chapter 18

Question 1

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

A.
Type of packing used

B.
Mass of the valve

C.
Manufacturer’s name or trademark

D.
Type of valve

E.
Size of the valve

Answer 1

C.
Manufacturer’s name or trademark

Question 2

Globe valves are ideal for:
Select one:

A.
Remote controlling

B.
Isolation valves

C.
Reducing flow friction

D.
Throttling valves

E.
Stop valves

Answer 2

D.
Throttling valves

Question 3

On a steam system the non-return stop valve is connected to the:
Select one:

A.
Safety valve outlet

B.
Continuous blowdown outlet

C.
Feedwater inlet

D.
Steam boiler outlet

E.
Blowdown outlet

Answer 3

D.
Steam boiler outlet

Question 4

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.
20 kPa (2.9 psi)

B.
10 kPa (1.5 psi)

C.
50 kPa (7.3 psi)

D.
100 kPa (14.5 psi)

E.
28 kPa (4 psi)

Answer 4

E.
28 kPa (4 psi)

Question 5

Valve stem leaks can normally be fixed by:
Select one:

A.
Slightly tightening the packing nut or gland

B.
Tightening the bonnet connection

C.
Slightly backing off the hand wheel

D.
Tightening the hand wheel nut

E.
Tightening the hand wheel down

Answer 5

A.
Slightly tightening the packing nut or gland

Question 6

The check valve is a valve which prevents _____ in piping.
Select one:

A.
Reversal of flow

B.
Low pressure

C.
High flow

D.
Low flow

E.
High pressure

Answer 6

A.
Reversal of flow

Question 7

The plug valve consists of a _____ containing a hole that is inserted into the cavity of the valve body.
Select one:

A.
Disc

B.
Diaphragm

C.
Ball

D.
Dashpot

E.
Tapered or straight cylinder

Answer 7

E.
Tapered or straight cylinder

Question 8

Gate valves consist of a gate-like disc, actuated by a screwed stem and hand wheel that moves _____ the path of flow.
Select one:

A.
Perpendicular with

B.
Up and down parallel to

C.
Counterclockwise with

D.
Up and down at right angles to

E.
Clockwise with

Answer 8

D.
Up and down at right angles to

Question 9

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

A.
Type of packing used

B.
Service designation

C.
Size of the valve

D.
Mass of the valve

E.
Type of valve

Answer 9

B.
Service designation

Question 10

On a hot water heating system the stop/balance check valve is also known as a _____ valve.
Select one:

A.
Non-return

B.
Temperature control

C.
Pressure balancing

D.
Double duty

E.
Triple duty

Answer 10

E.
Triple duty

Question 11

The maximum operating temperature for a butterfly valve is _____.
Select one:

A.
1200°C (2190°F)

B.
500°C (932°F)

C.
1100°C (2012°F)

D.
1000°C (1832°F)

E.
1500°C (2730°F)

Answer 11

C.
1100°C (2012°F)

Question 12

The actuator may be _____ operated.
Select one:

A.
Electrically

B.
All of the above

C.
Hydraulically

D.
Pneumatically

E.
None of the above

Answer 12

B.
All of the above

Question 13

All valves not properly or clearly identified should be:
Select one:

A.
Sold for scrap

B.
Used in non critical areas

C.
Rejected

D.
Kept for emergency use

E.
Used as they are available

Answer 13

C.
Rejected

Question 14

Valve packing surrounds the:
Select one:

A.
Packing gland

B.
Bonnet

C.
Disc

D.
Body

E.
Stem

Answer 14

E.
Stem

Question 15

The basic type of ball valve requires _____ from the fully open to the fully closed position.
Select one:

A.
Two turns

B.
One quarter turn

C.
One turn

D.
Five turns

E.
One half turn

Answer 15

B.
One quarter turn

Question 15

The valve gland contains the:
Select one:

A.
Disc

B.
Bonnet

C.
Packing

D.
Wheel

E.
Body

Answer 15

C.
Packing

Question 16

Valves can be manually operated or they can have a/an _____ to change and control the valve opening.
Select one:

A.
Assistant

B.
Driver

C.
Actuator

D.
Positioner

E.
Accumulator

Answer 16

C.
Actuator

Question 17

Which of the following application is a plug valve not suitable for?
Select one:

A.
Gas supply lines

B.
High pressure steam lines

C.
Chemical industries

D.
Water treatment plants

E.
Pulp and paper industries

Answer 17

B.
High pressure steam lines

Question 18

Butterfly Valves use a flat disc that can be rotated through _____ from the fully open to the fully closed position.
Select one:

A.
60°

B.
90°

C.
180°

D.
45°

E.
30°

Answer 18

B.
90°

Question 19

The non-return stop valve is also referred to as a _____ valve.
Select one:

A.
Stop and check

B.
Ball and stop

C.
Stop and gate

D.
Globe and stop

E.
Gate and check

Answer 19

A.
Stop and check

Question 20

Gate valves are suitable as _____ valves.
Select one:

A.
Throttling

B.
Stop (or isolating)

C.
Diverting

D.
Remote controlled

E.
Control

Answer 20

B.
Stop (or isolating)

Question 21

Another version of the globe valve is the _____ valve.
Select one:

A.
Needle

B.
Gate

C.
Plug

D.
Butterfly

E.
Ball

Answer 21

A.
Needle

Question 22

The valve stem connects the:
Select one:

A.
Disc to the yoke

B.
Yoke to the wheel

C.
Bonnet to the body

D.
Wheel to the bonnet

E.
Wheel to the disc

Answer 22

E.
Wheel to the disc

Question 23

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

A.
Type of packing used

B.
Size of the valve

C.
Type of valve

D.
Material designation

E.
Mass of the valve

Answer 23

D.
Material designation

Question 24

A valve bonnet leak is from the connection between the:
Select one:

A.
Bonnet and the body

B.
Bonnet and the gland

C.
Stem and the disc

D.
Bonnet and the disc

E.
Stem and the gland

Answer 24

A.
Bonnet and the body