Related Questions

High resistivity materials are used in
A Precision instruments
B Heating elements
C Motor starters
D Incandescent lamps
E All of the above
Low resistivity materials are used in
A Transformer, motor and generator windings
B Transmission and distribution lines
C House wiring
D All above applications
Materials exhibiting zero value of resistivity are known as ______ .
A conductors
B semiconductors
C insulators
D superconductors
Which of the following has low resistivity?
A Nichrome
B Glass
C Ebonite
D Diamond
Which of the following has highest resistivity?
A Mica
B Paraffin wax
C Air
D Mineral oil
Which of the following has the lowest electrical resistivity?
A Graphite
B Fireclay
C Alumina
D Zircon
Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an
A Insulator
B Conductor
C Solid semi-conductor
D Liquid semi-conductor
On which of the following factors does the resistivity of a material depend ?
A Resistance of the conductor
B Area of the conductor section
C Length of the conductor
D All of the above
Which of the following affect greatly the resistivity of electrical conductors?
A Composition
B Pressure
C Size
D Temperature
Which of the following factors affect resistivity of metals ?
A Age hardening
B Alloying
C Temperature
D Cold work
E All of the above

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