Theory Of Machine MCQ Questions & Answers

11

Which of the following is used to control the speed variations of the engine caused by the fluctuations of the engine turning moment?

A) D-slide valve B) Governor C) Flywheel D) Meyer's expansion valve

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Answer & Solution

Answer: Option C

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12

The displacement of the D-slide valve is __________ the steam lap by a distance known as lead of the valve.

A) Greater than B) Less than C) Equal to D) None of these

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Answer & Solution

Answer: Option A

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13

In which of the following type of gear train the first gear and the last gear are co-axial.

A) Simple gear train B) Compound gear train C) Reverted gear train D) None of the above

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Answer & Solution

Answer: Option C

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14

To obviate axial thrust, following gear drive is used

A) Double helical gears having opposite teeth B) Double helical gears having identical teeth C) Single helical gear in which one of the teeth of helix angle a is more D) Mutter gears

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Answer & Solution

Answer: Option A

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15

A point on a connecting link (excluding end points) of a double slider crank mechanism traces a

A) Straight line path B) Hyperbolic path C) Parabolic path D) Elliptical path

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Answer & Solution

Answer: Option D

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16

The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because

A) Whole of the mechanism in the Ackerman steering gear is on the back of the front wheels B) The Ackerman steering gear consists of turning pairs C) The Ackerman steering gear is most economical D) Both (A) and (B)

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Answer & Solution

Answer: Option D

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17

Maximum fluctuation of energy in a flywheel is equal to [where $$I$$ = Mass moment of inertia of the flywheel, E = Maximum fluctuation of energy, C_S = Coefficient of fluctuation of speed and $$\omega $$ = Mean angular speed = $$\frac{{{\omega _1} + {\omega _2}}}{2}$$ ]

A) $$I\omega \left( {{\omega _1} - {\omega _2}} \right)$$ B) $$I{\omega ^2}{{\text{C}}_{\text{S}}}$$ C) $${\text{2E}}{{\text{C}}_{\text{S}}}$$ D) All of these

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Answer & Solution

Answer: Option D

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18

The gear train usually employed in clocks is a

A) Simple gear train B) Reverted gear train C) Sun and planet gear D) Differential gear

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Answer & Solution

Answer: Option B

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19

The method of direct and reverse cranks is used in engines for

A) The control of speed fluctuations B) Balancing of forces and couples C) Kinematic analysis D) Vibration analysis

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Answer & Solution

Answer: Option B

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20

Rectilinear motion of piston is converted into rotary by

A) Cross head B) Slider crank C) Connecting rod D) Gudgeon pin

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Answer & Solution

Answer: Option B

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Theory Of Machine MCQ Questions & Answers | Mechanical Engineering