Q.61 The excitation control method of
voltage control is used ___
A. only
for short transmission line
B. only
for long transmission line
C. only
for medium transmission line
D. any of
the above
Ans.: A
Q.62 Tapped changing transformer method
of voltage control is used in
A. short
transmission line
B. long
transmission line
C. medium
transmission line
D. none of
the above
Ans.: B
Q.63 Tapped changing in transformer
means___
A.
changing the voltage ratio
B.
changing the ratio of transformation
C.
changing current ratio
D. all of
the above
Ans.: B
Q.64 In tapped changing method of
voltage control the number of turns on primary side is decrease then ___
A. emf per
turn is increases
B. increases
in secondary output voltage
C. decrease
emf per turns and secondary output voltage
D. Both a
and B
Ans.: D
Q.65 Tap changing is always on____
A. high
voltage winding side
B. low
voltage winding side
C. at
intermediate between low and high voltage
D. on high
voltage transmission line
Ans.: A
Q.66 If the tapping at which the turns
included are more than that of principal tapping is called___
A.
negative tapping
B. positive
tapping
C. zero
taping
D. depend
on voltage of load side
Ans.: B
Q.67 The tapping is placed ______
A. on the primary
side
B. on the
secondary side
C. either
primary or secondary
D. neither
primary nor secondary
Ans.: C
Q.68 In transformer installed at end of
a transmission line, the tapping is provided on the
A.
secondary side
B. primary
side
C. at the
center of the core
D. none of
the above
Ans.: B
Q.69 the transformer installed at
generating station, the tapping is provided on the
A.
secondary side
B. primary
side
C. at the
center of the core
D. any of
the above
Ans.: A
Q.70 Why tapping are usually provided on
the HV voltage winding?
A. It is
difficult to tap on LV winding, since it is placed next to the core
B. HV
winding is placed outside the LV winding so it is easily accessible
C. large number
of the turns on the HV, so fine and smoother control of output voltage is
obtained
D. all of
the above
Ans.: D
Q.71 Tap changing in transformer may be
done
A. Only on
load tap changing
B. only
Off load tap changing
C. Either
On load or Off load
D. neither
of above
Ans.: C
Q.72 Why mechanical lock is provided in tap
changing transformer?
A. for
preventing inadvertent operation
B. to
prevent unauthorized operation of the off load changer
C. to
prevent unnecessary operation of protecting device used for transformer
protection
D. all of
the above
Ans.: D
Q.73 Which of the following one is cheapest
method of changing the turn ratio of a transformer?
A. Off
load tap changing
B. On load
tap changing
C. manual
changing the number of turns
D. none
the above
Ans.: A
Q.74 Which of the following voltage
control method is employed while the transformer is delivering load?
A. Off
load tap changing method
B. On load
tap changing method
C. Excitation
control method
D. static
device voltage control method
Ans.: B
Q.75 A tapping at which the number of
turns included is less than at the principal tapping is known as__
A.
negative tapping
B. zero
tapping
C. positive
taping
D. none of
the above
Ans.: A
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