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Semiconductor Device
Quiz 1
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Q.1
In burglar alarm which type of diode is used
rectifier diode
zener diode
photo diode
Switching Diode
Q.2
A zener diode is a heavily doped pn junction which is always used in
Forward bias mode
cut off mode
Reverse bias mode
series of load resistor
Q.3
The characteristics of p-type semiconductors is includes
Majority carriers are electron
Has tendency to gain electron
Has tendency to donor electron
Easy to conduct electricity
Q.4
Which among these is NOT a semiconductor
Germanium
Silicon
Gallium Arsenide
Titanium
Q.5
In optocoupler LED and ............ are enclosed in one package
rectifier diode
photo transistor
zener diode
resistor
Q.6
Select the functions of a driver circuit in power electronics?
Amplify a control signal generated by a control circuit.
The interface between a control circuit and a power switch.
Protect the control circuit from damage.
All of above
Q.7
Selection of suitable power switches in any application depends on _____ and ______.
operating frequency
power capacity
power losses
Both A & B
Q.8
BJTs and IGBTs generate low on-state conduction power losses.
True
False
Q.9
Heat sinks can be used to dissipate heat produced by the forward conduction power losses.
True
False
Q.10
A semiconductor power device can conduct current when it is in forward-biased condition.
True
False
Q.11
Choose controllable power switches in these following list:
BJTs
Thyristors
MOSFETs
All of above
Q.12
The resistivity of a semiconductor lies between
(a)10 -6 Ωm to10-8 Ωm
n(b) 108 Ωm to1014 Ωm
(c) 10 -2 Ωm to104 Ωm
(d) none of these
Q.13
A simple diode rectifier circuit can convert: I. AC voltage to DC voltage II. DC voltage to AC voltage III. Small AC voltage to a large AC voltage
I only
II only
III only
I and II only
I and III only
Q.14
Which of the following statements is NOT the diode application in electronic circuit?
Diode as voltage regulator
Diode as Rectifier
Diode as Amplifier
Diode as solar cell
Q.15
When diode is operated in forward bias mode it offers very low resistance in the circuit
true
false
Q.16
In zener diode construction to have tunneling current the metallurgical junction is very sharp and doping is high
true
false
Q.17
In the reverse bias operation diode offers high resistance in the circuit
true
false
Q.18
Let np and ne be the number density of holes and conduction electrons respectively in a semiconductor. Then,
np > ne in an intrinsic semiconductor, I < Ip + Ie
np = ne in an extrinsic semiconductor, I > Ip + Ie
np = ne in an intrinsic semiconductor, I = Ip + Ie
np > ne in an intrinsic semiconductor, I = 0( Here, Ip = current due to holes,Ie= current due to electrons, I= total current)
Q.19
Zener diode is always used in reverse bias
true
false
Q.20
Is the element added to the type N semiconductors.
Antimony
Boron
Chlorine
Argon
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