Power Plant Engineering Mock Test 3

10%

Question 1 of 10

1. Back pressure turbines are usually _________________ with respect to their power output.

very small

large

small

very large

Question 1 of 10

Question 2 of 10

2. Regenerative heating i.e., bleeding steam to reheat feed water to boiler ___________

decreases thermal efficiency of the cycle

does not affect thermal efficiency of the cycle

may increase or decrease thermal efficiency of the cycle depending upon the point of extraction of steam

increases thermal efficiency of the cycle

Question 2 of 10

Question 3 of 10

3. Which of these is not considered economical for cogeneration?

a high fraction of electric to total energy

a low fraction of electric to total energy

a low fraction of total energy to electric energy

none of the mentioned

Question 3 of 10

Question 4 of 10

4. Gross cycle heat rate is equal to?

(heat rejected / turbine output)

(rate of heat rejection / turbine input)

none of the mentioned

(rate of heat addition / turbine output)

Question 4 of 10

Question 5 of 10

5. Which of the following parameters affects the fuel economy?

heat consumption

specific heat

heat constant

heat rate

Question 5 of 10

Question 6 of 10

6. Where is the deaerator placed in the feedwater system?

there is no deaerator in the feedwater system

at the end

in the middle

in the beginning

Question 6 of 10

Question 7 of 10

7. The engines which are operating on gas power cycle are?

either cyclic or non-cyclic

cyclic

none of the mentioned

non-cyclic

Question 7 of 10

Question 8 of 10

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

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

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

Question 8 of 10

Question 9 of 10

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

change of entropy between inlet and outlet

change of internal energy between inlet and outlet

change of enthalpy between inlet and outlet

change of temperature between inlet and outlet

Question 9 of 10

Question 10 of 10

10. The cogeneration plant efficiency n_CO if W_T, Q_i, Q_H represents turbine work, heat input, heat output respectively is given by?

n_CO = (W_T + Q_H) / Q_i

n_CO = (W_T - Q_i) / Q_H

n_CO = (W_T + Q_i) / Q_H

n_CO = (W_T + Q_H) / Q_i

Question 10 of 10