Test: Analog Electronics - 4
25 Questions MCQ Test Analog Circuits | Test: Analog Electronics - 4
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If the Q of a single stage single tuned amplifier is doubled, the bandwidth will
. If Q is doubles, bandwidth becomes half.
In full wave rectification, if the input frequency is 50 Hz, then frequency at the output of filter is
Filter output will give d.c. signal and d.c. signal Passed zero frequency.
It is a L.P.F. of second order.
The turn ratio of a transformer is 20:1, if a load of 10Ω is connected across the secondary, what will be the effective resistance seen looking into the Primary?
In a CE amplifier circuit the ac voltage between emitter and ground
Common emitter means emitter at ground potential.
A 120 V, 30 Hz source feeds a half wave rectifier circuit through a 4 : 1 step down transformer, the average output voltage is
.
Slew rate signifies the fastest change which can occurs in output voltage. In an ideal op-amp the output can change instantaneously.
Regulation of the DC power supply of 12 V, 100 mA is the effective resistance of power supply is 20 Ω
.
A bridge diode circuit using ideal diodes has in input voltage of 20 sin ωt volts. The average and rms values of output voltage are
.
In the circuit of figure v1 = 8 V and v2 = 0. Which diode will conduct (Assume ideal diodes)?
Since only v1 is positive and more than 0.7 V only D1 will conduct.
Assertion (A): An op-amp has high voltage gain, high input impedance and low output impedance
Reason (R): Negative feedback increases output impedance
Negative feedback reduces output impedance.
A transistor has a maximum power dissipation of 350 mW at an ambient temperature of 25ºC. If derating factor is 2 mW/ºC, the maximum power dissipation for 40ºC ambient temperature is
Derating improves reliability but does not affect maximum power dissipation.
The output voltage waveform of a CE amplifier is fed to a dc coupled CRO. The trace on the screen will be
Due to direct coupling between output and CRO both dc and ac output voltage will appear on screen of CRO.
In an RC phase shift oscillator, the total phase shift of the three RC lead networks is
Each RC network gives 60º phase shift.
In the circuit of figure β = 100 and quiescent value of base current is 20 μA. The quiescent value of collector
current is
IC = βIB = 2 mA.
.
Assertion (A): In an op-amp the voltage gain and band width can be adjusted as per requirement
Reason (R): Large value capacitor can also be fabricated on a chip
Large value capacitor cannot be fabricated on a chip.
In figure which diode will conduct and what will be the value of V0?
Since battery connected to anode of D, is of 5 V it is forward biased. D1 and D3 are reverse biased. Output voltage is 5 V.
For the amplifier circuit of figure, the h parameters of transistor are hib = 25 Ω, hfb = 0.999, hob = 10-6 Ω. The voltage gain is
It is a common base circuit 
.
In figure, VCC = + 30 V, R1 = 200 kΩ and R2 = 100 kΩ. If VBE = 0.7 V, the voltage a cross RE =
.
Series voltage, series current, shunt voltage and shunt current.
In a class C power amplifier the input frequency of ac signal is 1 MHz. If tank circuit has C = 1000 pF, the value of L =
V0 = 
(Vs2 - Vs1)
[Vs1 - Vs1] = 0.
In calculating output impedance of an amplifier the source is replaced by an open circuit.
It is replaced by short circuit.
For transistor 2 N 338 the manufacturer specifies Pmax = 100 mW at 250ºC free air temperature and maximum junction temperature of 125ºC. Its thermal resistance is
.
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