free Model Online Economics of Power Generation test2

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1. ________ is invariably used for peak load.
Nuclear power plant	Steam turbine plant
Pumped storage plant	None of the above

2. Which of the following is not an operating cost ?
Maintenance cost	Fuel cost
Salaries of high officials	Salaries of operating staff

3. Which of the following is the essential requirement of peak load plant?
It should run at high speed	It should produce high voltage
It should be small in size	It should be capable of starting quickly

4. Large capacity generators are invariably _____.
water cooled	natural air cooled
forced air cooled	hydrogen cooled

5. By the use of which of the following power factor can be improved ?
Phase advancers	Synchronous compensators
Static capacitors	Any of the above

6. An induction motor has relatively high power factor at _____.
rated r.p.m.	no load
20 percent load	near full load

7. Which of the following is the disadvantage due to low power factor ?
Poor voltage regulation	Increased transmission losses
High cost of equipment for a given load	All of the above

8. In a distribution system, in order to improve power factor, the synchronous capacitors are installed
at the receiving end	at the sending end
either (a) or (b)	none of the above

9. Satic capacitors are rated in terms of _____.
kW	kWh
kVAR	none of the above

10. Which of the following is the disadvantage of a synchronous condenser ?
High maintenance cost	Continuous losses in motor
Noise	All of the above

11. For a consumer the most economical power factor is generally _____.
0.5 lagging	0.5 leading
0.95 lagging	0.95 leading

12. A synchronous condenser is virtually which of the following ?
Induction motor	Under excited synchronous motor
Over excited synchronous motor	D.C. generator

13. For a power plant which of the following constitutes running cost ?
Cost of wages	Cost of fuel
Cost of lubricants	All of the above

14. In an interconnected system, the diversity factor of the whole system _____.
remains unchanged	decreases
increases	none of the above

15. Generators for peak load plants are usually designed for maximum efficiency at _____.
25 to 50 percent full load	50 to 75 percent full load
full load	25 percent overload

16. ________ will be least affected due to charge in supply voltage frequency.
Electric clock	Mixer grinder
Ceiling fan	Room heater

17. The connected load of a IVMIM uir consumer is around _____.
5 kW	40 k\V
80 kW	120 kW

18. Which of the following is not necessarily an advantage of interconnecting various power stations ?
Improved frequency of power supplied	Reduction in total installed capacity
Increased reliability	Economy in operation of plants

19. A power transformer is usually rated in ______.
kW	kVAR
kWh	kVA

20. _____ public sector undertaking is associated with erection and sometimes running of thermal power plants.
NTPC	SAIL
BEL	BHEL