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Unit 38 Multiple Choice Revision

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unknown JTL Unit 36 and 38 Revision Quiz on Unit 38 Multiple Choice Revision, created by giannini.chambers on 15/04/2015.
giannini.chambers
Quiz by giannini.chambers, updated more than 1 year ago
giannini.chambers
Created by giannini.chambers over 9 years ago
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Resource summary

Question 1

Question
What does Cg relate to in cable calculations?
Answer
  • Grouping factor
  • Ambient temperature
  • Insulation factor
  • Burred depth factors

Question 2

Question
Zs=
Answer
  • R1+R2
  • Ze+R1
  • External loop impedance
  • Earth fault loop impedance

Question 3

Question
When calculating maximum Zs for a circuit design what is the 1.2 multiplier used to account for?
Answer
  • Increase in conductor temperature
  • Human error in measurement
  • Decrease in earth fault current
  • Parallel paths

Question 4

Question
What is the maximum permissible voltage drop for lighting in a final circuit?
Answer
  • 2.5%
  • 5%
  • 3%
  • It depends on the starting voltage

Question 5

Question
What is the formula for voltage drop?
Answer
  • (Ib x Length x mV/A/m)/1000
  • Ib x Length x mV/A/m
  • (In x Length x mV/A/m)/1000
  • In x Length x mV/A/m

Question 6

Question
What does In stand for?
Answer
  • Nominal current rating of the protective device
  • Design curent
  • Ingress notation
  • Notional current

Question 7

Question
If an RCD is to be for additional protection, how many tests should be carried out on it?
Answer
  • 6
  • 4
  • 3
  • 5

Question 8

Question
What is the rated current for an RCD that is to be used as additional protection?
Answer
  • 30mA
  • 50mA
  • 300mA
  • 30A

Question 9

Question
What does maintenance factor in lighting design relate to?
Answer
  • The cleanliness of the room
  • The cleanliness of the lamps
  • The lamp deterioration
  • All of the above

Question 10

Question
Which out of the following relate to utilisation factor?
Answer
  • Reflectance values of the ceiling, wall and floor
  • How often people are using a room
  • How often the lights are left on when people have left
  • The floor area of the room being lit

Question 11

Question
A room is to be illuminated to 350 lux. The maintenance factor is 0.85, utilisation factor is 0.8 and the room measures 6m by 8m. Calculate the number of fittings required if each fitting is 100W and has an efficacy of 70 lumens/watt.
Answer
  • 10
  • 6
  • 4
  • 3

Question 12

Question
What maintenance should be carried out on a motor to ensure correct working:
Answer
  • Continuity of windings
  • Insulation resistance of the windings
  • Insulation resistance between the windings and the case
  • Changing of bearings
  • Cleaning of luminaires in room
  • Varnishing of shaft
  • Monthly rotation of end plates

Question 13

Question
What types of earthing rely on the distributor's earthing arrangement?
Answer
  • TT
  • TNCS
  • TNS

Question 14

Question
How may PFC be obtained?
Answer
  • Calculation, enquiry and measurement
  • Enquiry and measurement
  • Measurement only
  • Enquiry only

Question 15

Question
What earthing system has a combined earth and neutral conductor back to the transformer?
Answer
  • TNCS
  • TT
  • IT
  • TNS

Question 16

Question
What is the maximum permitted voltage drop for a final power circuit?
Answer
  • 3%
  • 5%
  • 2%
  • 9%

Question 17

Question
A fault of negligible impedance between a live conductor and earth is known as?
Answer
  • PSCC
  • PEFC
  • PC
  • PEEC

Question 18

Question
How can earth fault loop impedance relate to the disconnection time of a circuit breaker?
Answer
  • Zs relates to fault current
  • Zs relates to RCD operating time
  • Zs relates to nominal voltage
  • Zs relates to full load current of the circuit

Question 19

Question
It is acceptable to run single core cables on metal tray
Answer
  • True
  • False

Question 20

Question
It is acceptable to run single core cables in metal trunking
Answer
  • True
  • False

Question 21

Question
What is the most suitable containment method for an outside motor to be connected to the electrical supply?
Answer
  • SWA
  • Metal conduit
  • Metal trunking
  • Cable basket

Question 22

Question
What does Ci relate to in cable calculations?
Answer
  • Thermal insulation
  • Above ordinary current
  • Initial load current
  • Installation

Question 23

Question
An installation with a nominal voltage of 230V has an external loop impedance of 0.2Ω and an external line to neutral voltage of 0.18Ω. What would the PFC be recorded on the test certificate?
Answer
  • 1150A
  • 1278A
  • 2kA
  • 1.8kA

Question 24

Question
When measuring PSSC the earth should be removed from the installation.
Answer
  • True
  • False

Question 25

Question
When measuring PEFC your terminals will be connected between line, neutral and the earth bar.
Answer
  • True
  • False

Question 26

Question
Single phase circuit is run in trunking with 3 other circuits. The ambient temperature for the room is 35° . The design current is 33A and the protective device an MCB to BS 60898. What is the minimum size 70° single-core thermoplastic cable that can be used taking into account current carrying capacity only?
Answer
  • 6mm²
  • 10mm²
  • 16mm²
  • 25mm²

Question 27

Question
There are 7 x 10mm², 5 x 6mm², 4 x 25mm² and 8 x 2.5mm² single phase circuits to be installed in trunking. Calculate the size required if all cables are PVC BS 6004 cables.
Answer
  • 50mm x 50mm
  • 75mm x 50mm
  • 75mm x 75mm
  • 100 x 75mm

Question 28

Question
A 5m run of conduit with 2 bends in it is to accommodate 2 ring final circuits of 2.5mm². Calculate the minimum size conduit to be used.
Answer
  • 32mm
  • 25mm
  • 20mm
  • 16mm

Question 29

Question
Electrocution doesn't always result in death
Answer
  • True
  • False

Question 30

Question
Which of the following should be included in a risk assessment
Answer
  • Details of the hazard/risk
  • Control measures to be applied
  • Applicable standards to the risk assessment
  • The evaluation of the risks
  • Dates of review
  • Company financial information
  • Serial numbers of PPE equipment
  • Time sheets
  • The address of all contributors to the risk assessment

Question 31

Question
A store room must be illuminated to 200 lux. The size of the room is 9m x 10m, the room is kept fairly clean (M.F of 0.9) and due to god colour management and space ratios the U.F is 0.9. Calculate how many light fittings are to be used if each fitting contains 2 lamps of 2000 lumens each.
Answer
  • 3
  • 4
  • 5
  • 6
  • 7
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