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

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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