Which instrument measures pressure above or below atmospheric pressure?

• compound gauge
• pressure gauge
• barometer
• psychrometer

Assume that a gas-fired appliance is located in a garage. Burners of such appliance must be at a distance above the garage floor AT LEAST ____.

• There is no minimum clearance
• 18 inches
• 12 inches
• 6 inches

According to Ohm's Law, the correct units for electrical current are

• Ohms.
• Watts.
• Volts.
• Amperes.

Where should the air conditioning system thermostat be located?

• near a door or window
• near an air duct
• where there is a wide range in temperature
• where average temperature conditions exist

How can the head pressure in an air-cooled condenser be determined?

• by taking the operational pressure
• by subtracting the condenser temperature from the room temperature
• by subtracting 25 degrees F (13 degrees C) from the present condenser temperature
• by adding 30 degrees to 35 degrees F (17 degrees C to 19 degrees C) to the desired condenser temperature

What pressure is R-134a at 40 degrees F?

• 30 psig
• 35 psig
• 40 psig
• 45 psig

Locking refrigerant service access ports are REQUIRED on

• class B refrigerants
• class A3 refrigerants
• all access ports
• only ports located outdoors

Industrial air heaters: the installation shall include adequate provision to permit direct-fired industrial air heater to operate at rated capacity by taking into account the structure's designed infiltration rate, providing properly designed ____ or an interlocked power exhaust system.

• relief air openings
• make-up water
• refrigerant piping
• ductwork

Heat of fusion of water, is the heat released from a substance to change irt from a liquid state to a solid state. The heat of fusion of ice is ___ Btu per pound.

• 144
• 109
• 42
• 31

The operating temperature for grease hood fire dampers shall NOT be more than ___ where located in a smoke control system.

• 310 degrees F
• 212 degrees F
• 350 degrees F
• 286 degrees F