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1. Copper loss can be minimised by using

(a) shell type of core
(b) thick wires with low resistance
(c) cores made of stelloy
(d) cores made of mumetal

2. Power loss can be minimised by transmitting power at

(a) low voltage
(b) high power
(c) high current
(d) high voltage

3. The coefficient of mutual induction of two coils is numerically equal to _____ linked with one coil when unit current flows through the neighbouring coil.

(a) area
(b) self inductance
(c) power
(d) magnetic flux

4. The mutual induction is very large, if the two coils are wound on

(a) copper frame
(b) soft iron core
(c) bakelite
(d) wood

5. Cores of chokes used in low frequency A.C. circuit are made of

(a) aluminium
(b) iron
(c) mumetal
(d) stelloy

6. At resonant frequency of RLC series circuit impedance of the circuit

(a) and current becomes minimum
(b) and current becomes maximum
(c) is minimum and current becomes maximum
(d) is maximum and current becomes minimum

7. For long distance power transmission, power lines are made of conducting material like

(a) aluminium
(b) steel
(c) iron
(d) copper

8. Chokes used in wireless receiver circuits are called

(a) audio frequency chokes
(b) radio frequency chokes
(c) high frequency chokes
(d) both b and c

9. The average power of an ac circuit is also called ____ of the circuit.

(a) resonant power
(b) rms power
(c) instantaneous power
(d) true power

10. At resonance, the applied voltage is the potential drop across

(a) resistor
(b) inductor
(c) capacitor
(d) both a and b

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