

Answer: Option D

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7

The acceleration of a particle at any instant has two components i.e. radial component and tangential component. These two components will be

A) Parallel to each other B) Perpendicular to each other C) Inclined at 45° D) Opposite to each other

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Answer & Solution

Answer: Option B

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8

An exact straight line motion mechanism is a

A) Scott-Russell's mechanism B) Hart's mechanism C) Peaucellier's mechanism D) All of these

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Answer & Solution

Answer: Option D

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9

In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links

A) Will remain same B) Will change C) Could change or remain unaltered depending on which link is fixed D) Will not occur

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Answer & Solution

Answer: Option A

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10

In a Hartnell governor, the stiffness of the spring is given by (where S₁ and S₂ = Spring forces exerted on the sleeve at max. and min. radii of rotation and h = Compression of the spring)

A) $$\frac{{{{\text{S}}_1} + {{\text{S}}_2}}}{{\text{h}}}$$ B) $$\frac{{{{\text{S}}_1} - {{\text{S}}_2}}}{{\text{h}}}$$ C) $$\frac{{{{\text{S}}_1} + {{\text{S}}_2}}}{{{\text{2h}}}}$$ D) $$\frac{{{{\text{S}}_1} - {{\text{S}}_2}}}{{{\text{2h}}}}$$

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Answer & Solution

Answer: Option B

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Theory Of Machine MCQ Questions & Answers | Mechanical Engineering