This set of Electronic Devices & Circuits Multiple Choice Questions & Answers (MCQs) focuses on “CLC Filter”.

1. Major part of the filtering is done by the first capacitor in a CLC filter because _________

a) The capacitor offers a very low reactance to the ripple frequency

b) The capacitor offers a very high reactance to the ripple frequency

c) The inductor offers a very low reactance to the ripple frequency

d) The inductor offers a very high reactance to the ripple frequency

2. At f=50Hz, the ripple factor of CLC filter is_________

a) ϒ=5700RL / (LC_{1}C_{2})

b) ϒ=5700/ (LC_{1}C_{2}R_{L})

c) ϒ=5700LC_{1}/ (C_{2}R_{L})

d) ϒ=5700C_{1}C_{2}/ (LR_{L})

3. What is the number of capacitors and inductors used in a CLC filter?

a) 1, 2 respectively

b) 2, 1 respectively

c) 1, 1 respectively

d) 2, 2 respectively

4. A single phase full wave rectifier makes use of pi section filter with 10µF capacitors and a choke of 10henry. The secondary voltage is 280V and the load current is 100mA. Determine the dc output voltage when f=50Hz.

a) 345V

b) 521V

c) 243V

d) 346V

5. The inductor is placed in the L section filter because_________

a) It offers zero resistance to DC component

b) It offers infinite resistance to DC component

c) It bypasses the DC component

d) It bypasses the AC component

6. The advantages of a pi-filter is_________

a) low output voltage

b) low PIV

c) low ripple factor

d) high voltage regulation

7. For a given CLC filter, the operating frequency is 50Hz and 10µF capacitors used. The load resistance is 3460Ω with an inductance of 10henry. Calculate the ripple factor.

a) 0.165%

b) 0.142%

c) 0.178%

d) 0.321%

8. The voltage in case of a full wave rectifier in a CLC filter is_________

a) V_{ϒ} = I_{DC}/2fC

b) V_{ϒ} = I_{DC} fC

c) V_{ϒ} = I_{DC}/fC

d) V_{ϒ} = 2I_{DC}fC

9. What is the relation between time constant and load resistance?

a) They don’t depend on each other

b) They are directly proportional

c) They are inversely proportional

d) Cannot be predicted

10. The output waveform of CLC filter is superimposed by a waveform referred to as_________

a) Square wave

b) Triangular wave

c) Saw tooth wave

d) Sine wave