A.C. Fundamentals, Circuits and Circuit Theory - Set 01 - ObjectiveBooks

# Practice Test: Question Set - 01

1. The power consumed in a circuit element will be least when the phase difference between the current and voltage is
(A) 180°
(B) 90°
(C) 60°
(D) 0°

2. Form Factor is the ratio of
(A) Average value/r.m.s. value
(B) Average value/peak value
(C) r.m.s. value/average value
(D) r.m.s. value/peak value

3. Capacitive reactance is more when
(A) Capacitance is less and frequency of supply is less
(B) Capacitance is less and frequency of supply is more
(C) Capacitance is more and frequency of supply is less
(D) Capacitance is more and frequency of supply is more

4. Pure inductive circuit
(A) Consumes some power on average
(B) Does not take power at all from a line
(C) Takes power from the line during some part of the cycle and then returns back to it during other part of the cycle
(D) None of the above

5. Power factor of the following circuit will be zero
(A) Resistance
(B) Inductance
(C) Capacitance
(D) Both (B) and (C)

6. The double energy transient occur in the
(A) Purely inductive circuit
(B) R-L circuit
(C) R-C circuit
(D) R-L-C circuit

7. 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

8. Magnitude of current at resonance in R-L-C circuit
(A) Depends upon the magnitude of R
(B) Depends upon the magnitude of L
(C) Depends upon the magnitude of C
(D) Depends upon the magnitude of R, Land C

9. 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

10. The purpose of a parallel circuit resonance is to magnify
(A) Current
(B) Voltage
(C) Power
(D) Frequency

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