AC Fundamentals, Circuits & Circuit Theory Mcqs - Set 6

1)   Which of the following circuit component opposes the change in the circuit voltage ?

a. Inductance
b. Capacitance
c. Conductance
d. Resistance
Answer  Explanation 

ANSWER: Capacitance

Explanation:
No explanation is available for this question!


2)   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
Answer  Explanation 

ANSWER: applied voltage decreases but current increases

Explanation:
No explanation is available for this question!


3)   The time constant of a series R-C circuit is given by____________?

a. R/C
b. RC2
c. RC
d. R2C
Answer  Explanation 

ANSWER: RC

Explanation:
No explanation is available for this question!


4)   In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of__________?

a. R only
b. L only
c. C only
d. LorC
e. R,LorC
Answer  Explanation 

ANSWER: LorC

Explanation:
No explanation is available for this question!


5)   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
Answer  Explanation 

ANSWER: depends upon the magnitude of R

Explanation:
No explanation is available for this question!


6)   Time constant of an inductive circuit_________?

a. increases with increase of inductance and decrease of resistance
b. increases with the increase of inductance and the increase of resistance
c. increases with the decrease of inductance and decrease of resistance
d. increases with decrease of inductance and increase of resistance
Answer  Explanation 

ANSWER: increases with increase of inductance and decrease of resistance

Explanation:
No explanation is available for this question!


7)   In a purely inductive circuit__________?

a. actual power is zero
b. reactive power is zero
c. apparent power is zero
d. none of above is zero
Answer  Explanation 

ANSWER: actual power is zero

Explanation:
No explanation is available for this question!


8)   Inductance of coil___________?

a. is unaffected by the supply frequency
b. decreases with the increase in supply frequency
c. increases with the increase in supply frequency
d. becomes zero with the increase in supply frequency
Answer  Explanation 

ANSWER: increases with the increase in supply frequency

Explanation:
No explanation is available for this question!


9)   Time constant of a capacitive circuit__________?

a. increases with the decrease of capacitance and decrease of resistance
b. increases with the decrease of capacitance and increase of resistance
c. increases with the increase of capacitance and decrease of resistance
d. increase with increase of capacitance and increase of resistance
Answer  Explanation 

ANSWER: increase with increase of capacitance and increase of resistance

Explanation:
No explanation is available for this question!


10)   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
Answer  Explanation 

ANSWER: apparent power is more than actual power

Explanation:
No explanation is available for this question!


11)   In a series L-C circuit at the resonant frequency the__________?

a. current is maximum
b. current is minimum
c. impedance is maximum
d. voltage across C is minimum
Answer  Explanation 

ANSWER: current is maximum

Explanation:
No explanation is available for this question!