Quiz #9

Question 1

The ground detection system, shown in the illustration EL-0009 for a low-voltage, three-phase system has a ground in line “A”. Therefore, lamp “A” will burn __________.

Answer 1

dimly or be out, and lamps “B” and “C” will burn brightly

Question 2

In the illustrated ground detection system with a ground

on phase A, if the switch is opened __________. EL-0009

Answer 2

all three lamps will
return to their normal
brightness indicating
that the bulbs are not
burnt out

Question 3

A ground detection system is shown in the illustration
for a three-phase ungrounded distribution system.
Which of the following statements describes the
conditions indicated if a full ground occurs in line “A”? EL-0009

Answer 3

Lamp “A” will go out
and Lamps “B” and
“C” will burn brightly

Question 4

A ground in an electrical circuit outside the engine room

__________.

Answer 4

is indicated by the
ground detecting
lamps on the main
switchboard

Question 5

Which of the following represents a characteristic of an

ungrounded electrical distribution system?

Answer 5

Accidental contact
between one line and
ground does not
cause an outage.