ANALOG CIRCUITS
1. The breakdown voltage of a transistor with its base open is BVCEO and with emitter open is BVCBO, then
(a) BVCEO < BVCBO
(b) BVCEO = BVCBO
(c) BVCEO > BVCBO
(d) Both voltages are unrelated
2. The threshold voltage of an n-channel MOSFET can be increased by
(a) increasing the channel doping concentration
(b) reducing the channel length
(c) reducing gate oxide thickness
(d) decreasing channel doping concentration
3. As the temperature is increased, the voltage across a diode carrying a contant current
(a) increases
(b) decreases
(c) remains constant
(d) may increase or decrease depending upon the doping levels in the junction
4. A series RLC circuit when excited by a 10V sinusoidal voltage source of variable frequency, exbits resonance of 100Hz and has a 3 dB bandwidth of 5 Hz. The voltage across inductor L at resonance is
(a)10 V
(b)10√2 V
(c) 10/√2 V
(d) 200 V
5. A CE amplifier has resistor RF connected between collector and base RF = 40 k.
RC = 4k. Given hfe = 50, rπ= 1k, the output resistance R0d is given by
(a) 40 k
(b) 20 k
(c) 4 k
(d) 0.66 k
6. When two identical stages with upper cutoff at wn are cascaded, the over all B db
point is
(a) 1 ωH
(b) 2 ωH
(c) 0.5 ωH
(d) 0.64 ωH
7. The parameters of FET are gm = 95 mA / volt total capacitance = 500 pf. For a voltage
gain of -30, the bandwidth will be
(a) 333 Ω
(b) 3 kΩ
(c) 2.7 kΩ
(d) 300 Ω
8. FET tuned amplifier with gm = 5Ma/V. rd = 20 k has a resonance impedence of 20 kΩ.
The gain resonance is given by
(a) 200
(b) 100
(c) 50
(d) 25
9. A cascade ICis now available for tuned PF and IF amplifiers. The significant which
make it attractive is
(a) high value of input impedence
(b )high value of current gain
(c) low value of h12
(d) low value of output impedence
10. In a class A series fed amplifier using a transistor, under ideal conditions, the
maximum ac power delivered is 1 watt. The maximum transistor dissipation
capability has to be
(a) 1 watts
(b) 2 watts
(c) 3 watts
(d) 4 watts
11. An npn transistor has a beta cut-off frequency fb of 1MHz, and emitter short circuit
low frequency current gain β0 of 200. the unity gain frequency ft and the alpha cut off
frequency fα respectively are
(a) 200 MHz,201 MHz
(b) 200 MHz ,199 MHz
(c) 199 MHz,200 MHz
(d) 201 MHz,200MHz
1. The breakdown voltage of a transistor with its base open is BVCEO and with emitter open is BVCBO, then
(a) BVCEO < BVCBO
(b) BVCEO = BVCBO
(c) BVCEO > BVCBO
(d) Both voltages are unrelated
2. The threshold voltage of an n-channel MOSFET can be increased by
(a) increasing the channel doping concentration
(b) reducing the channel length
(c) reducing gate oxide thickness
(d) decreasing channel doping concentration
3. As the temperature is increased, the voltage across a diode carrying a contant current
(a) increases
(b) decreases
(c) remains constant
(d) may increase or decrease depending upon the doping levels in the junction
4. A series RLC circuit when excited by a 10V sinusoidal voltage source of variable frequency, exbits resonance of 100Hz and has a 3 dB bandwidth of 5 Hz. The voltage across inductor L at resonance is
(a)10 V
(b)10√2 V
(c) 10/√2 V
(d) 200 V
5. A CE amplifier has resistor RF connected between collector and base RF = 40 k.
RC = 4k. Given hfe = 50, rπ= 1k, the output resistance R0d is given by
(a) 40 k
(b) 20 k
(c) 4 k
(d) 0.66 k
6. When two identical stages with upper cutoff at wn are cascaded, the over all B db
point is
(a) 1 ωH
(b) 2 ωH
(c) 0.5 ωH
(d) 0.64 ωH
7. The parameters of FET are gm = 95 mA / volt total capacitance = 500 pf. For a voltage
gain of -30, the bandwidth will be
(a) 333 Ω
(b) 3 kΩ
(c) 2.7 kΩ
(d) 300 Ω
8. FET tuned amplifier with gm = 5Ma/V. rd = 20 k has a resonance impedence of 20 kΩ.
The gain resonance is given by
(a) 200
(b) 100
(c) 50
(d) 25
9. A cascade ICis now available for tuned PF and IF amplifiers. The significant which
make it attractive is
(a) high value of input impedence
(b )high value of current gain
(c) low value of h12
(d) low value of output impedence
10. In a class A series fed amplifier using a transistor, under ideal conditions, the
maximum ac power delivered is 1 watt. The maximum transistor dissipation
capability has to be
(a) 1 watts
(b) 2 watts
(c) 3 watts
(d) 4 watts
11. An npn transistor has a beta cut-off frequency fb of 1MHz, and emitter short circuit
low frequency current gain β0 of 200. the unity gain frequency ft and the alpha cut off
frequency fα respectively are
(a) 200 MHz,201 MHz
(b) 200 MHz ,199 MHz
(c) 199 MHz,200 MHz
(d) 201 MHz,200MHz
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