The role of an Electrical Thermostat is to:

regulate temperature by switching heating or cooling devices on or off.

measure humidity levels in the environment.

control the speed of an electric fan.

monitor the energy consumption of appliances.

What does a Regulator do in ?

Monitors and controls system processes

Provides user interface customization

What does the bi-metallic strip rely on to close the gas supply to a burner?

Differential expansion of dissimilar metals

The bi-metallic strip functions when the pilot is extinguished by:

bending due to different expansion rates of metals

melting and breaking the circuit

conducting electricity to reignite the pilot

What is one advantage of a Bi-metallic Strip?

Minimum number of 'working' parts

What is one disadvantage of a Bi-metallic Strip?

Minimum number of 'working' parts

What is the function of the Mercury Vapour Device as shown in the image?

It acts as a flame supervision device.

It is a temperature control device.

The sensor is heated by the first stage flame causing the mercury vapour inside the probe to expand. This rapid increase in _______ pressure is used to open a small gas valve, allowing the burner rate to _______.

The sensor is heated by the first stage flame causing the mercury vapour inside the probe to expand. This rapid increase in pressure is used to open a small gas valve, allowing the burner rate to increase.

The sensor is heated by the first stage flame causing the mercury vapour inside the probe to expand. This rapid increase in temperature is used to open a small gas valve, allowing the burner rate to decrease.

The sensor is heated by the first stage flame causing the mercury vapour inside the probe to expand. This rapid increase in volume is used to open a small gas valve, allowing the burner rate to stabilize.

The sensor is heated by the first stage flame causing the mercury vapour inside the probe to expand. This rapid increase in density is used to open a small gas valve, allowing the burner rate to fluctuate.

Explain the sequence of operation of a Mercury Vapour Device as described in the passage.

The device starts with the ignition of the mercury vapor, followed by the stabilization of the arc, and finally the emission of light.

The device begins with the emission of light, followed by the ignition of the mercury vapor, and finally the stabilization of the arc.

The device starts with the stabilization of the arc, followed by the emission of light, and finally the ignition of the mercury vapor.

The device begins with the emission of light, followed by the stabilization of the arc, and finally the ignition of the mercury vapor.

Explain how the Mercury Vapour Device works based on the given description: The mercury in the phial is heated and has vaporised. If for any reason the main flame fails, the mercury condenses and contracts, closing the main valve. Returning the burner to by-pass rate. N.B. It does not shut down the gas completely!

The mercury condenses and contracts, closing the main valve and returning the burner to by-pass rate.

The mercury expands and opens the main valve, increasing the burner rate.

The mercury remains vaporized, keeping the main valve open.

The mercury solidifies, shutting down the gas completely.

What happens when the probe of a Mercury Vapour Device is cold?

There is a small gap between the diaphragm and the operating lever.

The diaphragm and operating lever are tightly closed.

The gas valve opens immediately.

What is one of the advantages of the Mercury Vapour Device?

Any damage to sensor or capillary tube will cause the valve to fail

What should be done if there is incorrect siting of the probe in relation to the first stage flame?

Reposition probe & secure in place with clip.

Ignore the issue and continue operation.

Replace the probe with a new one.

Consult the user manual for troubleshooting.

What is the remedy if the lever system and valve may not operate smoothly?

Clean and lubricate, check seals.

What should be checked if the burner fails to run on low rate (first stage flame)?

Check thermostat by-pass is not blocked.

Inspect the ignition system for faults.

Ensure the air filter is clean.

A typical Vitiation Sensing Device (V.S.D.) operates to heat a thermocouple by:

utilizing electrical resistance heating

using a chemical reaction to generate heat

absorbing ambient heat from the environment

What is the primary function of a Mercury Vapour Device in a heating system?

To regulate the burner rate by condensing and contracting mercury.

To increase the pressure in the gas line.

To provide light in the heating system.

To completely shut down the gas supply in case of a flame failure.

What is a potential consequence of a malfunctioning pilot flame in a Mercury Vapour Device?

The mercury will condense, causing the main valve to close.

The mercury will remain vaporized, keeping the main valve open.

The main burner will ignite automatically.

The device will shut down completely.

Gas Control Revision Lesson

Authored by Ky Marland

Construction

Professional Development

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A Bi-metallic Strip is used for ______ .

measuring temperature

controlling electrical circuits

detecting motion

measuring pressure

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The function of a Mercury Vapour Device

To measure temperature

To control humidity

To detect gas leaks

To monitor air quality

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Explain the role of a Vitiated Pilot (ASD) .

A Vitiated Pilot (ASD) monitors the system for anomalies.

A Vitiated Pilot (ASD) is responsible for system maintenance.

A Vitiated Pilot (ASD) manages user access controls.

A Vitiated Pilot (ASD) oversees data encryption processes.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A Gas relay is used to:

Monitor gas levels

Control gas flow

Detect gas leaks

Regulate gas pressure

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The purpose of a Safety Shut-off is to:

prevent unauthorized access

ensure operational safety

monitor system performance

enhance user experience

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A Multi-functional Valve is used for:

regulating flow and pressure

monitoring temperature

controlling electrical circuits

measuring humidity

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A Mechanical Thermostat functions by ?

regulating temperature through a bimetallic strip that expands and contracts with temperature changes.

using a digital sensor to measure and adjust the temperature.

employing a mercury switch to control the heating system.

utilizing a wireless connection to communicate with a central system.

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Gas Control Revision Lesson

A Bi-metallic Strip is used for ______ .

The function of a Mercury Vapour Device

Explain the role of a Vitiated Pilot (ASD) .

A Gas relay is used to:

The purpose of a Safety Shut-off is to:

A Multi-functional Valve is used for:

A Mechanical Thermostat functions by ?

The role of an Electrical Thermostat is to:

What does a Regulator do in ?

The function of a Thermo-electric FFD is to:

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