Question 21 : A heat engine converts heat energy from fuel combustion or any other source into which type of work
1. Electrical work
2. Mechanical work
3. Pressure work
4. None of the mentioned
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Question 22 : In two-stroke cycle engines, what replaces valves of a four-stroke engine
1. Fins
2. Notches
3. Ports
4. Tubes
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Question 23 : The entrance of the piston pin hole is sealed by
1. Steel plating
2. Snap ring
3. Rubber ring
4. None of the mentioned
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Question 24 : A gas undergoes isothermal compression in Carnot cycle. Which step does it undergo
1. 1st
2. 2nd
3. 3rd
4. 4th
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Question 25 : Engines used in tractors are
1. Single cylinder engines
2. Two cylinder engines
3. Four cylinder engines
4. Six cylinder engines
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Question 26 : Which of these is a power absorbing heat engine
1. Steam engine
2. Petrol engine
3. Air compressor
4. None of the mentioned
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Question 27 : A steam engine comes under the category of
1. External combustion engines
2. Internal combustion engines
3. All of the mentioned
4. None of the mentioned
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Question 28 : The pressure in an engine cylinder is less than atmospheric pressure when the engine is performing which stroke
1. Suction
2. Compression
3. Power
4. Exhaust
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Question 29 : The thickness of dry liners ranges from
1. 3 mm to 9mm
2. 1.5 mm to 3 mm
3. 1 mm to 2 mm
4. 0.5 mm to 2.5 mm
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Question 30 : A gas undergoes step 4 in Carnot cycle. Which of these processes describes the 2nd step
1. Isentropic expansion
2. Isentropic compression
3. Isothermal expansion
4. Isothermal compression
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