Question: Pure inductive circuit takes power from the A.C. line when_________?

• 1. applied voltage decreases but current increases
• 2. applied voltage increases but current decreases
• 3. both applied voltage and current increase
• 4. both applied voltage and current decrease

Question: The time constant of a series R-C circuit is given by____________?

• 1. R/C
• 2. RC2
• 3. RC
• 4. R2C

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

• 1. R only
• 2. L only
• 3. C only
• 4. LorC

Question: Magnitude of current at resonance in R-L-C circuit________?

• 1. depends upon the magnitude of R
• 2. depends upon the magnitude of L
• 3. depends upon the magnitude of C
• 4. depends upon the magnitude of R, Land C

Question: Time constant of an inductive circuit_________?

• 1. increases with increase of inductance and decrease of resistance
• 2. increases with the increase of inductance and the increase of resistance
• 3. increases with the decrease of inductance and decrease of resistance
• 4. increases with decrease of inductance and increase of resistance

Question: In a purely inductive circuit__________?

• 1. actual power is zero
• 2. reactive power is zero
• 3. apparent power is zero
• 4. none of above is zero

Question: Inductance of coil___________?

• 1. is unaffected by the supply frequency
• 2. decreases with the increase in supply frequency
• 3. increases with the increase in supply frequency
• 4. becomes zero with the increase in supply frequency

Question: Time constant of a capacitive circuit__________?

• 1. increases with the decrease of capacitance and decrease of resistance
• 2. increases with the decrease of capacitance and increase of resistance
• 3. increases with the increase of capacitance and decrease of resistance
• 4. increase with increase of capacitance and increase of resistance

Question: In any A.C. circuit always__________?

• 1. apparent power is more than actual power
• 2. reactive power is more than apparent power
• 3. actual power is more than reactive power
• 4. reactive power is more than actual power

Question: In a series L-C circuit at the resonant frequency the__________?

• 1. current is maximum
• 2. current is minimum
• 3. impedance is maximum
• 4. voltage across C is minimum