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300725 - CT6
Multiple choice questions - complete pool of questions used for final exam.
| Question | Answer |
|---|---|
| 1. The heat gain due to the solar radiation through the windows of a building in the mid latitudes reaches a maximum value for a North exposure at about:- | (c) 2 pm June |
| 2. Consider a building with a North glazed facade, the other three walls being blank. This configuration has a smaller cooling load than the same with the glazed facade orientated East or West because:~ | (c) The maximum solar gain for this configuration occurs at the same time as the minimum transmission load. |
| 3. Which of the following solar shading methods would be most effective for reducing the solar radiation heat gain through an East facing window? | (d) External vertical louvres. |
| 4. Which of the shading devices, listed in question 3, would be most effective for reducing the summertime transmission heat load. | (e) Double glazing. |
| 5. The total cooling load on a building n1ay be represented as either Sensible (Sen) and/or Latent (Lat), and either as a heat Gain and/or Loss to the air conditioning system. Which of the following is correct? | (e) Outside air |
| 6. If the sun is momentarily obscured by dense cloud, the space temperature in an air conditioned building does not fall immediately because.- | (c) heat is liberated from the structure of the building. |
| 7. The space dry bulb temperature is normally set at a lower value in winter than in summer:- | (d) Because people tend to wear heavier clothing indoors. |
| 8 The indoor comfort temperature in summer can range from about 22 to 27 C depending on the application. In which of the following buildings would a comfort temp of 27°C probably be acceptable. | (c) Supermarket |
| 9. Consider an independent air conditioned restaurant located in a large office building. Five possible reasons for zoning the restaurant separate from the main office a/c are given. Which one is not a good and sufficient. reason? | (b) A greater sensible cooling load /m2 is to be expected |
| 10. The depth of a perimeter zone. measured from the outside wall depends on:- | (a) The anticipated minimum office size. |
| 11. A large central heating systen1 norn1ally requires extra capacity to provide for start-up after a cold shut-do\vn during winter. The ainount of extra capacity is independent of:- | (b) The intensity of lighting and solar load during \\linter. |
| 12. A central cooling syste1n (unlike a heating syste1n) does not. require extra chiller set capacity because:- | (b) At the time of peak cooling load the building's structure has norn1ally cooled down |
| 13. The equation Q = 1.21 x V x TD means that:- | (c) The voltune of air delivered depends on the sensible heat gain to the space. |
| 14. The air velocity int.he ducts of a 'Low velocity' syste1n lies \vi.thin the range:- | (d) 5 to 7 m/s |
| 15. Brickwork ducts normally leak but are satisfactory for:- | (e) Exhaust ducts under negative pressure. |
| 16. Rectangular cross-section ducts have a limited 'Aspect Ratio'. Which of the following ducts has a ratio greater than the limit? | (d) 400 x 75mm |
| 17. Variable volume terminal units are typicllily installed within the occupied space. When operating in cooling mode these units:- | (d) Supply air at a rate dependent on the cooling load |
| 18. Which of the following is required for maximising the operating efficiency of a reverse-cycle heating unit during winter? | (c) The winler outdoor temperature must be mild. |
| 19. The occupants of an air conditioned home have greater control over their own comfort than is possible in a commercial office because of several factors. Which of the following factors is not relevant? | (e) The sensitivity of the thermostats |
| 20. A variable volume air conditioning system has characteristics different from a constant volume system. Which of the following is not true for a variable volume system:- | (d) A relatively large amount of energy is consumed |
| 21. A constant volume air conditioning system has characteristics different from a variable volume system. Which of the following is not true for a constant volume system:- | (e) The air noise generated is marginally more disturbing. |
| 22. Air conditioned zones are usually required because of the heat load variations on a building. For a defined zone the variation in sensible heat gain in summer must be:- | (b) Uniform over the whole area |
| 23. Winter heating is not mandatory by building code for which of the following buildings? | (e) Private home |
| 1. Multiple groups ( e.g.high, medium and low rise) of passenger lifts are normally required in a large building when:- | (d) the number of lifts for a single group exceeds 8 |
| 2. When comparing the suitability of moving walks and escalators of the same capacity which of the follo\ving is incorrect. A moving walk:- | (d) gives a greater restriction to traffic flow when stopped |
| 3. Which of the following statements is incorrect. A comparison of 'bottom drive' and 'top drive' traction lifts would show that a bottorn drive lift:- | (e) imposes much less load on the structure. |
| 4. A lift analysis for a proposed building shows that the waiting interval is worse, and the 5 minute handling capacity is better than required. Which of the following changes is suggested:- | (d) decrease the lift car size |
| 5. The relationship between 'Round Trip Time' and 'Waiting Interval' depends on:- | (b) the number of lifts |
| 6. High speed lifts are particularly suitable when:- | (b) more than 8 lifts are required |
| 7. Which of the following is not a relevant factor for estimating the waiting interval for a group of lifts. | (d) the type of lift drive |
| 1. Electricity is generated at a frequency of 50 Hz because:- | (d) the generators run at 3000 revolutions per minute |
| 2. In a three phase electrical power supply the neutral conductor:- | (c) carries any unbalanced out-of-phase current |
| 3. ln a large building the principal use for D.C. power is for:- | (d) emergency power for exit signs and stairway lighting |
| 4. Electricity is transrnitted at very high voltage over large distances because this:- | (b) minimises transmission power losses |
| 1. The principal factor which determines the fire hazard in a building such as a nursing home is:- | (b) the class of occupancy |
| 2. Compared with an electrically driven pump, a diesel pump is intended to provide:- | (c) a secondary supply in case of electric mains failure |
| 3. A fire hydrant water storage tank must be large enough to provide:- | (a) a 10 minute supply while the firefighters set up their equipment |
| 4. Both hydrants and hose reels may be installed in a building. Which of the following statements is correct? | (c) The hose reels are used only by the public during the initial stage of a fire |
| 5. A Grade 1. water supply for a sprinkler system is defined as having:- | (c) Two independent. sources of water supply |
| 6. The spacing between fire sprinkler heads depends on;. | (e) the fire hazard of the building |
| 7. The national building code provides for several methods of smoke extract control. Which method is not acceptable? | (b) through a non fire-isolated stair |
| 8. The occupied areas of a building greater than 25m above street level represent a severe fire hazard because:- | (c) the fire may need to be fought from inside the building |
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