Power Plant Engineering Objective Questions
1. The commercial sources of energy are
(a) solar, wind and biomass
(b) fossil fuels, hydropower and nuclear energy
(c) wood, animal wastes and agriculture wastes
(d) none of the above
Ans: b
2. 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
Ans: c
3. In India largest thermal power station is located at
(a) Kota
(b) Sarni
(c) Chandrapur
(d) Neyveli
Ans: c
4. The percentage O2 by Veight in atmospheric air is
(a) 18%
(b) 23%
(c) 77%
(d) 79%
Ans: b
5. The percentage 02 by volume in atmosphere air is
(a) 21%
(b) 23%
(c) 77%
(d) 79%
Ans: a
6. The proper indication of incomplete combustion is
(a) high CO content in flue gases at exit
(b) high CO2 content in flue gases at exit
(c) high temperature of flue gases
(d) the smoking exhaust from chimney
Ans: a
7. The main source of production of biogas is
(a) human waste
(b) wet cow dung
(c) wet livestock waste
(d) all above
Ans: d
8. India’s first nuclear power plant was installed at
(a) Tarapore
(b) Kota
(c) Kalpakkam
(d) none of the above
Ans: a
9. In fuel cell, the ______ energy is converted into electrical energy.
(a) mechanical
(b) chemical
(c) heat
(d) sound
Ans: b
10. Solar thermal power generation can be achieved by
(a) using focusing collector or heliostates
(b) using flat plate collectors
(c) using a solar pond
(d) any of the above system
Ans: d
11. The energy radiated by sun on a bright sunny day is approximately
(a) 700 W/m2
(b) 800 W/m2
(c) 1 kW/m2
(d) 2 kW/m2
Ans: c
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
Ans: c
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
Ans: c
14. Rankine cycle efficiency of a good steam power plant may be in the range of
(a) 15 to 20 percent
(6) 35 to 45 percent
(c) 70 to 80 percent
(d) 90 to 95 percent
Ans: b
15. Rankine cycle operating on low pressure limit of pi an 1 high pressure limit of p2
(a) has higher the rnal efficiency than the carnot cycie 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 ofpi and/>2
Ans: a
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
Ans: b
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
Ans: b
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
Ans: b
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
Ans: a
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
Ans: b
21. In a regenerative feed heating cycle, the greatest economy is affected
(a) when steam is extracted from only one suitable point of steam turbine
(b) when steam is extracted from several places in different stages of steam turbine
(c) when steam is extracted only from the last stage of steam turbine
(d) when steam is extracted only from the first stage of steam turbine
Ans: b
22. The maximum percentage gain in Regenerative feed heating cycle thermal efficiency
(a) increases with number of feed heaters increasing
(b) decreases with number of feed heaters increasing
(c) remains same unaffected by number of feed heaters
(d) none of the above
Ans: a
23. In regenerative cycle feed water is heated by
(a) exhaust gases
(b) heaters
(c) draining steam from the turbine
(d) all above
Ans: c
24. Reheat cycle in steam power plant is used to
(a) utilise heat of flue gases
(b) increase thermal efficiency
(c) improve condenser performance
(d) reduce loss of heat
Ans: b
25. Mercury is a choice with steam in binary vapour cycle because it has
(a) higher critical temperature and pressure
(b) higher saturation temperature than other fluids
(c) relatively low vapourisation pressure
(d) all above
Ans: d