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Applications Questions Set 3:

Quiz Mode

A four-stroke cycle engine should develop __________ power compared to a two-stroke cycle engine.

twice

half

four times

thrice

Solution:

For a four-stroke engine, how many times are the number of working strokes per minute the speed of the engine in R.P.M.?

half

twice

equal

four-times

Solution:

During the Vapor Compression Refrigeration (VCR) cycle, the highest temperature is achieved after which process?

Compression

Evaporation

Condensation

Expansion

Solution:

Find the value of the coefficient of performance (COP) of the heat pump if the COP of the refrigerator is 3.54 (operating under the same conditions).

4.54

5.54

3.95

2.54

Solution:

Which of the following statements is correct with respect to Pumps in Parallel (H = Total Head)?

None of the above

H = H1 + H2 + H3 + ...

1/H = 1/H1 + 1/H2 + ...

H = Constant

Solution:

In a vapor compression refrigeration (VCR) system, what is the effect of using a flash chamber?

COP remains the same

COP decreases

Increases mass of refrigerant flowing through evaporator

COP increases

Solution:

Which of the following correctly describes the valve action in the 4-Stroke Cycle?

None of the above

Compression Stroke: Both valves closed

Expansion Stroke: One valve closed and one open

Suction Stroke: Valves overlap

Solution:

If the barometric pressure is 1.03 bar, the partial pressure of air is 1 bar, and the saturation partial pressure of water vapor at the same dry bulb temperature is 0.05 bar, what will be the relative humidity?

50%

60%

Solution:

The result of a reduction in operating pressure in the air refrigeration cycle is

an increase in the coefficient of performance (COP)

always a decrease

no change in the coefficient of performance (COP)

a decrease in the coefficient of performance (COP)

Solution:

We have been given a steam power plant with the following efficiencies:

- Boiler efficiency: 90%

- Turbine efficiency: 95%

- Generator efficiency: 96%

- Cycle efficiency: 46%

There is 7% of the generated power that is used to run the auxiliaries. Calculate the overall efficiency of the steam power plant.

42%

35%

32%

39%

Applications Questions Set 3:

A four-stroke cycle engine should develop __________ power compared to a two-stroke cycle engine.

Solution:

For a four-stroke engine, how many times are the number of working strokes per minute the speed of the engine in R.P.M.?

Solution:

During the Vapor Compression Refrigeration (VCR) cycle, the highest temperature is achieved after which process?

Solution:

Find the value of the coefficient of performance (COP) of the heat pump if the COP of the refrigerator is 3.54 (operating under the same conditions).

Solution:

Which of the following statements is correct with respect to Pumps in Parallel (H = Total Head)?

Solution:

In a vapor compression refrigeration (VCR) system, what is the effect of using a flash chamber?

Solution:

Which of the following correctly describes the valve action in the 4-Stroke Cycle?

Solution:

If the barometric pressure is 1.03 bar, the partial pressure of air is 1 bar, and the saturation partial pressure of water vapor at the same dry bulb temperature is 0.05 bar, what will be the relative humidity?

Solution:

The result of a reduction in operating pressure in the air refrigeration cycle is

Solution:

Solution:

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