Electronic Circuits

41. Class C amplifiers are used as

1. AF amplifiers
2. Small signal amplifiers
3. RF amplifiers
4. IF amplifiers

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42. Class C is an amplifier whose output current flows for

1. Less than one-half the entire input cycle
2. The entire input cycle
3. Twice the entire input cycle
4. Greater than one-half the entire input cycle

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43. Class C operation can have _________ percent efficiency.

1. 100%
2. 78.5%
3. 50%
4. 70%

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44. Class C operation is preferred in oscillators because it

1. Is more efficient
2. Gives larger outputs
3. Produces square waves
4. Increases stability

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45. Comparatively, power amplifier has _________ β.

1. Large
2. Very large
3. Small
4. Very small

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46. Consider a zener diode with a slope resistance of 10 Q in series with a 90 Q resistor fed from a dc supply containing a ripple voltage of 20mV peak-to-peak. Compute for the ripple voltage in load

1. 1 mV p-p
2. 2 mV p-p
3. 1 V p-p
4. 6mV p-p

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47. Determine the attenuation in dB for a T-pad for which R1=R2=40Ω and R3= 36 Ω. The pad connects a 50 Ω generator to a 50 Ω load.

1. 9.83 dB
2. 83.93 dB
3. 10.83 dB
4. 11.93 dB

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48. Emitter follower employs _________ negative feedback.

1. 50%
2. 25%
3. 75%
4. 100%

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49. Emitter follower is used for

1. Impedance matching
2. Voltage gain
3. Current gain
4. Power gain

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50. Feedback circuit usually employs _________ network

1. Resistive
2. Inductive
3. Capacitive
4. Active

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