ABE RURAL ELECTRIFICATION

How many square millimeters is AWG No. 10 wire?

• 8.0

• 2.6

• 5.5

• NOTA

If the unit of resistance is ohms, what is the unit of conductance?

• ohms

• rho

• langleys

• mhos

Unit for magnetic flux

• tesla

• flux

• magnetic flux

• weber

A parameter called power factor must be included in the computation of power in AC installation. This “safety” factor could take a value of except

• 0.05

• 0.99

• 1.0

• 1.2

A building plan requires the installation of 65 general-purpose outlets. How many 15-amp branch circuits are needed?

• 8

• 10

• 7

• 5

A motor draws 10 A from a 220-V supply at a power factor of 0.75. If the power delivered is 1.4 hp, what is the efficiency of the motor?

• 63.3%

• 47.5%

• 157.99%

• Cannot be determined

At what speed will a 14-pole, 60-cycle induction motor operate if the slip is 0.09?

• 864 rpm

• 648 rpm

• 468 rpm

• 486 rpm

When AWG #12 wire is replaced with AWG #14, the ampere capacity will:

• increase

• decrease

• same

• cannot be determined

The ratio of the average load to the maximum demand of a system.

• Demand Factor

• Load Factor

• Load Demand

• Power Factor

A prony-break test of a motor gave the following data: Force = 2 lb N = 1720 rpm Length of arm = 1 ft Electrical meter readings: Current = 11.4 A Voltage=110 V Power = 960 W. What is the actual power delivered by the motor as measured by the prony break test?

• 0.66 hp

• 1.8 hp

• 3.4 hp

• 2.25