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Page 14

The main reason why A.C. is transmitted at very high voltage and low current is that it

a.

flows faster thorough the conductor

b.

can be stepped down

c.

is cheaper to generate

d.

reduces heat loss

In the series R-L-C circuit at resonance, the voltages across the resistor and the inductor are 30 V and 40 V respectively. what is the voltage of across the capacitor?

a.

30 V

b.

70 V

c.

50 V

d.

40 V

Which of the following factors does not increase the rate of evaporation of water in a lake?

a.

Increase in the pressure of the atmosphere

b.

Rise in temperature

c.

Increase in the surface

d.

Increase in the speed of wind

The opposition offered to an alternating current in a C-R series circuit is known as

a.

impedance

b.

resistance

c.

reactance

d.

friction

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