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Chapter 11

Instrumentation and Control Systems

QuestionAnswer
Pressure gauges can be calibrated in pounds per ? a. square foot b. cubic inch c. linear inch d. square inch d. square inch
When on end of a thermocouple is heated a small ? is produced a. voltage b. resistance c. pressure d. movement a. voltage
A steam pressure gauge should have a range of ? a. 1 to 1.5 times the safety valve setting b. 1.5 to 2 times the safety valve setting c. 2 to 2.5 the safety valve setting d. 1 10% of the MAWP b. 1.5 to 2 times the safety valve setting
A bubbler may also be called a ? a. pneumercator b. float c. opacity meter d. magnetostrictive sensor a. pneumercator
A steam pressure gauge must be protected from live steam by ? a. metal frame b. steam gauge guards c. a blower d. a siphon d. a siphon
Opacity smoke indicator alarms can be used to ? in the gases of combustion a. indicate an unexpected amount of particulate matter b. measure excess oxygen c. detect an unexpected amount of carbon monoxide d. none of the above a. indicate an unexpected amount of particulate matter
Vacuum gauges are calibrated in inches of ? atmospheric pressure a. mercury below b. water below c. mercury above d. water above a. mercury below
A control valve is an example of a ? a. primary element b. control element c. transmitter d. final element d. final element
Thermocouples measure? a. gauge pressure b. absolute pressure c. temperature d. oxygen content c. temperature
A temperature reading of ? can be made with a thermocouple a. superheated steam b. gases of combustion c. condensate return d. all of the above d. all of the above
Liquid level in a tank may be measured with a ? a. bubbler b. thermocouple c. pressure control d. tank chart c. pressure control
Flow meters measure the rate of flow of ? a. gases only b. liquids only c. solids d. a variety of fluids Both A and B
A differential pressure flow meter functions by measuring the difference in pressure across a ? a. pipe elbow b. restriction c. steam trap d. thermocouple b. restriction
A rotameter consists of a ? a. straight tube and a float b. tapered tube and a float c. straight tube d. none of the above b. tapered tube and a float
A variable area flow meter maintains a constant ? and allows the flow area to change with the flow rate a. differential pressure b. temperature c. diameter d. flow rate a. differential pressure
A ? measures a process variable a. primary element b. regulator c. transmitter d. actuator a. primary element
Thermometers used in a steam plant typically measure ? a. psig b. psia c. degrees F d. termocouple voltage c. degrees F
A ? is used to measure the difference in draft pressure between the atmosphere and the furnace, breeching, or stack a. a steam pressure gauge b. vacuum gauge c. resistance pressure detector d. draft gauge d. draft gauge
Absolute pressure is equal to ? a. gauge pressure minus atmospheric pressure b. gauge pressure plus atmospheric pressure c. atmospheric pressure d. gauge pressure plus steam pressure b. gauge pressure plus atmospheric pressure
A float is a level measuring instrument with a ? attached to it that floats on top of a liquid in a tank a. displacer b. pressure gauge c. hollow ball d. bubbler c. hollow ball
An ultrasonic sensor measures ? to determine level a. pressure difference b. voltage c. differential pressure d. transit time d. transit time
A boiler steam pressure gauge should be connected to the ? side of the boiler a. lowest part of the steam b. lowest part of the water c. highest part of the steam d. highest part of the water c. highest part of the steam
A ? is a flow restriction device consisting of a fabricated pipe section with a converging inlet section, straight throat, and a diverging outlet section a. venturi tube b. wobble plate c. orifice plate d. bourdon tube a. venturi tube
A ? pressure regulator is a regulator that uses upstream fluid as a pressure source to power the diaphragm of a larger valve a. pilot operated b. coriolis c. damper d. digital a. pilot operated
Created by: zmos89
 

 



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