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

A clamper circuit
1. Adds or subtracts a dc voltage to or from a waveform
2. Does not change the shape of the waveform
Which of the above statements are correct? 

If a carrier of 100% modulated AM is suppressed before transmission, the power saving is nearly

When the modulating frequency is doubled the modulation index is halved and the modulating voltage remains constant. This happens when the modulating system is

The four basic elements in a PLL are loop filter, loop amplifier, VCO and

In a frequency modulated (FM) system, when the audio frequency is 500 Hz and audio frequency voltage is 2.4 V, the frequency deviation is 4.8 kHz. If the audio frequency voltage is now increased to 7.2 V then what is the new value of deviation?

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 

What is the correct sequence of the following materials in ascending order of their resistivity ?
1. Iron
2. Silver
3. Constantan
4. Mica
5. Aluminium
Select the correct answer using the codes given below : 

In the first Cauer network, with a pole at infinity, the first element must be

The total magnetic moment
1. is called saturation magnetization.
2. depends on the number of magnetic dipoles per unit volume, the instant electric current and the area of the current loop.
Which of the above statements is/are correct ? 

Susceptibility of a diamagnetic material is 1. Negative
2. Positive
3. Dependent on the temperature
4. Independent of the temperature 

Superconductivity is a material property associated with 

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

An electrical breakdown of a p-n junction occurs if

The chief deterrent to the widespread application of superconducting materials is

Which one of the following properties is not observed in the carbon nanotubes ?

The evidence for the importance of electron-phonon interaction in super-conductors comes from

Which one of the following materials is used for cable insulation ?

For high speed reading and storing of information in a computer, the material used is

The temperature above which an anti-ferromagnetic material becomes paramagnetic is called

Which effect is the converse of Peltier effect ?

Magnetic materials which may be readily magnetized in either direction are

Consider the following statements regarding a ferromagnetic material:
1.Below the ferromagnetic Curie temperature, the ferromagnetic materials exhibit hysteresis effect.
2.The coercive force is the filed required to reduce the flux density to zero. 
Which of the above statements is/are correct?

The impact ionization phenomenon in semiconductor may be viewed as the reverse process of

Refractive index of a slice glass can be reduced by doping it with tiny amount of

If a diameter of a copper wire is increased by two times keeping its terminal voltage same, then the drift velocity will

In an induction type energy meter, the steady speed attained by the rotating disc is
1.Proportional to the deflecting torque.
2.Proportional to the resistance of the path of eddy currents.
3.Inversely proportional to the effective readings of disc from its axis.
4.Inversely proportional to the square of brake magnetic flux. 
Which of the above are correct?

If ‘KCLFTSB’ stands for ‘best of  luck’ and ‘SHSWDG’ stands for ‘good wishes’, which of the following indicates ‘ace the exam’?

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 ?

The ripple voltage in dc output is small if

The voltage measurements using uniform spark gap are

Neutral earthing is provided for

The function of Lightning arrester is

In which of the following cases are delay fuses used ?

In order to improve the voltage profile of the line, compensation is resorted by providing

Skin effect in conductor is proportional to

The function of steel wire in an ACSR conductor is to

A fault is more severe from the view point of RRRV if it is a

Protective resistance to be connected between the sphere gap and the test equipment is required while measuring

Series capacitor is used in a transmission line to

The passive element that is used as interconnecting element for the stable operation of interconnected system is

Corona loss in a transmission line is dependent on

In a minimum oil circuit breaker the oil is used

Skin effect is

Rated making capacity of breaker is equal to

The main reason for using high voltage for long distance power transmission is

Bus - coupler is very essential in

With the rise in temperature, the insulation resistivity

The effect of bonding the cable is

Increase in temperature in overhead transmission lines causes

The insulation resistance of the cable decreases with the

Corona has the disadvantage(s) of

In a load duration curve for an intergrated power system the uppermost crest represents the energy contributed by

At bridge crossing and near the railway track ternary lead cables are used because they