ETC ETC Electrical Systems & Instrumentation 2

Question 1

What is the function of a rectifier in an electrical system?

Accepted Answer

Converts AC to DC

Answer

Converts DC to AC

Answer

Steps up AC voltage

Answer

Filters out harmonics

Question 2

Which grounding method directly connects the neutral point of a transformer to earth?

Accepted Answer

Solid grounding

Answer

Resistance grounding

Answer

Isolation

Answer

Floating neutral

Question 3

What is the purpose of a power factor correction capacitor bank?

Accepted Answer

To reduce reactive power demand and improve power factor

Answer

To increase system frequency

Answer

To increase voltage at the load

Answer

To filter harmonic distortion

Question 4

What does IP65 rating indicate for electrical enclosures?

Accepted Answer

Dust-tight and protected against water jets

Answer

65 volts maximum operating voltage

Answer

65 ampere current rating

Answer

65% efficiency rating

Question 5

Which device is used to measure the insulation resistance of electrical cables?

Accepted Answer

Megohmmeter

Answer

Clamp meter

Answer

Oscilloscope

Answer

Power quality analyzer

Question 6

What is the purpose of a Variable Frequency Drive (VFD) in motor control?

Accepted Answer

To control motor speed by varying supply frequency and voltage

Answer

To reverse the direction of three-phase motors only

Answer

To provide overload protection only

Answer

To convert single-phase to three-phase power