Power Plant MCQ With Answers Part 2 | Electrical MCQ

11. Compounding of steam turbine is done for
(a) reducing the work done
(b) increasing the rotor speed
(c) reducing the rotor speed
(d) balancing the turbine

Answer & Solution

Answer: (c) reducing the rotor speed

Solution:
NA

12. Thorium Breeder Reactors are most suitable for India because
(a) these develop more power
(b) its technology is simple
(c) abundance of thorium deposits are available in India
(d) these can be easily designed

Answer & Solution

Answer: (c) abundance of thorium deposits are available in India

Solution:
NA

13. The overall efficiency of thermal power plant is equal to
(a) Rankine cycle efficiency
(b) Carnot cycle efficiency
(c) Regenerative cycle efficiency
(d) Boiler efficiency x turbine efficiency x generator efficiency

Answer & Solution

Answer: (c) Regenerative cycle efficiency

Solution:
NA

14. Rankine cycle efficiency of a good steam power plant may be in the range of
(a) 15 to 20 per cent
(6) 35 to 45 per cent
(c) 70 to 80 per cent
(d) 90 to 95 per ceut

Answer & Solution

Answer: (6) 35 to 45 per cent

Solution:
NA

15. Rankine cycle operating on low pressure limit of p1 and high pressure limit of p2
(a) has higher the renal efficiency than the carnot cycle operating between same pressure limits
(b) has lower the”nal efficiency than carnot cycle operating between same pressure limit?
(c) has same thermal efficiency as carnot cycle operating between same pressure limits
(d) may be more or less depending upon the magnitude of p1 and p2

Answer & Solution

Answer: (a) has higher the renal efficiency than the carnot cycle operating between same pressure limits

Solution:
NA

16. Rankine efficiency of a steam power plant
(a) improves in summer as compared to that in winter
(6) improves in winter as compared to that in summer
(c) is unaffected by climatic conditions
(d) none of the above

Answer & Solution

Answer: (6) improves in winter as compared to that in summer

Solution:
NA

17. Carnot cycle comprises of
(a) two isentropic processes and two constant volume processes
(b) two isentropic processes and two constant pressure processes
(e) two isothermal processes and three constant pressure processes
(d) none of the above

Answer & Solution

Answer: (b) two isentropic processes and two constant pressure processes

Solution:
NA

18. In Rankine cycle the work output from the turbine is given by
(a) change of internal energy between inlet and outlet
(b) change of enthaply between inlet and outlet
(c) change of entropy between inlet and outlet
(d) change of temperature between inlet and outlet

Answer & Solution

Answer: (b) change of enthaply between inlet and outlet

Solution:
NA

19. Regenerative cycle thermal efficiency
(a) is always greater than simple Rankine thermal efficiency
(b) is greater than simple Rankine cycle thermal efficiency only when steam is bled at particular pressure
(c) is same as simple Rankine cycle thermal efficiency
(d) is always less than simple Rankine cycle thermal efficiency

Answer & Solution

Answer: (a) is always greater than simple Rankine thermal efficiency

Solution:
NA

20. In a regenerative feed heating cycle, the optimum value of the fraction of steam extracted for feed heating
(a) decreases with increase in Rankine cycle efficiency
(b) increases with increase in Rankine cycle efficiency
(c) is unaffected by increase in Rankine cycle efficiency
(d) none of the above

Answer & Solution

Answer: (b) increases with increase in Rankine cycle efficiency

Solution:
NA