Question # 1

The mains frequency in Pakistan is

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20 Hz

50 Hz

40 Hz

60 Hz

Two magnetic lines of force

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Out near the poles

Never cut each other

Cut at a neutral point

Cut according to position of the magnet

In half wave rectifier the rms value of A.C. component of the wave is.

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More than A.C. Value

Less than D.C. value

Same as that of D.C.

Not detectable

Alternating current generator consists of a coil and a pair of.

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Split rings

Slip rings

Metal rings

Copper rings

A number of spherical capacitors of different radii have same potentials The surface charge density on them

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I equal

Is proportional to their radii

Is inversely proportional to their radii

Is inversely proportional to square of their radii

The material of an electromagnet should have high

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Permeability

susceptibility

Retentivity

Hysteresis loss

A straight copper wire a moved in a uniform magnetic field such that it cuts the magnetic lines of force then.

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emf will not be induced

emf will beinduced

sometimes emf will be induced and sometimes not

The number of turns iin the coil increases

A generator running in reverse may be called as.

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A.C. Generator

D.C. generator

Motor

Commutator

What is the traditional name for a capacitor

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Choke

Condenser

Transformer

Inductor

Under which of the following conditions current in a circuit is wattles.

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When inductance in the circuit is zero

When resistance in the circuit is zero

When current is alternating

When resistance and inductance both are zero

The circuit in which current and voltage are in phase the power factor is.

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Zero

Unity

Double

4 times

At series resonance in L-C-R circuit the impedance is equal to.

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Ohmic resistance

Inductive reactance

Capacitive reactance

Inductive reactance minus capacitive reactance

Capacitance is directly proportional to

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Distance between the plates

Di electric strength

Area of the plates

Charge multiplied by the applied voltage

_{When a charged particle moves through a magnetic field it suffers a change in its}

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Charge

Mass

Energy

Direction of motion

Which one fo the following is based on the diffraction and repulsion of electric charge.

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Capacitor motor

Transformer

Induction motor

synchronous motor

Why choke coil is used in an AC circuit.

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To decrease D.C.

To increases A.C.

To decreases A.C

To increase D.C

Which electrical component uses a low current circuit to switch a high current ON or OFF.

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Capacitor

Diode

Reed rely

Thermistor

Static electricity occurs when

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two metals are connected to a battery

Different insulators are rubbed together

The weather is very humid

Different conductors are rubbed together

Capacitance is define das

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VC

Q/V

QV

V/Q

In any L-C-R circuit

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Current lags the applied voltage

Current leads the applied voltage

Current sometimes leads and sometimes lags the applied voltage

Current remains in phase with voltage

Where is the velocity of electrons maximum in a diode.

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Near the cathode

Near the anode

In the space ini between the two elecrode.

It is same throughout the tube

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