The time constant of a series R-C circuit is given by____________?
A. R/C
B. RC2
C. RC
D. R2C
Month: December 2018
Pure inductive circuit takes power from the A.C. line when_________?
Pure inductive circuit takes power from the A.C. line when_________?
A. applied voltage decreases but current increases
B. applied voltage increases but current decreases
C. both applied voltage and current increase
D. both applied voltage and current decrease
Which of the following circuit component opposes the change in the circuit voltage ?
Which of the following circuit component opposes the change in the circuit voltage ?
A. Inductance
B. Capacitance
C. Conductance
D. Resistance
Power factor of electric bulb is__________?
Power factor of electric bulb is__________?
A. zero
B. lagging
C. leading
D. unity
Time constant of a circuit is the time in seconds taken after the application of voltage to each___________?
Time constant of a circuit is the time in seconds taken after the application of voltage to each___________?
A. 25% of maximum value
B. 50% of maximum value
C. 63% of maximum value
D. 90% of the maximum value
The safest value of current the human body can carry for more than 3 second is_________?
The safest value of current the human body can carry for more than 3 second is_________?
A. 4 mA
B. 9 mA
C. 15 mA
D. 25 mA
If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be________?
If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be________?
A. 0.001 s
B. 0.1 s
C. 10 s
D. 100 s
In a R-L-C circuit_________?
In a R-L-C circuit_________?
A. power is consumed in resistance and is equal to I R
B. exchange of power takes place between inductor and supply line
C. exchange of power takes place between capacitor and supply line
D. exchange of power does not take place between resistance and the supply line
E. all above are correct
If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave_________ ?
If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave_________ ?
A. 42.42 sin 3141
B. 60 sin 25 t
C. 30 sin 50 t
D. 84.84 sin 25 t
Which of the following coil will have large resonant frequency __________?
Which of the following coil will have large resonant frequency __________?
A. A coil with large resistance
B. A coil with low resistance
C. A coil with large distributed capacitance
D. A coil with low distributed capacitance