LMRC 2018 JE EC Exam: Tech Quiz 8

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Question 1

The input impedance of op–amp circuit of figure is:

• A120 k ohm
• B110 k ohm
• CInfinity
• D10 k ohm

Question 2

The use of non-uniform quantization leads to:

• AReduction in transmission bandwidth.
• BIncrease in maximum SNR.
• CIncrease in SNR for signal levels.
• DSimplification of quantization process.

Question 3

The output of an AND gate with three inputs, A, B, andC, is HIGH when ________:

• AA = 1, B = 1, C = 0
• BA = 0, B = 0, C = 0
• CA = 1, B = 1, C = 1
• DA = 1, B = 0, C = 1

Question 4

For a transmission line open circuit and short circuit impedances are 20 Ω and 5 Ω. Then characteristic impedance is:

• A100 Ω
• B50 Ω
• C25 Ω
• D10 Ω

Question 5

The transconductance of a JFET is computed atconstant VDS by:

• ARatio of change in Idto change of Vgs
• BRatio of change inVgs to change ofId
• CProduct of change in Vgs to change of Id
• DRatio of change in Vds to change of Id

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