DC voltage of the order of a few mV can be accurately of measured by

Three phase four wire induction energy meter is used to measure

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

Thermistors are made of

In bridge circuit of figure, equivalent resistance between A and B is

Without a spectrum analyser, it is not possible to determine

The Y plates of a CRO are excited by a voltage 2 sint and the X plates are not connected. The display would be

In a platinum RTD, the change in resistance for a temperature rise ofC is about

A phase shifting transformer is used in conjunction with

Heating effect of current is used in

The coils of Drysdale polar potentiometer are wound non-inductively.

The gauge factor of a semiconductor strain gauge is about

Which of the following instruments is used almost exclusively to measure radio frequency currents?

A single phase energy meter operates on induction principle.

In a megger the controlling torque is provided by

A 3-digit voltmeter having a resolution ofmV can be used to measure a maximum of

Assertion (A): A photovoltaic cell is greatly affected by temperature.

Reason (R): Both germanium and silicon can be used for photovoltaic cells.

If E_b is the potential of accelerating anode, the energy of electrons as they emerge from electron gun is proportional to

The coil of a DArsonval galvanometer has N turns. If flux density is B, current is I and area of coil is A, the deflecting torque is

Consider the following statements regarding electromagnetic flowmeter

1. AC excitation is used to avoid polarisation of fluid.
2. The meter calibration is changed as viscosity of fluid changes.
3. Stainless steel pipes can be used for measuring the flow of liquid of high conductivity.

Of the above statements

The accuracy of measurement using CRO is about

The channel required for FM telemetry is

For measurement of high voltage capacitors the suitable bridge is

If the load current is high, the pressure coil of wattmeter should be connected directly across the load.

The material used in RTD is

Wagner earthing device eliminates

An electrostatic voltmeter is suitable for

A moving iron instrument has

A direct current can be measured

Magnetic effect of current is used in

Assertion (A): Absolute instruments are used in standard laboratories.

Reason (R): Absolute instruments do not require calibration.

In measurements using CRO, Lissajous patterns are used to

Basically a potentiometer is a device for

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

The deflection sensitivity of a CRO is generally expressed in

The response of D'Arsonval galvanometer is over damped if

The flow rate of electrically conducting liquid without any suspended particle can not be measured by

While calibrating an ammeter by a dc potentiometer it is necessary to use a standard resistance.

The temperature coefficient of resistance for a thermistor is

Consider the following galvanometers

1. D'Arsonval
2. Ballistic
3. Vibration

Which of these are permanent magnet moving coil instruments?

Assertion (A): Hall effect is observed in all metals but is very appreciable in semiconductors.

Reason (R): Hall effect transducer is very suitable for measurement of magnetic flux density.

Assertion (A): A 3 phase wattmeter consists of two wattmeters mounted in one case.

Reason (R): Power measurement in a 3 phase circuit can be conveniently done by two wattmeter method.

A dynamometer wattmeter is suitable for both dc and ac.

If E_y is the voltage applied to Y plates, the vertical deflection of beam is proportional to

If two time varying signals of equal magnitudes andphase displacement are applied to X and Y plates of CRO, the display will be

The term 'Poisson's ratio' is connected with

To measure an unknown ac voltage by an ac potentiometer it is desirable that supply for the potentiometer is taken

Assertion (A): The trigger circuit of a CRO is excited by the same signal as Y plates.

Reason (R): The time base generator develops a saw tooth voltage.

A data signal having frequency components from dc toHz is to be sent through pulse code modulation using an 8 digit code. The minimum carrier channel bandwidth is

The method of frequency compensation in moving iron voltmeter is