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Power Systems
Quiz 1
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Q.1
How much wind power does India hold?
20,000 MW
12,000 MW
140,000 MW
5000 MW
Q.2
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
Q.3
Solar thermal power generation can be achieved by
using focusing collector or heliostates
using flat plate collectors
using a solar pond
any of the above system
Q.4
At what range of speed is the electricity from the wind turbine is generated?
100 – 125 mph
450 – 650 mph
250 – 450 mph
30-35 mph
Q.5
What should be the value of earthing resistance for large power stations?
1 Ω
0.5 Ω
2 Ω
5 Ω
Q.6
When did the development of wind power in India began?
1965
1954
1990
1985
Q.7
If the load current decreases then the power factor
Will also decrease
Will increase
Will remains unchanged
None of these
Q.8
Power factor of a load can be improved by using
Static capacitors
Synchronous condenser
Phase advancer
All of the above
Q.9
Which of the following is not the distribution system normally used
3 phase-4 wire
3 phase-3 wire
Single phase - 3 wire
Single phase -4 wire.
Q.10
Which type of system is generally adopted for the generation and transmission of electrical power?
3 phase 4 wire
2 phase 3 wire
3 phase 3 wire
None of these
Q.11
The steady state stability of the power system can be improved by
Increasing the number of parallel lines between the transmission points
Connecting capacitors in series with the line
Reducing the excitation of the machines
Both a and b
Q.12
The stability of the power system is not affected by which among these?
Generator reactance
Line losses
Excitation of generators
All of these
Q.13
Various power system faults in increasing order of severity are
LG,LL,LLG,LLLG
LLLG,LLG,LG,LL
LLG,LLLG,LL,LG
LL,LG,LLLG,LLG
Q.14
What percentage of fault occurring in the power system is line to line fault
5 %
30 %
25 %
15 %
Q.15
A _________ distribution system is more reliable than the ______ distribution system.
parallel, radial
parallel, ring
radial, parallel
ring, parallel
Q.16
The amount of energy available in the wind at any instant is proportional to ___ of the wind speed.
Square root power of two
Square root power of three
Square power
Cube power
Q.17
What is the expression for fault current in line to line fault?
If = √3 * (Ea / Z1 + Z2)
If = 3 * (Ea / Z1 + Z2)
If = √3 * (Ea / Z1 + Z2 + Z0)
If = 3 * (Ea / Z1 + Z2 + Z05)
Q.18
Winds having following speed are suitable to operate wind turbines.
5 – 25m/s
10 – 35m/s
20 – 45m/s
30 – 55m/s
Q.19
The rated voltage of a 3 phase power system is given by
rms peak voltage
Peak phase voltage.
rms line to line voltage
Peak line to line voltage.
Q.20
What are the terminal conditions in case of SLG fault, if the fault occurs in the phase A?
Vb = 0, Ia = 0, Ic = 0
Va = 0, Ib = 0, Ic = 0
Va = 0, Ia = 0, Ic = 0
Vb = 0, Ia = 0, Ib = 0
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