Test: Analog Electronics - 4 - Electrical Engineering (EE) MCQ

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

The slew rate of an ideal op-amp 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

Values of V_T at 20ºC for an ideal P-N diode

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 h_ib = 25 Ω, h_fb = 0.999, h_ob = 10^-6 Ω. The voltage gain is

In figure, V_CC = + 30 V, R₁ = 200 kΩ and R₂ = 100 kΩ. If V_BE = 0.7 V, the voltage a cross R_E =

A negative feedback can be of

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 =

The V_o of the op-amp circuit shown in the given is

In calculating output impedance of an amplifier the source is replaced by an open circuit.

For transistor 2 N 338 the manufacturer specifies P_max = 100 mW at 250ºC free air temperature and maximum junction temperature of 125ºC. Its thermal resistance is