Analog and power electronics

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A signal may have frequency components which lie in the range of 0.001 Hz to 10 Hz which of the following types of coupling should be chosen multistage amplifier designed to amplify this signal?

• RC coupling

• Transformer coupling

• Direct coupling

• Double-tuned coupling

If an input signal with non zero dc component is applied to a low pass RC network, then dc component in the output will be

• Same as that in the input

• Less than that in the input

• More than that in the input

• Zero

If an npn transistor with C 0.3pF has a unity gain cut off frequency fT of 409 MHz at a dc bias current Ic 1 mA the value of its C is approximately VT 26 mV

• 15

• 30

• 50

• 96

In the transistor circuit shown below the collector to ground voltage is +20V

The possible condition is

• Collector emitter terminals shorted

• Emitter to ground connection open

• 10 kilo ohms resistor open

• Collector base terminals shorted

The circuit shown in the figure is

• An oscillating circuit and its output is a square wave

• One whose output remains stable in ‘1’ state

• One whose output remains stable in ‘0’ state

• Having a single pulse of 3 times propagation delay

If differential amplifier has a differential gain of 20000. CMRR 80dB then common mode gain is

• 2

• 1/2

• 1

• 0

In a 3 phase half wave diode rectifier if Vm is the maximum value of per phase voltage then each diode is subjected to a peek inverse voltage of

• Vm

• Root(3) Vm

• 2Vm

• 3Vm

Resonant converters are basically used to

• Generate large peaky voltage

• Reduce switching losses

• Eliminate harmonics

• Convert a square wave to sine wave

In a 3 phase VSI operating in square wave mode the output line voltage is free from

• 3rd harmonic

• 7th harmonic

• 11th harmonic

• 13th harmonic