Analog Electronics MCQ Questions & Answers

71

The r.m.s. value of half wave rectified current is 50A. Its r.m.s. value for full wave rectification would be

A) 100A B) $$\frac{{50}}{\pi }{\text{A}}$$ C) $$\frac{{100}}{\pi }{\text{A}}$$ D) 70.7A

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Answer & Solution

Answer: Option D

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72

How many stages are involved in bipolar op-amp?

A) 2 B) 3 C) 4 D) 6

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Answer: Option B

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73

Consider the above circuit, for V_i = V_m sinωt, the output voltage V₀ for R_L → ∞ will be:
Analog Electronics mcq question image

A) Zero B) V_m C) 2V_m D) -V_m

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Answer: Option C

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74

In the base biased transistor circuit, the junction temperature may vary from 25°C to 75°C. If β increase from 100 to 150 with raising temperature, percentage change in V_CE point will be
Analog Electronics mcq question image

A) 40% B) -44.57% C) -46.57% D) -48%

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Answer: Option B

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75

The range of frequency generated by VHF oscillator is-

A) 300 MHz - 3 GHz B) Above 3 GHz C) 30 MHz - 300 MHz D) 20 kHz - 30 MHz

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Answer: Option C

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76

An npn BJT has g_m = 38 mA/V, C_µ = 10^-14 F, C_π = 4 × 10^-13 F, and DC current gain β₀ = 90. For this transistor f_T and f_β are

A) f_T = 1.64 × 10⁸ Hz and f_β = 1.47 × 10¹⁰ Hz B) f_T = 1.47 × 10¹⁰ Hz and f_β = 1.64 × 10⁸ Hz C) f_T = 1.33 × 10¹² Hz and f_β = 1.47 × 10¹⁰ Hz D) f_T = 1.47 × 10¹⁰ Hz and f_β = 1.33 × 10¹² Hz

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Answer & Solution

Answer: Option B

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77

In the figure, assume that the forward voltage drops of the PN diode D₁ and Schottky diode D₂ are 0.7 V and 0.3 V, respectively. If ON denotes conducting state of the diode and OFF denotes non-conducting state of the diode, then in the circuit,
Analog Electronics mcq question image

A) Both D₁ and D₂ are ON B) D₁ is ON and D₂ is OFF C) Both D₁ and D₂ are OFF D) D₁ is OFF and D₂ is ON

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Answer: Option D

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78

The large signal bandwidth of an op-amp is limited by

A) Its slew rate specification B) Its Gain-bandwidth product C) CMRR D) None of these

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Answer & Solution

Answer: Option A

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79

In a transistor circuit I_B remains constant but β increases

A) Operating point will go down B) Operating point will go up C) Operating point will not change it position D) Operating point will shift as per value of base current I_B

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Answer: Option B

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80

Biasing is used in transistor amplifiers to
1. Stabilize the operating point against temperature variations.
2. Place the operating point in the linear region of the characteristics.
3. Make α, β and I_CO of the transistor independent of temperature variations.
4. Reduce distortion and increases dynamic range.

A) 1, 2, 3 and 4 B) 1, 2 and 4 only C) 1, 2 and 3 only D) 2, 3 and 4 only

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Answer: Option B

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Analog Electronics MCQ Questions & Answers | ECE