Module 2

Question 1

The potential difference between two conductors which are insulated from each other is measured in?

Answer 1

volts

Question 2

The basic unit of electrical quantity is the?

Answer 2

coulomb

Question 3

The major advantage of alternating current (AC) over direct current (DC) is the fact that its current and voltage can easily be increased or decreased by means of a/an?

Answer 3

transformer

Question 4

If a 12V electric motor has 1,000 watt input with 1HP output, how much input power (Watts) at the same efficiency would a 24V, 1 HP motor require?

Answer 4

1,000 watts

Question 5

a 1HP, 24V DC electric motor, 80% Efficient, requires 932.5 watts. How much power would a 1HP 12V DC motor 75% efficient require?

Answer 5

994.6 watts

Question 6

Which require the most electrical power during operation, as 12V 9 Amp motor; four 30W lamps in a 12vv parallel circuit; or Two, 3 amp lights in a 24V parallel circuit?

Answer 6

two 3amps lights in a 24V parallel circuit.

Question 7

Which requires the most electrical power: 1 1/5HP motor which is 75% efficient; four 30-watt lamps in a 12v parallel circuit, or a 24V anti-collision light circuit of two light assemblies which require 3 amps each?

Answer 7

The 1/5 HP motor operating @ 75% efficiency (uses 198.93 watts of power)

Question 8

How much power must a 24V generator produce for a system that contains one 1/5 HP motor that is 75% efficient; Three 20W lights, one 5 amp hearing element and one 3 amp light (1HP = 746W)

Answer 8

451 Watts

Question 9

What is the operating resistance of a 30-watt light bulb designed for a 28 volt system?

Answer 9

26 OHMS