Question 41 : The correct mixture strength (by weight) for petrol is about
1. 14.6:1
2. 22.6:1
3. 20.4:1
4. 18.5:1
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Question 42 : In a four stroke cycle diesel engine, the exhaust valve
1. opens at bottom dead centre and closes at top dead centre
2. opens at 60° after top dead centre and closes at 10° before top dead centre
3. opens at 30° before bottom dead cnetre and closes at 10° after top dead centre
4. may open and close anywhere
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Question 43 : The thermodynamic cycle on which the petrol engine works, is
1. Otto cycle
2. Rankine cycle
3. Stirling cycle
4. Joule cycle
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Question 44 : The working pressure and temperature inside the cylinder of an internal combustion engine is __________ as compared to a steam engine.
1. very low
2. very high
3. high
4. low
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Question 45 : A moderator
1. absorbs neutrons
2. accelerates neutrons
3. does not absorb neutrons
4. none of these
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Question 46 : The inlet valve of a four stroke cycle internal combustion engine remains open for
1. 130°
2. 180°
3. 270°
4. 230°
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Question 47 : The advancing of spark timing in spark ignition engines will __________ knocking tendency.
1. none of these
2. reduce
3. increase
4. not effect
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Question 48 : The increase of efficiency of a compression ignition engine, as the load decreases, is due to
1. hit and miss governing
2. quantitative governing
3. qualitative governing
4. higher maximum temperature
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Question 49 : Morse test is used to determine the I.P. of a
1. four stroke engine
2. single cylinder diesel engine
3. single cylinder petrol engine
4. multi-cylinder engine
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Question 50 : The ratio of the brake power to the indicated power is called
1. indicated thermal efficiency
2. overall efficiency
3. volumetric efficiency
4. mechanical efficiency
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