Diesel Generator MCQs

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Electrical Engineering XYZ MCQs

The rotor of diesel engine alternator is

The rotor of diesel engine alternator is:

  1. Salient type
  2. Non-salient type

Correct answer: 1. Salient type

Explanation: The rotor of a diesel engine alternator is typically of the non-salient type. Non-salient pole rotors, also known as cylindrical rotors, are used in alternators with higher speed and smaller diameter, as found in most diesel engine setups. These rotors have a smooth cylindrical shape, which allows for higher rotational speeds without excessive air resistance, making them ideal for engines that operate at high RPMs like those in diesel engines. Non-salient rotors also provide better mechanical stability and less vibration at these higher speeds.

The quality of diesel engine fuel is rated in terms of

The quality of diesel engine fuel is rated in terms of:

  1. Octane number
  2. Cetane number
  3. Bondage number
  4. None of these

Correct answer: 2. Cetane number

Lubrication is done to

Lubrication is done to:

  1. Reduce wear and tear
  2. Reduce losses due to friction
  3. To improve efficiency
  4. All of these

Correct answer: 4. All of these

Which one of the following is high-quality fuel

Which one of the following is high-quality fuel:

  1. Fuel having cetane number of 20
  2. Fuel having CN of 10
  3. Fuel having CN of 49
  4. Fuel having CN 3.33

Correct answer: 3. Fuel having CN of 4

The statement: Size of diesel engine increases with the increase of cutoff ratio. is:

  1. Wrong
  2. Correct
  3. Partially correct
  4. Size of the engine has nothing to do with the cutoff ratio

Correct answer: 1. Wrong

Explanation: Size of engine increases with the decrease of cutoff ratio.

The essential features of diesel engine exhaust system

g. The essential features of diesel engine exhaust system:

  1. Isolation of vibrations
  2. Less noisy
  3. Reduction of air pollution
  4. All of these
  5. None of these

Correct answer: 4. All of these

The part of diesel engine which required lubrication

h. The part of diesel engine which required lubrication:

  1. Gears
  2. Piston
  3. Connecting rod
  4. Bearings
  5. All of these

Correct answer: 5. All of these

Usually, diesel engine alternator poles are of

i. Usually, diesel engine alternator poles are of:

  1. Salient type
  2. Nonsalient type
  3. Both are possible
  4. The alternator is not used with diesel engine

Correct answer: 1. Salient type

Air contains the percentage of nitrogen

d. Air contains the percentage of nitrogen:

  1. 11%
  2. 21%
  3. 61%
  4. 79%

Correct answer: 2. 21%

Cetane is

e. Cetane is:

  1. Hexadecane
  2. Dodecane
  3. Tetradecane
  4. Decane

Correct answer: 1. Hexadecane

The formula of cetane is

d. The formula of cetane is:

  1. C7H16
  2. C16H34
  3. C12H26
  4. C17H36

Correct answer: 2. C16H34

Higher cetane fuels have

e. Higher cetane fuels have:

  1. Longer ignition delay
  2. Shorter ignition delay

Correct answer: 2. Shorter ignition delay

Air required by diesel power plant per kWh

f. Air required by diesel power plant per kWh:

  1. 1 to 4 m3
  2. 4 to 8 m3
  3. 8 to 12 m3
  4. 12 to 24 m3

Correct answer: 2. 4 to 8 m3

Main component of natural gas is

Main component of natural gas is:

  1. Methane
  2. Ethane
  3. Nitrogen
  4. Oxygen

Correct answer: 1. Methane

The mechanical injection system of modern diesel engines delivers the fuel at a pressure of:

  1. 100 kg/cm2
  2. 200 kg/cm2
  3. 300 kg/cm2
  4. 400 kg/cm2
  5. 500 kg/cm2

Correct answer: 1. 100 kg/cm2

The diesel engine which develops more power for same speed:

  1. Two stroke
  2. Four Stroke

Correct answer: 2. Four stroke

See More MCQs on Power Generation

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