a c fundamentals circuits and circuit theory Mcqs
101. The power factor of a D.C. circuit is always__________?
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A. less than unity

B. zero

C. greater than unity

D. unity
102. The r.m.s. value of pure cosine function is_________?
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A. 0.707 of peak value

B. zero

C. same as peak value

D. 0.5 of peak value

103. At very low frequencies a series R-C circuit behaves as almost purely___________?
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A. capacitive

B. inductive

C. resistive

D. none of the above

104. The series and parallel resonance on L-C circuit differs in that_________?
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A. series resonance needs a high-resistance source for sharp increase in current

B. parallel resonance needs a low-resistance source for a sharp increase in impedance

C. parallel resonance needs a low-resistance source for a sharp rise in line current

D. series resistance needs a low-resistance source for sharp rise in current
105. In a sine wave the slope is constant_______?
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A. between 180 and 270

B. between 90 and 180

C. between 0 and 90

D. no where
106. The purpose of a parallel circuit resonance is to magnify________?
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A. frequency

B. power

C. voltage

D. current

107. The safest value of current the human body can carry for more than 3 second is_________?
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A. 9 mA

B. 15 mA

C. 4 mA

D. 25 mA

108. In any A.C. circuit always__________?
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A. actual power is more than reactive power

B. reactive power is more than actual power

C. reactive power is more than apparent power

D. apparent power is more than actual power
109. What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value________ ?
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A. 45

B. 90

C. 0

D. 180

110. The frequency of domestic power supply in Pakistan is_________?
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A. 200 Hz

B. 50 Hz

C. 60 Hz

D. 100 Hz

111. If resistance is 20 Q. and inductance is 27 in a R-L series circuit, then time constant of this circuit will be________?
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A. 10 s

B. 100 s

C. 0.001 s

D. 0.1 s