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If the supply frequency to the transformer is increased, the iron loss will?
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If the supply frequency to the transformer is increased, the iron loss will
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In an actual transformer the iron loss remains practically constant from no load to full load because?
Iron loss of a transformer can be measured by?
At full -load of a transformer, the iron loss and copper loss are 3000 W and 4000 W respectively. Then total
If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then?
When secondary of a current transformer is open-circuited its iron core will be?
What will happen if the primary of a transformer is connected to D.C. supply?
The effective resistance of an iron-cored choke working on ordinary supply frequency...
A ferrite core has less eddy current loss than an iron core because?
In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of?
The time period of third harmonic of power supply frequency, in milliseconds, is
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What would happen if a power transformer designed for operation on 50 Hz (frequency) were connected to
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A 40 kVA transformer has a core loss of 400 W and a full load copper loss of 800 W. The
If the load of the normally excited synchronous motor is increased the power factor will?
Why does a transformer only work with an AC supply?
The maximum constant load torque under which a synchronous motor will pull into synchronism...
The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor...
As the load is increased the speed of D.C. shunt motor will?
The full-load copper loss of a transformer is 1600 W At half-load, the copper loss will be?
The purpose of providing an iron core in a transformer is to?
The increased load during summer months is due to?
If a transformer is continuously operated the maximum temperature rise will occur in?
If a D.C. series motor is operated on A.C. supply, it will?
The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density.
The purpose of providing iron core in a step-up transformer is?
If a transformer is switched on to a voltage more than the rated voltage?
If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is?
A change of 4% in the supply voltage to an induction motor will produce a change of approximately
What happens to the voltage in the secondary when the frequency of the supply in the primary is decreased?
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 ________
If the frequency of input voltage of a transformer is increased keeping the magnitude of voltage unchanged,
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.
For high value of diversity factor, a power station of given installed capacity will be in a position to supply?
The steady state stability of the power system can be increased by?
In AC. circuits, laminated iron is invariably used in order to?
The core used in high frequency transformer is usually?
Stability of a transmission line can be increased by
A transformer cannot raise or lower the voltage of a D.C. supply because?
The inrush current of a transformer at no load is maximum if the supply voltage is switched on
A transformer at 25 Hz develops 20 W hysteresis loss and 50 W eddy current loss. If the applied voltage and
When a given transformer is run at its rated voltage but reduced frequency, its?
Which is the best conductor: silver, carbon, or iron?
The size of a transformer core will depend on?
While keeping the excitation constant, if the steam supply of an alternator running in parallel with another
After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on?
The primary reason for low power factor is supply system is due to installation of?
In a magnetic material hysteresis loss takes place primarily due to?
Explain hysteresis loss, eddy current loss and skin effect limitations with reference to magnetic material.