Book 1 Unit 5 Flashcards
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) Reversal of flow
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)
E) 28 kPa (4 psi)
An advantage of plastic piping is:
A) Ease of assembly
B) Ease of corrosion
C) Resistance to high temperatures
D) High cost
A) Ease of assembly
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
D) 90º
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
E) Stop and check
The valve gland contains the:
A) Body
B) Wheel
C) Packing
D) Bonnet
E) Disc
C) Packing
Gate valves are suitable as _______ valves.
A) Stop (or isolating)
B) Remote controlled
C) Throttling
D) Control
E) Diverting
A) Stop (or isolating)
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
B) Tapered or straight cylinder
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
E) Nominal pipe size
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
D) Dissimilar metals
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
B) Coupling collar
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
E) Lower pressure
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
C) Stock
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)
E) 1038ºC (1900ºF)
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
C) Male pipe threads