## electrician

### MCQ ON MEASURING INSTRUMENT PAGE - 5

1.
 How the PF meter is connected in the motor circuit A Fixed coil in parallel with the supply and moving the coil in series with single phase motor B Fixed coil across the motor and moving coil across the supply C Fixed coil in series with motor and moving coil across the supply D Both fixed coil and moving coil in series with the motor. Answer : A Explanation :
2.
 What precautions you have to take when disconnecting voltmeter from potential transformers? A Potential transformers secondary terminals which are open should be insulated B Ground the secondary terminals on pen circuit C The terminals of the potential transformer secondary have to be short-circuited D After disconnecting, connect a low resistance shunt between the terminal of the secondary Answer : A Explanation :
3.
 What you have to do when disconnecting the ammeter from the terminals of the CT? A Earthing the secondary of CT B Short-circuiting the terminals of the CT before disconnecting the ammeter. C Switching a high resistance shunt between terminals of CT after disconnecting the ammeter D Disconnecting primary from supply Answer : B Explanation :
4.
 With the help of multimeter , we can measure… A Voltage, current, and resistance B Power, energy and power factor C Insulation resistance and A.C current only D Ampere hour capacity and DC current only Answer : A Explanation :
5.
 Before using an ohmmeter (or a multimeter ) for measuring the resistance A Adjust the pointer to infinity mechanically B Choose appropriate resistance range C Set the pointer to zero by short circuiting its probes by means of a potentiometer D Do all the above. Answer : D Explanation :