ELECTRONIC DEVICES AND CIRCUITS - EDC
MID-I PRACTICE QUESTIONS
MULTIPLE CHOICE QUESTION AND ANSWERS
======================================================================1. Which rectifier requires four diodes ___________.
Answer is C)
Explanation: A bridge rectifier is a type of rectifier that uses four diodes.2. Efficiency of Half Wave Rectifier is ___________.
Answer is C)
Explanation: A half-wave rectifier's efficiency is 40.6%. This is lower than the efficiency of a full-wave rectifier, which is twice as much.3. Efficiency of Full Wave Rectifier is_____________________.
Answer is A)
The efficiency of a full-wave rectifier is 81.2%. This is the ratio of the DC output power to the AC input power.
4. The breakdown mechanism in a lightly doped p-n junction under reverse biased condition is called.
Answer is B)
Explanation: The breakdown mechanism in a lightly doped p-n junction under reverse biased condition is called Zener breakdown.5.In a PN diode, for constant value of current at room temperature, dv/dt varies approximately at the rate of.
Answer is D)
Explanation: if the temperature is increased at fixed voltage, the current I increases. To bring the current I to the original value, the voltage V has to be reduced. It is found that at room temperature for either germanium or silicon, dv/dt = -2.5 mv/deg c.6. ________ is a circuit which converts AC voltages and currents into pulsating DC voltages and currents.
Answer is A)
Explanation: A rectifier is an electrical device that converts alternating current (AC) into direct current (DC). The process of converting AC to DC is called rectification.7. Ripple of a capacitive filter ____________ as load resistance increases.
Answer is C)
Explanation: In a capacitive filter, the ripple voltage decreases as the load resistance increases. This is because the load resistance affects the filter capacitor's discharge time constant, which in turn affects the ripple voltage.8 Relation between % efficiency and Transformer Utilization factor is given by _________
Answer is C)
Explanation: The relation between percent efficiency and transformer utilization factor (TUF) is given by the expected current draw from the supply and how much ripple voltage is acceptable in the supply.9. Peak inverse voltage of centre tapped full wave rectifier is _____________.
Answer is B)
Explanation: The peak inverse voltage (PIV) of a center tapped full wave rectifier is 2Vmax, which is twice the transformer secondary terminal voltage.10.A C-L-C filter is also known as __________ filter
Answer is B)
Explanation: A C-L-C filter is also known as a pi filter or capacitor input filter. The C-L-C filter is an electronic filter circuit that consists of a series connection of a capacitor, an inductor, and another capacitor arranged in the shape of the Greek letter “Pi” (π).11. The processes of adding impurities to semiconductor is called____________
Answer is B)
The process of adding impurities to a semiconductor is called doping. The impurities are called dopants. Doping increases the electrical conductivity of a semiconductor.12. PN junction failure above 8 V is caused predominantly due to _________
Answer is A)
A p-n junction that experiences breakdown above 5 volts is caused by the avalanche effect. The avalanche effect occurs when the reverse bias voltage applied to the diode is increased to a high enough value, causing the diode's PN junction to overheat and fail.13. The BJT is a ______________ terminal device.
Answer is C)
The BJT is a THREE terminal device.14. The circuits used for getting the desired and proper operating point are known as ______
Answer is D)
The operating point is a specific point within the operation characteristic of a technical device. It is also called as Quiescent point or Q-point.15. A Rectifier is used to convert ___________________
Answer is C)
A Rectifier is used to convert AC to DC16. Higher value of ripple factor indicates _________
Answer is C)
A higher value of ripple factor indicates that the rectifier's output has a larger AC component. Ripple factor is a measure of the quality of an AC power supply, and is the ratio of the peak-to-peak ripple voltage to the DC input voltage. A higher ripple factor indicates a poorer quality of power supply.17. The ripple factor of a Full-wave rectifier is _______________
Answer is A)
The ripple factor of a full-wave rectifier is 0.482, or 48.2%.18.The ripple factor of a Half-wave rectifier is _______________
Answer is B)
The ripple factor of a half-wave rectifier is 1.21. The ripple factor is the ratio between the RMS value of the AC voltage (on the input side) and the DC voltage (on the output side) of the rectifier.19. The Clipper is also called as_________________________
Answer is D)
Clipper circuits are the circuits that clip off or remove a portion of an input signal, without causing any distortion to the remaining part of the waveform. It is also known as the limiter circuit20. The Clamper is also called as_________________________
Answer is B)
A clamper is also known as a clamping circuit, DC voltage restorer, IC restorer, and AC signal level shifter.21. Diffusion current there will be movement from ___________________ concentration to ___________
Answer is B)
Diffusion current is the movement of charge carriers from a higher concentration to a lower concentration.22. Which rectifier has the least ratio of rectification _______________________
Answer is A)
Half-wave rectifiers are the simplest rectifiers and are less efficient than full-wave rectifiers. Half-wave rectifiers have a rectification efficiency of 40.6% and a ripple factor of 1.21,23. The base-emitter junction in a bipolar junction transistor (BJT) is _______ biased, while the base-collector junction is ______ biased.
Answer is C)
The base-emitter junction in a bipolar junction transistor (BJT) is forward biased, while the base-collector junction is reverse biased.24. Clippers circuits are used for_______________
Answer is A)
In electronics, a clipper is a circuit designed to prevent a signal from exceeding a predetermined reference voltage level25. Diode clamper circuit used for
Answer is C)
For improving the reverse recovery time, clampers are used.
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