Question: In a portable instrument, the controlling torque is provided by_____________?

• 1. spring
• 2. gravity
• 3. eddy currents
• 4. all of the above

Question: In majority of instruments damping is provided by______________?

• 1. fluid friction
• 2. spring
• 3. eddy currents
• 4. all of the above

Question: The disc of an instrument using eddy current damping should be of________________?

• 1. conducting and magnetic material
• 2. non-conducting and magnetic material
• 3. conducting and non-magnetic material
• 4. none of the above

Question: The function of shunt in an ammeter is to______________?

• 1. by pass the current
• 2. increase the sensitivity of the ammeter
• 3. increase the resistance of ammeter
• 4. none of the above

Question: A potentiometer may be used for_________________?

• 1. measurement of resistance
• 2. measurement of current
• 3. calibration of ammeter
• 4. all of the above

Question: The chemical effect of current is used in ______________?

• 1. D.C. ammeter hour meter
• 2. D.C. ammeter
• 3. D.C. energy meter
• 4. none of the above

Question: For handling greater currents induction wattmeters are used in conjunction with______________?

• 1. potential transformers
• 2. current transformers
• 3. power transformers
• 4. either of the above

Question: is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another_______________?

• 1. Tangent galvanometer
• 2. Meggar
• 3. Current transformer
• 4. None of the above

Question: Induction type single phase energy meters measure electric energy in_______________?

• 1. kW
• 2. Wh
• 3. kWh
• 4. VAR

Question: A moving-coil permanent-magnet instrument can be used as flux-meter_____________?

• 1. by using a low resistance shunt
• 2. by using a high series resistance
• 3. by eliminating the control springs
• 4. by making control springs of large moment of inertia