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Flashcards in Electrical Deck (189)
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1

Which of the following building types would have the most stringent requirements for fire alarm and fire suppression systems? A. motel B. nursing home C. office building D. print shop

B. Nursing home Occupants of institutional buildings, such as hospitals, prisons, and nursing homes, often have limited mobility and require more warning and time to evacuate.

2

What are transformers used for?

Used to change ac voltages up or down

3

Information regarding the minimum number of plumbing fixtures required for various occupancies may be found in which of the following sources? A. building codes B. plumbing codes C. both plumbing and building codes D. the local authority having jurisdiction

C. both plumbing and building codes

12

Interior doors are not to exceed _____ opening force.

5 lbs

13

1. Which one is not a disadvantage of aluminum conductors? a) Cold flow under pressure b) Splicing and terminating difficulties c) Vulnerability to oxidation d) Weight

d) Weight

14

What is a disadvantage of Cable tray? a) It is free-air rated b) Installation and maintenance is costly c) It is not accessible easily d) It does not work for high wattage

c) It is not accessible easily

15

Which statement is correct ? a) Conduits can have diameter 1/3 of the slab thickness. b) Conduits running parallel can be spaced as close as .5” far apart. c) Min cover over conduit shall be 3⁄4”

c) Min cover over conduit shall be 3⁄4”

16

How much cost under floor duct system would add to the building’s electric system cost? 1) 10% 2) 30% 3) 40% 4) 50%

4) 50%

17

What is the appropriate length of ground Rod ? a) 2’min – 4’ Max b) 4’min – 6’ Max c) 6’min – 8’ Max d) 8’min – 10’ Max

d) 8’min – 10’ Max

18

What are the max height of switch box and min height of the receptacle above the finished floor? a) 48” max- 15” min b) 44” max- 18” min c) 48” max- 18” min d) 44” max- 15” min

a) 48” max- 15” min

19

What is the min space requirement around high voltage switchgear? a) 3’-6” b) 5’ c) 6’ d) 8’-6”

c) 6’

21

When is electric wiring system being inspected by local authorities? I) After raceways been installed II) After the entire job is complete III) After the equipment is installed a) I, II b) I, III c) II, III d) I, II, III

a) I, II

22

Which one is not the characteristic of Parallel circuits? a) It has one branch connected between the same two points. b) Loads on the current are additive c) The same voltage is imposed on each load. d) It is the standard circuit arrangement in all building wiring.

a) It has one branch connected between the same two points.

25

What is the predominant use of electrical power in a building? a) Motor b) Lighting c) Heating d) HVAC

b) Lighting

26

What is the minimum gauge wire allowed in construction? a) 12 b) 14 c) 16 d) 18

b) 14

27

Name the 3 different plant types a. Electric, hydronic, and forced air b. Boiler/chillers, Refrigeration cycle, Heat pump c. Single pipe, two pipe, three pipe d. Single duct, electric reheat, dual duct

b. Boiler/chillers, Refrigeration cycle, Heat pump

28

The Hydronic system that may only be extended a very limited distance because each subsequent register gets colder is: a. single pipe b. two pipe c. three pipe d. four pipe

a. single pipe

29

If both heating and cooling are desired a separate two pipe system can be provided for each, Resulting in a ______ a. Single pipe system b. Two pipe system c. Three pipe system d. Four pipe system

d. Four pipe system

30

A ______ mixes both the hot and cold in a common return pipe. a. Single pipe system b. Two pipe system c. Three pipe system d. Four pipe system

c. Three pipe system

31

True or False: electrical systems are the most expensive first costs and the least expensive in life cycle cost.

False

32

A small Valve in the base of the cooling tower is called a ______ a. Evaporator b. Downdraft c. Condenser d. Blowdown

d. Blowdown

33

10. the Heat Pump ______ a. Creates heat energy b. Moves heat energy c. Harnesses heat energy

b. Moves heat energy

34

A Prescriptive code: a. State what the final results need to be and how it will be measured, but does not specify how the result is to be achieved. b. States how to build a building.

b. States how to build a building.

35

Makeup air handling unit is ______ a. An HVAC system that pulls outside air into the serviced room through the mechanical unit. Used with large buildings that would otherwise require extensive ducting. Used when separate utility bills are required. b. Refers to the cooling air, the treatment of the air for temperature and humidity control, air quality and circulation. c. Air handling unit specifically design to apply 100% outside air to the space. This outside air replaces air lost through exhaust fans or the building envelope. d. Air handling unit specifically design to apply 50% outside air to the space. This outside air mixes with internal in the building.

c. Air handling unit specifically design to apply 100% outside air to the space. This outside air replaces air lost through exhaust fans or the building envelope.

37

What is the requirement for ductwork in a fire rated wall? a. Fire damper b. Fire blanket c. Fire stopping d. Fire Alarm

a. Fire damper

42

What does a compression tank do for a boiler?

Accommodates the expansion of the water in the system

44

How is an EMT conduit system joined together?

Set screw and pressure fittings

45

Why is EMT and IMC conduit more cheaper to install over rigid steel conduit?

Both are lighter and both have larger inside diameters (ID) and therefore easier wire pulling

46

True or false. Ordinary steel pipe may be used for conduit?

False

47

When steel conduit is installed in direct contact with earth, how should the conduit be treated?

is is advisable to coat joints with asphaltum. If earth is wet, the entire system should be coated with waterproofing. Alternatively, a plastic jacket conduit can be used