# Electromagnetic compatibility - Electrical Engineering (MCQ) questions and answers

1)   For swept frequency measurements, the input impedance of the mismatched transmission line would vary with frequency as the electrical length of the transmission line would

a. Decrease with frequency
b. Remains same with change in frequency
c. Increase with frequency
d. Either (a) or (b)
 Answer  Explanation ANSWER: Increase with frequency Explanation: No explanation is available for this question!

2)   The output power of the cascaded amplifier / attenuator system can be determined using

a. Actual gain of amplifier
b. Actual gain of amplifier and attenuator
c. Gain in dB of amplifier and attenuator
d. Actual gain of attenuator
 Answer  Explanation ANSWER: Actual gain of amplifier and attenuator Explanation: No explanation is available for this question!

3)   LISN is a device used to measure conducted emissions. LISN stands for

a. Line integrated stabilization network
b. Line impedance stabilization network
c. Line integrated stored network
d. Laser integrated stabilization networking
 Answer  Explanation ANSWER: Line impedance stabilization network Explanation: No explanation is available for this question!

4)   In EMC signal, the source delivers maximum power to the input of transmission line when the transmission line input impedance

a. Is equal to the source resistance
b. Greater than the source resistance
c. Smaller than the source resistance
d. None of these
 Answer  Explanation ANSWER: Is equal to the source resistance Explanation: No explanation is available for this question!

a. Decays as 1 / R, where R is the separation distance between the emitter and the receptor
b. Decays as R, where R is the separation distance between the emitter and the receptor
c. Decays as 1 / 2 R, where R is the separation distance between the emitter and the receptor
d. Decays as 2R, where R is the separation distance between the emitter and the receptor
 Answer  Explanation ANSWER: Decays as 1 / R, where R is the separation distance between the emitter and the receptor Explanation: No explanation is available for this question!

6)   The effects of EMI can be reduced by

a. Suppressing emissions
b. Reducing the efficiency of the coupling path
c. Reducing the susceptibility of the receptor
d. All of these
 Answer  Explanation ANSWER: All of these Explanation: No explanation is available for this question!

7)   The opposite of susceptibility is

a. Immunity
b. Emission
c. Interference
d. Electromagnetic compatibility
 Answer  Explanation ANSWER: Immunity Explanation: No explanation is available for this question!

8)   The ability of an electronic system to function properly in its intended electromagnetic environment and should not be a source of pollution to that electromagnetic environment is known as

a. Susceptibility
b. Emission
c. Interference
d. Electromagnetic compatibility
 Answer  Explanation ANSWER: Electromagnetic compatibility Explanation: No explanation is available for this question!

9)   The man made noise sources is / are

a. Motors