** 1. At what frequency the parallel RL circuit behaves as purely resistive circuit?**

**(a)**low.

**(b)** high.

**(c)** very low.

**(d)** very high.

**Answer**

** 2. If the supply frequency of an purely inductive circuit is reduced by half, then the circuit current is**

**(a)**zero.

**(b)** remain same.

**(c)** doubled.

**(d)** reduced by half.

**Answer**

** 3. If the supply frequency of an purely capacitive circuit is reduced by half, then the circuit current is**

**(a)**zero.

**(b)** doubled.

**(c)** remain same.

**(d)** reduced by half.

**Answer**

** 4. Power factor is a factor which must be multiplied to apparent power to obtain**

**(a)**reactive power.

**(b)** true power.

**(c)** wavelength.

**(d)** phase angle.

**Answer**

** 5. When a capacitor and a resistor are connected in series, the current will**

**(a)**lag the voltage.

**(b)** leads the voltage.

**(c)** in phase with voltage.

**(d)** leads voltage by 90°.

**Answer**

** 6. For the r.m.s. value of 20 V, the peak to peak value is**

**(a)**14.14.

**(b)** 22.22.

**(c)** 28.28.

**(d)** 56.56.

**Answer**

** 7. If the energy stored in the magnetic field of an coil is 10 times the energy wasted in its resistance, the quality factor of that coil is**

**(a)**5.

**(b)** 2.5.

**(c)** 10.

**(d)** 20.

**Answer**

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