CWEA E/I LEVEL 3 | COMPREHENSIVE EXAM WITH CORRECT SOLUTIONS

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CWEA E/I LEVEL 3 | COMPREHENSIVE EXAM
WITH CORRECT SOLUTIONS



A 115-volt, 2-KVA, single-phase generator operating at full load will deliver how
many amperes?
a. 0.23
b. 17.4
c. 57.5
d. 230 -correct-answer-b. 17.4




What is the current when a circuit has a 1,500- watt load and a power factor of
86%, and operates from
a three-phase 230-volt source?
a. 9.7 amps
b. 6.5 amps
c. 4.4 amps
d. 3.8 amps -correct-answer-c. 4.4 amps




What is the amp-load of a three-phase, 0.5-hp, 230-volt motor with an efficiency
rating of 92% and a
power factor of 80%?

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a. 1.27 amps
b. 1.19 amps
c. 2.55 amps
c. 4.41 amps -correct-answer-a. 1.27 amps




A three-phase, 460-volt motor draws a current of 52 amperes. The motor has an
efficiency rating of
94% and a power factor of 80%. What is the horsepower?
a. 24.1 hp
b. 41.7 hp
c. 50.0 hp
d. 73.8 hp -correct-answer-b. 41.7 hp




A 120-volt AC circuit draws a current of 5 amperes. Determine the power
consumption.
a. 60 watts
b. 120 watts
c. 4.8 watts
d. 600 watts -correct-answer-d. 600 watts




In a simple ratio system, the independent variable is:

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a. both measured and controlled.
b. controlled but not measured.
c. measured but not controlled.
d. neither measured nor controlled. -correct-answer-c. measured but not
controlled.




The root-mean-square method is used to calculate:
a. integral and derivative action.
b. proportional band or gain.
c. system accuracy.
d. transducer bias -correct-answer-c. system accuracy.




To simulate an RTD input, you use a:
a. digital VOM.
b. potentiometer.
c. resistance decade box.
d. wally box. -correct-answer-c. resistance decade box.




SCADA systems typically span:
a. an entire plant.