Book 1 Unit 5

Question 1

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

Answer 1

A) Reversal of flow

Question 2

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)

Answer 2

E) 28 kPa (4 psi)

Question 3

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

Answer 3

A) Ease of assembly

Question 4

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

Answer 4

D) 90º

Question 5

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

Answer 5

E) Stop and check

Question 6

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

Answer 6

C) Packing

Question 7

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

Answer 7

A) Stop (or isolating)

Question 8

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

Answer 8

B) Tapered or straight cylinder

Question 9

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

Answer 9

E) Nominal pipe size

Question 10

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

Answer 10

D) Dissimilar metals

Question 11

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

Answer 11

B) Coupling collar

Question 12

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

Answer 12

E) Lower pressure

Question 13

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

Answer 13

C) Stock

Question 14

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)

Answer 14

E) 1038ºC (1900ºF)

Question 15

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

Answer 15

C) Male pipe threads

Question 16

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

Answer 16

D) All of the above

Question 17

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

Answer 17

E) One quarter turn

Question 18

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

Answer 18

D) Reamer

Question 19

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

Answer 19

C) 104ºC (219ºF)

Question 20

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

Answer 20

A) Mechanical