Electrical Engineering Mcqs

A forward biased pn junction diode has a resistance of the order of_____________?

• (A)  O
• (B)  kO
• (C)  MO
• (D)  None of the above

Answer

Submitted By :Ali Uppal

In a semiconductor, current conduction is due to________________?

• (A)  Only holes
• (B)  Only free electrons
• (C)  Holes and free electrons
• (D)  None of the above

Answer

Submitted By :Ali Uppal

The impurity level in an extrinsic semiconductor is about_______________of pure semiconductor ?

• (A)  10 atoms for 108 atoms
• (B)  1 atom for 108 atoms
• (C)  1 atom for 104 atoms
• (D)  1 atom for 100 atoms

Answer

Submitted By :Ali Uppal

The resistivity of pure germanium under standard conditions is about_______________?

• (A)  6 x 104 cm
• (B)  60 x cm
• (C)  3 x 106 cm
• (D)  6 x 10-4 cm

Answer

Submitted By :Ali Uppal

The most commonly used semiconductor is________________?

• (A)  Germanium
• (B)  Silicon
• (C)  Carbon
• (D)  Sulphur

Answer

Submitted By :Ali Uppal

A pentavalent impurity has______________Valence electrons?

• (A)  3
• (B)  5
• (C)  4
• (D)  6

Answer

Submitted By :Ali Uppal

A reverse bias pn junction has_____________?

• (A)  Very narrow depletion layer
• (B)  Almost no current
• (C)  Very low resistance
• (D)  Large current flow

Answer

Submitted By :Ali Uppal

The barrier voltage at a pn junction for germanium is about________________?

• (A)  5 V
• (B)  3 V
• (C)  Zero
• (D)  0.3 V

Answer

Submitted By :Ali Uppal

The random motion of holes and free electrons due to thermal agitation is called______________?

• (A)  Diffusion
• (B)  Pressure
• (C)  Ionisation
• (D)  None of the above

Answer

Submitted By :Ali Uppal

A hole and electron in close proximity would tend to________________?

• (A)  Repel each other
• (B)  Attract each other
• (C)  Have no effect on each other
• (D)  None of the above

Answer

Submitted By :Ali Uppal