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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