Two waves of the same frequency have opposite phase when the phase angle between them is_________?
A. 360°
B. 180°
C. 90°
D. 0°
Circuits and Circuit Theory
If two sine waves of the same frequency have a phase difference of JT radians, then_______?
If two sine waves of the same frequency have a phase difference of JT radians, then_______?
A. both will reach their minimum values at the same instant
B. both will reach their maximum values at the same instant
C. when one wave reaches its maxi¬mum value, the other will reach its minimum value
D. none of the above
A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to__________?
A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to__________?
A. average voltage
B. r.m.s. voltage
C. peak voltage
D. none of the above
The voltage of domestic supply is 220V. This figure represents__________?
The voltage of domestic supply is 220V. This figure represents__________?
A. mean value
B. r.m.s. value
C. peak value
D. average value
If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is____________?
If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is____________?
A. a sinusoid of the same frequency
B. a sinusoid of half the original frequency
C. a sinusoid of double the frequency
D. not a sinusoid
The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 Q. If frequency is increased to 100 Hz, reactance becomes_______ohms?
The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 Q. If frequency is increased to 100 Hz, reactance becomes_______ohms?
A. 2.5
B. 5
C. 10
D. 15
The period of a wave is___________?
The period of a wave is___________?
A. the same as frequency
B. time required to complete one cycle
C. expressed in amperes
D. none of the above
The form factor is the ratio of_______?
The form factor is the ratio of_______?
A. peak value to r.m.s. value
B. r.m.s. value to average value
C. average value to r.m.s. value
D. none of the above
A sine wave has a frequency of 50 Hz. Its angular frequency is ________ radian/second.
A sine wave has a frequency of 50 Hz. Its angular frequency is ________ radian/second.
A. 100 n
B. 50 jt
C. 25 JT
D. 5 n
The double energy transient occur in the____________?
The double energy transient occur in the____________?
A. purely inductive circuit
B. R-L circuit
C. R-C circuit
D. R-L-C circuit