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

• 1. 0.001 s
• 2. 0.1 s
• 3. 10 s
• 4. 100 s

Question: The safest value of current the human body can carry for more than 3 second is_________?

• 1. 4 mA
• 2. 9 mA
• 3. 15 mA
• 4. 25 mA

Question: Time constant of a circuit is the time in seconds taken after the application of voltage to each___________?

• 1. 25% of maximum value
• 2. 50% of maximum value
• 3. 63% of maximum value
• 4. 90% of the maximum value

Question: Power factor of electric bulb is__________?

• 1. zero
• 2. lagging
• 3. leading
• 4. unity

Question: Which of the following circuit component opposes the change in the circuit voltage ?

• 1. Inductance
• 2. Capacitance
• 3. Conductance
• 4. Resistance

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