Q.76 Earth switch is connected between
A. line
and earth
B. two
lines
C. line
and neutral
D. circuit
breaker and isolators
Ans.: A
Q.77 Which of the following is normally
open in substations?
A. Circuit
breaker
B. Earth
switch
C.
Isolators
D. none of
the above
Ans.: B
Q.78 A power transformers are designed
to have maximum efficiency ___
A. at full
load
B. near to
full load
C. Both A
or B
D. at 50%
of full load
Ans.: C
Q.79 Power transformers usually designed
to make use of flux density of __
A. 1.5 to
1.77
B. 0.5 to
1.5
C. 1 to
1.5
D. 0.5 to
7.7
Ans.: A
Q.80 The voltage regulation of power
transformer is ranging from___
A. 5 to 8%
B. 6-10%
C. 10-12%
D. 10-15%
Ans.: B
Q.81 The control system in substations
generally operated at__
A. 110V
B. 220 V
C. Both A
or B
D. 400V
Ans.: C
Q.82 Carrier current equipment is
installed in substations for___
A.
relaying
B.
Communication
C.
Telemetering or supervisory control
D. all of
the above
Ans.: D
Q.83 The indicating and metering
instruments used in substations are___
A.
Ammeters, Voltmeters
B.
Wattmeter, power factor meters
C. KWh and
KVARh meters
D. all of
the above
Ans.: D
Q.84 Batteries are used in substation
for the purpose of__
A.
emergency lighting
B. to
supply operating and control circuits
C. to
supply protective relaying systems
D. all of
the above
Ans.: D
Q.85 Which of the following is closed
after line is disconnected from the supply?
A.
isolators
B. Earth
switch
C. Circuit
breakers
D. relays
Ans.: B
Q.86 Which of the following is closed
first for supplying power after repairs or maintenance?
A. isolators
B. Earth
switch
C. Circuit
breakers
D. relays
Ans.: A
Q.87 Which of the following is secondary
transmission voltage?
A. 66 KV
B. 33 KV
C. 400 KV
D. Both A
or B
Ans.: D
Q.88 Which of the following is primary
transmission voltage?
A. 132 KV
B. 400KV
C. 765 KV
D. all of
the above
Ans.: D
Q.89 Which of the following is remains
open during normal operation of power system?
A. Earth
switch
B. Circuit
breaker
C.
Isolators
D.
indicating instruments
Ans.: A
Q.90 A charging current is discharge
through_____ after the line is disconnected from the main supply?
A. Earth
switch
B. Circuit
breaker
C.
Isolators
D.
indicating instruments
Ans.: A
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