The use of _____ instruments is merely confined within laboratories as standardizing instruments.

Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?

_____ instruments are those which measure the total quantity of electricity delivered in a particular time.

Which of the following are integrating instruments ?

Resistances can be measured with the help of

ccording to application, instruments are classified as F. both D and E

Which of the following essential features is possessed by an indicating instrument ?

A _____ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly

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

Which of the following properties a damping oil must possess ?

A moving-coil permanent-magnet instrument can be used as _____ by using a low resistance shunt.

A moving-coil permanent-magnet instrument can be used as flux-meter

Which of the following devices may be used for extending the range of instruments ?

An induction meter can handle current up to

For handling greater currents induction wattmeters are used in conjunction with

Induction type single phase energy meters measure electric energy in

Most common form of A.C. meters met with in every day domestic and industrial installations are

Which of the following meters are not used on D.C. circuits

Which of the following is an essential part of a motor meter ?

A potentiometer may be used for

is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another,

The household energy meter is

The pointer of an indicating instrument should be

The chemical effect of current is used in

In majority of instruments damping is provided by

An ammeter is a

In a portable instrument, the controlling torque is provided by

The disc of an instrument using eddy current damping should be of

The switch board instruments

The function of shunt in an ammeter is to

The multiplier and the meter coil in a voltmeter are in

The scale of a rectifier instrument is

For measuring current at high frequency we should use

The resistance in the circuit of the moving coil of a dynamometer wattmeter should be

A dynamometer wattmeter can be used for

An induction wattmeter can be used for

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

In a low power factor wattmeter the pressure coil is connected

In a low power factor wattmeter the compensating coil is connected

In a 3-phase power measurement by two wattmeter method, both the watt meters had identical readings. The ower factor of the load was

In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The ower factor of the load must be

The adjustment of position of shading bands, in an energy meter is done to provide

An ohmmeter is a

For measuring a very high resistance we should use

The electrical power to a meggar is provided by

In a meggar controlling torque is provided by

The operating voltage of a meggar is about

Murray loop test can be used for location of

Which of the following devices should be used for accurate measurement of low D.C. voltage ?

It is required to measure the true open circuit e.m.f. of a battery. The best device is

A voltage of about 200 V can be measured

A direct current can be measured by

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

A phase shifting transformer is used in conjunction with

Basically a potentiometer is a device for

In order to achieve high accuracy, the slide wire of a potentiometer should be

To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken

The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a

In an AC. co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be (6) out of phase by 60°

A universal RLC bridge uses

For measurements on high voltage capacitors, the suitable bridge is

In an Anderson bridge, the unknown inductance is measured in terms of

Wagner earthing device is used to eliminate errors due to

For measurement of mutual inductance we can use

For measurement of inductance having high value, we should use

If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is

In a Schering bridge the potential of the detector above earth potential is

To avoid the effect of stray magnetic field in A.C. bridges we can use

A power factor meter has

The two pressure coils of a single phase power factor meter have

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

In a dynamo meter 3-phase power factor meter, the planes of the two moving coils are at

In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of

In a Weston frequency meter, the magnetic axes of the two fixed coils are

A Weston frequency meter is

A Weston synchronoscope is a

In a Weston synchronoscope, the fixed coils are connected across

In Weston synchronoscope the moving coil is connected across

The power factor of a single phase load can be calculated if the instruments available are

The desirable static characteristics of a measuring system are

The ratio of maximum displacement deviation to full scale deviation of the instrument is called

Systematic errors are

Standard resistor is made from

Commonly used standard capacitor is

Operating torques in analogue instruments are

Commonly used instruments in power system measurement are

Damping of the Ballistic galvanometer is made small to

If an instrument has cramped scale for larger values, then it follows

E.m.f. of a Weston cell is accurately measured by

A sensitive galvanometer produces large deflection for a

A multirangq instrument has

The rectifier instrument is not free from

Alternating current is measured by

Most sensitive galvanometer is

. Instrument transformers are

. An instrument transformer is used to extend the range of

. Wattmeter cannot be designed on the principle of

. In an energy meter braking torque is produced to

. Various adjustments in an energy meter include

. The power of a n-phase circuit can be measured by using a minimum of

. Two holes in the disc of energy meter are drilled at the opposite sides of the spindle to

. Which of the following is measured by using a vector voltmeter ?

. The principle on which vector voltmeter is based is

. To measure radio frequency, the suitable frequency meter is