On a steam boiler with single element feedwater control, the following item is measured:

On a steam boiler with single element feedwater control, the following item is measured:

a) steam flow
b) feedwater flow
c) boiler water level
d) fuel flow
e) feedwater pressure







Answer: C

In a two element feedwater control the following items are measured:

In a two element feedwater control the following items are measured:

a) boiler water level and steam flow
b) feedwater flow and steam flow
c) boiler water level and feedwater flow
d) boiler water level and fuel flow
e) temperature and volume of feedwater



Answer: A

A boiler control transfer or selector station

A boiler control transfer or selector station

a) can be used to manually override automatic control loops
b) can be changed from manual to automatic without balancing
c) is located upstream of the controller in a control loop
d) output is directed to the primary element of a loop
e) must be operated in manual mode for only short periods




Answer: A

With single element feedwater control the level transmitter output is

With single element feedwater control the level transmitter output is

a) received by a final element
b) proportional to drum level
c) sent to a selector station
d) constant regardless of level
e) a function of steam flow




Answer: B

Boiler modulating feedwater control flow rate depends on

Boiler modulating feedwater control flow rate depends on

a) level set point
b) control valve position
c) actual level
d) feedwater pressure
e) set point, level, and valve position





Answer: E

Which of the following is a flame sensing device?

Which of the following is a flame sensing device?

a) thermopile
b) heat sensing control
c) stack relay
d) cut-off valve
e) scanner





Answer: E