When a very small amount of higher conducting metal is added to a conductor, its conductivity will 

An electrically balanced atom has 30 protons in its nucleus and 2 electrons in its outermost shell. The materials made of such atom is

The temperature coefficient of resistance of a doped semiconductor is

In the slice processing of an integrated circuit

Permanent magnet loses the magnetic behaviour when heated because of
1. atomic vibration
2. dipole vibration
3. realignment of dipoles
Which of the above are correct?

A Zener regulator has an input voltage varying between 20 V and 30 V. The desired regulated voltage is 12 V, while the load varies between 140  and 10k  The maximum resistance in series with the unregulated source and Zener diode would be

A short in any type of circuit (series, parallel or combination) causes the total circuit
1. resistance to decrease
2. power to decreases
3. current to increase
Which of the above are correct?

An air-cored solenoid of 250 turns has a cross-sectional area A = 80 cm² and length l = 100 cm. The value of its inductance is

The current in a coil changes uniformly from 10 A to 1 A in half a second. A voltmeter connected across the coil gives a reading of 36 V. The self-inductance of the coil is

In a mutually coupled circuit, the primary current is reduced from 4A to zero in 10 s.  A voltage of 40000 V is observed across the secondary. The mutual inductance between the coils is

A semiconductor differs from a conductor in that it has

Which of the following circuits is used for converting a sine wave into a square wave?

Which of the following elements of electrical engineering cannot be analyzed using Ohm’s law ?

Consider the following statements: A power supply uses bridge rectifier with a capacitor input filter. If one of the diodes is defective, then
1. The dc load voltage will be lower than its expected value
2. Ripple frequency will be lower than its expected value
3. The surge current will increase considerably
Which of the above statements are correct?

Three identical amplifiers each having a voltage gain of 50 are cascaded. The open loop voltage gain of the combined amplifier is

If a square matrix of order 100 has exactly 15 distinct eigenvalues, then the degree of the minimum polynomial is 

For high speed reading and storing of information in a computer, the core shall be of 

Soft magnetic materials should have 

Orbital magnetic moment of an electron, in an atom, is of the order of 

When the temperature of a ferromagnetic material exceeds the Curie temperature, it behaves similar to a 

Assuming both the voltage sources are in phase, the value of R for which maximum power is transferred from circuit A to circuit B is

For the intrinsic gallium-arsenide, the conductivity at room temperature 25°C is 10^-6 (ohm-m)^-1, the electron and hole nobilities are 0.85 m²/V-s and 0.04 m²/V-s respectively. What is the intrinsic carrier concentration at the room temperature?

The resistivity of intrinsic germanium at 30°C is 0.46 –m. What is the intrinsic carrier density at 30°C if the electron mobility is 0.38 m²/V-s and the hole mobility is 0.18 m²/V-s?

Heat conduction in a semiconductor takes place

Brewster angle is the angle when a wave is incident on the surface of a perfect dielectric at which there is no reflected wave and the incident wave is

Resistance switching is normally resorted in case of

By transmitting power at high voltage

Which statement about the daily load curve is valid ?

High voltage Schring bridge is used to measure

Draw - in - system of laying underground cables has the drawback (s) of

Surge impedance of a transmission line is

If two synchronous generators connected in parallel loose synchronism, it will lead to

A differential relay responds to

The conductor carries more current on the surface in comparison to its core. This phenomenon is called the

A booster is connected in

Fuses have got advantages of

The power transmitted will be maximum when

The connected load of a consumer is 2 kW and his maximum demand is 1.5 kW. The load factor of the consumer is

In a transformer, the exciting current will be in phase quadrature with the impressed voltage provided

Which of the following techniques is used for the measurements of a.c. high frequency voltages ?

Use of additional shunt capacitor can be made for increasing the capability of line as it

The sag of a transmission line is least affected owing to

In case of Impulse Thermal break down of solid insulating materials, the critical electric field is proportional to

The insulation of the modern EHV lines is designed based on

For constant voltage transmission, the voltage drop along the line is maintained constant by installing

AC network analyser is employed for solving the problems of

The change in excitation in an alternator connected to an infinite line provides a corresponding change in

Different types of insulators used for transmission lines are

The conductor connecting consumer's terminals to the distributor is called the

Which of the following method or techniques can be used for the measurement of high d.c. voltages ?