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Quiz 4
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Q.1
Thermonic emission occurs in
Vacuum tubes
Copper conductors
Ferrite cores
Transistors
Q.2
High resistivity materials are used in
Precision instruments
Heating elements
Motor starters
Incandescent lamps
All of the above
Q.3
Low resistivity materials are used in
Transformer, motor and generator windings
Transmission and distribution lines
House wiring
All above applications
Q.4
By increasing impurity content in the metal alloy the residual resistivity always
Decreases
Increases
Remains constant
Becomes temperature independent
Q.5
Carbon bearings are used under which of the following conditions ?
Where lubrication is difficult or im-possible
Where corrosive chemical action exists
Where high temperature exists
All of the above
Q.6
Is an element used in semiconductors whose atoms have three valence electrons.
An acceptor
A donor
Germanium
Silicon
Q.7
The coils of D.C. motor starter are wound with wire of
Copper
Kanthal
Manganin
Nichrome
Q.8
The co-ordination number of a simple cubic structure is
2
4
6
8
Q.9
The conduction of electricity, in semiconductors, takes place due to movement of
Positive ions only
Negative ions only
Positive and negative ions
Electrons and holes
Q.10
In conductors conduction of electricity takes place due to movement of
Electrons only
Positive ions only
Negative ions only
Positive and negative ions
Q.11
The converse of hardness is known as
Malleability
Toughness
Softness
None of the above
Q.12
Which of the following resistive materials has the lowest temperature co-efficient of resistance ?
Nichrome
Constantan
Kanthal
Molybdenum
Q.13
The resistivity of a metal is a function of temperature because
The amplitude of vibration of the atoms varies with temperature
The electron density varies with temperature
The electron gas density varies with temperature
None of the above
Q.14
_______ is a hard solder.
Tin-lead
Tin-silver-lead
Copper-zinc
None of the above
Q.15
Copper, even though costly, finds use in the windings of electrical machines because
Copper points offer low contact resistance
Copper can be easily soldered and welded
Copper windings are less bulky and the machines become compact
All of the above
Q.16
_______ has zero temperature co-efficient of resistance.
Aluminium
Carbon
Porcelain
Manganin
Q.17
Which of the following is a semiconductor material ?
Phosphorous
Rubber
Silicon
Aluminium
Q.18
Most of the common metals have _________ structure.
Linear
Hexagonal
Orthorhombic
Cubic
Q.19
Which of the following materials does not have covalent bonds ?
Organic polymers
Silicon
Metals
Q.20
For germanium the forbidden energy gap is
0.15 eV
0.25 eV
0.5eV
0.7eV
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