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Lvl. 4 Gas - Exam #2 > Pressure Regulator Quiz > Flashcards

Pressure Regulator Quiz Flashcards

1
Q

What is the measuring element of a regulator?

Spring
Valve disc
Diaphragm
Atmospheric vent

A

c

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2
Q

What is the restricting element of a regulator?

Spring
Valve disc
Diaphragm
Atmospheric vent

A

b

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3
Q

What is the loading element of a regulator?

Spring
Valve disc
Diaphragm
Atmospheric vent

A

a

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4
Q

What would cause an appliance regulator to have too low of an outlet pressure?

Vent port plugged
Ruptured diaphragm
Sensing hole blocked
Inlet pressure too low

A

d

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5
Q

The purpose of a gas pressure regulator is:

To keep the colour of the flame constant
To maintain even outlet heated air temperatures
To maintain a constant gas pressure at the gas valve inlet
To increase and maintain higher pressures as the load increases

A

c

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6
Q

In a gas pressure regulator, the closing force is created by:
Decreased flow velocity
The inlet pressure to the regulator
The pressure under the diaphragm
The adjustable spring above the diaphragm

A

c

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7
Q

In a gas pressure regulator, the opening force is created by

Increased flow velocity
The inlet pressure to the regulator
The pressure under the diaphragm
The adjustable spring above the diaphragm

A

d

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8
Q

To increase downstream pressure of the regulator

The orifice size is changed
The adjusting screw is screwed out
The adjusting screw is screwed down
Replace the restricting disc and the spring

A

c

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9
Q

What is the purpose of the atmospheric vent?

Allow gas to escape
Sense downstream pressure
Allow air above diaphragm to escape or enter
Allow a connection for a secondary pilot

A

c

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10
Q

A pressure regulator is said to be in equilibrium when the:

Opening force of the diaphragm is equal to the closing force of the orifice
Opening force of the diaphragm is equal to the closing force of the spring
Opening force of the spring is equal to the closing force of the upstream pressure
Opening force of the spring is equal to the closing force of the downstream pressure

A

d

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11
Q

What term describes the condition when the outlet pressure is lower than set point pressure during flow conditions?

Rise
Boost
Droop
Lockup

A

c

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12
Q

If a regulator is installed backwards in a piping system, what is the most likely result?

The regulator will open completely
The regulator will close completely
Pressure downstream will rise above set point
No difference – they are non-directional valves

A

b

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13
Q

The purpose of a pitot tube in a regulator is to:

Provide mechanical advantage for positive shut-off
Relieve unwanted gases when overpressure occurs
Increase upstream pressure during static conditions
Keep downstream pressure closer to set point during flow conditions

A

d

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14
Q

The purpose of a pitot tube in a regulator is to:

Provide mechanical advantage for positive shut-off
Relieve unwanted gases when overpressure occurs
Increase upstream pressure during static conditions
Keep downstream pressure closer to set point during flow conditions

A

d

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15
Q

When flow rate increases through a regulator, what happens to the downstream pressure?

It increases
It decreases
It cycles/hunts
It stays the same

A

b

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16
Q

Which category of gas pressure regulators are used to reduce the service line pressure to building line pressure at the gas meter set?

Service regulators
Appliance regulators
First-stage regulators
Line pressure regulators

A

a

17
Q

An undersized vent pipe on a regulator may cause the:

Pilot safety to fail
Restricting element to stay fully open
Restricting element to say fully closed
Regulator to go respond slow or sluggish

A

d

18
Q

A pressure regulator shall _______________________

Be bypassed
Have a leak-limiting orifice
Be of a positive shut-off type
Have a valve located immediately downstream

A

c

19
Q

What is the purpose of a reference tube connected to the combination gas valve regulator vent?

Supply the pilot gas flow
Activate the combustion fan pressure switch
Vent the upper diaphragm chamber into the combustion chamber
Enable the regulator to automatically adjust for pressure changes in the burner enclosure

A

d

20
Q

What is “lockup pressure”?

The pressure downstream of a regulator under no flow conditions
The pressure downstream of a regulator under full flow conditions
The pressure downstream of a regulator during full relief conditions
The pressure downstream of a regulator which activates the internal relief valve

A

a

21
Q

Where is the hydrostatic relief valve used?

Propane gas systems
Liquid propane systems
High pressure natural gas
Natural gas service meter sets

A

b

22
Q

What is the maximum allowed propane pressure in a single-family dwelling?

7 inches w.c.
14 inches w.c.
2 psig
5 psig

A

c

23
Q

A zero governor is designed to deliver gas at zero pressure in proportion to the suction pressure created by mechanical air flow to a premix burner.

True
False

A

true

24
Q

What type of regulator arrangement is required in all permanent propane installations?

Two stage regulation
Proportioning regulation
Zero governor regulation
Balance diagram regulation

A

a

25
Q

Gas flow will be interrupted by changing a propane cylinder if an automatic changeover regulator is used on the installation.

True
False

A

false

26
Q

An air/gas proportioning regulator delivers gas under pressure in proportion to the pressure created by mechanical air flow to a nozzle mix burner.

True
False

A

true

27
Q

What units are usually used to express the rate of flow for a regulator?

SCFH
BTUH
MBH
KWH

A

c

28
Q

You are selecting the line pressure regulator for a 2 psig natural gas system which had the pipe sized for the maximum allowable pressure drop.
What operating inlet pressure would you use for the regulator capacity tables?

0.5 psi
1 psi
1.5 psi
2 psi

A

a

29
Q

The arrow on a regulator body should point upstream.

True
False

A

false

30
Q

When sizing a propane regulator system what determines the lowest expected vapour inlet pressure?

Pipe size
Cylinder size
Regulator orifice size
Cylinder outside temperature

A

d

31
Q

Propane systems have a ______ orifice than natural gas

A

smaller

Lvl. 4 Gas - Exam #2 (9 decks)

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