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

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Questions
1 Which winding in a transformer has more number of turns ?
A Low voltage winding
B High voltage winding
C Primary winding
D Secondary winding

Answer: High voltage winding
2 Primary winding of a transformer
A is always a low voltage winding
B is always a high voltage winding
C could either be a low voltage or high voltage winding
D none of the above

Answer: could either be a low voltage or high voltage winding
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3 A transformer cannot raise or lower the voltage of a D.C. supply because
A there is no need to change the D.C. voltage
B a D.C. circuit has more losses
C Faraday’s laws of electromagnetic induction are not valid since the rate of change of flux is zero
D none of the above

Answer: Faraday’s laws of electromagnetic induction are not valid since the rate of change of flux is zero
4 A transformer transforms
A voltage
B current
C power
D frequency

Answer: power
5 In the transformer following winding has got more cross-sectional area
A Low voltage winding
B High voltage winding
C Primary winding
D Secondary winding

Answer: Low voltage winding
6 While conducting short-circuit test on a transformer the following side is short circuited
A High voltage side
B Low voltage side
C Primary side
D Secondary side

Answer: Low voltage side
7 Which of the following is not a part of transformer installation ?
A Conservator
B Breather
C Buchholz relay
D Exciter

Answer: Exciter
8 The purpose of providing an iron core in a transformer is to
A provide support to windings
B reduce hysteresis loss
C decrease the reluctance of the magnetic path
D reduce eddy current losses

Answer: decrease the reluctance of the magnetic path
9 No-load current in a transformer
A lags behind the voltage by about 75°
B leads the voltage by about 75°
C lags behind the voltage by about 15°
D leads the voltage by about 15°

Answer: lags behind the voltage by about 75°
10 The efficiency of a transformer will be maximum when
A copper losses = hysteresis losses
B hysteresis losses = eddy current losses
C eddy current losses = copper losses
D copper losses = iron losses

Answer: copper losses = iron losses
11 The permissible flux density in case of cold rolled grain oriented steel is around
A 1.7 Wb/m2
B 2.7 Wb/m2
C 3.7 Wb/m2
D 4.7 Wb/m2

Answer: 1.7 Wb/m2
12 Sumpner’s test is conducted on trans-formers to determine
A temperature
B stray losses
C all-day efficiency
D none of the above

Answer: temperature
13 The dielectric strength of transformer oil is expected to be
A lkV
B 33 kV
C 100 kV
D 330 kV

Answer: 33 kV
14 No-load on a transformer is carried out to determine
A copper loss
B magnetising current
C magnetising current and loss
D efficiency of the transformer

Answer: magnetising current and loss
15 The path of a magnetic flux in a transformer should have
A high resistance
B high reluctance
C low resistance
D low reluctance

Answer: low reluctance
16 The no-load current drawn by transformer is usually what per cent of the full-load current ?
A 0.2 to 0.5 per cent
B 2 to 5 per cent
C 12 to 15 per cent
D 20 to 30 per cent

Answer: 2 to 5 per cent
17 The degree of mechanical vibrations produced by the laminations of a transformer depends on
A tightness of clamping
B gauge of laminations
C size of laminations
D all of the above

Answer: all of the above
18 A transformer core is laminated to
A reduce hysteresis loss
B reduce eddy current losses
C reduce copper losses
D reduce all above losses

Answer: reduce eddy current losses
19 In a transformer the energy is conveyed from primary to secondary
A through cooling coil
B through air
C by the flux
D none of the above

Answer: by the flux
20 Which of the following does not change in a transformer ?
A Current
B Voltage
C Frequency
D All of the above

Answer: Frequency

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