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 Eb 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
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
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 Ey 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
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