JEE 2020 Revision Quiz :Semiconductor Electronics & Communication System

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Question 1

If Boolean function is expressed as . What is the minimum number of NAND gates required to express this Boolean function.

• A3
• B2
• C1
• DNone

Question 2

If Boolean function is represented as . How many minimum number of gates are required to represent this Boolean function if not all gates are same.

• A2
• B3
• C4
• D5

Question 3

In a circuit containing npn transistor, the collector current is 10 mA. It is found that 90 percent of the electrons from the emitter reach the collector then

• AThe base current will be 1.11 mA
• BThe base current will be 2 mA
• CThe emitter current will be 19 mA
• DThe emitter current will be 14 mA

Question 4

Statement 1: A transistor cannot be used as a rectifier.
Statement 2: Either the emitter – base or the base- collector alone can be used as rectifier.
Reason: Base is thin and lightly doped.

• AStatement 1 is true and explained by reason while statement 2 false
• BStatement 2 true explained by reason, Statement 1 false.
• CStatement 1 and Statement 2 true explained by reason.
• DStatement 1 and Statement 2 false explained by reason.

Question 5

Degenerate semiconductors satisfy which of the following conditions

• AHeavily doped p- or n- type with fermi level above conduction level or below valance level
• BLightly doped p- or n- type with fermi level above conduction level or below valance level
• CHeavily doped p- or n- type with fermi level below conduction level or above valance level
• DLightly doped p- or n- type with fermi level below conduction level or above valance level

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