Power Plant Engineering Mock Test 3

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Question 1 of 10

1. Name another chemical apart from Sodium Sulphite which is into the feedwater at the suction of the boiler feed pump?

Hydrazine

Hydroxide

Oxymes

Calcium peroxide

Question 1 of 10

Question 2 of 10

2. The mechanical efficiency of a turbine is given by? (n_tm denotes the mechanical efficiency)

n_tm = (brake output of the turbine / internal output of the turbine)

n_tm = (brake output of the turbine x internal output of the turbine)

n_tm = (brake output of the turbine - internal output of the turbine)

n_tm = (internal output of the turbine / break output of the turbine)

Question 2 of 10

Question 3 of 10

3. What is the effect of superheated steam on efficiency of Rankine cycle?

efficiency of Rankine cycle increases with increase in superheat of the steam

efficiency of Rankine cycle decreases with increase in superheat of the steam

efficiency of Rankine cycle is not affected by change in superheat of the steam

none of the mentioned

Question 3 of 10

Question 4 of 10

4. The relation between heat rate & efficiency is?

heat rate is also called efficiency

both are directly proportional

they are independent of each other

both are inversely proportional

Question 4 of 10

Question 5 of 10

5. In a regenerative feed heating cycle, the greatest economy is affected ___________

when steam is extracted from several places in different stages of steam turbine

when steam is extracted only from the last stage of steam turbine

when steam is extracted from only one suitable point of steam turbine

when steam is extracted only from the first stage of steam turbine

Question 5 of 10

Question 6 of 10

6. What is the solubility of dissolved gases at boiling or saturation temperature?

Positive

Zero

Negative

None of the mentioned

Question 6 of 10

Question 7 of 10

7. What is the relation of the mean temperature of heat addition and cycle efficiency?

none of the mentioned

both are independent of each other

both are inversely proportional

both are directly proportional

Question 7 of 10

Question 8 of 10

8. The heat exchanger after passing through which, the feedwater is sprayed from the top is called?

Vent condenser

Vent heater

Vent evaporator

Vent economiser

Question 8 of 10

Question 9 of 10

9. In Rankine cycle the work output from the turbine is given by ___________

change of enthalpy between inlet and outlet

change of entropy between inlet and outlet

change of temperature between inlet and outlet

change of internal energy between inlet and outlet

Question 9 of 10

Question 10 of 10

10. What do you mean by vent condenser?

a condensing unit

a temperature measuring instrument

dissolves oxygen

a heat exchanger

Question 10 of 10