Electrical Engineering Mcqs

The strength of a semiconductor crystal comes from______________?

• (A)  Forces between nuclei
• (B)  Forces between protons
• (C)  Electron-pair bonds
• (D)  None of the above

Answer

Submitted By :Ali Uppal

A semiconductor is formed by ______________bonds?

• (A)  Covalent
• (B)  Electrovalent
• (C)  Co-ordinate
• (D)  None of the above

Answer

Submitted By :Ali Uppal

The resistivity of a pure silicon is about _______________?

• (A)  100 O cm
• (B)  6000 O cm
• (C)  3 x 105 O m
• (D)  6 x 10-8 O cm

Answer

Submitted By :Ali Uppal

When a pentavalent impurity is added to a pure semiconductor, it becomes________________?

• (A)  An insulator
• (B)  An intrinsic semiconductor
• (C)  p-type semiconductor
• (D)  n-type semiconductor

Answer

Submitted By :Ali Uppal

An n-type semiconductor is______________?

• (A)  Positively charged
• (B)  Negatively charged
• (C)  Electrically neutral
• (D)  None of the above

Answer

Submitted By :Ali Uppal

Addition of pentavalent impurity to a semiconductor creates many________________?

• (A)  Free electrons
• (B)  Holes
• (C)  Valence electrons
• (D)  Bound electrons

Answer

Submitted By :Ali Uppal

The leakage current across a pn junction is due to________________?

• (A)  Minority carriers
• (B)  Majority carriers
• (C)  Junction capacitance
• (D)  None of the above

Answer

Submitted By :Ali Uppal

With forward bias to a pn junction , the width of depletion layer__________________?

• (A)  Decreases
• (B)  Increases
• (C)  Remains the same
• (D)  None of the above

Answer

Submitted By :Ali Uppal

At room temperature, an intrinsic semiconductor has_______________?

• (A)  Many holes only
• (B)  A few free electrons and holes
• (C)  Many free electrons only
• (D)  No holes or free electrons

Answer

Submitted By :Ali Uppal

At room temperature, an intrinsic silicon crystal acts approximately as_______________?

• (A)  A battery
• (B)  A conductor
• (C)  An insulator
• (D)  A piece of copper wire

Answer

Submitted By :Ali Uppal