Plant Ops Chapter 93

A compound gauge shows both:
a. Pressure and vacuum
b. Kilopascals and Pounds per square inch
c. Pressure and temperature
d. Pressure and head

An outside screw and yoke valve:
Choose one answer.
a. Must be a gate valve
b. Readily shows its operating position
c. Is difficult to lubricate
d. Requires no packing
e. Has a non-rising stem

The working medium in the dead weight tester is

a) air
b) water
c) heavy oil
d) medium weight oil
e) alcohol

An indication of a pressure gauge not performing properly is:
Choose one answer.
a. The needle fluctuating
b. The needle not returning to zero when gauge is depressured
c. The safety valve popping when gauge reads normal
d. A reading that is not the same as some other gauge
e. A dial that rotates

The prime importance of boiler fittings is:
Choose one answer.
a. Economics
b. To satisfy regulations
c. Safety & efficiency
d. Convenience
e. Ease of operations

The purpose of the pipe siphon installed between the boiler and the pressure gauge is to prevent:
Choose one answer.
a. Air from entering the gauge
b. Water from entering the gauge
c. Hot steam from entering the gauge
d. Air from entering the boiler
e. Condensate returning to the boiler from the pigtail

All boiler fittings not properly or clearly identified should be:
Choose one answer.
a. Rejected
b. Used for low pressure services only
c. First approved for use by the boiler inspector
d. Acceptable for most powerhouse applications.
e. Sent back to the manufacturer for proper identification.

A globe valve should be used in the feedwater line:
Choose one answer.
a. At all times
b. Whenever it may be used for throttling purposes
c. Only if it is of the outside screw and yoke type
d. When the system is of multi-boiler installation
e. Because of its low resistance to flow

The cross-section of a Bourdon tube is generally

a) circular
b) round
c) cylindrical
d) spherical
e) oval

Which of the following units would the pressure gauge on a steam boiler likely use?
Choose one answer.
a. Pascals
b. Pascals per square metre
c. Kilograms per square centimeter
d. Kilograms per hour
e. Kilopascals

One purpose of the small valve on top of the shell or the water column on most boilers is to:
Choose one answer.
a. Signal when the boiler is full of water r.
b. allow water into the boiler when the boiler is being drained or cooled preventing the formation of a vacuum.
c. allow water to escape before the steam stop valve is opened during the warm-up period.
d. allow air to escape from the boiler when the boiler is being filled with water.
e. allow air into the boiler when the boiler is being filled with water.

A boiler feedwater stop valve:
Choose one answer.
a. Should never be used to control water level
b. Is used to isolate the deaerator
c. Must be a globe valve
d. Should be located close to the feedwater pump
e. May be a globe valve, provided water enters below the disc

When the steam outlet of a boiler is 51mm or larger, the boiler steam outlet stop valve should be a:
Choose one answer.
a. Non-rising stem globe valve
b. Rising spindle gate or globe valve
c. Non-rising spindle gate valve
d. Rising spindle plug valve
e. Motorized butterfly valve

A function of a Bourdon tube gage hairspring is

a) return the tube to its zero position
b) keep the pointer on zero
c) eliminate backlash
d) return the pointer to zero
e) eliminate pointer linearity

A boiler feedwater stop valve:
Choose one answer.
a. Should never be used to control water level
b. Is used to isolate the deaerator
c. Must be a globe valve
d. Should be located close to the feedwater pump
e. May be a globe valve, provided water enters below the disc

An essential fitting between the boiler and the steam pressure gauge is a:
Choose one answer.
a. Check valve
b. Gate valve
c. Gauge glass
d. Siphon
e. Steam trap

As the boiler pressure increases, the bourdon tube of the
pressure gauge will

a) tend to straighten
b) compress more
c) become less circular in cross-section
d) become smaller in diameter
e) tend to twist

When installing a siphon it

a) must be perpendicular to the piping
b) must be dry
c) should be downstream of an inspectors' test connection
d) should be first filled with water
e) shall be as close

When using a dead weight tester, the effect of friction:
Choose one answer.
a. Is reduced by rotating the platform
b. Will cause a higher than desired reading
c. Is negligible
d. Is eliminated with a lubricant
e. Is compensated for mathematically

An inspector's test connection for a boiler pressure gauge:
Choose one answer.
a. Should be located upstream of a siphon
b. Should be of 12.7 mm NPT size
c. Is required on all boilers
d. Shall be located adjacent to the boiler's pressure gauge
e. Is mandatory by code on LP boilers only

The purpose of the tee fitting on the piping leading to a boiler steam pressure gauge is to:
Choose one answer.
a. Bypass the siphon tube
b. Test a sample of steam for purity
c. Install the boiler inspector's pressure gauge
d. Blowoff condensate from the pigtail
e. Vent air from the pressure gauge

A steam boiler is regularly blown off in order to:
Choose one answer.
a. Clean the soot and carbon out of the firebox and tubes
b. Lower the operating water level in the boiler
c. Discharge sediment and scale forming matter from the boiler
d. Test the rated relieving capacity of the safety valves fitted to the boiler
e. Restore the drum level

Boiler blowoff piping:
Choose one answer.
a. Can be reduced in size after the blowdown valves
b. Must be full size to the point of discharge
c. Must be at least 51 mm in size
d. Can have valves of a smaller size than piping
e. May discharge to the sewer system

On a multiple steam boiler heating system, a stop valve must be placed at each boiler outlet to:
Choose one answer.
a. Permit slower system warm-ups
b. Allow the boiler to be isolated from the system
c. Prevent steam from entering another boiler
d. Allow each boiler to supply only a part of the system
e. Permit different system pressures

The minimum size of the blowoff piping of a steam heating boiler is:
Choose one answer.
a. 75 mm
b. 51 mm
c. 20 mm
d. 19 mm
e. 15 mm

Boiler blowoff piping has a specific size range, depending upon:
Choose one answer.
a. Water impurities
b. The type of boiler
c. Boiler capacity
d. Operating pressure
e. Blowoff line length

How many blow-off valves does a steam heating boiler require?
Choose one answer.
a. None
b. One
c. Two
d. Three
e. Four

According to code, the scale of a pressure gauge for a steam heating boiler shall be graduated between
Choose one answer.
a. 100 to 300 kPa
b. 200 to 414 kPa
c. 200 to 300 kPa
d. 125 to 325 kPa
e. 230 to 414 kPa