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.
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12.

An electric current of 5 A is same as

  • 5 J / C
  • 5 V / C
  • 5 C / sec
  • 5 w / sec.
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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.
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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.
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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.
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16.

Conductance is expressed in terms of

  • ohm / m
  • m / ohm
  • mho / m
  • mho.
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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
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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.
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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.
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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.
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