Electronic Design - Electronic Devices & Appliances

D.C current of a half wave rectifier is _____.Here, Im = peak value of the input current.

An Emitter follower is used for _____.

A half wave rectifier supplies power to 1000Ω load from a 110V (r.m.s) source of supply. If the forward resistance of the diode is 20Ω. What would be the efficiency of the rectifier?

The dV/dt capability of the thyristor is _____ that of the triac.

The alpha of a transistor is _____.

In a class-B power amplifier, the output signal is obtained only _____.

The transformer is used for impedance matching . It is expected to match 1296Ω resistance on the primary side to a 16Ω resistance on the secondary side. Calculate the required turn ratio of a transformer, what is the type of transformer?

For insulators, the forbidden gap is of the order of _____.

After triggering an SCR , the gate pulse is removed. the current in the SCR will _____.

The loop gain of the oscillator to start with is _____.

The gain of an inverting operational amplifier is given as _____________.

In a complementary – symmetry amplifier, both transistors are used in the ____ configuration/s

A feedback amplifier has an internal gain = 40dB and a feedback factor = 0.05, if the input impedance of this circuit is 12KΩ. What would have been the input impedance of the amplifier if the feedback had not been present?

Both positive and negative feedbacks are employed in _____.

Ultraviolet radiation is used in the IC fabrication process for _____.

For a three phase full wave rectifier, no load D.C output is _____.

An R-C phase shift oscillator will not produce any oscillations until and unless the voltage gain of its internal amplifier is _____.

The latching current of an SCR is _____.

A bridge rectifier circuit has secondary voltage of 12Vr.m.s. Assume secondary resistance and diode forward resistance to be negligible. The load resistance is 100Ω. What would be the peak load current?

A crystal oscillator provides very stable frequency because of _____.

In a Wien-bridge oscillator with R=5KΩ and C=0.01µF, the frequency of oscillation will be _____.

A voltage V=300cos100t is applied to a half wave rectifier with RL =5KΩ. The rectifier may be represented by an ideal diode in series with a resistance of 1KΩ. What would be the ripple factor in this case?

The transistor equivalent of the thyratron tube is _____.

Refer to the given image:The circuit shown in the image has a zener regulated D.C power supply. Assuming that the zener diode is ideal, the minimum value of RL due to which the output voltage would remain constant will be ________.

What would be the input impedance of an ideal op-amp?

The application where one is most likely to find a quartz oscillator would be _____.

The most important characteristic of a crystal oscillator is _____.

Negative Feedback in amplifiers increases _____.

For class-AB power amplifier, the output current flows _____.

If the RF signal is 600 KHz and the local oscillator frequency is 1000KHz, the output of the mixer will be _____.

A differentiator converts a linear ramp into a _____.

Which one of the following amplifiers has the highest efficiency?

Suppose the anode current of a conducting SCR is 50A. If its gate current is reduced to one-fifth, its anode current will become _____.

Refer to the given image:The voltage at V1 and V2 of the arrangement shown in the image, will be _________ respectively.

For designing a Push-Pull amplifier, the type of transistors should be _____.

If a diode is connected in anti-parallel with a thyristor, _____.

The Hall Effect voltage in intrinsic silicon _____.

An amplifier has a bandwidth of 200KHz and a voltage gain of 100. What will be the new bandwidth if 5% negative feedback is introduced?

Which semiconductor power device out of the following is not a current triggered device?

In an amplifier , the coupling capacitors are employed for _____.

Which one of the following is a general purpose operational amplifier?

Which of the following does not cause permanent damage to an SCR?

An operational amplifier can amplify ____________.

An oscillator is a _____.

The voltage gain of an amplifier without feedback is 60dB. It decreases to 40dB with feedback. What will be the feedback factor?

Electro___________ is a procedure that destroys tissue by burning with an electric spark.

The output impedance of an operational amplifier is _____.

In a negative feedback circuit , the feedback factor is always between _____.

An emitter follower is found to have a voltage gain of 0.99. What would be the value of ß for its transistors?

An amplifier has a gain of 10 without feedback. To make it oscillate, ß must be _____.