LMRC 2018 JE EC Exam: Tech Quiz 6

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Question 1

In figure v1 = 8 V and v2 = 4 V. Which diode will conduct?

• AD2 only
• BD1 only
• CBoth D1 and D2
• DNeither D1 nor D2

Question 2

The analog signal m(t) is given below  the Nyquist sampling time will be:

• A1/100
• B1/200
• C1/300
• D1/600

Question 3

The Boolean expression for the truth table shown is:

• A
• B
• C
• D

Question 4

Waveguides are used mainly for microwave signals because:

• AThey depend on straight-line propagation whichapplies to microwaves only
• BLosses would be too heavy at lower frequencies
• CThere are no generators powerful enough to excitethem at lower frequencies
• DThey would be too bulky at lower frequencies

Question 5

In an n-type semiconductor, as the donor concentration N_D increases, the Fermi level E_F:

• ARemains unaltered
• BMoves towards the conduction band
• CMove towards the center of forbidden energy gap
• DMay or may not move depending on temperature

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