Nichrome wire is an alloy of_____________?

Related Mcqs:

1. A nichrome wire used as a heater coil has the resistance of 2 £2/m. For a heater of 1 kW at 200 V, the length of wire required will be_____________?

   A. 80 m
   B. 60 m
   C. 40 m
   D. 20 m

2. Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes__________?

   A. 1/9 times
   B. 3 times
   C. 9 times
   D. unchanged

3. The resistance of a copper wire 200 m long is 21 Q. If its thickness (diameter) is 0.44 mm, its specific resistance is around_______________?

   A. 1.2 x 10~8 Q-m
   B. 1.4 x 10~8 Q-m
   C. 1.6 x 10″”8 Q-m
   D. 1.8 x 10″8 Q-m

4. The rating of a fuse wire is always expressed in________________?

   A. ampere-hours
   B. ampere-volts
   C. kWh
   D. amperes

5. The resistance of a few meters of wire conductor in closed electrical circuit is____________?

   A. practically zero
   B. low
   C. high
   D. very high

6. If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes______________?

   A. 0.4 ohm
   B. 0.6 ohm
   C. 0.8 ohm
   D. 1.0 ohm

7. A closed switch has a resistance of_____________?

   A. zero
   B. about 50 ohms
   C. about 500 ohms
   D. infinity

8. Which of the following are the passive elements?

   A. Resistor
   B. Bulb
   C. Both
   D. None of these.

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

   A. Aluminium
   B. Paper
   C. Rubber
   D. Mica

10. The hot resistance of the bulb’s filament is higher than its cold resistance because the temperature co-efficient of the filament is___________________?

    A. zero
    B. negative
    C. positive
    D. about 2 ohms per degree