Measurements Lab-Viva 3

In a single phase power factor meter the phase difference between the currents in the two pressure coils is

• Exactly 0°

• Approximately 0°

• Exactly 90°

• Approximately 90°

To measure a resistance with the help of a potentiometer it is

• Necessary to standardize the potentiometer

• Not necessary to standardize the potentiometer

• Necessary to use a volt ratio box in conjunction with the potentiometer

• None of the above

The operating voltage of a Meggar is about

• 6 V

• 12 V

• 40 V

• 100 V

An ohmmeter is a

• Moving iron instrument

• Moving coil instrument

• Dynamometer instrument

• None of the above

An instrument transformer is used to extend the range of

• Induction instrument

• Electrostatic instrument

• Moving coil instrument

• Any of the above

The multiplier and the meter coil in a voltmeter are in

• Series

• Parallel

• Series-parallel

• None of the above

The pressure coil of a wattmeter should be connected on the supply side of the current coil when

• Load impedance is high

• Load impedance is low

• Supply voltage is low

• None of the above

For measurements on high voltage capacitors, the suitable bridge is

• Wien bridge

• Modified De Santy's bridge

• Schering Bridge

• Any of the above

The spring material used in a spring control device should have the following property.

• Should be nonmagnetic

• Most be of low temperature coefficient

• Should have low specific resistance

• All of the above

For handling greater currents induction watt-meters are used in conjunction with

• Potential transformers

• Current transformers

• Power transformers

• Either of the above