Book 1: 5-18 - Introduction to Valves

Question 1

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

Select one:

A. Gate and check
B. Ball and stop
C. Globe and stop
D. Stop and gate
E. Stop and check

Answer 1

E. Stop and check

Question 2

The check valve is a valve which prevents _____ in piping.

Select one:

A. High pressure
B. Low flow
C. Low pressure
D. Reversal of flow
E. High flow

Answer 2

D. Reversal of flow

Question 3

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

Select one:

A. Pressure balancing
B. Temperature control
C. Triple duty
D. Double duty
E. Non-return

Answer 3

C. Triple duty

Question 4

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

Select one:

A. One half then
B. Five turns
C. One turn
D. Two turns
E. One quarter turn

Answer 4

E. One quarter turn

Question 5

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

Select one:

A. Pulp and paper industries
B. Gas supply lines
C. High pressure steam lines
D. Chemical industries
E. Water treatment plants

Answer 5

C. High pressure steam lines

Question 6

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

Select one:

A. Ball
B. Disc
C. Dashpot
D. Diaphragm
E. Tapered or straight cylinder

Answer 6

E. Tapered or straight cylinder

Question 7

Globe valves are ideal for:

Select one:

A. Throttling valves
B. Isolation valves
C. Reducing flow friction
D. Stop valves
E. Remote controlling

Answer 7

A. Throttling valves

Question 8

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. 100 kPa (14.5 psi)
D. 50 kPa (7.3 psi)
E. 28 kPa (4 psi)

Answer 8

E. 28 kPa (4 psi)

Question 9

Butterfly valves use a flat disc that can be rotated through ______ from the fully open to the fully closed position.

Select one:

A. 45°
B. 180°
C. 60°
D. 90°
E. 30°

Answer 9

D. 90°

Question 10

All valves not properly or clearly identified should be:

Select one:

A. Used as they are available
B. Kept for emergency use
C. Sold for scrap
D. Rejected
E. Used in non critical areas

Answer 10

D. Rejected

Question 11

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 bonnet connection
E. Tightening the hand wheel down

Answer 11

C. Slightly tightening the packing nut or gland

Question 12

The maximum operating temperature for a butterfly valve is _____ .

Select one:

A. 500°C (932°F)
B. 1500°C (2730°F)
C. 1100°C (2012°F)
D. 1200°C (2190°F)
E. 1000°C (1832°F)

Answer 12

C. 1100°C (2012°F)

Question 13

The valve gland contains the:

Select one:

A. Wheel
B. Bonnet
C. Body
D. Disc
E. Packing

Answer 13

E. Packing

Question 14

On a steam system the non-return drip valve is connected to the:

Select one:

A. Steam boiler outlet
B. Continuous blowdown outlet
C. Feed water inlet
D. Blowdown valve outlet
E. Safety valve outlet

Answer 14

A. Steam boiler outlet

Question 15

Another version of the globe valve is the ____ valve.

Select one:

A. Plug
B. Needle
C. Gate
D. Ball
E. Butterfly

Answer 15

B. Needle

Question 16

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

Select one:

A. Material designation
B. Mass of the valve
C. Type of packing used
D. Type of valve
E. Size of the valve

Answer 16

A. Material designation

Question 17

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

Select one:

A. Service designation
B. Type of valve
C. Mass of the valve
D. Type of packing used
E. Size of the valve

Answer 17

A. Service designation

Question 18

A valve bonnet leak is from the connection between the:

Select one:

A. Stem and the disc
B. Stem and the gland
C. Bonnet and the body
D. Bonnet and the gland
E. Bonnet and the disc

Answer 18

C. Bonnet and the body

Question 19

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

Select one:

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

Answer 19

D. Manufacturers name or trademark

Question 20

The actuator may be _____ operated.

Select one:

A. Electrically
B. Hydraulically
C. Pneumatically
D. None of the above
E. All of the above

Answer 20

E. All of the above