Basic electrical MCQ #13

1) In a circuit, a 29-ohm resistor carries a current of 3 A. Find the voltage across the resistor.

      a) 23 V

      b) 87 V

      c) 3 V

      d) 54 V

2) A current of 16 A divide in two paths of 8 ohms and 12 ohms respectively. Find the current in individual path.

      a) 6.4 A, 9.6 A

      b) 4.6 A, 6.9 A

      c) 8 A, 8 A

      d) 12 A, 1 A

3) The rating of fuse wire is always in

      a) kWh

      b) Ampere

      c) Volt

      d) Watt

4) The hot resistance of the bulb’s filament is higher compared to its cold resistance. In this case, the temperature co-efficient of the filament is  

      a) negative

      b) 1

      c) zero

      d) positive

ANSWER: | 1-b | 2-a | 3-b | 4-d |

5) The insulation thickness depends on

      a) the magnitude of voltage on the conductor

      b) the magnitude of current following through it

      c) both a) and b)

      d) none of the above

6) An electric filament bulb can work on which power source?

      a) DC source

      b) AC source

      c) Battery

      d) all of above

7) Find the resistance of 220 V, 100 W lamp.

      a) 484 ohms

      b) 4.84 ohms

      c) 48.4 ohms

      d) 4840 ohms

8) Which method is used for absolute measurement of resistance?

      a) Ohm’s law

      b) Raleigh method

      c) Wheatstone bridge

      d) Lorentz method

ANSWER: | 5-a | 6-d | 7-a | 8-c |

9) The ratio of mass of proton to that of electron is nearby

      a) 1840

      b) 184

      c) 18.4

      d) 1.8

10) Three resistors are connected in parallel. Each resistor dissipates 20 W power. Find how much power is supplied by the voltage source.

      a) 20 W

      b) 60 W

      c) 6.33 W

      d) 40 W

11) It becomes more difficult to remove

      a) first electrons from the orbit

      b) second electrons from the orbit

      c) third electrons from the orbit

      d) cannot predict the answer

12) International ohm is defined as the resistance of

      a) a cube of carbon

      b) a cube of iron

      c) the unit length of copper wire

      d) a column of mercury

ANSWER: | 9-a | 10-b | 11-c | 12-d |