Question 1

A 55-kW motor at full load is used to drive a pump that generates 50 meters of head while pumping water at a rate of 5,000 liters per minute. Calculate the pump efficiency.

Options :

A : 58%

B : 62%

C : 74%

D : 88%

Answer: C

Question 2

A high-pressure steam system passes 180°C condensate (saturated liquid) through a steam trap to an atmospherically vented condensate receiver tank. If the steam trap is working properly, how much of the condensate mass can be lost out the vent of the receiver tank in the form of flash steam?

Options :

A : 6%

B : 15%

C : 25%

D : 66%

E : 100%

Answer: C

Question 3

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?

Options :

A : 0.8 (m²-°C)/Watt

B : 1.25 (m²-°C)/Watt

C : 2.20 Watt/m²

D : 20 Watt/(m²-°C)

E : 20 (m²-°C)/Watt

Answer: B

Question 4

Which of the following instruments is most useful for tracking long-term boiler performance?

Options :

A : The pressure gauge

B : The exhaust stack temperature sensor

C : The boiler room ambient temperature sensor

D : The drum water level gauge

E : The feedwater temperature sensor

Answer: B

Question 5

What term describes the difference between the control signal value and the set point?

Options :

A : Differential

B : Dead band

C : Error or offset

D : Cut off

E : Dead time

Answer: C

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