Esco Electrical/ESCO A-C/Esco Heat pump/hvacr gas heating Exam Bundle

An instrument that measures potential differences between 2 points in an electrical circuit is called? A. potentiometer B. thermistor C. ohmeter D. voltmeter - ans-voltmeter This device uses a thermal sensing bulb at the outlet of the evaporator to sense temperature and control superhea...

What is an SSU and what does it do? - ans-It is a unit located on the side of the first which receives power (120 volts) before anything located within the furnace itself. It primarily consists of a switch and a fuse, and it is what allows for power to flow to the door switch. Opening the switc...

What is current flow? - ans-D.The flow of electrons in a circuit What is impedance? - ans-A.Opposition to alternating current Like charges will - ans-B.Repel each other Any material that will readily release electrons is called: - ans-B.A conductor The symbol for curr...

1. Heat which causes a change in temperature of a substance is called; A. latent heat B. sensible heat C. superheat D. radiant heat - ans-B. sensible heat 2. Heat added to a substance without a raise in temperature; (example: liquid refrigerant to gas) this process is called? A. latent ...

A technician has found an air conditioning system with a leak in the liquid line. After the line is repaired, the system is evacuated and properly retired. When the system is started, the compressor is noisy and running hot. The most probable cause of the noise is.... - ans-Lower oil in the sys...

Heat which causes a change in temperature of a substance is called; - ans-sensible heat. Heat which causes a change in state of a material without a change in temperature is called; - ans-latent heat. Heat which is added to a vapor after the change of state occurs is called; - ans-...

Heat which causes a change in temperature of a substance is called - ans-Sensible heat Heat added to a substance without a rise in temperature - ans-Latent heat Heat added to the refrigerant in a vapor state after the evaporation process is called - ans-Superheat Scroll compress...

An air-to-air heat pump has many of the same components as an air conditioning system. The major difference is that a heat pump also has an - ans-Reversing valve What is the difference between "demand defrost" and "timed defrost"? - ans-Demand defrost happens only when needed and timed ...

Heat which causes a change in temperature of a substance is called; - ans-Sensible Heat. heat added to substance without a rise in temperature; (example: liquid refrigerant to gas) this process is called? - ans-Latent heat of vaporization. Heat added to the refrigerant in a vapor state...

1. A gas furnace is to be installed in a garage. The burners and ignition sources must be located ______ above the floor. A: 6 inches B: 12 inches C: 18 inches D: 24 inches - ans-C: 18 inches 2. A good description of how hi-metai fan switch operates the blower motor on a gas furnace is: A...

Before working on an electric furnace the tech should - ans-Review diagram, remove jewelry, and follow safety procedures. ALL OF THE ABOVE. A GFCI circuit breaker - ans-detects current leaks to groound the conductor in an electric heat element is usually made of - ans-Nichrome A...

A gas furnace is to be installed in a garage. The national standards require that the burners and ignition sources must be located ______ above the floor - ans-18 inches A good description of how a bi-metal fan switch operates the blower motor on a gas furnace is - ans-Temperature on- tempe...

using an ohmmeter, there is 120 VAC between high speed and ground wires, this indicates - ans-open if temperature rise is too high... - ans-increase fan speed how many of the 3 OSHA conditions defining confined spaces must be met - ans-all 3 what causes the temperature limit safety...

A room contains two fuel burning appliances. The total btu input of both appliances is 125,000 BTU's. How many cubic feet are required for the room NOT to be considered confined space? - ans-125,000/1000 = +50 6250 What is the maximum length of the flexible gas connector going to a furnace? -...