Explore topic-wise MCQs in Electrical Engineering Questions.

In the given options, the secondary fundamental unit is

Plane angle and solid angle are

By the surface, the solid angle subtended at the centre of a sphere, whose area is equal to the surface of the radius of the sphere is known as

In electrostatic voltmeters, the principle of their operation is the force of attraction between electric charges on neighboring plates between which potential difference is maintained. The attracted-disc type electrostatic instruments are used for the measurement of

Swamping resistance is a resistance made up of

At the centre, the plane angle subtended by an arc of a circle equal to the radius of the circle is known as

Electrostatic voltmeter instruments are suitable for

A Kelvin’s multicellular voltmeter has a torsion head and a coach spring for

Electrostatic instruments are generally used as

The heater wire of thermocouple instruments are made of smaller area of cross section to

Induction type instruments are generally used as

The thermocouple ammeter scale is

Electrodynamic instruments can be used as

A cylindrical type with split phase winding induction ammeters employs

The deflection angle in hot wire instruments is

In induction voltmeter, split phase windings are obtained by connecting a

The scale of electrodynamic instrument when it is used as ammeter and when it is used as voltmeter is

In an electrodynamic instrument, the number of control springs present is / are

Hot-wire instruments are suitable for

The current sensitive instruments are

A current of 2 + 3sinωt A is passed through a moving iron instrument and through a PMMC meter respectively. The readings of the two meters are

The ratio of maximum current (with shunt) to the full scale deflection current (without current) in a permanent magnet moving coil instrument is known as

The multiplying factor of a PMMC used as ammeter is

The voltage multiplication factor of a PMMC instrument is

For extending the range of 0-150 V to 0-500 V in a 10000 Ω/V meter, the value of series resistance required is equal to

What will a moving iron ammeter read if a rectangular waveform current with peak value of 120 mA is passed through it?

A moving iron instrument is used as an ammeter. Its range can be extended by using

In a hot wire ammeter the current flowing through the resistance of 10Ω is given by I = 3 + 2sin300t A The measured value of current will be

To convert a 2 mA meter with internal resistance of 120 ohm into an ammeter of range 0 – 200 mA, the value of shunt resistance required is

The scale of PMMC type instruments is

The instrument which can be used only with the d.c. supply is

In a permanent magnet moving coil instrument, the deflecting torque is

The instrument which can be used only with the a.c. supply is / are

In a hot wire instrument, readings are

A deflection of 90 degree is produced when a current of 10 A flows through the circuit and the torque of the ammeter vary as the square of the current through it. If a current of 8 A flows through it, then the deflection obtained when the instrument is spring controlled and when the instrument is gravity controlled are

The gravity controlled instruments has to be kept

Integrating instruments is the subdivision of the secondary instruments. The example for integrating instruments is

The true power measured by the wattmeter whose range is 500 W and an error of ± 2% of full scale deflection is 150 W. The relative error while reading 150 W will be

In the absence of the restoring torque, the pointer

While measuring resistance by the voltmeter-ammeter method, the maximum possible percentage error in the voltmeter and ammeter are ± 1.8% and ± 1.2% respectively. Then the maximum possible percentage error in the value of resistance will be

The electromagnetic effect is generally utilized for

The electrostatic effect is utilized for

The moving system in the indicating instruments is subjected to

If the deflection torques on moving system increases then the controlling torque

Backlash is commonly experienced in gear sets used to convert between translational and rotational motion. Backlash is a typical cause of

If the two voltage measurements are V1 = 150 ± 2% and V2 = 100 ± 4% respectively. Then the maximum percentage error in the sum of two voltage measurements is

A zero order system is the one in which output changes instantaneously as the input changes. The example of zero order system is

Resolution of an instrument is specified as

In a moving coil voltmeter, the input resistance of the meter can be increased by

For a second order instrument if the value of the damping ratio is equal to zero, then the