7-22.
What symbol should you use to show
7-24.
What valve symbol should you use
a screwed union in a piping plan?
for a hose valve?
7-23.
What valve symbol should you use
for a gate valve?
7-25.
Which of the following descriptions
best defines electrical
distribution?
1.
2.
3.
4.
The transmission of power from
the power plant to the
substations
The delivery of power from the
power plants or substations
through feeders and mains to
the building premises
The interior wiring of a
building
The overhead power lines that
extend from the substations to
the buildings
7-26.
Most land-based power systems use
what type of electrical current?
1.
Indirect
2.
Direct
3.
Alternating
4.
Variable
IN ANSWERING QUESTIONS 7-27 and 7-28,
REFER TO FIGURE 9-2 IN YOUR TEXTBOOK.
7-27.
The installation of a transformer
between the primary and secondary
main to the motor pool serves what
purpose?
1.
To reduce voltage
2.
To increase voltage
3.
To increase current flow
4.
To act as a safety device
45
