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Certified Energy Manager (CEM) Questions and Answers

Question 21

A 50-Hz alternating current (AC) induction motor has 3 pole pairs (6 poles). What is the synchronous speed of the motor?

600 rpm

750 rpm

1,000 rpm

1,500 rpm

Question 22

Which motor parameter is the most difficult to measure with precision?

Operating (rotating) speed

Output power capacity

Input power

Alternating current (AC) frequency

Operating load factor

Question 23

What instrument determines flow rate by measuring pressure differential?

Psychrometer

Infrared camera

Hot-wire anemometer

Pitot tube

Ultrasonic flow meter

Question 24

Insulation has a thermal conductivity of 0.04 Watt/(m-°C). What is the R-value for this insulation when it is 5-cm thick?

0.8 (m²-°C)/Watt

1.25 (m²-°C)/Watt

2.20 Watt/m²

20 Watt/(m²-°C)

20 (m²-°C)/Watt