Explore topic-wise MCQs in Electrical Engineering.

Bulbs in street lighting are all connected in

Resistance of carbon filament lamp as the applied voltage increases.

When electric current passes through a bucket full of water, lot of bubbling is observed. This suggests that the type of supply is

In the case of direct current

Resistance of 220 V, 100 W lamp will be

Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct ?

In a lamp load when more than one lamp are switched on the total resistance of the load

When one leg of parallel circuit is opened out the total current will

It becomes more difficult to remove

Whether circuit may be AC. or D.C. one, following is most effective in reducing the magnitude of the current.

A glass rod when rubbed with silk cloth is charged because

Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as

When electric current passes through a metallic conductor, its temperature rises. This is due to

If the efficiency of a machine is to be high, what should be low ?

Resistance of a material always decreases if

Electric current passing through the circuit produces

Resistance of a tungsten as applied voltage increases

An electric filament bulb can be worked from

In an electric kettle water boils in 10 minutes. It is required to boil the boiler in 15 minutes, using same supply mains

A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will

Which of the following quantities remain the same in all parts of a series circuit ?

The thickness of insulation provided on the conductor depends on

Heat in a conductor is produced on the passage of electric current due to

The hot resistance of the bulb's filament is higher than its cold resistance because the temperature co-efficient of the filament is

A closed switch has a resistance of

What will be energy used by the battery if the battery has to drive 6.28 x 1018 electrons with potential difference of 20 V across the terminal ?

Two resistances Rl and R2 are connected in series across the voltage source where R2>R1. The largest drop will be across

The four bulbs of 40 W each are connected in series with a battery across them, which of the following statement is true ?

Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open

If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes

If a parallel circuit is opened in the main line, the current

The resistance of a few metres of wire conductor in closed electrical circuit is

A 3 ohm resistor having 2 A current will dissipate the power of

The filament of an electric bulb is made of

In a series circuit with unequal resistances

The rating of a fuse wire is always expressed in

Insulating materials have the function of

Varistors are

Which one of the following does not have negative temperature co-efficient ?

A resistance having rating 10 ohms, 10W is likely to be a

All of the following are equivalent to watt except

For which of the following 'ampere second' could be the unit ?

Which is the best conductor of electricity ?

Ohm's law is not applicable to

Which of the following materials has a negative temperature co-efficient of resistance?

Which of the following statement is true both for a series and a parallel D.C. circuit?

Two resistors are said to be connected in series when

You have to replace 1500 ohm resistor in radio. You have no 1500 ohm resistor but have several 1000 ohm ones which you would connect

Which of the following material has nearly zero temperature co-efficient of resistance?

Current velocity through a copper conductor is