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ESE-2018 Achiever Study Plan Electrical Material Quiz 2
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Question 1
Consider the following statements :
The intrinsic carrier concentration of a semiconductor
1) Depends on doping
2) Increases exponentially with decrease of band gap of the semiconductor
3) Increases non–linearly with increase of temperature
4) Increases linearly with increase of temperature
Which of the above statements are correct?
Question 2
A copper conductor has a resistance 15.5 Ω at 0°C. What is its percentage conductivity at 16°C (to nearest unit value) assuming the temperature coefficient of copper as 0.00428/°C at 0°C?
Question 3
The temperature coefficient of resistance of a wire is 0.0008/oC. If the resistance of the wire is 8 ohm at 0oC, what is the resistance at 100oC?
Question 4
In the case of a dielectric subjected to an alternating electric field of frequency f, the dielectric loss is proportional to which one of the following?
Question 5
Assertion (A) : Magnetic cores are generally used in main memory of a digital computer.
Reason (R) : magnetic cores are slow and volatile.
A. Both A and R are true and R is the correct explanation of
Reason (R) : magnetic cores are slow and volatile.
A. Both A and R are true and R is the correct explanation of
Question 6
Match List-I (Material) with List-II (Application) and select the correct answer using the code given below nthe lists:
List-I
A) Silicon steel
B) Ferrites
C) Alnico
List-II
1) High frequency transformers
2) Permanent magnets
3) Current transformers
4) Power transformers
List-I
A) Silicon steel
B) Ferrites
C) Alnico
List-II
1) High frequency transformers
2) Permanent magnets
3) Current transformers
4) Power transformers
Question 7
Consider the following statements regarding magnetic material :
1) Relative permeability of water is 0.99999 and that of oxygen is 1.00002; hence water is diamagnetic and oxygen is paramagnetic material.
2) Ferrimagnetic material has no eddy current loss.
3) Permalloy and Ainico are two examples of hard magnetic materials.
4) The magnetization and applied electric field in ferro-magnetic materials are related non- linearly.
Which of the statements given above are correct ?
1) Relative permeability of water is 0.99999 and that of oxygen is 1.00002; hence water is diamagnetic and oxygen is paramagnetic material.
2) Ferrimagnetic material has no eddy current loss.
3) Permalloy and Ainico are two examples of hard magnetic materials.
4) The magnetization and applied electric field in ferro-magnetic materials are related non- linearly.
Which of the statements given above are correct ?
Question 8
For intrinsic GaAs, the room-temperature electrical conductivity is 10-6(ohm-m)-1, the electron and hole mobilities are, mobilities are, respectively, 0.85 and 0.04 m2/V-s. What is the intrinsic carrier concentration ni at the room temperature?
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Sep 7ESE & GATE EE
