Electrical Engineering Materials Mcqs Start Creating PDF

MCQ: The minority carrier concentration is largely a function of_____________?

1. forward biasing voltage
2. reverse biasing voltage
3. temperature
4. the amount of doping

MCQ: The current due to electron flow in conduction band is the hole current in valence band?

1. equal to
2. less than
3. greater than
4. any of the above

MCQ: For germanium the forbidden energy gap is_______________?

1. 0.15 eV
2. 0.25 eV
3. 0.5eV
4. 0.7eV

MCQ: is an element used in semiconductors whose atoms have three valence electrons?

1. An acceptor
2. A donor
3. Germanium
4. Silicon

MCQ: The carbon percentage is least in__________________?

1. low carbon steel
2. wrought iron
3. cast iron
4. malleable iron

MCQ: The conductivity of an extrinsic semiconductor with temperature________________?

1. decreases
2. increases
3. remains constant

MCQ: For a hole which of the following statements is incorrect ?

1. Holes can exist in certain semiconductors only
2. Holes can exist in any material including conductors
3. Holes may constitute an electric current
4. Holes can be considered as a net positive charge

MCQ: For a particular material the Hall coefficient was found to be zero. The material is______________?

1. insulator
2. metal
3. intrinsic semiconductor
4. none of the above

MCQ: Superconducting metal in super conducting state has relative permeability of________________?

1. zero
2. one
3. negative
4. more than one

MCQ: Which of the following factors affect resistivity of metals ?

1. Age hardening
2. Alloying
3. Temperature
4. Cold work
5. All of the above