Theory Of Machine MCQ Questions & Answers

1

In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The minimum length of the coupler will be

A) 45 mm B) Slightly less than 45 mm C) Slightly more than 45 mm D) 95 mm

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Answer & Solution

Answer: Option C

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2

The natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft and $$I$$ = Mass moment of inertia of the disc attached at the end of a shaft)

A) $$2\pi \sqrt {\frac{{\text{q}}}{I}} $$ B) $$2\pi \sqrt {{\text{q}}I} $$ C) $$\frac{1}{{2\pi }}\sqrt {\frac{{\text{q}}}{I}} $$ D) $$\frac{1}{{2\pi }}$$

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Answer & Solution

Answer: Option C

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3

The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, $$\omega $$ = Angular speed of crank, r = Radius of crank and $$\theta $$ = Angle of inclination of crank to the line of stroke)

A) $${\text{m}}{\omega ^2}{\text{r}}\cos \theta $$ B) $${\text{cm}}{\omega ^2}{\text{r}}\sin \theta $$ C) $$\left( {1 - {\text{c}}} \right){\text{m}}{\omega ^2}{\text{r}}\left( {\cos \theta - \sin \theta } \right)$$ D) $${\text{m}}{\omega ^2}{\text{r}}\left( {\cos \theta - \sin \theta } \right)$$

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Answer & Solution

Answer: Option C

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4

When the primary direct crank of a reciprocating engine makes an angle of $$\theta $$ with the line of stroke, then the secondary direct crank will make an angle of _________ with the line of stroke.

A) $$\frac{\theta }{2}$$ B) $$\theta $$ C) $$2\theta $$ D) $$4\theta $$

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Answer & Solution

Answer: Option C

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5

The lower pair is a

A) Open pair B) Closed pair C) Sliding pair D) Point contact pair

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Answer & Solution

Answer: Option B

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6

The purpose of a link is to

A) Transmit motion B) Guide other links C) Act as a support D) All of the above

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Answer & Solution

Answer: Option D

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7

In Meyer's expansion valve, the expansion valve is driven by an eccentric having an angle of advance from

A) 50° - 60° B) 60° - 70° C) 70° - 80° D) 80° - 90°

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Answer & Solution

Answer: Option D

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8

In Meyer's expansion valve, the main valve is driven by an eccentric having an angle of advance from

A) 10° - 15° B) 15° - 25° C) 25° - 30° D) 30° - 40°

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Answer & Solution

Answer: Option C

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9

The angle of inclination of the plane, at which the body begins to move down the plane is called

A) Angle of friction B) Angle of repose C) Angle of projection D) None of these

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Answer & Solution

Answer: Option B

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10

The radial distance of a tooth from the pitch circle to the bottom of the tooth is called

A) Dedendum B) Addendum C) Clearance D) Working depth

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Answer & Solution

Answer: Option A

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Theory Of Machine MCQ Questions & Answers | Mechanical Engineering