Theory of Machines

JKSSB Junior Engineer (Mechanical) · Technical Subjects (Mechanical) · 15 practice questions with answers and explanations: 4 Easy, 11 Medium, 0 Hard.

Sample questions

Sample Easy question 1

The device used to join two shafts that can be disengaged while running is a:

  1. Bearing
  2. Clutch
  3. Coupling
  4. Key
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Answer: B. A coupling joins shafts permanently, while a clutch can be engaged and disengaged.

Sample Easy question 2

A kinematic pair in which the relative motion is completely constrained is called:

  1. A free pair
  2. A higher pair
  3. An open pair
  4. A closed pair
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Answer: D. Closed pairs are held together by their own form or by external forces.

Sample Easy question 3

A cam and follower is an example of a:

  1. Turning pair
  2. Sliding pair
  3. Lower pair
  4. Higher pair
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Answer: D. The contact is along a line or point rather than a surface.

Sample Medium question 4

In a gear train, an idler gear changes the:

  1. Torque ratio
  2. Number of teeth
  3. Speed ratio
  4. Direction of rotation of the driven gear
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Answer: D. It has no effect on the overall gear ratio.

Sample Medium question 5

A flywheel's function is to:

  1. Convert linear to rotary motion
  2. Reduce friction
  3. Smooth out speed fluctuations by storing kinetic energy
  4. Maintain a constant mean speed
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Answer: C. A governor, not a flywheel, controls the mean speed.

Sample Medium question 6

In a Watt governor, the height of the governor is inversely proportional to:

  1. The speed
  2. The mass of the ball
  3. The cube of the speed
  4. The square of the speed
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Answer: D. h = g / ω².

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