Book 1 Unit 5 Flashcards

1
Q

The check valve is a valve which prevents ____________ in piping.
A) Reversal of flow
B) High flow
C) Low flow
D) High pressure
E) Low pressure

A

A) Reversal of flow

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2
Q

Ideally with a hot water heating installation the minimum pressure of __________ should be maintained on the highest heating unit in the building.
A) 100 kPa (14.5 psi)
B) 20 kPa (2.9psi)
C) 10 kPa (1.5 psi)
D) 50 kPa (7.3 psi)
E) 28 kPa (4 psi)

A

E) 28 kPa (4 psi)

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3
Q

An advantage of plastic piping is:
A) Ease of assembly
B) Ease of corrosion
C) Resistance to high temperatures
D) High cost

A

A) Ease of assembly

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4
Q

Butterfly valves use a flat disc that can be rotated through _______ from the fully open to the fully closed position.
A) 60º
B) 45º
C) 180º
D) 90º
E) 30º

A

D) 90º

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5
Q

The non-return stop valve is also referred to as a ________ valve.
A) Stop and gate
B) Globe and stop
C) Ball and stop
D) Gate and check
E) Stop and check

A

E) Stop and check

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6
Q

The valve gland contains the:
A) Body
B) Wheel
C) Packing
D) Bonnet
E) Disc

A

C) Packing

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7
Q

Gate valves are suitable as _______ valves.
A) Stop (or isolating)
B) Remote controlled
C) Throttling
D) Control
E) Diverting

A

A) Stop (or isolating)

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8
Q

The plug valve consists of a ________ containing a hole that is inserted into the cavity of the valve body.
A) Diaphragm
B) Tapered or straight cylinder
C) Dashpot
D) Disc
E) Ball

A

B) Tapered or straight cylinder

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9
Q

The diameter of commercial pipe is measured by its:
A) Natural pipe size
B) Inside diameter
C) Outside diameter
D) Wall thickness
E) Nominal pipe size

A

E) Nominal pipe size

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10
Q

In a bimetal steam trap, ____________ are welded together.
A) Strips of tin
B) High temperature strips of plastic
C) Strips of iron and constantan
D) Dissimilar metals
E) Strips of copper

A

D) Dissimilar metals

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11
Q

The grooved pipe system uses a joining connection made with a/an ___________ that also serves as a union between the fitting and the piping.
A) Adaptor
B) Coupling collar
C) Elbow
D) Flange fitting
E) Quick couple

A

B) Coupling collar

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12
Q

Welded steel pipe made from flat steel plates that are rolled and welded is used for _________ service.
A) Steam
B) Higher pressure
C) Water
D) Oil
E) Lower pressure

A

E) Lower pressure

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13
Q

The threads are cut by using a pipe die or die head, which is held in a frame called a:
A) Reamer
B) Threader
C) Stock
D) Ratchet
E) Collet

A

C) Stock

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14
Q

The service temperature limit of Mineral Fibre (Rock Slag Wool) insulation is:
A) 320ºC (608ºF)
B) 650ºC (1200ºF)
C) 454ºC (850ºF)
D) 104ºC (219ºF)
E) 1038ºC (1900ºF)

A

E) 1038ºC (1900ºF)

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15
Q

Before assembly the threads must be thoroughly cleaned and a small amount of thick lubricant, sometimes called pipe dope, is applied to the:
A) Inside of the fitting
B) Inside of the pipe
C) Male pipe threads
D) Both male and female threads
E) Female threads

A

C) Male pipe threads

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16
Q

The actuator may be _________ operated.
A) Electrically
B) Pneumatically
C) Hydraulically
D) All of the above
E) None of the above

A

D) All of the above

17
Q

The basic type of ball valve requires __________ from the fully open to the fully closed position.
A) One turn
B) Two turns
C) One half turn
D) Five turns
E) One quarter turn

A

E) One quarter turn

18
Q

When pipe is cut with a wheel and roller cutter, a burr is left on the inside of the pipe that is removed with a pipe.
A) Cutter
B) Threader
C) Bender
D) Reamer
E) Cleaner

A

D) Reamer

19
Q

The service temperature limit of Elastomeric insulation is:
A) 650ºC (1200ºF)
B) 454ºC (850ºF)
C) 104ºC (219ºF)
D) 1038ºC (1900ºF)
E) 320ºC (608ºF)

A

C) 104ºC (219ºF)

20
Q

One of the different general classes of traps according to their principle of operation is the _________ trap.
A) Mechanical
B) Hydraulic
C) Pneumatic
D) Electrical
E) Electronic

A

A) Mechanical