Which of the following instruments has non-linear scale?

1. Moving coil instrument
2. Moving iron instrument
3. Electrostatic instrument
4. Rectifier instrument

Magnetic field intensity has the dimensions

In a digital measuring device the input electrical signal is in the frequency range of dc to ac (Hz. It must be sampled at a rate of

In the wheatstone bridge in figure, each resistance is increased by 0.05%. The value of v₀ will be

In the wheatstone bridge in figure, each resistance is increased by 0.05%. The value of v₀ will be

Consider the following features of an instrument

1. suitable for both ac and dc
2. free from hysteresis and eddy current errors
3. No waveform and frequency errors
4. it is essentially a voltmeter

Assertion (A): Thermocouple instruments can be used for ac only.

Reason (R): Thermocouple instrument has a non linear scale.

Which one of the following effects is used in measuring power?

The effect of lead resistance is important in measurement of

A meter has a resistance of 1 Ω and full scale deflection current of 1 mA. To convert into an ammeter of 1 A range, the shunt resistance should be

The current passing through a resistance of± 0.Ω is 2 ± 0.A. The limiting error in computation of power will be

If A =± 4 and B =±the percentage range of doubt in A - B is

Hay's bridge is suitable for inductances having low L/R ratio.

The most commonly used moving iron instruments are

A high resistance was measured by loss of charge method. The voltmeter resistance was 10¹⁰ ohms. The calculation gave the value of unknown resistance as 0.8 x 10⁹ ohms. The true value of resistance is

Two wattmeter method is suitable only for balanced loads.

A rectifier voltmeter using bridge rectifier and PMMC meter is calibrated to read rms value of sine wave. A triangular wave is applied to it and it reads 6.V. The rms value of triangular wave is

If the secondary burden of a CTVA and secondary current is 5 A, the load impedance of CT is

Consider the following instruments

1. Tangent galvanometer
2. Rayleigh current balance
3. Household energy meter
4. Hot wire ammeter

Two resistance R₁ and R₂ are connected in series R₁ =± 5 Ω and R₂ =± 3Ω. The total resistance will be

The function of shunt in an ammeter is to

An amplifier has to amplify pulses of 1 H-s duration. The minimum bandwidth of amplifier must be

As per BIS, the number of accuracy classes of instrument is

A sinusoidal signal is measured by CRO. The scale is set at 4 mV/cm. If vertical distance between positive and negative peaks is 6 cm, the peak value of ac signal is

Moving iron instrument can be used for ac only.

In electronic voltmeters the measuring device is a

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

A moving iron instrument can be used for

Two voltmeters are each 0-V range. Their internal resistances arekΩ andkΩ They are connected is series and a voltage ofV is applied. Their readings respectively will be

A resistance wire strain gauge has gauge factorIf stress ismega newton/m² and Young's modulus isgiga newton/ m², the percentage change in gauge resistance due to stress is

A radiation thermometer is suitable for temperatures

A 0-voltmeter has a guaranteed accuracy ofof full scale reading. If actual reading isV, the percentage error is

In a CRO, the frequency of output of time base generator

Which of the following does not use the principle of change in inductance?

A moving coil meter has a resistance ofohms and a full scale deflection current ofmA. To convert it into a voltmeter of 0-V range, the series resistance should be

In measuring a resistance by voltmeter-ammeter method, the voltmeter can be connected either across supply or across the resistance. If the resistance is low, the voltmeters should be connected

In most of instruments, the controlling torque is provided by

Wheatstone bridge is suitable for low resistances.

An ammeter has a resistance ofohms and a shunt of 0.Ω. The deflection is θ. If the shunt resistance is increased to 0.Ω, the deflection will be.

A temperature sensistive transducer is subjected to sudden temperature change. It takesseconds for transducer to reach equilibrium condition (five times time constant). The time taken to reach half of temperature difference will be

AV voltmeter has an accuracy of ±of full scale deflection. When the reading isV, the actual voltage

It is necessary to measure the amplitudes of two signals and also the phase difference between them. This can be done by using a

Which of the following methods can be used to measure power in a single phase circuit without using wattmeter?

1. One voltmeter, one ammeter
2. Two voltmeters, two ammeter
3. Three voltmeters
4. Three ammeters

For measurement of surface temperature of solids the elements of RTD is usually in the shape of

A 0-V voltmeter has a sensitivity of 1 kΩ per volt. The resistance of voltmeter is

To avoid creep in an energy meter

A wire strain gauge has a gauge factor ofresistance ofΩ and length 1 m. If length of wire changes by .m, change in resistance will be

In a thermocouple two metal junctions between metals M₁ and M₂ are kept at temperature T₁ and T₂. The thermocouple emf is produced because

DC ampere hour meter is an indicating instrument.

The accuracy of measurement by ohmmeter is very good.