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130+ Transformers Solved MCQs

These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .

51.

The highest voltage for transmitting AC electrical power in India is

A. 33 kV.
B. 66 kV
C. 132 kV
D. 400 kV
E. 675 kv
Answer» E. 675 kv
52.

In a transformer the resistance between its primary and secondary is

A. zero
B. 1 ohm
C. 1000 ohms
D. infinite
Answer» D. infinite
53.

A transformer oil must be free from

A. sludge
B. odour
C. gases
D. moisture
Answer» D. moisture
54.

A Buchholz relay can be installed on

A. auto-transformers
B. air-cooled transformers
C. welding transformers
D. oil cooled transformers
Answer» D. oil cooled transformers
55.

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» D. 150°C
56.

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» D. saturation of core
57.

Distribution transformers are generally designed for maximum efficiency around

A. 90% load
B. zero load
C. 25% load
D. 50% load
Answer» D. 50% load
58.

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» C. High thermal conductivity
59.

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» B. load is balanced only
60.

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» C. on balanced as well as unbalanced loads
61.

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» A. electrical fault inside the transformer itself
62.

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» A. small air gap
63.

Which of the following does not change in an ordinary transformer ?

A. Frequency
B. Voltage
C. Current
D. Any of the above
Answer» A. Frequency
64.

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» C. High thermal conductivity
65.

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» A. load current
66.

The path of the magnetic flux in transformer should have

A. high reluctance
B. low reactance
C. high resistance
D. low resistance
Answer» B. low reactance
67.

Noise level test in a transformer is a

A. special test
B. routine test
C. type test
D. none of the above
Answer» C. type test
68.

Which of the foJIowing is not a routine test on transformers ?

A. Core insulation voltage test
B. Impedance test
C. Radio interference test
D. Polarity test
Answer» C. Radio interference test
69.

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» A. leading power factor
70.

Helical coils can be used on

A. low voltage side of high kVA trans¬formers
B. high frequency transformers
C. high voltage side of small capacity transformers
D. high voltage side of high kVA rating transformers
Answer» A. low voltage side of high kVA trans¬formers
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» D. all of the above
72.

The core used in high frequency transformer is usually

A. copper core
B. cost iron core
C. air core
D. mild steel core
Answer» C. air core
73.

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» D. 400 W
74.

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» C. maximum value
75.

Silicon steel used in laminations mainly reduces

A. hysteresis loss
B. eddy current losses
C. copper losses
D. all of the above
Answer» A. hysteresis loss
76.

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» D. High voltage winding
77.

Power transformers are generally designed to have maximum efficiency around

A. no-load
B. half-load
C. near full-load
D. 10% overload
Answer» C. near full-load
78.

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» B. Saving in winding material
79.

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» C. the voltage applied on primary side is low
80.

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 trans¬formers 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» D. loading of the transformers not in proportion to their kVA ratings
81.

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» A. Conservator
82.

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» A. no losses and magnetic leakage
83.

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» D. core flux density is increased
84.

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» C. core flux remains practically constant
85.

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» A. copper loss = iron loss
86.

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» C. increase
87.

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» A. capacitive only
88.

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» A. low power factor wattmeter
89.

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» A. hot because of heavy iron losses taking place in it due to high flux density
90.

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» B. thin coat of varnish
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» B. Sandwich type
92.

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» A. primary is supplied rated voltage
93.

Open circuit test on transformers is conducted to determine

A. hysteresis losses
B. copper losses
C. core losses
D. eddy current losses
Answer» C. core losses
94.

Short circuit test on transformers is conducted to determine

A. hysteresis losses
B. copper losses
C. core losses
D. eddy current losses
Answer» B. copper losses
95.

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» B. same polarity
96.

The transformer oil should have _____ volatility and _____ viscosity.

A. low,low
B. high,high
C. low,high
D. high,low
Answer» A. low,low
97.

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» D. to arrest flow of moisture when outside air enters the transformer
98.

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» D. Current transformer
99.

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» D. (a) and (b) both
100.

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» A. 1.5 MVA

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