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Electrical/Instrumentation Grade 3
Sample Test Questions

For each question, choose the single most correct answer.

<<click here for answer key>>
<<Click here for Math Formulas and Conversion Factors>>

Question #1
To test and calibrate a polyphase watt-hour meter using a single phase a.c. supply, the best method is to connect the :

a) voltage coils in series, current coils in parallel.
b) current coils in parallel, voltage coils in parallel.
c) current coils in series, voltage coils in parallel.
d) voltage coils in series, current coils in series.

Question #2
A pumping station that has two 100 HP pumps that operate 20% of the time each, 1½ HP sump pump that operates 2 hours a day, 5100 watt lights on a timer that burn from 6:00 P.M. to 5:00 A.M. and a 1 HP air compressors that operates a total of 3 hours a day, cost 8½ ¢ per KWH to operate. What is the cost per month (30 days) for power to run this lift station?

a) $10,007.50/mo
b) $9080.20/mo
c) $9932.50/mo
d) $1980.68/mo

Question #3
In a capacitive circuit what is the relationship of the current to the voltage?

a) Current leads voltage
b) Current in phase with voltage
c) Current and voltage both 90° out of phase
d) Current is 120° out of phase with voltage

Question #4.
What is the brake horsepower of a pump designated to deliver 5 cubic feet per second of water at a total head of 200 PSIG with an efficiency of 85%?

a) 240
b) 308
c) 328
d) 400

Question #5
The formula to calculate the Inductive Reactance of a coil is:

a)     

b)     

c)    

d)     

Question #6
Workers compensation laws have been enacted so that workers injured while on the job may receive benefit payments:

a) only if the injury was the employers fault.
b) only if the injury was the employee’s fault.
c) only if negligence on the part of the employer can be proved.
d) regardless of whose fault the injury was.

Question #7
Why is it necessary to limit the current carried by a wire?

a) To achieve maximum economy.
b) To guard against the danger of fire.
c) To increase the voltage factor.
d) To increase the demand factor.

Question #8
A heating appliance rated at 1000 watts at 240 volts is connected to 208 volts. What is the wattage?

a) 1153.8 watts
b) 866.6 watts
c) 1000 watts
d) 751.1 watts

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