1- In a system with outdoor air for ventilation:
(a) the load on coil is equal to the load on building
(b) the load on building is greater than the load on coil
(c) the load on building is less than the load on coil
(d) the Coil ADP is less than room ADP.
2- Evaporative cooling systems are:
(a) attractive for hot and humid climates
(b) attractive for hot and dry climates
(c) ideal for comfort applications
(d) ideal for several industrial applications
3- Selection of a suitable air conditioning system dependson:
(a) Type of the building
(b) Initial and running costs
(c) Reliability and serviceability
(d) All of the above
3- Match the following:
(a) A large precision laboratory a. Variable air volumesystem
(b) Perimeter zone of a building b. Constant air volumesystem
(c) Simultaneous cooling and heating c. Multiple zone, single ductsystem
(d) A large building complex d. Dual duct system
4- A dedicated outside air unit is used to pre-cool 2,500CFM(1.18m3 /s) of outside air at
31 °C DB and 85% relative humidity to 15.5 °C DB, 14 °C WB. What isthe quantity of
water removed by the coil in GPM?
(a) 0.29 ?PM
(b) 0.33 ?PM
(c) 2.9 ?PM
(d) 2.4 ?PM
5- Which of the following statements are TRUE?
(a) Compared to central systems, the initial cost of a unitarysystem is less
(b) Unitary systems can be installed quickly and their operation isrelatively simple
(c) Unitary systems consume less power compared to central systemsof same capacity
(d) Unitary systems are ideal for retrofitting applications
6-Unitary refrigerant based systems are:
(a) used for very small capacities only
(b) are available only for cooling applications
(c) couldnot factory assembled with a performance guaranteed by themanufacturer
(d) also called as package units.
7- State which of the following statements are TRUE?
(a) By improving the internal air movement, the energy consumptionof the air
conditioning system can be reduced substantially
(b) By increasing air movement, the thermostat of the airconditioning system can be set at a lower temperature
(c) By increasing air movement, the thermostat of the airconditioning system can be
set at a higher temperature
(d) Solar chimneys are ideal under all conditions
8- valves that can be used for shutoff duty:
(a) butterfly,
(b) gate,
(c) ball
(d) All of the above.
9- A single zone, single duct, constant volume system:
(a) used for both cooling and heating simultaneously
(b) The cooling capacity is controlled by controlling the supplyair temperature
(c) not suitable when the space conditions have to be controlledprecisely
(d) can be used for large single rooms only
10- Dual duct systems are:
(a) provide either cooling or heating
(b) constant air volume systems
(c) energy efficient
(d) occupy more space compared to single duct systems
11-In all- water system of centeral air conditioning system
(a) Cooling medium is chilled water or brine water and not directrefrigerant
(b) The cooling medium may be supplied from a source away from theconditioned
space
(c) The cooling medium may be circulated through the coils of anair terminal
(d) All the above are true
12-In Dual-conduit system of All-Air system of airconditioning
(a) There are two separate air streams
(b) One of the two conduit is permanent by supplying cold andvariable air volume for
fluctuating internal and solar load
(c) One of the two conduit supplies constant air volume butvariable temperature air
for varying building transmission losses
(d) All of the above statements are true
13-Factors for selection of air conditioning system are
(a) Purpose, location, orientation, and shape of the space orbuilding
(b) Temperature, humidity, wind, exposure to sun and shade ofenvironments of the
space or building
(c) Occupancy, lighting, and other heat exchanges and heat storagecapability
(d) All of the above.
14- Which of the following statements are TRUE?
a) All water systems are suitable in buildings requiring individualroom control
b) In an air-water system, all the latent load on the building ishandled by the primary
air only
c) Dual duct systems are constant air volume systems
d) In all air systems, it is sometimes possible to switch of thecooling coil and use only
outdoor air for air conditioning
e) Variable air volume systems occupy less space compared toconstant volume systems
15- For air conditioning the operation theater in a hospital, thepercentage of outside air
in the air supplied is:
(a) Zero.
(b) 20
(c) 50
(d) 100.
16- The minimum temperature to which water can be cooled in acooling tower is:
(a) Dew point temperature of air
(b) Wet bulb temperature of air
(c) Dry bulb temperature of air
(d) Ambient air temperature.
17- The central air conditioning system has ___________ overallefficiency as compared
to individual systems.
(a) Same
(b) Lower
(c) Higher
(d) None of these
18- The choice of chiller determines how the facility is prepared.Examples of parameters
that determine the chiller are:
(a) Electrical requirements
(b) Ease of installation (air-cooled chillers are easier to setup)
(c) Location or available space
(d) Comfort or process cooling
(e) All of the above
19- Ventilated outdoor air can be used:
(a) for cooling of the buildings throughout the year in alllocations
(b) for cooling of the buildings during many days of the year inmost of the locations
(c) greater potential for cooling of buildings in hot and humidareas
(d) greater potential for cooling of buildings in hot and dryareas
20- State which of the following statements are TRUE?
a) For effective utilization of outdoor air, both natural andmechanical ventilation
should be used in a building
b) Design of windows and other openings in the buildings plays amajor role in
natural ventilation
c) For maximum airflow rate, the openings should be as close to theneutral pressure
level as possible
d) All of the above.
21- In comfort-cooling applications, cooling loads are oftensatisfied by air handlers
equipped with coils to transfer heat from the conditioned space airto circulating
chilled-water. Heat transferred from the loads can be controlled ina number of
ways:
a) Three-way valve
b) Two-way valve
c) Variable-speed pump
d) All of the above.
22- An air handler supplies 5,000 CFM (2.36m3 /s) at a temperatureof 13°C. The air handler
was designed for 1,000 CFM of outside air at 31°C DB and 26°C WB.The remaining
return air from the space is at 25 °C DB and 55% relative humidity.What are the
entering conditions of the air into the coil, in DB and WB?
(a) 26 C ?BT, 20 C ?BT
(b) 26 C ?BT, 15 C ?BT
(c) 29.5 C ?BT, 23.5 C ?BT
(d) 29.5 C ?BT, 24 C ?BT
23- In variable air volume systems:
(a) In single duct, variable air volume systems, the supply airflow rate remains
constant, but the temperature of the supply air is varied dependingupon the load
(b) Variable air volume systems generally consume less powercompared to constant
volume systems
(c) Variable air volume systems occupy less space compared toconstant volume
systems
(d) Variable air volume systems always ensure adequate ventilationand good room
air distribution
24- For air-water system, Which of the followingstatements are TRUE?
(a) An air-water system uses both air and water in the thermaldistribution system
(b) In an air-water system, all the latent load on the building ishandled by the
primary air only
(c) In an air-water system, the cooling coil kept in theconditioned space operates
under dry conditions
(d) Compared to all water systems, an air-water system is difficultto maintain
25- For fan coil unit ,Which of the following statements areTRUE?
(a) A fan coil unit is used with all water systems only
(b) A fan coil unit can be used either with an all water system orwith an air-water
system
(c) It is possible to control the cooling capacity by controllingeither liquid flow rate
or air flow rate in a fan coil unit
(d) A fan coil unit used in an all water system requires aprovision for draining the
condensed water
26- For a convector, Which of the following statements areTRUE?
(a) In a convector, heat transfer takes place by forcedconvection
(b) Convectors are commonly used for heating applications
(c) In a radiator, heat transfer takes place by both radiation andconvection
(d) A unit ventilator is a fan coil unit with a provision for freshair entry
27- For Small unitary systems, Which of the following statementsare TRUE?
(a) Small unitary systems have air cooled condensers, while largersystems can be
either air cooled or water cooled
(b) A split type room air conditioner should be used when the roomdoes not have an
exterior wall
(c) A split type air conditioner is more reliable compared to awindow air conditioner
(d) It is possible to provide fresh air in a window airconditioner, whereas this is not
possible in a split air conditioner
