Question 1

You can consult the NEC for insulation temperature ratings.

Accepted Answer

The National Electrical Code (NEC) provides guidelines and standards for electrical installations, including temperature ratings for insulation materials. Therefore, you can consult the NEC for information on insulation temperature ratings. The NEC (National Electrical Code) provides information on insulation temperature ratings, so it is true that you can consult the NEC for this information.

Question 2

A flow switch used with may start a motor when flow occurs, and stop the motor when there is no flow.&#10;A)on-off circuit&#10;B)short circuit&#10;C)three-phase circuit&#10;D)single-phase circuit

Accepted Answer

C

Question 3

A flow switch may be used to detect over the refrigeration coils, stopping the refrigeration compressor and starting a defrost cycle.&#10;A)insufficient air movement&#10;B)insufficient refrigerant&#10;C)excessive air movement&#10;D)excessive refrigerant

Accepted Answer

A flow switch is used to detect insufficient air movement over the refrigeration coils, which can lead to ice buildup and obstructed air flow. When the switch detects low air flow, it signals the system to stop the refrigeration compressor and start a defrost cycle to melt the ice and clear the coils. A flow switch is used to detect insufficient air movement over the refrigeration coils, which can cause ice buildup and decrease the efficiency of the refrigeration system. Once detected, the flow switch can signal to stop the refrigeration compressor and start a defrost cycle to remove the ice buildup. Excessive air movement or refrigerant would not require a defrost cycle and would not be detected by a flow switch.

Question 4

Air condition and heating circuits often use timed contacts that are self-contained and do not require a coil for operation. Their time delay is preset and cannot be adjusted.

Accepted Answer

Timed contacts in air condition and heating circuits are often self-contained and preset for a specific time delay, requiring no coil for operation and cannot be adjusted. Timed contacts used in air conditioning and heating circuits are often self-contained and have a preset time delay that cannot be adjusted. They do not require a coil for operation.

Question 5

In general, a flow switch contains electrical contacts.&#10;A)either normally open or normally closed&#10;B)only normally open&#10;C)both normally open and normally closed&#10;D)only normally closed

Accepted Answer

A flow switch can have both normally open and normally closed electrical contacts, depending on the specific design and application. This allows for greater flexibility in how the switch can be used and connected to a control system. Flow switches can have both normally open and normally closed electrical contacts, depending on the design and application. Normally open contacts are used to open or interrupt a circuit when flow is detected, while normally closed contacts are used to close or complete a circuit when flow is detected. Having both options allows for greater flexibility in incorporating the flow switch into different control schemes.

Question 6

The electrical connections of airflow switches are those of liquid flow switches.&#10;A)very different from&#10;B)similar to&#10;C)derived from&#10;D)identical to

Accepted Answer

The electrical connections of airflow switches are similar to those of liquid flow switches. Both types of switches use a mechanical mechanism to activate a switch when flow is detected, and the switch typically has two electrical connections for the detection circuit. Therefore, the electrical connections are similar between the two types of switches. The electrical connections of airflow switches are similar to those of liquid flow switches.

Question 7

Typical applications of flow switches are commonly found in the chemical and petroleum industries.

Accepted Answer

Flow switches are commonly used in the chemical and petroleum industries to monitor the flow of fluids in pipes and tanks. They can also be used in HVAC systems, water treatment plants, and various manufacturing processes. Flow switches are commonly used in the chemical and petroleum industries to monitor the flow of liquids or gases in pipelines, tanks, and other equipment. They are also used in many other industries such as food and beverage, water treatment, and HVAC systems.

Question 8

A flow switch either closes or opens a set of gates.

Accepted Answer

A flow switch is a device that is activated by the flow of fluid in a pipe. It does not control gates, but rather is used as a safety device to monitor the flow rate of fluids in pipes and trigger an alarm or shutdown if the flow rate falls outside of predetermined limits. A flow switch is a device that monitors the flow of a liquid or gas and sends a signal to a control system to either turn on or off a specific process. It does not typically control any gates directly.

Question 9

A flow switch is a device that can be inserted in a pipe so that when liquid or air flows against a part of the device called a , a switch is activated.&#10;A)pilot tube&#10;B)Bourdon tube&#10;C)bulb&#10;D)paddle

Accepted Answer

A paddle is a component of a flow switch that is designed to move or rotate when flowing liquid or air hits it. This movement triggers a switch that can be used for various applications such as controlling the flow of liquid or shutting down a system in case of a blockage. Neither A) pilot tube, B) Bourdon tube, nor C) bulb are typically used in flow switches. A flow switch typically contains a paddle or vane that is displaced when there is a flow of liquid or air. This displacement activates a switch or other mechanism to signal flow or no flow.

Question 10

The insulation of the wire leading to the switches must be adequate to withstand the high pressure of the liquid inside the pipe.

Accepted Answer

The pressure inside the pipe is not a concern for the insulation of the wire leading to the switches. The insulation should be adequate to prevent electrical hazards and ensure proper functioning of the switches. The statement is incorrect because the pressure inside the pipe has nothing to do with the insulation of the wire. The insulation of the wire must be adequate to withstand the electrical current passing through it.

Deck 12: Flow Switches