Electronic Circuits

51. Feedback factor is always

1. Less than 1
2. Equal to 1
3. More than 1
4. Zero

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52. Find the voltage drop developed across a D' Arsonval meter movement having an internal resistance of 1 kQ and a full deflection current of 150uA.

1. 150μV
2. 150mV
3. 150V
4. 200mV

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53. For a constant output frequency, the simplest sinusoidal oscillator is the _________ .

1. Crystal oscillator
2. Phase-shift circuit
3. Colpitts circuits
4. Hartley circuit

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54. For constant- K high-pass filter cut-off frequency (in Hz) is given by

1. 1 /(4η√Lc)
2. 1/(η√Lc)
3. 1/(2η√Lc)
4. η/√Lc

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55. For highest power gain, what configuration is used?

1. CC
2. CB
3. CE
4. CS

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56. Generally tuned amplifiers are operated in

1. Class C
2. Class A
3. Class B
4. Class AB

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57. Given three amplifiers with a gain of 10 and are connected in cascade. How much is the overall gain?

1. 24
2. 10000
3. 30
4. 20

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58. Hartley oscillator is commonly used in which of the following?

1. Radio receivers
2. TV receivers
3. Radio transmitters
4. CATV

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59. If a transistor is operated in such a way that output current flows for 160 degrees of the input signal, then it is _________ operation.

1. Class A
2. Class C
3. Class B
4. Class AB

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60. If an amplifier has a power gain of 100, then its dB gain is

1. 10
2. 40
3. 20
4. 100

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