Exam Bruhh

Question 1

Parrallel Series receive all bolts of pressure.

Answer 1

In series bulb does not get all 240 volts.

Question 2

Bimetal devices

Answer 2

Snap disk

Question 3

Bourdon tube

Answer 3

This tube is often used in the same manner as the diaphragm and the bellows to monitor fluid expansion

Question 4

Detent means

Answer 4

Snap action

Question 5

Thermacouple

Answer 5

Does not use expansion to control thermal change and study uses electrical principlesAlso consist of two unlike metals joining together at one end

Question 6

Thermistors

Answer 6

Vary their resistance Two current flow based on its temperature thermistors are incorporated into solid state circuit boards and respond to small temperature changes

Question 7

Thermopiles

Answer 7

Multiple thermistors can be wired in series with each other to provide a higher output voltage and one configure like this are called thermopiles

Question 8

Heat anticipator- is a small resister which is usually an adjustable located close to the bimetal sensing element. Is in series

Answer 8

A cold anticipator is a fixed resistor in a space coin thermostat used to start an air-conditioning system prematurely

Question 9

The heating thermostat opens on a rise in temperature

Answer 9

Detent is a snap action.

Question 10

An example of an electro mechanical control is a high pressure switch

Answer 10

An

Example of a mechanical control is a water pressure regulating valve

Question 11

Cooling thermostats may have a cold calling anticipator in parallel with the thermostat contacts

Answer 11

Low voltage thermostat passes power from the transformer to the Loads in the control circuit

Question 12

High pressure transducer is a device that senses the pressure in the system and then converts the sensed pressure signal to an electronic signal usually to be processed by microprocessor

Answer 12

Motor protection- Bimetal and thermistor.

Question 13

Suction gas cools hermetic compressor

Answer 13

Some electromechanical controls are low pressure cut out, high-pressure cut out, and thermostats.

Question 14

Examples of mechanical controls Are water regulating valve, pressure relief valve, and expansion valves.

Answer 14

Solid state boards allow for resistance to change with temperature

Question 15

Low-pressure high-pressure is not a mechanical control

Answer 15

Differential equals average box temperature

Question 16

Cool anticipator replace with new thermostat

Answer 16

Typical Pressure to gas furnace 3.5

Question 17

Water cooled system valve is acting against system head pressure feeds into a water regulator on condensing side.

Answer 17

Bimetal temp Control brass and steel

Question 18

Differential settings cut in and cut out

Answer 18

Automatic control system- Maintain controllable conditions.

Question 19

Controllable devices- Compressor gas regulator

Answer 19

Two loads on energy side fan motor and light two speeds

Question 20

F equals single pole double throw

Answer 20

FH equals time on time off

Question 21

SD = Service disconnect manual, (c) contact coil turns on compressor. LS - opens when The furnace is too hot

Answer 21

Cool off heat system switch

Question 22

Heating opens on rise, cooling closes on rise

Answer 22

Auto on= Fan Switch

Question 23

GU has one limit switch

Answer 23

Tc and Tt are switches, Time on temperature up. This schematic is for heating and cooling

Question 24

No compressor= no outdoor fan motor

Answer 24

Anticipator’s for cooling are in parallel, while the heat anticipator is in series

Question 25

Calculating capacitance and resistance

Answer 25

Sail switch- an air switch insured that the blower is passing air through the duct.

Question 26

Net oil pressure Is the difference in the suction pressure and the oil pump outlet pressure

Answer 26

Volts equals electrical force or pressure(V)
Ampere=Quantity of electron flow rate (A)
Ohm= resistance to electron flow