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