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Electrical Engineering Materials(Engineering > Electrical Engineering ) Questions and Answers
Home
Topic
Engineering
Electrical Engineering
Electrical Engineering Materials
Question 1.
A carbon resistor contains
Carbon crystals
Solid carbon granules
Pulverized coal
Finely divided carbon black.
Explanation:-
Answer: Option D. ->
Finely divided carbon black.
Question 2.
The forbidden gap in an insulator is
Large
Small
Nil
Any of the above
Explanation:-
Answer: Option A. ->
Large
Question 3.
Which of the following material is not a semiconductor ?
Silica
Germanium
Selenium
Gallium-arsenide
Explanation:-
Answer: Option A. ->
Silica
Question 4.
Which of the following materials is preferred for transmitting electrical energy over long distance ?
Copper
Aluminium
Steel reinforced copper
Steel reinforced aluminium
Explanation:-
Answer: Option D. ->
Steel reinforced aluminium
Question 5.
Platinum is used in
Electrical contacts
Thermocouple
Heating element in high temperature furnace
Grids of special purpose vacuum tubes
All of the above
Explanation:-
Answer: Option E. ->
All of the above
Question 6.
In a crystal, an atom vibrates at a frequency determined by
The heat content of the crystal
The temperature of the crystal
The stiffness of the bonds it makes with neighbors
All of the above
Explanation:-
Answer: Option C. ->
The stiffness of the bonds it makes with neighbors
Question 7.
Due to which of the following reasons copper and aluminium are not used for heating elements ?
Both have great tendency for oxidation
Both have low melting point
Very large length of wires will be required
All of the above
Explanation:-
Answer: Option D. ->
All of the above
Question 8.
Which of the following high resistance materials has the highest operating temperature ?
Kanthal
Manganin
Nichrome
Eureka
Explanation:-
Answer: Option A. ->
Kanthal
Question 9.
Thermocouples are mainly used for the measurement of
Temperature
Resistance
Eddy currents
Coupling co-efficient
Explanation:-
Answer: Option A. ->
Temperature
Question 10.
The transition temperature of mercury is
18.0°K
9.22°K
4.12°K
1.14’K
Explanation:-
Answer: Option C. ->
4.12°K
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