Ideal Regenerative Vapour & Gas Power Cycle - MCQs with Answers

Ideal Regenerative Vapour & Gas Power Cycle - MCQs with Answers

Q1. The mean temperature of heat addition (T_m) in the Rankine cycle can be increased by

a. reheating the steam
b. increasing superheat
c. increasing pressure ratio between which the cycle works
d. all of the above

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Q2. In ideal regenerative cycle (saturated steam Rankine cycle), the heat addition takes place

a. from lowest temperature to highest temperature
b. at constant pressure
c. at constant temperature
d. none of the above

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Q3. What is the relation between efficiencies of the ideal regenerative Rankine cycle and the Carnot cycle?

a. the efficiency of ideal regenerative Rankine cycle is less than the efficiency of Carnot cycle
b. the efficiency of ideal regenerative Rankine cycle is more than the efficiency of Carnot cycle
c. the efficiency of ideal regenerative Rankine cycle is equal to the efficiency of Carnot cycle
d. none of the above

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Q4. What is the unique feature of regenerative cycle over Rankine cycle?

a. the steam leaving the high pressure turbine again heated and used to run low pressure turbine
b. the condensate leaving the pump recirculated around the turbine case
c. both a. and b.
d. none of the above

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Q5. The net work output of an ideal regenerative cycle is

a. more than the net work output of the Rankine cycle
b. less than the net work output of the Rankine cycle
c. equal to the net work output of the Rankine cycle
d. cannot say

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Q6. Which among the following has the lowest efficiency than the others, when they are operated between same pressures?

a. Ideal Rankine cycle
b. Ideal regenerative cycle
c. Carnot cycle
d. None. All of the above have same efficiency

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Q7. What is the reason behind the fact that the ideal regenerative cycle is practically not possible?

a. The reversible heat transfer takes infinite time
b. It is mechanically impossible to exchange heat in the turbine
c. The moisture content of the steam in the turbine will be high
d. All of the above

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Q8. How are the effect of reheat and effect of regeneration on the efficiency of steam power plant compared?

a. effect of reheat is greater that the effect of regeneration on plant efficiency
b. effect of regeneration is greater that the effect of reheat on plant efficiency
c. both the reheat and regeneration have same effect on efficiency of steam power plant
d. cannot say

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