Explore topic-wise MCQs in Engineering.

In a radio receiver, if the intermediate frequency is too high

Which of the following oscillator is generally not used at VHF?

In a receiver, which of the following device has IF input but RF output?

Transistor are free from which type of noise?

The minority carrier life time and diffusion constant in a semiconducting material are 100 s and 100 cm²/s respectively. The diffusion length of carriers is

Two materials having temperature coefficients of 0.004 and 0.0004 respectively are joined in series. The overall temperature coefficient is likely to be

Assertion (A): Electronic and Ionic polarization in a polyatomic gas are independent of temperature.

Reason (R): The orientation polarization is independent of temperature.

The core of a coil has a length of 10 cm. The self inductance is 8 mH. If the core length is doubled, all other quantities remaining the same, the self inductance will be

To increase Q factor of a coil, the wire should be

An ammeter of 0-25 A range has a guaranteed accuracy of 1% of full scale reading. The current measured is 5 A. The limiting error is

Which capacitor-store higher amount of energy?

The coil of a moving iron instrument has a resistance of 500 Ω and an inductance of 1 H. It reads 250 V when a 250 V dc is applied. If series resistance is 2000 Ω, its reading when fed by 250 V, 50 Hz ac will be

In 3 phase power measurement by two wattmeter method, the reading of one wattmeter is zero. The power factor of load is

Diamond is a paramagnetic material.

In paramagnetic materials

Above ferroelectric curie temperature, spontaneous polarization in ferroelectric materials becomes stronger.

Assertion (A): Atomic number of sodium is 11.

Reason (R): Sodium has a body centred cubic lattice.

When a current source I is suddenly connected across a two terminal relaxed RC circuit at time t = 0, the voltage across the current source is shown in figure. The RC circuit is

The driving-point impedance Z(s) of a network has a pole-zero locations as shown in the figure. If Z(0) = 3, then Z (s) is

and i(t) is a unit step, then V(t) in the steady state is given by

The terms RMS and average values apply only to sine waves.

A dynamometer wattmeter is connected in ac circuit. The measured power is

Which of the following are needed both for protection and metering?

Which of the following measurements using a dc potentiometer do not require standardisation of potentiometer?

For a transmission line open circuit and short circuit impedances are 20 Ω and 5 Ω. Then characteristic impedance is

Loss of charge method is suitable for medium resistances.

A digital frequency counter can be converted to DVM by addition of a suitable

The speed transducer using a drag cup rotor has the main advantage of

A voltmeter using thermocouples measures

In two wattmeter method of 3 phase power measurement, when does one wattmeter read negative

It is required to measure angular position. Out of the transducers

1. Circular potentiometer
2. LVDT
3. E pick up
4. Synchro

A dynamometer wattmeter is connected in ac circuit. The reading will be

In figure, Z₁ = 200 60 Ω, Z₂ = 400 - 90 Ω, Z₃ = 300 0 . Then Z₄ for bridge to be balanced is

In figure the bridge is balanced when Z₄ is

A full wave rectifier type meter is used to measure the wave shape shown in figure. The voltmeter is calibrated to read rms value of sine wave. The reading of voltmeter will be

A moving coil instrument has a resistance of 0.5 Ω and a full scale deflection of 0.1 A. To convert it into an ammeter of 0-10 A the shunt resistance should be

Potentiometer method of dc voltage measurement is more accurate than direct measurement using a voltmeter because

Assertion (A): A hot wire ammeter has a cramped scale.

Reason (R): The heat is proportional to square of current.

A single phase energy meter has the rating 1200 resolutions/ kWh. If a 500 W electric gadget is used for 4 hours, the energy meter will make

Which of the following is true about an impulse voltage?

The angle for a mica capacitor is about

A digital voltmeter has a read out range from 0 to 999 counts. If the full scale reading is 9.999 V, the resolution is

The coil of a moving coil meter has 100 turns, is 40 mm long and 30 mm wide. The control torque is 240 x 10^-6 N-m on full scale. If B = 1 Wb/m², range of meter is

Consider the following statements: In a differential amplifier using JFET, the differential output offset is due to

1. mismatch between FET parameters
2. difference in values of resistances used in circuit
3. variation in supply voltage.

A meter with a resistance of 100 Ω and a full scale deflection of current of 1 mA is to be converted into voltmeter of 0 - 5 V range. The multiplier resistance should be

In a resistance strain gauge, G = 2, stress = 1050 kg/cm², R = 1000 Ω. The value of R will be

The household energy meter is

A standard cell of 1.0185 V is used with a slide wire potentiometer. The balance was obtained at 60 cm. When an unknown emf was connected, the balance was obtained at 82 cm. The magnitude of unknown emf is

In a strain measuring device using a strain gauge, the output quantity is

As per BIS there are 6 accuracy classes of instruments.