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Janya
Joined: 14 Nov 2006
Posts: 1
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 Posted: Tue Nov 14, 2006 4:55 pm Post subject: Heating Ventillation Air Conditioning forum |
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I need help with this questionaire can somebody help me with this...i need to choose the right choices i need to verify with experts like you.
1.What's the best way to change the sensible heat level of the evaporator?
a.Change the airflow rate
B.change th size of the evaporator
c.use a diff refrigerant.
d.use a different style evaporator
2.how many pounds of air would a fan having a capcity of 1500cfm move in 12 hrs
a.13,483,
b.80899
c.53933
d.161798
3.what's the relative humidity of a room having a dry-buld temperature of 72 degree F and a wet-bulb temp of 59 degree F?
a.43%
b.48%
c.46%
d.53%
4.Individual sections of round sheet metal duct should be held together with
a. min of 3 screws
b.4 screws
c.mastic and sealing tape
d.pop rivets
3.An effective way to lower the head pressure of a compressor is to use a
a.Larger condenser
b.smaller condensor
c.larger evaporator
d.sma;;er evaporator
6. During rotine maintenance a technician discovers that the discharge pressure is higher when, at the same time, the current draw of the fan motor is lower than the system's specifications call for. Waht should the technician check for?
a.blocked air inlet
b,blocked air outlet
c.dirty return air filter
d dirty condenser
7.what's the sensible heat(buth) of a system that delivers 2000 cfm with a temperature differential of 55 degree.F
a.110000
b.118800
c.145000
d.198000
8.How much condensate could a 7 ton air-conditioning system(in avg humidity) generate in 12hrs of operation?
A. 504
b. 432
c, 252
d. 36
9.how many square feet or foor space does a house have if it has 96 inch-high ceilings and 32,000 ft3 volume
a. 3000
b,3750
c4000
d 4500
10.the type of compressor that is typically used in residential and light commerical applications is the
a. reciprocating compressor
b rotary compressor
c scroll compressor
d.screw compressor
11.what's the airflow velocity within a branch duct if the flow rate is 175 cfm and the duct is 12 inches high by 18 inches wide?
A.90 fpm
b. 112 fpm
c.117fpm
d.165
12.Two technicians are discussing the design of a new all-weather duct system. Technician A says that the ductwork needs to be designed so that it doesn't require any insulation. Technician B says the ductwork needs to be designed around the cooling system. Which of the following statements is correct
13.Which is a geothermal heat pump classification?
a. Air loop
b,closed loop
c,ground loop
d. water loop
14 An airflow rate of 800cfm be typical for a/an -------air conditioning system
a.1 ton
b.2 ton
c.4ton
d.8ton
15 which of the following components is found only on a heat pump?
a.compressor
b.evaporator
c.four-way valve
d metering device
16,Two technicians are discussing geothermal heat pumps. Technician A says that a water source heat pump has the water flowing through the heat exchanger in one direction and the refrigerant flowing through it in the opposite direction. Technician B says that geothermal heat pumps aren't counter-flowing devices. which of the following statements is correct?
A. Technician A is correct
b. technician B is correct
c. both are correct
d. neither tech is correct
17.how much usable heat is available in ambient air that is 0 degree F
a.85%
b.42%
c.15%
d.no usable heat is available
18. which instrument would you use to determine the phase of a transformer
A. ammeter
b, milliammeter
c.ohmmeter
d. voltmeter
19.a heat pump has a COP rating of 2.5 to 1. If 200 watts of electricity are used to run the heat pump, how many equivalent watts(heat) are produced?
a.200 watts
b. 400 watts
c.500 watts
d.750 watts
20.Which is the best antifreeze solution to use in a geothermal heat pump?
a.Acetone
b.Glycol
c.Polybutylene
d.polythylene |
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