Power Plant Questions and Answers – Diesel Engine Types and their Applications – I

This set of Power Plant Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Diesel Engine Types and their Applications – I”.

1. Nuclear Reactors are used __________
a) to produce heat for thermoelectric power
b) to propel ships, submarines, aircrafts
c) to produce fissionable material
d) all of the mentioned
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2. Where reactor operation is designed with fast neutrons such as in reactors using highly enriched fuel, the moderator used is?
a) Carbon dioxide
b) Heavy Water
c) Graphite
d) No moderator is needed
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3. The expansion of fuel in a four stroke cycle diesel engine __________
a) starts at 15° after top dead centre and ends at 30° before bottom dead centre
b) starts at top dead centre and ends at 30° after top dead centre
c) may start and end anywhere
d) starts at 15° before top dead centre and ends at 30° after top dead centre
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4. A moderator, in nuclear power plants, is a medium introduced into the fuel mass in order to __________
a) slow down the speed of fast moving neutrons
b) control the reaction
c) reduce the temperature
d) extract heat from nuclear reaction
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5. The thermal efficiency of diesel engines is about __________
a) 30%
b) 15%
c) 50%
d) 70%
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6. In a four stroke cycle petrol engine, the charge is ignited at __________
a) 30° after bottom dead centre
b) 30° before bottom dead centre
c) 30° after top dead centre
d) 30° before top dead centre
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7. The exhaust valve in a four stroke cycle petrol engine __________
a) opens at 50° after bottom dead centre and closes at 15° before top dead centre
b) opens at 50° before bottom dead centre and closes at 15° after top dead centre
c) opens at bottom dead centre and closes at top dead centre
d) may open and close anywhere
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8. The brake power of a diesel engine, keeping other parameters constant, can be increased by __________
a) increasing the pressure of intake air
b) decreasing the density of intake air
c) decreasing the pressure of intake air
d) increasing the temperature of intake air
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9. In a four stroke cycle, the minimum temperature inside the engine cylinder occurs at the __________
a) end of suction stroke
b) beginning of exhaust stroke
c) beginning of suction stroke
d) end of exhaust stroke
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10. The effective inhibitor of pre-ignition is __________
a) alcohol
b) lead
c) water
d) none of the mentioned
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