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Iron loss of a transformer can be measured by?
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Iron loss of a transformer can be measured by
low power factor wattmeter.
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In an actual transformer the iron loss remains practically constant from no load to full load because?
If the supply frequency to the transformer is increased, the iron loss will?
At full -load of a transformer, the iron loss and copper loss are 3000 W and 4000 W respectively. Then total
Dielectric loss in a capacitor is best measured by
When secondary of a current transformer is open-circuited its iron core will be?
A ferrite core has less eddy current loss than an iron core because?
A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The
A direct current can be measured by?
The self inductance of a coil can be measured using
Corona loss in transmission lines can be reduced by
Resistances can be measured with the help of?
A moving iron instrument can be used for?
The full-load copper loss of a transformer is 1600 W At half-load, the copper loss will be?
E.m.f. of a Weston cell is accurately measured by?
How can power loss be reduced?
The power consumed by a balanced 3-ph load is measured by two-wattmeter method. The meter readings are
The maximum load that a power transformer can carry is limited by its?
The purpose of providing an iron core in a transformer is to?
The purpose of providing iron core in a step-up transformer is?
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.
If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is?
In a circuit containing R, L and C, power loss can take place in?
Eddy current damping cannot be used for moving iron instrument because
The load of a consumer is generally measured in terms of :
Why high voltage can reduce power loss?
The no load current in a transformer lags behind the applied voltage by an angle of about?
The main reason for generation of harmonics in a transformer could be?
Iron losses in a D.C. machine are independent of variations in?
In a battery, the difference between the no-load voltage and the measured voltage output is called ________
A transformer can have regulation closer to zero?
The dielectric loss of capacitance can be measured by
The noise produced by a transformer is termed as?
A transformer oil must be free from?
In a transformer the resistance between its primary and secondary should be?
In a D.C. generator, the iron losses mainly take place in?
The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density.
In a D.C. machine stray loss is the sum of?
Atmospheric temperature during day and night is taken care of by which part of the transformer?
The dielectric strength of transformer oil is expected to be?
True value has been 50 whereas measured value is 40 then the percentage error in the reading
Liquid flow rate is measured using
In a magnetic material hysteresis loss takes place primarily due to?
In a loss-free R-L-C circuit the transient current is?
The transformer laminations are insulated from each other by?
Helical coils can be used on?
State Magneto-striction. Draw Hysteresis loop for : (i) High silicon steel (ii) Copper (iii) Soft iron (iv) Wood
Which is the best conductor: silver, carbon, or iron?
An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic
The iron alloy, ALNICO is mainly used to make ________
In DC motor iron losses are occurred in?