Name the three power losses in a transformer

Name the three power losses in a transformer
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Answer :

Copper-loss, eddy-current loss, and hysteresis loss
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Last Answer : D. To take care of the expansion and contraction of transformer oil due to variation of temperature of surroundings

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The efficiency of a transformer is mainly dependent on (A) core losses. (B) copper losses. (C) stray losses. (D) dielectric losses.

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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

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Last Answer : C) the voltage applied on primary side is low

7 The main advantage of auto transformer over a two winding transformer is A. Hysteresis losses are reduced B. Saving in winding material C. Copper losses are negligible D. Eddy losses are totally eliminated

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Explain how technical losses can be reduced by use of energy efficient transformer in Transmission and Distribution system.

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List the losses occurring in transformer.

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Last Answer : (1) Iron losses: (a) Eddy current losses (b) Hysteresis losses (2) Copper losses

A 500 kVA, 3-phase transformer has iron losses of 300 W and full load copper losses of 600 W. The percentage

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Last Answer : A 500 kVA, 3-phase transformer has iron losses of 300 W and full load copper losses of 600 W. The percentage load at which the transformer is expected to have maximum efficiency is 70.7%

Which losses in a transformer varies significantly with load

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Last Answer : Which losses in a transformer varies significantly with load Copper losses

The hysteresis and eddy current losses of a single phase transformer working on 200 V, 50 Hz

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Last Answer : The hysteresis and eddy current losses of a single phase transformer working on 200 V, 50 Hz supply are Ph and Pe respectively. The percentage decrease in these when operated on a 160 V, 40 Hz supply are 20, 36

Eddy current losses in transformer cores can be reduced by the use of 1. Solid cores 2. Laminated cores ...

Description : Eddy current losses in transformer cores can be reduced by the use of  1. Solid cores  2. Laminated cores  3. Ferrites  Select the correct answer using the codes given below : (a) 2 and 3 only (b). 1 and 2 only (c) 1 and 3 only (d) 1, 2 and 3

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A transformer has maximum efficiency at 3/4 full load. The ratio of its iron losses and full load copper loss is : -

Description :  A transformer has maximum efficiency at 3/4 full load. The ratio of its iron losses and full load copper loss is : -  a) 16/9 b) 4 / 3 c) 3/4 d) 9 /16

Last Answer :  A transformer has maximum efficiency at 3/4 full load. The ratio of its iron losses and full load copper loss is : -  9 /16

Reduction in core losses and increase in permeability are obtained with transformer employing?

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Last Answer : Reduction in core losses and increase in permeability are obtained with transformer employing core built-up of laminations of cold rolled grain oriented steel.

In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?

Description : In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are?

Last Answer : In a given transformer for a given applied voltage, losses which remain constant irrespective of load changes are hysteresis and eddy current losses.

Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is?

Description : Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is?

Last Answer : Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is approximately equal to 1.

The leads to the primary and the high-voltage secondary windings of a power transformer usually are of what color?

Description : The leads to the primary and the high-voltage secondary windings of a power transformer usually are of what color?

Last Answer : Primary leads-black; secondary leads red.

What are the purposes of the transformer in a power supply?

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Last Answer : It couples the power supply to the ac line voltage, isolates the ac line voltage from the load, and steps this voltage up or down to the desired level.

What problem is caused by overcoupling in a transformer?

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Last Answer : Low gain at the center frequency.

What problem is caused in an rf amplifier by a loosely coupled transformer?

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Last Answer : A too-narrow bandpass.

Does 1:5 indicate a step-up or step-down transformer?

Description : Does 1:5 indicate a step-up or step-down transformer?

Last Answer : Step up.

What effect does flux leakage in a transformer have on the coefficient of coupling (K) in the transformer?

Description : What effect does flux leakage in a transformer have on the coefficient of coupling (K) in the transformer?

Last Answer : it causes K to be less than unity (I).

What causes a voltage to be developed across the secondary winding of a transformer?

Description : What causes a voltage to be developed across the secondary winding of a transformer?

Last Answer : The magnetic lines generated by the current in the primary cut

What is meant by "exciting current" in a transformer?

Description : What is meant by "exciting current" in a transformer?

Last Answer : Exciting current is the current that flows in the primary of a transformer with the secondary open (no load attached).