Question # 1

What is the range of values of power factor.

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0 to -1

0 to +1

0 to 2

2 to 3

In which device is a permanent magnet used

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An electric bell

An electromagnet

A plotting compass

A relay

How the fuse wire in electric supply line is connected to protect the electrical appliances.

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In parallel

In sereis

In mixed order

In vertical position

In the concept of magnetic circuit, the quantity analogous to resistance in Ohm's law is.

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Reactance

Dipole

Impedence

Reluctance

An important application of the semi conductor is the

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Vacuum tube

Fluroescent tube

Copper oxide rectifier

Battery

When a conductor situated in a dielectric is charted the energy resides.

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Only on the dielectric

Only on medium surrounding charge

On the dielectric and medium both

Only on the type of the charge

Which of the given factors is increased in a step down transformer.

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Voltage

Current

Wattage

Resistance

Wattles current is said to flow when phase angle between virtual current and virtual voltage is

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0^o

90 ^o

180 ^o

270^o

What is the traditional name for a capacitor

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Choke

Condenser

Transformer

Inductor

In a purely inductive circuit, the current

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Lags behind the emf by 90^o

Leads the emf by 90 ^o

Is in phase with emf

May lag or lead the emf

A dry battery can deliver 3,000 J energy to a small 2 W electric motor before the battery is exhausted for how minutes does the motor run.

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20 minutes

25 minutes

75 minutes

125 minutes

Artificial polymers are made by a chemical reaction known as.

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Crystallization

Electroplating

Polymerization

Polarization

Electricity is transmitted at high voltage rather than at low voltage because.

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It is generated at high voltage

It is safer

It requires less insulation

It wastes less energy

Which of the following quantity in analogous to temperature in electricity.

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Charge

Resistance

Inductances

Potential

In an induction coil, the secondary emf is.

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Zero at the break of the circuit

Zero during make of the circuit

Very high during make of the circuit.

Very high during break of the circuit

In gases, the charge carriers are.

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Atoms

Molecules

Electrons only

Ions and electrons

In a parallel resonant circuit, at resonance

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Current is maximum

Voltage is maximum

Impedance is minimum

Impedance is zero

If we use two diodes and a centre tapped transformer we will get.

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A transistor

An amplifier

A half wave rectifier

A full wave rectifier

The basic circuit element is a D.C. circuit is

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An inductor

A resistor

A capacitor

A battery

Which current can pass through a capacitor continuously.

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Alternating current

Direct current

Eddy current

Pulsating current

Self inductances of solenoid is

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Directly proportional to the current flowing through the wire

Directly proportional to its length

Inversely proportional to area of corss section

Directly proportional to number of turns

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