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# Electronic Devices & EMMI Questions

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In a semiconductor diode, the barrier offers opposition to

Aholes in Pregion only

Bfree electrons in Nregion only

Cmajority carriers in both regions

Dmajority as well as minority carriers in both regions

Explanation:

Immobile ions of  barrier oppose majority carrier difussion of p and n sides

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Consider the junction diode as ideal. The value of current flowing through

A10^-1 A

B10^-3 A

C100 A

D10^-2A

Explanation:

Vab = 4-(-6)=10V I=V/R = 10/1000 = 10^-2A

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In semiconductors at a room temperature

AThe valence band is completely filled and the conduction band is partially filled

BThe valence band is completely filled

CThe conduction band is completely empty

DThe valence band is partially empty and the conduction band is partially filled

Explanation:

At room temperature, a semiconductor has enough free electrons to allow it to conduct current. This is onl;y posible when there are some free electrons in the conduction band.

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An AM demodulator can be implemented with a linear multiplier followed by a ________ filter.

ALow pass

BHigh-pass

CBand-pass

DBand-stop

Explanation:

Block Diagram of AM DEMODULATOR. After the rectifier a Low Pass filter is used to remove unwanted frequencies.

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In a regulated supply, what term describes how much change occurs in the output voltage over a certain range of load current values, from minimum to maximum current?

Aline regulation

Bvoltage regulator

Ccurrent regulator

Explanation:

Load regulation is the capability to maintain a constant voltage (or current) level on the output channel of a power supply despite changes in the supply's load (such as a change in resistance value connected across the supply output).

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Which of the following is true?

ACC amplifier has a large current gain

BCE amplifier has a large current gain

CCB amplifier has low voltage gain

DCC amplifier has low current gain

Explanation:

The Common Emitter amplifier has high current and voltage gains. The Common Collector amplifier has unity voltage gain which cannot be regarded as high. The Common base amplifier has a unity current gain and high voltage gain.

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