If the Q of a single stage single tuned amplifier is doubled, the bandwidth will
In full wave rectification, if the input frequency is 50 Hz, then frequency at the output of filter is
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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
A 120 V, 30 Hz source feeds a half wave rectifier circuit through a 4 : 1 step down transformer, the average output voltage is
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)?
Assertion (A): An op-amp has high voltage gain, high input impedance and low output impedance
Reason (R): Negative feedback increases 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
The output voltage waveform of a CE amplifier is fed to a dc coupled CRO. The trace on the screen will be
In an RC phase shift oscillator, the total phase shift of the three RC lead networks is
In the circuit of figure β = 100 and quiescent value of base current is 20 μA. The quiescent value of collector
current is
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
In figure which diode will conduct and what will be the value of V0?
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
In figure, VCC = + 30 V, R1 = 200 kΩ and R2 = 100 kΩ. If VBE = 0.7 V, the voltage a cross RE =
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 =
In calculating output impedance of an amplifier the source is replaced by an open 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