Power Engineering Chapter 85
Showing posts with label Power Engineering Chapter 85. Show all posts
Showing posts with label Power Engineering Chapter 85. Show all posts

Relative to flow, velocity is kinetic energy and when velocity increases, the

Relative to flow, velocity is kinetic energy and when velocity increases, the



a) pressure and potential energy, will also increase
b) cross-sectional area of the piping will be increased
c) the mass quantity flowing per second will decrease
d) potential energy in the form of pressure will decrease
e) density will decrease







Answer: D

When a diaphragm device is used for boiler water level measurement, the boiler pressure is compensated for or off-set by

When a diaphragm device is used for boiler water level measurement, the boiler pressure is compensated for or off-set by




a) using a bellows on the HP side
b) a spring which balances the differential pressure
c) applying the pressure to both sides of the diaphragm
d) reversing the reference and variable legs
e) joining the reference and variable legs upstream of the device





Answer: C

A Bourdon tube is often in the shape of a spiral so that

A Bourdon tube is often in the shape of a spiral so that



a) its final output has less travel
b) gears can be used for final output
c) higher pressures can be sensed
d) more power and travel of the output occurs
e) its sensitivity will be decreased






Answer: D

The variable area meter consists of:

The variable area meter consists of:




a. A fluid being measured, flowing through the tube from the top to the bottom
b. A float across which the differential pressure varies
c. A tube that is of constant area
d. A tapered tube in which the fluid being measured flows through the tube from the bottom to the top
e. An opening that can be varied as required






Answer: D

A thermocouple will produce a signal which:

A thermocouple will produce a signal which:





a. Will be read on a pressure scale
b. Will be fully proportional to a temperature difference
c. Increases as temperature decreases
d. Is not quite proportional to temperature differences
e. Varies inversely with temperature





Answer: D

In an area flow meter, the flow is measured at:

In an area flow meter, the flow is measured at:



a. The bottom of the float
b. The top of the float
c. The edge of the float head
d. The outlet connection
e. Mid range of the float travel





Answer: C

Thermocouples require:

Thermocouples require:



a. A bi-metallic strip or coil
b. A thermopile
c. Two dissimilar metals
d. An elliptical sectioned tube
e. A heating element





Answer: C

Glass thermometers with a mercury fill, are sometimes pressurized with nitrogen so:

Glass thermometers with a mercury fill, are sometimes pressurized with nitrogen so:



a. They can be installed in any position
b. They can be used at a very low temperature
c. They can be used at higher temperatures
d. The vaporizing temperature of the mercury is lowered
e. The thermometer can be used at higher pressure



Answer: C

A thermocouple measures:

A thermocouple measures:



a. Pressure
b. Temperature
c. Flow
d. Velocity
e. Light




Answer: B

A chromatograph uses electronic devices which:

A chromatograph uses electronic devices which:



a. Utilize electrical current as a measurement base
b. Have inverse resistance properties relative to temperature
c. Increase in resistance as temperature rises
d. Work in conjunction with a thermocouple
e. Are made of Chromel and Alumel





Answer: B

The unit kg/m³ describes a material's

The unit kg/m³ describes a material's




a. Specific Gravity
b. Pressure
c. Density
d. Flexibility
e. Displacement





Answer: C

The inclined "U" tube manometer:

The inclined "U" tube manometer:



a. Will measure pressure in MPa
b. Can only be used with mercury
c. Is more accurate than the "U" tube manometer
d. Has two furnace connections
e. Is more difficult to read than the U-tube manometer




Answer: C
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