Transformers Electrical Engineering Quiz | Transformers Electrical Engineering Short Questions and Answers

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Questions
41 Delta/star transformer works satisfactorily when
A load is balanced only
B load is unbalanced only
C on balanced as well as unbalanced loads
D none of the above

Answer: on balanced as well as unbalanced loads
42 Star/star transformers work satisfactorily when
A load is unbalanced only
B load is balanced only
C on balanced as well as unbalanced loads
D none of the above

Answer: load is balanced only
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43 Which of the following property is not necessarily desirable in the material for transformer core ?
A Mechanical strength
B Low hysteresis loss
C High thermal conductivity
D High permeability

Answer: High thermal conductivity
44 Distribution transformers are generally designed for maximum efficiency around
A 90% load
B zero load
C 25% load
D 50% load

Answer: 50% load
45 The main reason for generation of harmonics in a transformer could be
A fluctuating load
B poor insulation
C mechanical vibrations
D saturation of core

Answer: saturation of core
46 Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds
A 50°C
B 80°C
C 100°C
D 150°C

Answer: 150°C
47 A Buchholz relay can be installed on
A auto-transformers
B air-cooled transformers
C welding transformers
D oil cooled transformers

Answer: oil cooled transformers
48 A transformer oil must be free from
A sludge
B odour
C gases
D moisture

Answer: moisture
49 In a transformer the resistance between its primary and secondary is
A zero
B 1 ohm
C 1000 ohms
D infinite

Answer: infinite
50 The highest voltage for transmitting electrical power in India is
A 33 kV
B 66 kV
C 132 kV
D 400 kV

Answer: 400 kV
51 The function of conservator in a transformer is
A to project against’internal fault
B to reduce copper as well as core losses
C to cool the transformer oil
D to take care of the expansion and contraction of transformer oil due to variation of temperature of sur-roundings

Answer: to take care of the expansion and contraction of transformer oil due to variation of temperature of sur-roundings
52 The thickness of laminations used in a transformer is usually
A 0.4 mm to 0.5 mm
B 4 mm to 5 mm
C 14 mm to 15 mm
D 25 mm to 40 mm

Answer: 0.4 mm to 0.5 mm
53 Material used for construction of transformer core is usually
A wood
B copper
C aluminium
D silicon steel

Answer: silicon steel
54 Hysteresis loss in a transformer varies as CBmax = maximum flux density)
A Bmax
B Bmax1-6
C Bmax1-83
D B max

Answer: Bmax1-6
55 The noise resulting from vibrations of laminations set by magnetic forces, is termed as
A magnetostrication
B boo
C hum
D zoom

Answer: hum
56 The transformer ratings are usually expressed in terms of
A volts
B amperes
C kW
D kVA

Answer: kVA
57 The chemical used in breather is
A asbestos fiber
B silica sand
C sodium chloride
D silica gel

Answer: silica gel
58 The chemical used in breather for transformer should have the quality of
A ionizing air
B absorbing moisture
C cleansing the transformer oil
D cooling the transformer oil.

Answer: absorbing moisture
59 The use of higher flux density in the transformer design
A reduces weight per kVA
B reduces iron losses
C reduces copper losses
D increases part load efficiency

Answer: reduces weight per kVA
60 Buchholz’s relay gives warning and protection against
A electrical fault inside the transformer itself
B electrical fault outside the transformer in outgoing feeder
C for both outside and inside faults
D none of the above

Answer: electrical fault inside the transformer itself
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