How the PF meter is connected in the motor circuit
Fixed coil in parallel with the supply and moving the coil in series with single phase motor
Fixed coil across the motor and moving coil across the supply
Fixed coil in series with motor and moving coil across the supply
Both fixed coil and moving coil in series with the motor.
What precautions you have to take when disconnecting voltmeter from potential transformers?
Potential transformers secondary terminals which are open should be insulated
Ground the secondary terminals on pen circuit
The terminals of the potential transformer secondary have to be short-circuited
After disconnecting, connect a low resistance shunt between the terminal of the secondary
What you have to do when disconnecting the ammeter from the terminals of the CT?
Earthing the secondary of CT
Short-circuiting the terminals of the CT before disconnecting the ammeter.
Switching a high resistance shunt between terminals of CT after disconnecting the ammeter
Disconnecting primary from supply
With the help of multimeter , we can measure…
Voltage, current, and resistance
Power, energy and power factor
Insulation resistance and A.C current only
Ampere hour capacity and DC current only
Before using an ohmmeter (or a multimeter ) for measuring the resistance
Adjust the pointer to infinity mechanically
Choose appropriate resistance range
Set the pointer to zero by short circuiting its probes by means of a potentiometer
Do all the above.
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