Deck 6: Electrical Energy and Power Plants

Question 1

Load duration curve indicates  

A)the variation of load during different hours of the day
B)total number of units generated for the given demand
C)total energy consumed by the load
D)the number of hours for which the particular load lasts during a day

Answer 1

the number of hours for which the particular load lasts during a day

Question 2

During which time the demand of electrical energy is maximum?

A)2 a.m. to 5 a.m.
B)5 a.m. to 12 p.m.
C)12 p.m. to 7 p.m.
D)7 p.m. to 9 p.m

Answer 2

7 p.m. to 9 p.m

Question 3

Size and cost of installation depends upon

A)average load
B)maximum demand
C)square mean load
D)square of peak load

Answer 3

maximum demand

Question 4

What is Demand factor?

A)ratio of connected load to maximum demand
B)ratio of average load to connected load
C)ratio of maximum demand to the connected load
D)ratio of kilowatt hour consumed to 24 hours

Question 5

The load factor is  

A)always less than unity
B)less than or greater than 1
C)always greater than 1
D)less than zero

Question 6

In practice what is the value of diversity factor?

A)less than unity
B)geater than unity
C)equal to or greater than unity
D)less than zero

Question 7

Which of the following is called as cold reserve?

A)reserve capacity available but not ready for use
B)reserve capacity available and ready for use
C)generating capacity connected to bus and ready to take load
D)capacity in service in excess of peak load

Question 8

How are moderate active solid wastes disposed?

A)buried underground
B)buried under sea
C)sent to outer space
D)left out in streams or rivers

Question 9

Moderate liquid nuclear wastes are disposed into  

A)deep pits
B)buried underground
C)left into rivers
D)left into deep oceans

Question 10

How are active liquids of nuclear waste disposed?

A)stored in concrete tanks and buried underground
B)stored in concrete tanks and buried in sea
C)mixed with other chemicals and left into free atmosphere
D)they are reused and burnt away in gaseous fumes

Question 11

Can vacated coal mines be used for waste disposal.

Question 12

How is High Level solidified nuclear wastes (HLW) stored?

A)concrete tanks
B)canisters
C)packed rock salt
D)soil bins

Question 13

Absorption of radioactive element by human, affects their offspring's.

Question 14

For how many days is radioactive solid waste kept is kept under water at 6m deep for initial cooling?

A)15 days
B)50 days
C)30 days
D)100 days

Question 15

What are released into biosphere from nuclear power plants?

A)gaseous effluents
B)waste product
C)smoke
D)the obtained product

Question 16

Tailings forms are the residues from

A)uranium
B)thorium
C)cadmium
D)boron

Question 17

LLW stands for  

A)low level water
B)low laser width
C)low level waste
D)loss of levels in water

Question 18

What is the unit of Heat rate?

A)kj/kw
B)kw/kj
C)kj
D)kw

Question 19

Rankine efficiency of a Steam Power Plant

A)improves in summer as compared to that in winter
B)improves in winter as compared to that in summer
C)is unaffected by climatic conditions
D)none of the mentioned

Question 20

Which of the following contributes to the improvement of efficiency of Rankine cycle in a Thermal Power Plant?

A)reheating of steam at intermediate stage
B)regeneration use of steam for heating boiler feed water
C)use of high pressures
D)all of the mentioned

Question 21

What is the actual turbine inlet temperature in Rankine cycle?

A)700°c
B)800°c
C)550°c
D)1150°c

Question 22

Rankine cycle efficiency of a good Steam Power Plant may be in the range of?

A)15 to 20%
B)35 to 45%
C)70 to 80%
D)90 to 95%

Question 23

A simple Rankine cycle produces 40 MW of power, 50 MW of process heat and rejects 60 MW of heat to the surroundings. What is the utilization factor of this co generation cycle neglecting the pump work?

A)50
B)60
C)70
D)80

Question 24

Which type of boilers use orifice to control the flow circulation?

A)natural circulation boilers
B)forced convection boilers
C)once-through boilers
D)positive forced circulation boilers

Question 25

What is the advantage of having smaller ratio of water to steam space?

A)steam can be generated at a faster even if the boiler is cold
B)increases the rate of evaporation
C)water is made cyclic, i.e., from boiler drum to water tube and back to drum
D)helps in mobilizing the boiler