Chapter 16 - Alternating Current - 5

Chapter 16 - Alternating Current - 5

1. A capacitor of 2000 uf is connected across alternating source of 20 volts. If frequency of the source is 50 cps then the reactance of a capacitor=

a) 1.59Ω
b) 50 Ω
c) 200Ω
d) 2.5Ω

2. In a pure inductor coil, the power dissipated is:

a) Zero
b) Nearly equal to half of input power
c) Infinite
d) None

3. Inductor coils can be used in AC circuits:

a) To control the rise of temperature
b) To absorb the electrical energy
c) To control the AC
d) All of the above

4. The combined effect of inductance XL and reactance XC is known as:

a) Resistance
b) Capacitance
c) Impedance
d) None

5. The impedance ‘Z’ can expressed by:

a) Z=V/I
b) Z=I+V
c) Z=I/V
d) Z=I-V

6. Ohms is the unit of:

a) Resistance
b) All of the above
c) Reactance
d) Impedance

7. Reactance Xc of a capacitor =

a) 2πfL
b) 1/2 fc
c) 1/2πfc

8. Inductive reactance SL of a inductor

a) 1/2πfL
b) 2πfL
c) 1/2πfc

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