The value of the steady current which when flowing through the same resistor produces heat at the same rate as the mean rate of heat produced by the alternating current is__________________?

Related Mcqs:

1. An alternating current is represented by the equation I = I∫sinπt which of the following equation represents an alternating current of frequency and amplitude twice that of the above current ?

   A. I = 2I∫Sin(πt/2)
   B. I = 2I∫Sin(2πt)
   C. I = 2ISinπt
   D. I = I∫sin(2πt)

2. An alternating current of the r.m.s value of 4.0 A and frequency 50Hz flows in a circuit containing a 10Ω resistor. The peak current is then ?

   A. 20A
   B. 20.66A
   C. 6.66A
   D. 5.66A

3. An emf of 5 volt is produced by a self inductance, when the current changes at a steady rate from 3 to 2 ampere in 1 millisecond. The value of self inductance is_______?

   A. zero
   B. 5 H
   C. 5000 H
   D. 5 mH

   Submitted by: Tauseef Ali

4. A voltage V = V0 cos ωt is applied across a resistor of resistance R the average power dissipated per cycle in the resistor is given by___________?

   A. V√/√2R
   B. V/√2√R
   C. V02/√2R
   D. 2/√2√R

5. To find the r.m.s value of an alternating current mathematically we need to have ________________?

   A. Mean value of I2
   B. Square root of mean value of I2
   C. Square root of I2
   D. Square of 1/2

6. Production of heat due to an electric current flowing through a conductor is given by _________________?

   A. Joule effect
   B. Joule Thomsons effect
   C. Comptons effect
   D. Feed back effect

7. An alternating current or voltage_____________________?

   A. fluctuates off and on
   B. varies in magnitude alone
   C. changes its direction again and again
   D. changes its magnitude harmonically and reverses its direction of flow after regularly recurring intervals

8. pure resistor circuit the voltage and current are_______________?

   A. Lagging each other
   B. They are at 90? phase difference
   C. They have zero phase difference
   D. No phase difference

9. The alternating voltage is an example of_______________?

   A. A digital waveform
   B. An analogue waveform
   C. Discrete waveform
   D. None at all

10. An ammeter measures the total current flowing through a circuit when it is connected__________________?

    A. in series with the circuit
    B. in parallel with circuit
    C. in series with any of the parallel resistances in the circuit
    D. in parallel with any of the series resistances in the circuit