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

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

1. The reference fuels for knock rating of spark ignition engines would include __________
a) normal octane and aniline
b) iso-octane and normal hexane
c) iso-octane and alpha-methyl naphthalene
d) normal heptane and iso-octane
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2. What is the purpose of testing an internal combustion engine?
a) to conform the data used in design, the validity of which may be doubtful
b) to satisfy the customer regarding the performance of the engine
c) to determine the information, which cannot be obtained by calculations
d) all of the mentioned
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3. Pre-ignition is caused by the spontaneous combustion of the mixture before the end of the compression stroke, and is due to __________
a) overheated spark plug points
b) red hot carbon deposits on cylinder walls
c) cylinder walls being too hot
d) any of the mentioned
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4. The thermal efficiency of a standard Otto cycle for a compression ratio of 5.5 will be __________
a) 20%
b) 25%
c) 50%
d) 55%
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5. The fuels in order of decreasing knock tendency for spark ignition engines are __________
a) Paraffin, aromatic, napthene
b) Paraffin, napthene, aromatic
c) Napthene, aromatics, paraffin
d) Napthene, paraffin, aromatic
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6. In a four stroke cycle petrol engine, the pressure inside the engine cylinder during the suction stroke is __________ the atmospheric pressure.
a) equal to
b) below
c) above
d) middle
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7. Solid fuel fabricated into various small shapes, which are assembled to form fuel elements, is in the form of __________
a) pallets
b) plates
c) pins
d) all of the mentioned
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8. A diesel engine is __________ as compared to petrol engine, both running at rated load.
a) equally efficient
b) more efficient
c) less efficient
d) all of the mentioned
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9. A higher compression ratio causes __________
a) increase in detonation
b) pre-ignition
c) an acceleration in the rate of combustion
d) any one of the mentioned
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10. Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?
a) inlet valve closing before bottom dead centre
b) inlet valve closing after bottom dead centre
c) inlet valve opening before top dead centre
d) exhaust valve closing after top dead centre
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