Book 1: Unit 5 - Piping And Valves REVIEW

Question 1

The threads are cut by using a pipe die or die head, which is held in a frame called a:

Select one:

A. Threader
B. Stock
C. Collet
D. Reamer
E. Ratchet

Answer 1

B. Stock

Question 2

Gate valves are suitable as _____ valves.

Select one:

A. Stop (or isolating)
B. Throttling
C. Remote controlled
D. Control
E. Diverting

Answer 2

A. Stop (or isolating)

Question 3

The air present in steam lines and equipment must also be removed to prevent:

Select one:

A. Corrosion from oxygen
B. Rusting from carbon dioxide
C. Pitting from carbon dioxide
D. Caustic embrittlement
E. Corrosion from carbon dioxide

Answer 3

E. Corrosion from carbon dioxide

Question 4

Valve stem leaks can normally be fixed by:

Select one:

A. Tightening the hand wheel nut
B. Slightly backing off the hand wheel
C. Slightly tightening the packing nut or gland
D. Tightening the hand wheel down
E. Tightening the bonnet connection

Answer 4

C. Slightly tightening the packing nut or gland

Question 5

One of the general designs of gaskets is the ______ gasket.

Select one:

A. Hard
B. Fat
C. Round
D. Soft
E. Ring joint

Answer 5

E. Ring joint

Question 6

The valve stem connects the:

Select one:

A. Yoke to the wheel
B. Disc to the yoke
C. Bonnet to the body
D. Wheel to the disc
E. Wheel to the bonnet

Answer 6

D. Wheel to the disc

Question 7

Joining or connecting lengths of piping by the use of threaded pipe and screwed connections is generally used for pipe sizes _____ and smaller for low and moderate pressures.

Select one:

A. 1/2 in
B. 2 in
C. 3/4 in
D. 1 in
E. 3 in

Answer 7

B. 2 in

Question 8

The service temperature of Reflective Metal Insulation is above:

Select one:

A. 1000°C (1832°F)
B. 2250°C (4082°F)
C. 1650°C (3000°F)
D. 1040°C (1904°F)
E. 1200°C (2192°F)

Answer 8

D. 1040°C (1904°F)

Question 9

Joining or connecting lengths of piping by the use of threaded pipe and screwed connections has the advantage of:

Select one:

A. Gaskets are not required
B. The piping can be easily assembled or disassembled
C. The strength of the pipe is not reduced
D. There is no chance of leakage
E. A qualified welder must be used

Answer 9

B. The piping can be easily assembled or disassembled

Question 10

Before installing a trap blow new lines clear of all:

Select one:

A. Carbon dioxide
B. Condensate
C. Air
D. Foreign matter
E. Steam

Answer 10

D. Foreign matter

Question 11

Ideally with a hot water heating installation the minimum pressure of _____ should be maintained on the highest heating unit in the building.

Select one:

A. 28 kPa (4 psi)
B. 20 kPa (2.9 psi)
C. 50 kPa (7.3 psi)
D. 100 kPa (14.5 psi)
E. 10 kPa (1.5 psi)

Answer 11

A. 28 kPa (4 psi)

Question 12

All valves must be properly identified with one of the markings indicating the:

Select one:

A. Manufacturers name or trademark
B. Mass of the valve
C. Type of packing used
D. Size of the valve
E. Type of valve

Answer 12

A. Manufacturers name or trademark

Question 13

The purpose of the stream trap is to discharge ______ from steam lines and equipment without permitting steam to escape.

Select one:

A. Air and steam
B. Water and air
C. Condensate and air
D. Steam and condensate
E. Water and condensate

Answer 13

E. Water and condensate

Question 14

The slip expansion joint requires _____ then the expansion bend.

Select one:

A. Higher pressures
B. Higher temperatures
C. Less space
D. More space
E. Lower temperatures

Answer 14

C. Less space

Question 15

One of the different general classes of traps according to their principle of operation is the ______ trap.

Select one:

A. Thermodynamic
B. Pneumatic
C. Electronic
D. Electrical
E. Hydraulic

Answer 15

A. Thermodynamic

Question 16

No lubricant is used on the _____ because any excess lubricant is forced into the piping system.

Select one:

A. Outside of the fitting
B. Female fitting threads
C. Inside of the pipe
D. Both male pipe and female fitting threads
E. Male pipe threads

Answer 16

B. Female fitting threads

Question 17

The service temperature limit of refractory fiber insulation is:

Select one:

A. 1200°C (2192°F)
B. 2250°C (4082°F)
C. 1650°C (3000°F)
D. 1038°C (1900°F)
E. 1000°C (1832°F)

Answer 17

C. 1650°C (3000°F)

Question 18

Joining or connecting lengths of piping by the use of threaded pipe and screwed connections has the disadvantage of:

Select one:

A. The piping can not be easily assembled or disassembled
B. There is no chance of leakage
C. The strength of the pipe is reduced
D. A qualified welder must be used
E. Gaskets are not required

Answer 18

C. The strength of the pipe is reduced

Question 19

In the design of a mechanical trap a a/an ______ is used to open and close the trap outlet valve.

Select one:

A. Bellows
B. Temperature difference
C. Pressure difference
D. Bi-Metallic strip
E. Inverted bucket

Answer 19

E. Inverted bucket

Question 20

Threaded ______ pipe fittings cannot be used for gas service piping systems.

Select one:

A. Cast Iron
B. Steel
C. Malleable iron
D. Aluminum
E. Copper

Answer 20

A. Cast iron