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ECE > Quiz 1 (02) > Flashcards

Quiz 1 (02) Flashcards

1
Q

For an emitter feedback bias Circuit having, RE=1Kohm, RC= 4.7Kohm, IB=5μA, IE = 1mA, VCC = 12V and Vce = 5V. Find the value of beta

A

254

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2
Q

What is the Thevenin’s voltage (VTH) in a voltage divider bias circuit?

A

(VCCR2)/(R1+R2)

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3
Q

Which of the following is a trivalent doping element?

A

Boron, Indium, Aluminum

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4
Q

The reverse current in a diode is of the order of

A

μA

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5
Q

The average DC level voltage of the full wave rectifier using Silicon diodes is _______

A

Vdc = 0.636(Vm - 2VK)

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6
Q

The forward voltage drop across a silicon diode is about

A

0.7 V

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7
Q

An amplifier is designed using fixed bias configuration, what is its output impedance
(source Resistor is bypassed)?

A

RD || rd

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8
Q

What is the relation between the drain current and source current once the voltage crosses
pinch off?

A

ID = IS

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9
Q

Which of the following is a trivalent doping element?

A

Gallium

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10
Q

The three terminals of a bipolar junction transistor are called:

A

Emitter, Base, Collector

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11
Q

What is the Thevenin’s resistance (RTH) in a voltage divider bias circuit?

A

(R1R2)/(R1+R2)

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12
Q

The βDC of a transistor is its

A

Current Gain

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13
Q

Which of the following is a pentavalent doping element?

A

Phosphorous, Arsenic, Antimony, Bismuth

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14
Q

In the given transistor amplifier, RC = 2.2kΩ and r’e =20 Ω, the voltage gain is:

A

110

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15
Q

In cutoff, VCE is

A

Maximum

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16
Q

Essentially independent of βDC and Provides a stable bias point

A

Emitter Bias

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17
Q

A Unipolar and a voltage-controlled device

A

JFET

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18
Q

Which among the following is the most commonly used semiconductor?

A

Silicon

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19
Q

What happens to the resistance of a pure semiconductor when heated?

A

The resistance decreases

20
Q

How many valence electrons does a pentavalent impurity have?

A

5

21
Q

For a certain JFET, IGSS is 10nA at VGS = 10 V, the input resistance is:

A

1000 MΩ

22
Q

What is the effect of temperature on the recombination rate of electrons in electronic
circuits?

A

Recombination rate decreases with increase in the temperature

23
Q

Which of the following is wrong about solar cell electronic devices?

A

It produces dark current

24
Q

If the peak voltage on a centre tapped full wave rectifier circuit is 5V and diode cut in
voltage is 0.7. The peak inverse voltage on diode is_________

A

9.3V

25
Q

How many valence electrons does a pentavalent impurity have?

A

5

26
Q

Which of the following is created when trivalent impurities are added to a semiconductor?

A

Holes

27
Q

Which of the following does a hole in the semiconductor define?

A

An incomplete part of an electron pair bond

28
Q

An electron and a hole in close proximity would tend to _____.

A

attract each other

29
Q

Which of the following does the resistivity of a semiconductor depend upon?

A

Atomic nature of the semiconductor

30
Q

are made of semiconductor material in its purest form

A

Intrinsic semiconductors

31
Q

A pure semiconductor behaves like an insulator at 0 deg. K because

A

Free electrons are not available for current conduction

32
Q

The energy gap is much more in silicon than in germanium because

A

Its valence electrons are more tightly bound to their parent nucli

33
Q

A P-type semiconductor results when

A

A trivalent impurity is added to an intrinsic semiconductor

34
Q

An intrinsic semiconductor at absolute zero

A

Behaves like an insulator

35
Q

A semiconductor has…. temperature co-efficient of resistance.

A

Negative

36
Q

A doped semiconductor is also known as

A

Extrinsic semiconductor

37
Q

The diode is in __________ state if the current established by the applied sources is such that
its direction matches that of the arrow in the diode symbol, and VD ≥ 0.7V for Si and VD ≥
0.3V for Ge

A

ON

38
Q

A short circuit has a _________ drop across its terminals, and the current is limited only by the
surrounding network.

A

0 V

39
Q

What is the peak inverse voltage across each diode in a voltage doubler?

A

2 Vm

40
Q

The quiescent point (Q-point) is defined by a(n) __________.

A

DC network

41
Q

The x-intercept of the load line with the characteristic curve is determined by the _________.

A

source voltage

42
Q

As the load resistor increases, the slope of the dc load line and the levels of diode current
__________.

A

decrease

43
Q

. The PIV rating of the diodes in a full-wave rectifier must be larger than _______ Vm.

A

1

44
Q

When a diode is forward-biased, the anode:

A

Is positive relative to the cathode

45
Q

For a fixed bias circuit having RC=2Kohm and VCC=60V, IB=250 μA and β=100, find Vce.

A

10 V

ECE (13 decks)

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