Transformers Electrical Engineering Quiz | Transformers Electrical Engineering Multiple Choice Questions with Answers

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Questions
61 The changes in volume of transformer cooling oil due to variation of atmospheric temperature during day and night is taken care of by which part of transformer
A Conservator
B Breather
C Bushings
D Buchholz relay

Answer: Conservator
62 Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in
A short-circuiting of the secondaries
B power factor of one of the transformers is leading while that of the other lagging
C transformers having higher copper losses will have negligible core losses
D loading of the transformers not in proportion to their kVA ratings

Answer: loading of the transformers not in proportion to their kVA ratings
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63 During short circuit test iron losses are negligible because
A the current on secondary side is negligible
B the voltage on secondary side does not vary
C the voltage applied on primary side is low
D full-load current is not supplied to the transformer

Answer: the voltage applied on primary side is low
64 Which of the following is the main advantage of an auto-transformer over a two winding transformer ?
A Hysteresis losses are reduced
B Saving in winding material
C Copper losses are negligible
D Eddy losses are totally eliminated

Answer: Saving in winding material
65 Power transformers are generally designed to have maximum efficiency around
A no-load
B half-load
C near full-load
D 10% overload

Answer: near full-load
66 Which winding of the transformer has less cross-sectional area ?
A Primary winding
B Secondary winding
C Low voltage winding
D High voltage winding

Answer: High voltage winding
67 Silicon steel used in laminations mainly reduces
A hysteresis loss
B eddy current losses
C copper losses
D all of the above

Answer: hysteresis loss
68 The value of flux involved m the e.m.f. equation of a transformer is
A average value
B r.m.s. value
C maximum value
D instantaneous value

Answer: maximum value
69 The full-load copper loss of a trans¬former is 1600 W. At half-load, the copper loss will be
A 6400 W
B 1600 W
C 800 W
D 400 W

Answer: 400 W
70 The core used in high frequency transformer is usually
A copper core
B cost iron core
C air core
D mild steel core

Answer: air core
71 Harmonics in transformer result in
A increased core losses
B increased I2R losses
C magnetic interference with communication circuits
D all of the above

Answer: all of the above
72 Helical coils can be used on
A low voltage side of high kVA transformers
B high frequency transformers
C high voltage side of small capacity transformers
D high voltage side of high kVA rating transformers

Answer: low voltage side of high kVA transformers
73 A transformer can have zero voltage regulation at
A leading power factor
B lagging power factor
C unity power factor
D zero power factor

Answer: leading power factor
74 Which of the following is not a routine test on transformers ?
A Core insulation voltage test
B Impedance test
C Radio interference test
D Polarity test

Answer: Radio interference test
75 Noise level test in a transformer is a
A special test
B routine test
C type test
D none of the above

Answer: type test
76 The path of the magnetic flux in transformer should have
A high reluctance
B low reactance
C high resistance
D low resistance

Answer: low reactance
77 The leakage flux in a transformer depends upon
A load current
B load current and voltage
C load current, voltage and frequency
D load current, voltage, frequency and power factor

Answer: load current
78 Which of the following properties is not necessarily desirable for the material for transformer core ?
A Low hysteresis loss
B High permeability
C High thermal conductivity
D Adequate mechanical strength

Answer: High thermal conductivity
79 Which of the following does not change in an ordinary transformer ?
A Frequency
B Voltage
C Current
D Any of the above

Answer: Frequency
80 The magnetising current of a transformer is usually small because it has
A small air gap
B large leakage flux
C laminated silicon steel core
D fewer rotating parts

Answer: small air gap

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