Surface resistance of an insulating material is reduced due to the ?
A. smoky and dirty atmosphere
B. humidity in the atmosphere
C. both (A) and (b)
D. neither (A) nor (b)
C. both (A) and (b)
Electrical Engineering Materials MCQs
Electrical Engineering Materials MCQs. Multiple Choice Questions and Answers related to Electrical Engineering Materials in the field of Electronics and Electrical Engineering.
In conductors conduction of electricity takes place due to movement of ?
A. electrons only
B. positive ions only
C. negative ions only
D. positive and negative ions
A. electrons only
Effect of moisture on the insulating materials is to ?
A. decrease dielectric constant
B. decrease dielectric strength
C. decrease insulation resistance
D. increase dielectric loss
E. all of the above
E. all of the above
The minority carrier concentration is largely a function of ?
A. forward biasing voltage
B. reverse biasing voltage
C. temperature
D. the amount of doping
C. temperature
The current due to electron flow in conduction band is the hole current in valence band ?
A. equal to
B. less than
C. greater than
D. any of the above
C. greater than
For germanium the forbidden energy gap is ?
A. 0.15 eV
B. 0.25 eV
C. 0.5eV
D. 0.7eV
D. 0.7eV
The forbidden gap in an insulator is ?
A. large
B. small
C. nil
D. any of the above
A. large
If the resistance of a conductor does not vary in accordance with Ohm’s law it is known as ?
A. non-linear conductor
B. reverse conductor
C. bad-conductor
D. non-conductor
A. non-linear conductor
Due to which of the following fact, in India, aluminium is replacing copper ?
A. Aluminium is more ductile and malleable than copper
B. Aluminium is available in plenty, cheaper and lighter than copper
C. Aluminium has lower resistivity than that of copper
D. Aluminium has less temperature co-efficient than copper
B. Aluminium is available in plenty, cheaper and lighter than copper
Selenium is __________ semiconductor ?
A. extrnisic
B. intmisic
C. N-type
D. P-type
B. intmisic