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.Management Sciences
Category: A.C. Fundamentals, Circuits and Circuit Theory
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
In an A.C. circuit power is dissipated in____________?
A. resistance only
B. inductance only
C. capacitance only
D. none of the above
The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that
A. both waves must have same frequency
B. both waves must have identical peak values
C. both waves must have zero value at the same time
D. none of the above
The frequency of an alternating current is____________?
A. the speed with which the alternator runs
B. the number of cycles generated in one minute
C. the number of waves passing through a point in one second
D. the number of electrons passing through a point in one second
In any A.C. circuit always__________?
A. apparent power is more than actual power
B. reactive power is more than apparent power
C. actual power is more than reactive power
D. reactive power is more than actual power
The frequency of domestic power supply in Pakistan is_________?
A. 200 Hz
B. 100 Hz
C. 60 Hz
D. 50 Hz
For a sine wave with peak value Imax the r.m.s. value is_______?
A. 0.5 Imax
B. 0.707
C. 0.9
D. 1.414 Lmax
The r.m.s. value of pure cosine function is_________?
A. 0.5 of peak value
B. 0.707 of peak value
C. same as peak value
D. zero
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
In a pure resistive circuit__________?
A. current lags behind the voltage by 90°
B. current leads the voltage by 90°
C. current can lead or lag the voltage by 90°
D. current is in phase with the voltage
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