IC Engines

JKSSB Junior Engineer (Mechanical) · Technical Subjects (Mechanical) · 16 practice questions with answers and explanations: 9 Easy, 7 Medium, 0 Hard.

Sample questions

Sample Easy question 1

The flywheel of an engine is used to:

  1. Reduce fluctuation of speed during a cycle
  2. Cool the cylinder
  3. Increase fuel supply
  4. Lubricate the crankshaft
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Answer: A. It stores energy during the power stroke and releases it during the others.

Sample Easy question 2

The function of a governor is to:

  1. Control exhaust gases
  2. Keep the mean speed constant under varying load
  3. Start the engine
  4. Reduce the speed fluctuation within a cycle
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Answer: B. A flywheel handles variation within a cycle, while a governor handles variation with load.

Sample Easy question 3

Which part of an engine converts reciprocating motion to rotary motion?

  1. Valve spring
  2. Connecting rod and crankshaft
  3. Piston ring
  4. Camshaft
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Answer: B. The connecting rod joins the piston to the crank.

Sample Medium question 4

Mechanical efficiency of an engine is:

  1. Indicated power divided by brake power
  2. Brake power divided by indicated power
  3. Brake power divided by fuel energy
  4. Swept volume divided by clearance volume
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Answer: B. The difference between the two is friction power.

Sample Medium question 5

In a two-stroke engine, a power stroke occurs once every:

  1. Four revolutions
  2. Two revolutions
  3. Revolution of the crankshaft
  4. Half revolution
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Answer: C. A two-stroke cycle is completed in one revolution.

Sample Medium question 6

Turbocharging increases engine power by:

  1. Supplying air at higher pressure and density
  2. Increasing the compression ratio only
  3. Cooling the exhaust
  4. Reducing friction
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Answer: A. More air allows more fuel to be burnt per cycle.

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