Electrical Mcqs Quiz#03

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Electrical Mcqs Quiz#03 | 2020 |

Transformer based

Two transformers operating in parallel will share the load depending upon their............?

2 points

(a) leakage reactance

(b) per unit impedance

(d) ratings

Clear selection

If R2 is the resistance of secondary winding of the transformer and K is the transformation ratio then the equivalent secondary resistance referred to primary will be

2 points

(a) R2/VK

(b) R2IK2

(d) R22/K

Clear selection

What will happen if the transformers working in parallel are not connected with regard to polarity?

2 points

(a) The power factor of the two trans-formers will be different from the power factor of common load

(b) Incorrect polarity will result in dead short circuit

(d) none of the above

Clear selection

In a transformer tapping are generally provided on.......

2 points

(a) primary side

(b) secondary side

(d) high voltage side

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The use of higher flux density in the transformer design................

2 points

(a) reduces weight per kVA

(6) reduces iron losses

(d) increases part load efficiency

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The chemical used in breather for transformer should have the quality of........

2 points

(a) Ionizing air

(b) absorbing moisture

(d) cooling the transformer oil.

Clear selection

The chemical used in breather as ........

2 points

(a) asbestos fiber

(b) silica sand

(d) silica gel

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Which of the following does not change in a transformer ?

2 points

(a) Current

(b) Voltage

(d) All of the above

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In a transformer the energy is conveyed from primary to secondary.

2 points

(a) through cooling coil

(b) through air

(d) none of the above

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A transformer core is laminated to

2 points

(a) reduce hysteresis loss

(b) reduce eddy current losses

(d) reduce all above losses

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The degree of mechanical vibrations produced by the lamination of a transformer depends on.

2 points

(a) tightness of clamping

(b) gauge of laminations

(d) all of the above

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No-load current of a transformer has....

2 points

(a) has high magnitude and low power factor

(b) has high magnitude and high power factor

(d) has small magnitude and low power factor

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Greater the secondary leakage flux...

2 points

(a) less will be the secondary induced e.m.f.

(b) less will be the primary induced e.m.f.

(d) none of the above

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The power transformer is a constant

2 points

(a) voltage device

(b) current device

(d) main flux device

Clear selection

Two transformers operating in parallel will share the load depending upon their

2 points

(a) leakage reactance

(b) per unit impedance

(d) ratings

Clear selection

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