Model Quiz Power Plant Engineering Questions Questions and Answers test2

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1. In case of impulse steam turbine _____.
there is enthalpy drop in fixed and moving blades	there is enthalpy drop only in moving blades
there is enthalpy drop in nozzles	none of the above

2. The pressure on the two sides of the impulse wheel of a steam turbine _____.
is same	is different
increases from one side to the other side	decreases from one side to the other side

3. In De Laval steam turbine ______.
the pressure in the turbine rotor is approximately same as in condenser	the pressure in the turbine rotor is higher than pressure in the condenser
the pressure in the turbine rotor gradually decreases from inlet to exit from condenser	none of the above

4. Incase of reaction steam turbine ______.
there is enthalpy drop both in fixed and moving blades	there is enthalpy drop only in fixed blades
there is enthalpy drop only in moving blades	none of the above

5. Curtis turbine is ______.
reaction steam turbine	pressure velocity compounded steam turbine
pressure compounded impulse steam turbme	velocity compounded impulse steam turbine

6. Rateau steam turbine is ______.
reaction steam turbine	velocity compounded impulse steam turbine
pressure compounded impulse steam turbine	pressure velocity compounded steam turbine

7. Parson's turbine is _______.
pressure compounded steam turbine	simple single wheel, impulse steam turbine
simple single wheel reaction steam turbine	multi wheel reaction steam turbine

8. For Parson's reaction steam turbine, degree of reaction is _____.
75%	100%
50%	60%

9. Reheat factor in steam turbines depends on _____.
exit pressure only	stage efficiency only
initial pressures and temperature only	all of the above

10. The value of reheat factor normally varies from _____.
0.5 to 0.6	0.9 to 0.95
1.02 to 1.06	1.2 to 1.6

11. Steam turbines are governed by the following methods ______.
Throttle governing	Nozzle control governing
By-pass governing	all of the above

12. In steam turbines the reheat factor ______.
increases with the increase in number of stages	decreases with the increase in number of stages
remains same irrespective of number of stages	none of the above

13. The thermal efficiency of the engine with condenser as compared to without condenser, for a given pressure and temperature of steam, is ______.
higher	lower
same as long as initial pressure and temperature is unchanged	none of the above

14. In jet type condensers ______.
cooling water passes through tubes and steam surrounds them	steam passes through tubes and cooling water surrounds them
steam and cooling water mix	steam and cooling water do not mix

15. In a shell and tube surface condenser _____.
steam and cooling water mix to give the condensate	cooling water passes through the tubes and steam surrounds them
steam passes through the cooling tubes and cooling water surrounds them	all of the above varying with situation

16. In a surface condenser if air is removed, there is _____.
fall in absolute pressure maintained in condenser	rise in absolute pressure maintained in condenser
no change in absolute pressure in the condenser	rise in temperature of condensed steam

17. The cooling section in the surface condenser _____.
increases the quantity of vapour extracted along with air	reduces the quantity of vapour extracted along with air
does not affect vapour quantity extracted but reduces pump capacity of air extraction pump	none of the above

18. Edward's air pump ______.
removes air and also vapour from condenser	removes only air from condenser
removes only un-condensed vapour from condenser	removes air alongwith vapour and also the condensed water from condenser

19. In a steam power plant, the function of a condenser is _____.
to maintain pressure below atmospheric to increase work output from the primemover	to receive large volumes of steam exhausted from steam prime mover
to condense large volumes of steam to water which may be used again in boiler	all of the above

20. In a regenerative surface condenser _____.
there is one pump to remove air and condensate	there are two pumps to remove air and condensate
there are three pumps to remove air, vapour and condensate	there is no pump, the condensate gets removed by gravity

Free Online Power Plant Engineering Quiz Questions test1

Thank you very much for taking test

Test your caliber

1. The energy radiated by sun on a bright sunny day is approximately _____.
700 W/m2	800 W/m2
1 kW/m2	2 kW/m2

2. Thorium Breeder Reactors are most suitable for India because _____.
these develop more power	its technology is simple
abundance of thorium deposits are available in India	these can be easily designed

3. The overall efficiency of thermal power plant is equal to _____.
Rankine cycle efficiency	Carnot cycle efficiency
Regenerative cycle efficiency	Boiler efficiency x turbine efficiency x generator efficiency

4. Rankine cycle efficiency of a good steam power plant may be in the range of _____.
15 to 20 percent	35 to 45 percent
70 to 80 percent	90 to 95 percent

5. Rankine cycle operating on low pressure limit of p1 and high pressure limit of p2
has higher the rnal efficiency than the carnot cycie operating between same pressure limits	has lower the"nal efficiency than carnot cycle operating between same pressure limit?
has same thermal efficiency as carnot cycle operating between same pressure limits	may be more or less depending upon the magnitudes of p1 and p2

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

7. Carnot cycle comprises of _____.
two isentropic processes and two constant volume processes	two isentropic processes and two constant pressure processes
two isothermal processes and three constant pressure processes	none of the above

8. In Rankine cycle the work output from the turbine is given by _____.
change of internal energy between inlet and outlet	change of enthaply between inlet and outlet
change of entropy between inlet and outlet	change of temperature between inlet and outlet

9. Regenerative cycle thermal efficiency _____.
is always greater than simple Rankine thermal efficiency	is greater than simple Rankine cycle thermal efficiency only when steam is bled at particular pressure
is same as simple Rankine cycle thermal efficiency	is always less than simple Rankine cycle thermal efficiency

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

11. In a regenerative feed heating cycle, the greatest economy is affected ______.
when steam is extracted from only one suitable point of steam turbine	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 only from the first stage of steam turbine

12. The maximum percentage gain in Regenerative feed heating cycle thermal efficiency
increases with number of feed heaters increasing	decreases with number of feed heaters increasing
remains same unaffected by number of feed heaters	none of the above

13. In regenerative cycle feed water is heated by _____.
exhaust gases	heaters
draining steam from the turbine	all of the above

14. Reheat cycle in steam power plant is used to _____.
utilise heat of flue gases	increase thermal efficiency
improve condenser performance	reduce loss of heat

15. Mercury is a choice with steam in binary vapour cycle because it has _____.
higher critical temperature and pressure	higher saturation temperature than other fluids
relatively low vapourisation pressure	all of the above

16. Binary'vapour cycles are used to _____.
increase the performance of the condenser	increase the efficiency of the plant
increase efficiency of the turbine	all of the above

17. A steam power station requires space ______.
equal to diesel power station	more than diesel power station
less than diesel power station	all of the above

18. Economiser is used to heat ______.
air	feed water
flue gases	all of the above

19. The modern steam turbines are _____.
impulse turbines	reaction turbines
impulse-reaction turbines	none of the above

20. The draught which a chimney produces is called _____.
induced draught	natural draught
forced draught	balanced draught

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