In an RC circuit, when the switch is closed, the response

For a consumer, the most economical power factor is generally

When the interconnector between two stations is proportional to the current in that winding because

Synchronizing power of a synchronous machine is:

Experiment A uses a test charge -2q to measure an electric field produced by stationary charges. A finds a field that is

The most efficient form of damping employed in electrical instruments is:

Which of the following is an essential requirement for a peak load plant?

“The sum of the currents into a junction equals to sum of the currents out of the junction” is a consequence of

Which of the following is not a method of measuring the slip of an induction motor?

Magnetization vectors in neighboring ferromagnetic domains are:

It is hereby declared unlawful for any person, whether natural or judicial, public or private, to:

As compared to shunt and compound motors, a series motor has the highest torque because of its comparatively ___ at the start

An LC series current with an inductance L and capacitance C has an oscillation frequency F. Two inductors, each with inductance L and 2 capacitors, each with capacitance C, are all wired in series and the circuit is completed. The oscillation frequency is:

If a circuit has L closed loops, B branches and J junctions, the number of independent loop equations is

Which of the following types of motor is used in electric toys?

A bar magnet is broken in half. Each half is broken in half again, etc. The observation is that each piece has both a north and south pole. Thus, usually explained by:A bar magnet is broken in half. Each half is broken in half again, etc. The observation is that each piece has both a north and south pole. Thus, usually explained by:

Maximum demand of an installation is given by its

The ordinary efficiency of a given transgormer is maximized when

The 3-phase induction motor is so designed that the rotor should have

Corona usually occurs when the electrostatic stress in air around the conductor exceeds

The behavior of ferromagnetic domains in an applied magnetic field gives rise to:

The units of electric field are

The torque exerted by an electric field dipole is:

A charged capacitor and an inductor are connected in series. At time t=0 the current is zero, but the capacitor is charged. If T is the period of the resulting oscillation, the next time after t=0 that the energy stored in the electric field of the capacitor is a maximum is

The primary function of a clamper circuit is to:

A magnet moves inside a coil. Consider the following: I. Strength of the magnet II. Number of turns in the coil III. Speed at which the magnet moves Which can affect the emf induced in the coil?

The outer surface of the cardboard center of a paper towel roll:

For any circuit the nunber of independent equations containing emf’s, resistance and currents equals

Which is the core losses are negligible during a short-circuit test conducted on transformer?

Which of the following power plants cannot be used as base load plant?

In the context of the lood and junction tules for electrical circuits, a junction is

For an unbalanced load, which connection is suitable?

If the height of the transmission tower is increased

The impedance of an RLC series circuit is definitely increased if:

In a sinusoidally driven seriec RLC circuit, the inductive reactance is XL = 200 ohms, the capacitive reactance is XC = 100 ohms and the resistance is R = 50 ohms. The current and applied emf would be in phase if

Ferromagnetism is closely associated with

If there is one power plant only, the installed capacity of that power plant should be equal to

The unity “henry” is equivalent to

When a live conductor of public electric supply breaks down and touches the earth which of the following will happen?

The molecular theory of magnetism can explain each of the following EXCEPT:

A three phase transmission line is 30 km long. The outside diameter of the conductor is 0.721 inch and has an equilateral spacing of 4 ft. Determine the capacitance per phase of the line

A parallel plate capacitor with plates of area A that are separated a distance d by air is initially charged with charge qc. The energy stored in the capacitor initially is E. The plates are then separated by 2d. What is the new energy stored in the capacitor?

What is the period of oscillation of the position given as x(t) = -0.25 cos 16.05t

An electron traveling north enters a region where the electric field is uniform and points north

Large capacity generators are invariably

When a dc motor has no load, what will happen to the back emf?

If source impedance is complex, then maximum power transfer occurrs when thbload impedance is ______ the source of impedance.

As compared to constant-current system, the constant-voltage system of charging a lead-acid cell has the advantage of:

Which of the following is not a method of measuring the slip of an induction motor?

_______ bridge is used for measuring an unknown inductance in terms of a known capacitance and resistance.

A battery has an emf of 9 V and an internal resistance of 2W. If the potential differences across its terminal is greater than 9 V

The system supplying base and peak loas will be more economical if power is supplied by

If the system is a three-wire system the currents flowing towards the load in the three lines must add to ___ at any given instant

A toroid with a square cross section carries current i. The magnetic field has its largest magnitude

Which of the following is preferred when quick speed reversal is the main consideration

Calculate the magnetic field intensity to produce a flux density of 10 x 10-3 tesla at the center of a long straight solenoid

The magnetic dipole moment of an atomic electron is typically:

A coil has a resistance of 5 ohms and an inductance of 1H. At t=0, it is connected to a 2V battery. Find the rate of rise of current when i=0.2 ampere

The maximum torque by dc motors is limited by:

During the charging of a lead-acid cell:

The starting torque of an induction motor is macimum when rotor resistance per phase is ____ to roto reactance/phase

Silica gel prevents air moisture from entering the outdoor transformer tank. It is placed on

The energy of a magnetic dipole in an external magnetic field is least when:

Faraday’s Law states that an induced emf is proportional to the

Which of the following statements about induction motor is FALSE

1 weber is the same as:

The magnetic torque exerted on a flat current-carrying loop of wire by a uniform magnetic field B is

A three phase transposed distribution line is designed with equilateral spacing of 12 ft. It is decided to build the line with horizontal spacing (D13=2D12=2D23). The conductors are transposed. What should be the spacing between adjacent conductors in order to obtain the same inductance as in the original design?

Recombination takes place when:

A generating station is to supply four regions of load whose peak loads are 10 MW, 5 MW, 8 MW, 7 MW. The diversity factor is 1.5 and the average annual load factor is 60. Calculate the annual energy supplied by the station

The RMS value of an ac current is

An initially uncharged capacitor C is connected in series with resistor R. This combination is then connected to a battery of emf V. Sufficient time elapses so that a steady state is reached. Which of the following is not true?

Which of the following dc motor would be suitable for drivers requiring high starting torque but only fairly constant speed such as crushers

Magnetization is

The electric field in unpolarized light:

Tall growing plants refer to plants, vines and other plants species, which grow or have the potential to grow more than ___ in height from the ground

The main disadvantage of Hopkinson’s test for finding efficiency of shunt dc motor is that it

What kind of rotor is most suitable for turbo-alternator which are designed to run at high speed?

The magnitude of the Bohr magneton in J/T is about:

If the air gap between the rotor and stator of a 3-phase induction motor is increases, then

The soeed of s squirrel cage induction motor is changed by

Ward-Leonard system of speed control is not recommended for:

Of the following. The copper conductor that has the least resistance is

The unit of absolute permittivity of a medium is:

You wish to triple the rate of energy dissipation in a heating device. To do this you could triple

If an intrinsic semiconductor is doped with a very small amount of boron, then in the extrinsic semiconductor so formed, the number of electrons and holes will

The chief advantage of Ward-Leonard system of dc motor speed control is that is

A 0-1 mA meter has a sensitivity of

An isolated charged point particle produces an electric field with magnitude E at a point 2 m away from the charge. A point at which the field magnitude is E/4 is:

The transient voltage that appears across the contacts at the instant of arc extinction is called

Paramagnetism is closely associated iwth

Which material is used in liquid type of fuse?

In a dc motor, the mechanical output power actually comes from

For Zl = Zs, what is the relation between Xl and Xs

If the potential differences across a resistor is doubled

In practice, regenerative braking is used when

A synchronous condenser is virtually which of the following?

Two thin spherical shells, one with radius R and the other with radius 2R, surround an isolated charged point particle. The ratio of the number of field lines through the larger sphere to the number through the smaller is:

A device that repeatedly reverses the polarity of a magnetic field in order to keep a dc motor rotating is known as:

A golf ball is struck by a golf club and falls on a green three meters above the tee. The potential energy of the earth-ball system is greatest