Question

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 set up)

(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 all locations

(b) for cooling of the buildings during many days of the year in most of the locations (c) greater potential for cooling of buildings in hot and humid areas

(d) greater potential for cooling of buildings in hot and dry areas

20- State which of the following statements are TRUE?

a) For effective utilization of outdoor air, both natural and mechanical ventilation

should be used in a building

b) Design of windows and other openings in the buildings plays a major role in

natural ventilation

c) For maximum airflow rate, the openings should be as close to the neutral pressure

level as possible

d) All of the above.

21- In comfort-cooling applications, cooling loads are often satisfied by air handlers equipped with coils to transfer heat from the conditioned space air to circulating

chilled-water. Heat transferred ways:

a) Three-wayvalve

b) Two-wayvalve

c) Variable-speed pump

d) All of the above.

from the loads can be controlled in a number of

22- An air handler supplies 5,000 CFM (2.36m3/s) at a temperature of 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 air flow rate remains

constant, but the temperature of the supply air is varied depending upon the load (b) Variable air volume systems generally consume less power compared to constant

volume systems

(c) Variable air volume systems occupy less space compared to constant volume

systems

(d) Variable air volume systems always ensure adequate ventilation and good room

air distribution

24- For air-water system, Which of the following statements are TRUE?

(a) An air-water system uses both air and water in the thermal distribution system (b) In an air-water system, all the latent load on the building is handled by the

primary air only

(c) In an air-water system, the cooling coil kept in the conditioned space operates

under dry conditions

(d) Compared to all water systems, an air-water system is difficult to maintain

25- For fan coil unit ,Which of the following statements are TRUE?

(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 or with an air-water

system

(c) It is possible to control the cooling capacity by controlling either liquid flow rate

or air flow rate in a fan coil unit

(d) A fan coil unit used in an all water system requires a provision for draining the

condensed water

26- For a convector, Which of the following statements are TRUE?

(a) In a convector, heat transfer takes place by forced convection

(b) Convectors are commonly used for heating applications

(c) In a radiator, heat transfer takes place by both radiation and convection (d) A unit ventilator is a fan coil unit with a provision for fresh air entry

27- For Small unitary systems, Which of the following statements are TRUE?

(a) Small unitary systems have air cooled condensers, while larger systems can be

either air cooled or water cooled

(b) A split type room air conditioner should be used when the room does not have an

exterior wall

(c) A split type air conditioner is more reliable compared to a window air conditioner (d) It is possible to provide fresh air in a window air conditioner, whereas this is not

possible in a split air conditioner

Answer 1