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Book 1 PanGlobal Assessment Test Unit One: Boiler Details (5th Class Power Engr) > Chapter 18 Introduction to Valves > Flashcards

Chapter 18 Introduction to Valves Flashcards

1
Q

1.All valves not properly or clearly identified should be:

A. Used in non critical areas

B. Kept for emergency use

C. Rejected

D. Used as they are available

E. Sold for scrap

A

C. Rejected

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2
Q
  1. On a steam system the non-return stop valve is connected to the:

A. Feedwater inlet

B. Steam boiler outlet

C. Blowdown outlet

D. Safety valve outlet

E. Continuous blowdown outlet

A

B. Steam boiler outlet

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3
Q
  1. Valve stem leaks can normally be fixed by:

A. Tightening the hand wheel down

B. Slightly backing off the hand wheel

C. Tightening the bonnet connection

D. Slightly tightening the packing nut or gland

E. Tightening the hand wheel nut

A

D. Slightly tightening the packing nut or gland

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4
Q
  1. Which of the following application is a plug valve not suitable for?

A. Water treatment plants

B. High pressure steam lines

C. Chemical industries

D. Gas supply lines

E. Pulp and paper industries

A

B. High pressure steam lines

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5
Q
  1. All valves must be properly identified with one of the markings indicating the:

A. Mass of the valve

B. Material designation

C. Size of the valve

D. Type of packing used

E. Type of valve

A

B. Material designation

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6
Q
  1. Valve packing surrounds the:

A. Disc

B. Packing gland

C. Bonnet

D. Body

E. Stem

A

E. Stem

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7
Q
  1. The maximum operating temperature for a butterfly valve is _____.

A. 500°C (932°F)

B. 1200°C (2190°F)

C. 1100°C (2012°F)

D. 1500°C (2730°F)

E. 1000°C (1832°F

A

C. 1100°C (2012°F)

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8
Q
  1. The valve stem connects the:

A. Wheel to the bonnet

B. Yoke to the wheel

C. Disc to the yoke

D. Wheel to the disc

E. Bonnet to the bod

A

C. Disc to the ‘‘yoke’’

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9
Q
  1. On a hot water heating system the stop/balance check valve is also known as a _____ valve.

A. Non-return

B. Pressure balancing

C. Triple duty

D. Double duty

E. Temperature control

A

C. Triple duty

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10
Q
  1. The basic type of ball valve requires _____ from the fully open to the fully closed position.

A. One turn

B. One half turn

C. One quarter turn

D. Two turns

E. Five turns

A

C. One quarter turn

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11
Q
  1. Globe valves are ideal for:

A. Isolation valves

B. Reducing flow friction

C. Remote controlling

D. Stop valves

E. Throttling valves

A

E. Throttling valves

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12
Q
  1. The valve gland contains the:

A. Packing

B. Disc

C. Bonnet

D. Body

E. Wheel

A

A. Packing

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13
Q
  1. The non-return stop valve is also referred to as a _____ valve.

A. Stop and check

B. Stop and gate

C. Gate and check

D. Ball and stop

E. Globe and stop

A

A. Stop and check

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14
Q
  1. All valves must be properly identified with one of the markings indicating the:

A. Service designation

B. Mass of the valve

C. Size of the valve

D. Type of packing used

E. Type of valve

A

A. Service designation

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15
Q
  1. Another version of the globe valve is the _____ valve.

A. Needle

B. Ball

C. Butterfly

D. Plug

E. Gate

A

A. Needle

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16
Q
  1. All valves must be properly identified with one of the markings indicating the:

A. Type of valve

B. Mass of the valve

C. Size of the valve

D. Type of packing used

E. Manufacturer’s name or trademark

A

E. Manufacturer’s name or trademark

17
Q
  1. The plug valve consists of a _____ containing a hole that is inserted into the cavity of the valve body.

A. Ball

B. Disc

C. Dashpot

D. Tapered or straight cylinder

E. Diaphragm

A

D. Tapered or straight cylinder

18
Q
  1. A valve bonnet leak is from the connection between the:

A. Bonnet and the gland

B. Stem and the gland

C. Bonnet and the disc

D. Stem and the disc

E. Bonnet and the body

A

E. Bonnet and the body

19
Q
  1. On a steam system the non-return stop valve is connected to the:

A. Feedwater inlet

B. Steam boiler outlet

C. Blowdown outlet

D. Safety valve outlet

E. Continuous blowdown outlet

A

B. Steam boiler outlet

20
Q
  1. The check valve is a valve which prevents _____ in piping.

A. High pressure

B. Low pressure

C. High flow

D. Low flow

E. Reversal of flow

A

E. Reversal of flow

21
Q
  1. Gate valves consist of a gate-like disc, actuated by a screwed stem and hand wheel that moves _____ the path of flow.

A. Up and down parallel to

B. Up and down at right angles to

C. Clockwise with

D. Counterclockwise with

E. Perpendicular with

A

B. Up and down at right angles to

22
Q
  1. The ‘‘valve stem connects’’ the:

A. Wheel to the bonnet

B. Yoke to the wheel

C. Disc to the yoke

D. Wheel to the disc

E. Bonnet to the bod

A

D. Wheel to the disc

Book 1 PanGlobal Assessment Test Unit One: Boiler Details (5th Class Power Engr) (24 decks)

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