Electrical Engineering Materials Objective type Questions - Set 07 - ObjectiveBooks

Electrical Engineering Materials Objective type Questions - Set 07

Practice Test: Question Set - 07

1. For a hole which of the following statements is incorrect?
    (A) Holes can exist in certain semiconductors only
    (B) Holes can exist in any material including conductors
    (C) Holes may constitute an electric current
    (D) Holes can be considered as a net positive charge

2. Thermocouples are mainly used for the measurement of
    (A) Temperature
    (B) Resistance
    (C) Eddy currents
    (D) Coupling coefficient

3. The impurity atoms is semiconductors
    (A) Inject more charge carriers
    (B) Reduce the energy gap
    (C) Increase the kinetic energy of valence electrons
    (D) All of the above

4. ________ is a hard solder.
    (A) Tin-lead
    (B) Tin-silver-lead
    (C) Copper-zinc
    (D) None of the above

5. At transition temperature the value of critical field is
    (A) Zero
    (B) Negative real value
    (C) Positive real value
    (D) Complex value

6. The conductivity of a conductor can be increased by
    (A) Decreasing its temperature
    (B) Increasing its temperature
    (C) Decreasing its vibration
    (D) Increasing its vibration

7. The formula _______ determines the number of electrons that can be accommodated in any level.
    (A) 2n2
    (B) 4n2
    (C) 2n3
    (D) 4n4

8. Due to which of the following reasons aluminium does not corrode in atmosphere?
    (A) Aluminium is a noble metal
    (B) Atmospheric oxygen can only diffuse very slowly through the oxide layer which is formed on the surface of aluminium
    (C) No reaction with oxygen occurs
    (D) Any of the above

9. Which of the following is a semiconductor material?
    (A) Phosphorous
    (B) Rubber
    (C) Silicon
    (D) Aluminium

10. The conductivity of an extrinsic semiconductor with temperature
    (A) Decreases
    (B) Increases
    (C) Remains constant
    (D) None of the above

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