Quiz 1 (02)

Question 1

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

Answer 1

254

Question 2

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

Answer 2

(VCCR2)/(R1+R2)

Question 3

Which of the following is a trivalent doping element?

Answer 3

Boron, Indium, Aluminum

Question 4

The reverse current in a diode is of the order of

Answer 4

μA

Question 5

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

Answer 5

Vdc = 0.636(Vm - 2VK)

Question 6

The forward voltage drop across a silicon diode is about

Answer 6

0.7 V

Question 7

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

Answer 7

RD || rd

Question 8

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

Answer 8

ID = IS

Question 9

Which of the following is a trivalent doping element?

Answer 9

Gallium

Question 10

The three terminals of a bipolar junction transistor are called:

Answer 10

Emitter, Base, Collector

Question 11

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

Answer 11

(R1R2)/(R1+R2)

Question 12

The βDC of a transistor is its

Answer 12

Current Gain

Question 13

Which of the following is a pentavalent doping element?

Answer 13

Phosphorous, Arsenic, Antimony, Bismuth

Question 14

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

Answer 14

110

Question 15

In cutoff, VCE is

Answer 15

Maximum

Question 16

Essentially independent of βDC and Provides a stable bias point

Answer 16

Emitter Bias

Question 17

A Unipolar and a voltage-controlled device

Answer 17

JFET

Question 18

Which among the following is the most commonly used semiconductor?

Answer 18

Silicon

Question 19

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

Answer 19

The resistance decreases

Question 20

How many valence electrons does a pentavalent impurity have?

Answer 20

5

Question 21

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

Answer 21

1000 MΩ

Question 22

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

Answer 22

Recombination rate decreases with increase in the temperature

Question 23

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

Answer 23

It produces dark current

Question 24

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_________

Answer 24

9.3V

Question 25

How many valence electrons does a pentavalent impurity have?

Answer 25

5

Question 26

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

Answer 26

Holes

Question 27

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

Answer 27

An incomplete part of an electron pair bond

Question 28

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

Answer 28

attract each other

Question 29

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

Answer 29

Atomic nature of the semiconductor

Question 30

are made of semiconductor material in its purest form

Answer 30

Intrinsic semiconductors

Question 31

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

Answer 31

Free electrons are not available for current conduction

Question 32

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

Answer 32

Its valence electrons are more tightly bound to their parent nucli

Question 33

A P-type semiconductor results when

Answer 33

A trivalent impurity is added to an intrinsic semiconductor

Question 34

An intrinsic semiconductor at absolute zero

Answer 34

Behaves like an insulator

Question 35

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

Answer 35

Negative

Question 36

A doped semiconductor is also known as

Answer 36

Extrinsic semiconductor

Question 37

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

Answer 37

ON

Question 38

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

Answer 38

0 V

Question 39

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

Answer 39

2 Vm

Question 40

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

Answer 40

DC network

Question 41

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

Answer 41

source voltage

Question 42

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

Answer 42

decrease

Question 43

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

Answer 43

1

Question 44

When a diode is forward-biased, the anode:

Answer 44

Is positive relative to the cathode

Question 45

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

Answer 45

10 V