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Quiz 3
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Q.1
In an ideal diode there is no breakdown, no __________ current, and no forward __________ drop.
Reverse, voltage
Forward, current
Forward, voltage
Reverse, current
Q.2
The dynamic resistance of a forward biased p-n diode
Varies inversely with current
Varies directly with current
Is constant
Is either constant or varies directly with current
Q.3
Each cell of a static Random Access memory contains
6 MOS transistor
4 MOS transistor, 2 capacitor
2 MOS transistor, 4 capacitor
1 MOS transistor and 1 capacitor
Q.4
Power diodes are generally
Silicon diodes
Germanium diodes
Either of the above
None of the above
Q.5
Which variety of copper has the best conductivity?
Pure annealed copper
Hard drawn copper
Induction hardened copper
Copper containing traces of silicon
Q.6
Work function is the maximum energy required by the fastest electron at 0 K to escape from the metal surface.
True
False
Q.7
What is the necessary a.c. input power from the transformer secondary used in a half wave rectifier to deliverW of d.c. power to the load?
1232 W
848 W
616 W
308 W
Q.8
When diodes are connected in series to increase voltage rating the peak inverse voltage per junction
should not exceed half the breakdown voltage
should not exceed the breakdown voltage
should not exceed one third the breakdown voltage
may be equal to or less than breakdown voltage
Q.9
Fermi level is the amount of energy in which
A hole can have at room temperature
An electron can have at room temperature
Must be given to an electron move to conduction band
None of the above
Q.10
In monolithic ICs, all the components are fabricated by
Diffusion process
Oxidation
Evaporation
None
Q.11
In which of these is reverse recovery time nearly zero?
Zener diode
Tunnel diode
Schottky diode
PIN diode
Q.12
Which one of the following is not a characteristic of a ferroelectric material?
High dielectric constant
No hysteresis
Ferroelectric characteristic only above the curie point
Electric dipole moment
Q.13
Permalloy is
A variety of stainless steel
A polymer
A conon-ferrous alloy used in aircraft industry
A nickel an iron alloy having high permeability
Q.14
The most commonly used semiconductor material is
Silicon
Germanium
Mixture of silicon and germanium
None of the above
Q.15
Hall effect is observed in a specimen when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is
Normal to both current and magnetic field
In the direction of current
Antiparallel to magnetic field
In arbitrary direction
Q.16
Forbidden energy gap in germanium at 0 K is about
10 eV
5 eV
2 eV
0.78 eV
Q.17
In the sale of diamonds the unit of weight is carat. One carat is equal to
100 mg
150 mg
200 mg
500 mg
Q.18
Assertion (A): A VMOS can handle much larger current than other field effect transistors.Reason (R): In a VMOS the conducting channel is very narrow.
Both A and R are true and R is correct explanation of A
Both A and R are true but R is not a correct explanation of A
A is true but R is false
A is false but R is true
Q.19
In a semiconductor diode, the barrier offers opposition to
Holes in P-region only
Free electrons in N-region only
Majority carriers in both regions
Majority as well as minority carriers in both regions
Q.20
As compared to bipolar junction transistor, a FET
Is less noisy
Has better thermal stability
Has higher input resistance
All of the above
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