Electrical Engineering- Electric Current and Ohm's Law
Electrical Engineering- Electric Current and Ohm's Law
11.
One kilowatt hour of electrical energy is the same as
- 36 x 105 watts
- 36 x 10s ergs
- 36 x 105 joules
- 36 x 105 B.T.U.
13. An electron of mass m kg and having a charge of e coulombs travels from rest through a potential difference of V volts. Its kinetic energy will be
- eV Joules
- meV Joules
- me / V Joules
- V / me Joules.
14.
The value of the following is given by 100 (kilo ampere ) x ( micro ampere ) 100 milli ampere * 10 ampere
- 0.001 A
- 0.1 A
- 1 A
- 10A.
15. circuit contains two un-equal resistances in parallel
- current is same in both
- large current flows in larger resistor
- potential difference across each is same
- smaller resistance has smaller conductance.
17.
Which of the following could be the value of resistivity of copper?
- 1.7 x 10-8 ohm-cm
- 1.7 x 10-6 ohm-cm
- 1.6 x 10-5 ohm-cm
- 1.7 x 10-4 ohm-cm
18.
A copper wire of length l and diameter d has potential difference V applied at its two ends. The drift velocity is vd. If the diameter of wire is made d/3, then drift velocity becomes
- 9 vd
- vd / 9
- vd /3
- vd.
19.
Two resistances R1 and R2 give combined resistance of 4.5 ohms when in series and 1 ohm when in parallel. The resistances are
- 3 ohms and 6 ohms
- 3 ohms and 9 ohms
- 1.5 ohms and 3 ohms
- 1.5 ohms and 0.5 ohms.
20.
We have three resistances of values 2 Ω, 3 Ω and 6 Ω. Which of the following combination will give an effective resistance of 4 Ω?
- All the three resistances in parallel
- 2 Ω resistance in series with parallel combination of 3 Ω and 6 Ω resistance
- 3 Ω resistance in series with parallel combination of 2 Ω and 6 Ω resistance
- 6 Ω resistance in series with parallel combination of 2 Ω and 3 Ω resistance.