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RRB/SSC JE Mech: IC Engine & RAC Quiz 3

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Question 1

Which of the following remarks pertaining to supercharging of IC engines are correct?
1) Ideal supercharging increases the output, but decreases the thermal efficiency slightly.
2) The indicated mean effective pressure and mechanical efficiency increase with supercharging.
3) The permissible amount of supercharging depends on the compression ratio, air-fuel mixture and design of engine.
4) Engine friction losses increases with supercharging.

Question 2

Which of the following statements are true:
I. When the load on any power engine cycle is increased, the efficiency will increase.
II. The ratio of compression ratio of a diesel cycle and an otto cycle is 4.

Question 3

200 kg of apples are supplied to a cold storage at 22^oC. The cold storage is maintained at -5^oC and the apples get cooled to the storage temperature in 8 hours. The latent heat of freezing is 105 KJ/Kg and specific heat of apple is 1.25 KJ/KgK. The refrigeration capacity of the plant is

Question 4

A refrigerator based on reversed Carnot cycle works between two such temperatures that the ratio between the low and high temperature is 0.8. If a heat pump is operated between same temperature range, then what would be its COP?

Question 5

A heat pump works on a reversed Carnot cycle. The temperature in the condenser coils is 27^oC and that in the evaporator coils is -23^oC. For a work input of 1 kW, how much is the heat pumped?

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ESE & GATE ME Thermodynamics Internal Combustion Engine

Feb 16ESE & GATE ME