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Iron loss of a transformer can be measured by low power factor wattmeter.

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Answer :

In an actual transformer the iron loss remains practically constant from no load to full load because core flux remains practically constant.

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Answer :

If the supply frequency to the transformer is increased, the iron loss will increase.

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Description :

At full -load of a transformer, the iron loss and copper loss are 3000 W and 4000 W respectively. Then total loss at maximum efficiency is :  (A) 7000 W (B) 6000 W (C) 8000 W (D) 4000 W

Answer :

At full -load of a transformer, the iron loss and copper loss are 3000 W and 4000 W respectively. Then total loss at maximum efficiency is : 6000 W

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Description :

Dielectric loss in a capacitor is best measured by (A) Wien Bridge (B) Schering Bridge (C) Anderson Bridge (D) Heaviside-Campbell Equal Ratio Bridge

Answer :

Dielectric loss in a capacitor is best measured by Schering Bridge

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Description :

When secondary of a current transformer is open-circuited its iron core will be?

Answer :

When secondary of a current transformer is open-circuited its iron core will be hot because of heavy iron losses taking place in it due to high flux density.

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124 views 1 answer
Description :

A ferrite core has less eddy current loss than an iron core because?

Answer :

A ferrite core has less eddy current loss than an iron core because ferrites have high hysteresis.

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316 views 1 answer
Description :

A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is

Answer :

A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The proportion of full load at maximum efficiency is 0.707

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Answer :

A direct current can be measured by a D.C. potentiometer in conjunction with a standard resistance.

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Description :

The self inductance of a coil can be measured using (A) Wien’s Bridge (B) Schering Bridge (C) Anderson’s Bridge (D) Wheatstone Bridge

Answer :

The self inductance of a coil can be measured using Anderson’s Bridge

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Answer :

Resistances can be measured with the help of ohmmeters and resistance bridges.

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Description :

Corona loss in transmission lines can be reduced by (A) using small diameter conductors (B) using bundled conductors (C) using less spacing between conductors (D) increasing the transmission line voltage

Answer :

Corona loss in transmission lines can be reduced by using bundled conductors

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Description :

Answer :

The full-load copper loss of a trans¬former is 1600 W. At half-load, the copper loss will be 400 W.

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Answer :

A moving iron instrument can be used for both D.C. and A.C.

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How can power loss be reduced?

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Description :

Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.

Answer :

Parts Insulating Materials  Insulation between heating element and base plate of electric iron. Mica Insulation used over copper or aluminium conductor used for making coils.  ... Transformer bushings Porcelain  Insulation between transmission line and pole. Porcelain

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Description :

The power consumed by a balanced 3-ph load is measured by two-wattmeter method. The meter readings are 8 kW and 4 kW. The power factor of the load is (A) zero (B) 0.5 (C) between zero and 0.5 (D) between 0.5 and unity

Answer :

The power consumed by a balanced 3-ph load is measured by two-wattmeter method. The meter readings are 8 kW and 4 kW. The power factor of the load is between 0.5 and unity

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E.m.f. of a Weston cell is accurately measured by electrostatic voltmeter.

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The purpose of providing an iron core in a transformer is to decrease the reluctance of the magnetic path.

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Answer :

The purpose of providing iron core in a step-up transformer is to decrease the magnitude of magnetizing current.

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The maximum load that a power transformer can carry is limited by its?

Answer :

The maximum load that a power transformer can carry is limited by its voltage ratio.

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Description :

In a circuit containing R, L and C, power loss can take place in?

Answer :

In a circuit containing R, L and C, power loss can take place in R only.

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Description :

Eddy current damping cannot be used for moving iron instrument because

Answer :

Eddy current damping cannot be used for moving iron instrument because the presence of a permanent magnet required for such purpose would affect the deflection and hence the reading of the instrument

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Description :

Why high voltage can reduce power loss?

Answer :

when voltage has increased due to reduced current flow, thus power loss given by ( I^2R) will be low due to reduced current(I^2) provided that resistance (R) is constant.

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Description :

The load of a consumer is generally measured in terms of : (A) Volts (B) Amperes (C) Ampere hour (D) kW

Answer :

The load of a consumer is generally measured in terms of : kW

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In a battery, the difference between the no-load voltage and the measured voltage output is called ________ A) Internal voltage B) Internal resistance C) External resistance D) All the above

Answer :

In a battery, the difference between the no-load voltage and the measured voltage output is called Internal resistance

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True value has been 50 whereas measured value is 40 then the percentage error in the reading will be ______.  (A) 20% (B) 40% (C) 50% (D) 30%

Answer :

True value has been 50 whereas measured value is 40 then the percentage error in the reading will be 20%. 

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Description :

Liquid flow rate is measured using (A) a pirani gauge (B) a pyrometer (C) an orifice plate (D) a bourdon tube

Answer :

Liquid flow rate is measured using an orifice plate

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Answer :

If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is 10°.

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Answer :

A transformer can have regulation closer to zero on leading power factor.

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A transformer oil must be free from moisture.

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The main reason for generation of harmonics in a transformer could be saturation of core.

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In a transformer the resistance between its primary and secondary should be?

Answer :

In a transformer the resistance between its primary and secondary should be infinity.

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Answer :

Iron losses in a D.C. machine are independent of variations in load.

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In a D.C. generator, the iron losses mainly take place in armature rotor.

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The dielectric strength of transformer oil is expected to be?

Answer :

The dielectric strength of transformer oil is expected to be 33 kV.

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Answer :

The no load current in a transformer lags behind the applied voltage by an angle of about 75°.

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Description :

The noise produced by a transformer is termed as?

Answer :

The noise produced by a transformer is termed as hum.

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Description :

Which is the best conductor: silver, carbon, or iron?

Answer :

Silver is the best conductor. Carbon is the semiconductor. Iron have less conductance as compared to silver.

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Description :

An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be  (1) unaffected (2) decreased (3) increased (4) either decreased or increased depending on the direction of the DC field

Answer :

An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be either decreased or increased depending on the direction of the DC field

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284 views 1 answer
Description :

The iron alloy, ALNICO is mainly used to make ________ A) Temporary magnets B) Permanent magnets C) Transmission lines D) None of these

Answer :

The iron alloy, ALNICO is mainly used to make Permanent magnets

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Description :

In DC motor iron losses are occurred in?

Answer :

In DC motor iron losses are occurred in the armature.

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Description :

In AC. circuits, laminated iron is invariably used in order to?

Answer :

In AC. circuits, laminated iron is invariably used in order to reduce eddy current loss.

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Description :

The changes in the volume of transformer cooling oil due to the variation of atmospheric temperature during day and night is taken care of by which part of the transformer?

Answer :

The changes in the volume of transformer cooling oil due to the variation of atmospheric temperature during day and night is taken care of by conservator.

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Description :

Answer :

The transformer laminations are insulated from each other by thin coat of varnish.

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Description :

The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is :  (A) 256 W (B) 320 W (C) 500 W (D) 625 W

Answer :

The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is : 625 W

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Description :

In a magnetic material hysteresis loss takes place primarily due to?

Answer :

In a magnetic material hysteresis loss takes place primarily due to it high retentivity.

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200 views 1 answer
Description :

In a loss-free R-L-C circuit the transient current is?

Answer :

In a loss-free R-L-C circuit the transient current is sinusoidal.

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Answer :

In a D.C. machine stray loss is the sum of iron loss and mechanical loss.

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Answer :

Corona is nothing but the ionization of surrounding air around the conductor which produces hissing noise,

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Description :

State the factors affecting hysteresis loss.

Answer :

i) Flux density ii) Frequency iii) Volume of the magnetic material iv) Nature of magnetic material

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