Nocti Hvac Study Guide with Complete Solutions | Latest Update | Already Passed
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Course
Hvac
Institution
Hvac
Nocti Hvac Study Guide with Complete
Solutions | Latest Update | Already
Passed
An Hvac system that depends on the temperatures below the ground
surface as an operation factor is a .. - Geothermal heat pump
when putting out a fire involving oily rags use a ________ fire extinguisher?
- Class ...
Which of the following measurements would be needed to determine oil
furnace combustion efficiency?
a. net stack temperature and CO2 concentration
b. net stack temperature and CO concentration
c. stack temperature and indoor temperature
d. stack temperature and fuel pressure - ✔✔a. net stack temperature and
CO2 concentration
When combustion is being tested on an oil furnace, high level of smoke
and can be corrected by:
a. Adjusting the barometric damper.
b. Opening the air shutter.
c. Adjusting the primary control.
d. Closing the air shutter. - ✔✔b. Opening the air shutter
,A common problem with restaurant units is their location near kitchen
exhaust. This could cause high discharge pressure in the cooling mode
because:
a. Return air filter becomes plugged.
b. Grease plugs the evaporator.
c. Grease plugs the condensate line.
d. Grease plugs the condenser coil. - ✔✔d. Grease plugs the condenser
coil.
When a heat pump is in the cooling mode of operation, the check valve at
the indoor coil should be:
a. Modulating.
b. Half open.
c. Fully closed.
d. Fully open. - ✔✔c. Fully closed.
The technician make a service call in answer to a complaint of little or no
cooling from an R-22 rooftop air conditioning unit. Upon checking pressures
when the unit is running, the technician finds:
· Suction pressure 48 psig
,· Discharge pressure 190 psig
· Superheat 0°F
The problem most likely occurs because the:
a. Evaporator coil is iced up.
b. Unit is full of non-condensables.
c. Dirty condenser coil.
d. Unit is overcharged. - ✔✔a. Evaporator coil is iced up.
The result of properly converting a natural gas furnace to LP using the
factory kit will:
a. Decrease the pressure and the orifice size
b. Decrease the pressure and increase the orifice size
c. increase the pressure and the orifice size
d. increase the pressure and decrease the orifice size - ✔✔d. increase the
pressure and decrease the orifice size
At least 24 hours before you start up a system that has been shut down for
a long time, you must energize the crankcase heater, in order to:
a. reduce the viscosity of the oil
, b. reduce the amount of refrigerant that may be in the compressor
c. warm the compressor so that it will work more efficiently
d. heat the refrigerant so that it will work more efficiently - ✔✔b. reduce the
amount of refrigerant that may be in the compressor
In checking a restaurant, a technician find difficulty in opening the front
doors. Providing that kitchen exhaust and make-up air are balanced
properly, which of the following adjustments should be made?
a. the blower speed should be decreased
b. System BTU capacity should be increased
c. The space temperature set point should be increased
d. The minimum outdoor air setting should be checked - ✔✔d. The
minimum outdoor air setting should be checked
A furnace is rated at 120,000 Btu input, but produces 100,000 Btu output.
The percentage that exists as lost heat is:
a. 12%
b. 17%
c. 22%
d. 20% - ✔✔b. 17%
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