Question # 1

The Step up transformer

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Increase the input current

Increases the input voltage

Has more turns in the primary coil

Has less time in the secondary coil

In a simple D.C. motor the direction of current in the motor is reversed every half revolution to keep the motor turning in the same direction which part of the motor does this.

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Brushes

Coil

Commutator

Poles

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

The ratio of the rms value of the applied voltage to the rms value of resulting A.C. is called.

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Reluctance

Impedance

Reactance

Resistance

A step up transformer has a turn ratio of 1:100 A voltage of 20 V is connected across the primary coil What is the secondary voltage.

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0.2 V

5 V

100 V

2000 V

A charged particles moving in a magnetic field experiences a resultant force.

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Proportional to its K.E.

In the direction of the field

In the direction opposite to its motion

In the direction perpendicular to both the field and its motion

The device in the circuit that consume electrical energy are known as.

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Resistors

Capacitors

Fuses

Load

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

The SI unit of mutual induction a

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Vs-1 A-1

V m -1 A-1

Henry

Tesla

An important application of the semi conductor is the

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Vacuum tube

Fluroescent tube

Copper oxide rectifier

Battery

Which of the following material could be used for a high vacuum, high voltage tube.

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Thoriated tungsten

Tungsten

Copper

Cesium

At which temperature a ferromagnetic material becomes paramagnetic on healing.

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Kelvin temperature

Celsius temperature

Curie temperature

Fahrenheit temperature

On which factor the self induction does not depends upon.

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Number of turns of the coil

the core material

Weight of the coil

Area of the cross section of the coil

What does a dynamo generate

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Electrons

Emf

anion

Cation

If the current in a wire which is placed perpendicular to a magnetic fields increases the force on the wire.

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Increases

Decreases

Remain the same

Will be zero

A bulb of 100 W is connected to a 160 V supply What will be the power consumed.

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25 W

30 W

50 W

64 W

A plug connoted to a table lamp contains a 3 A fuse Why is the fuse needed.

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To increase the resistance of the circuit

To make it easier for the current to flow

To protect the wiring form overheating

To reduce the voltage across thelamp

The field inside a hollow spherical conductor is.

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Constantin zero

Constant but not necessarily zero

A function of charge on sphere

a function of distance from the centre

If the number of coulombs per second through a wire of 10 Ohm resistance across a 120 V line is 12, the current is

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5 A

10 A

12 A

15 A

Electrical energy is transmitted at high alternating voltages which of the following is not a valid reason for doing this.

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At high voltage a.c is safer than d.c.

For a given powers, there is lower current with higher voltage.

There is a smaller energy loss at high voltage and lower current

The transmission lines can be thinner with a lower current.

The magnetic field inside a solenoid is

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Zero

Infinite

Uniform

Non uniform

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