Selenium is _____ semiconductor.
P-type
N-type
extrnisic
intmisic
intmisic
Spark plug makes use of which of the following materials for insulation ?
Slate
Asbestos
Porcelain
Glass
Porcelain
Superconducting metal in super conducting state has relative permeability of
zero
more than one
negative
one
zero
In graphite bonding is
Vander Waals and covalent
metallic
covalent
Vander Waals
Vander Waals and covalent
Total number of crystal systems is
12
7
2
4
7
The number of atoms per unit cell in B.C.C. structure is
8
1
2
4
8
Carbon resistors are used extensively because they are
inexpensive
compact
easy to make
all of the above reasons
all of the above reasons
Carbon rods are used in wet and dry cells because
carbon rod serves as conductor
carbon can resist the attack of battery acid
both and
either or
both and
Carbon bearings are used under which of the following conditions ?
All of the above
Where high temperature exists
Where corrosive chemical action exists
Where lubrication is difficult or im-possible
All of the above
Which of the following high resistance materials has the highest operating temperature ?
Kanthal
Nichrome
Manganin
Eureka
Kanthal
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