Transformers Electrical Engineering Quiz | Transformers Electrical Engineering MCQs and Answers

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Questions
81 A shell-type transformer has
A high eddy current losses
B reduced magnetic leakage
C negligibly hysteresis losses
D none of the above

Answer: reduced magnetic leakage
82 N atural air coo ling is generally restricted for transformers up to
A 1.5 MVA
B 5 MVA
C 15 MVA
D 50 MVA

Answer: 1.5 MVA
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83 The size of a transformer core will depend on
A frequency
B area of the core
C flux density of the core material
D (a) and (b) both

Answer: (a) and (b) both
84 The secondary winding of which of the following transformers is always kept closed ?
A Step-up transformer
B Step-down transformer
C Potential transformer
D Current transformer

Answer: Current transformer
85 The function of breather in a transformer is
A to provide oxygen inside the tank
B to cool the coils during reduced load
C to cool the transformer oil
D to arrest flow of moisture when outside air enters the transformer

Answer: to arrest flow of moisture when outside air enters the transformer
86 The transformer oil should have _____ volatility and _____ viscosity.
A low,low
B high,high
C low,high
D high,low

Answer: low,low
87 For the parallel operation of single phase transformers it is necessary that they should have
A same efficiency
B same polarity
C same kVA rating
D same number of turns on the secondary side.

Answer: same polarity
88 Short circuit test on transformers is conducted to determine
A hysteresis losses
B copper losses
C core losses
D eddy current losses

Answer: copper losses
89 Open circuit test on transformers is conducted to determine
A hysteresis losses
B copper losses
C core losses
D eddy current losses

Answer: core losses
90 During open circuit test of a transformer
A primary is supplied rated voltage
B primary is supplied full-load current
C primary is supplied current at reduced voltage
D primary is supplied rated kVA

Answer: primary is supplied rated voltage
91 Which type of winding is used in 3phase shell-type transformer ?
A Circular type
B Sandwich type
C Cylindrical type
D Rectangular type

Answer: Sandwich type
92 The transformer laminations are insulated from each other by
A mica strip
B thin coat of varnish
C paper
D any of the above

Answer: thin coat of varnish
93 When secondary of a current transformer is open-circuited its iron core will be
A hot because of heavy iron losses taking place in it due to high flux density
B hot because primary will carry heavy current
C cool as there is no secondary current
D none of above will happen

Answer: hot because of heavy iron losses taking place in it due to high flux density
94 Iron loss of a transformer can be measured by
A low power factor wattmeter
B unity power factor wattmeter
C frequency meter
D any type of wattmeter

Answer: low power factor wattmeter
95 Negative voltage regulation is indicative that the load is
A capacitive only
B inductive only
C inductive or resistive
D none of the above

Answer: capacitive only
96 If the supply frequency to the transformer is increased,”the iron loss will
A not change
B decrease
C increase
D any of the above

Answer: increase
97 An ideal transformer will have maximum efficiency at a load such that
A copper loss = iron loss
B copper loss < iron loss
C copper loss > iron loss
D none of the above

Answer: copper loss = iron loss
98 In an actual transformer the iron loss remains practically constant from noload to fullload because
A value of transformation ratio remains constant
B permeability of transformer core remains constant
C core flux remains practically constant
D primary voltage remains constant

Answer: core flux remains practically constant
99 When a given transformer is run at its rated voltage but reduced frequency, its
A flux density remains unaffected
B iron losses are reduced
C core flux density is reduced
D core flux density is increased

Answer: core flux density is increased
100 An ideal transformer is one which has
A no losses and magnetic leakage
B interleaved primary and secondary windings
C a common core for its primary and secondary windings
D core of stainless steel and winding of pure copper metal

Answer: no losses and magnetic leakage

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