A. I = 2I∫Sin(πt/2)
B. I = 2I∫Sin(2πt)
C. I = 2ISinπt
D. I = I∫sin(2πt)
Related Mcqs:
- 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 - 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__________________?
A. Average current
B. Sinusoidal current
C. r.m.s current
D. Net current - 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 - 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 - A simple pendulum has a bob of mass m and its frequency is f. If we replaced the bob with a heavier one say of 2m then that will be its new frequency ?
A. 1/4f
B. 1/2f
C. frequency lower than 20 Hz
D. 2f - Fundamental frequency of stationary waves in open pipe is ______________ times the frequency in closed pipe?
A. One
B. Two
C. Four time
D. None of these - The alternating voltage is an example of_______________?
A. A digital waveform
B. An analogue waveform
C. Discrete waveform
D. None at all - In vibrating cord the points where the amplitude is maximum, are called ___________________?
A. antinodes
B. nodes
C. troughs
D. crests - When the amplitude of a wave becomes double its energy become_________________?
A. Double
B. Four times
C. One half
D. None time - The distance covered by a body in one complete vibration is 20cm. What is the amplitude of body ___________________?
A. 10 cm
B. 5 cm
C. 15 cm
D. 7.5 cm
