Q.61 A power transformers used in
substations to__
A. change
frequency
B. step up
or step down the voltage
C. to
improve the power factor
D. to
convert AC into DC
Ans.: B
Q.62 For rating up to 10 MVA____
transformers is used.
A.
Naturally cooled oil immersed
B.
naturally cooled oil forced
C. air
forced oil immersed
D. air
force oil circulated
Ans.: A
Q.63 Which of the following instrument
transformer is used in substations
A. CT
B. PT
C. Both A
and B
D. neither
A nor B
Ans.: C
Q.64 Which of the following is more
prone to fault?
A. Indoor
type substation
B.
Underground type substation
C. Outdoor
type substation
D. all of
the above
Ans.: C
Q.65 Indoor substation are usually for a
voltage ____.
A. up to
66 KV
B. up to
11 KV
C. up to
33 KV
D. up to
132 KV
Ans.: B
Q.66 If the surrounding atmosphere is
contaminated with impurities like fumes, dust and metal corroding, the indoor
substations are erected for voltage up to___
A. 33 KV
B. 66 KV
C. Both A
and B
D. 132 KV
Ans.: C
Q.67 Foundation mounted sub-stations,
transformers of capacity __ is used.
A. below
250 KVA
B. up to
10 KVA
C. up to
200 KVA
D. above
250 KVA
Ans.: D
Q.68 Pole mounted substations,
transformers of capacity ____ is employed.
A. up to
25 KVA
B. up to
125 KVA
C. Up to
250 KVA
D. all of
the above
Ans.: D
Q.69 Substations for primary and
secondary transmission are ____
A. pole
mounted Indoor type
B. foundation
mounted outdoor type
C.
foundation mounted indoor type
D. pole
mounted outdoor type
Ans.: B
Q.70 Selection and location of site for
a substations is depends on___
A.
availability of suitable and sufficient land
B. Type of
substations
C.
Atmospheric conditions and
D. all of
the above
Ans.: D
Q.71 Why aluminum is used for numerous
switchgear installation over copper?
A. higher
conductivity on weight basis
B. lower
cost for equal current carrying capacity
C. excellence
corrosion resistance
D. all of
the above
Ans.: D
Q.72 In substations the bus bars are
painted or coated with enamel paints because of ____
A. to
indicate different phases in three phase systems
B. to
indicate positive and negative in DC system
C. Both A
and B
D. to
reduce the effective cooling
Ans.: C
Q.73 Why hollow bus bar conductors are
used instead of solid one?
A. due to
skin effect
B.
proximity effect
C.
Ferranti effect
D. all of
the above
Ans.: A
Q.74 The bus bar conductors are
supported on___
A. Pin
type insulators
B. Post
type insulators
C. Strain
type insulators
D. Both B
or C
Ans.: D
Q.75 ______ which combines the function
of the isolators and a switch.
A. Circuit
breaker
B. load
interrupter switches
C. Earth
switches
D. Line
trap unit
Ans.: B
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