Test
Unit 38 Multiple Choice Revision
Preguntas del test (31)
1What does Cg relate to in cable calculations?
- AGrouping factor
- BAmbient temperature
- CInsulation factor
- DBurred depth factors
2Zs=
- AR1+R2
- BZe+R1
- CExternal loop impedance
- DEarth fault loop impedance
3When calculating maximum Zs for a circuit design what is the 1.2 multiplier used to account for?
- AIncrease in conductor temperature
- BHuman error in measurement
- CDecrease in earth fault current
- DParallel paths
4What is the maximum permissible voltage drop for lighting in a final circuit?
- A2.5%
- B5%
- C3%
- DIt depends on the starting voltage
5What is the formula for voltage drop?
- A(Ib x Length x mV/A/m)/1000
- BIb x Length x mV/A/m
- C(In x Length x mV/A/m)/1000
- DIn x Length x mV/A/m
6What does In stand for?
- ANominal current rating of the protective device
- BDesign curent
- CIngress notation
- DNotional current
7If an RCD is to be for additional protection, how many tests should be carried out on it?
- A6
- B4
- C3
- D5
8What is the rated current for an RCD that is to be used as additional protection?
- A30mA
- B50mA
- C300mA
- D30A
9What does maintenance factor in lighting design relate to?
- AThe cleanliness of the room
- BThe cleanliness of the lamps
- CThe lamp deterioration
- DAll of the above
10Which out of the following relate to utilisation factor?
- AReflectance values of the ceiling, wall and floor
- BHow often people are using a room
- CHow often the lights are left on when people have left
- DThe floor area of the room being lit
11A 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.
- A10
- B6
- C4
- D3
12What maintenance should be carried out on a motor to ensure correct working:
- AContinuity of windings
- BInsulation resistance of the windings
- CInsulation resistance between the windings and the case
- DChanging of bearings
- ECleaning of luminaires in room
- FVarnishing of shaft
- GMonthly rotation of end plates
13What types of earthing rely on the distributor's earthing arrangement?
- ATT
- BTNCS
- CTNS
14How may PFC be obtained?
- ACalculation, enquiry and measurement
- BEnquiry and measurement
- CMeasurement only
- DEnquiry only
15What earthing system has a combined earth and neutral conductor back to the transformer?
- ATNCS
- BTT
- CIT
- DTNS
16What is the maximum permitted voltage drop for a final power circuit?
- A3%
- B5%
- C2%
- D9%
17A fault of negligible impedance between a live conductor and earth is known as?
- APSCC
- BPEFC
- CPC
- DPEEC
18How can earth fault loop impedance relate to the disconnection time of a circuit breaker?
- AZs relates to fault current
- BZs relates to RCD operating time
- CZs relates to nominal voltage
- DZs relates to full load current of the circuit
19It is acceptable to run single core cables on metal tray
- AVerdadero
- BFalso
20It is acceptable to run single core cables in metal trunking
- AVerdadero
- BFalso
21What is the most suitable containment method for an outside motor to be connected to the electrical supply?
- ASWA
- BMetal conduit
- CMetal trunking
- DCable basket
22What does Ci relate to in cable calculations?
- AThermal insulation
- BAbove ordinary current
- CInitial load current
- DInstallation
23An 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?
- A1150A
- B1278A
- C2kA
- D1.8kA
24When measuring PSSC the earth should be removed from the installation.
- AVerdadero
- BFalso
25When measuring PEFC your terminals will be connected between line, neutral and the earth bar.
- AVerdadero
- BFalso
26Single 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?
- A6mm²
- B10mm²
- C16mm²
- D25mm²
27There 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.
- A50mm x 50mm
- B75mm x 50mm
- C75mm x 75mm
- D100 x 75mm
28A 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.
- A32mm
- B25mm
- C20mm
- D16mm
29Electrocution doesn't always result in death
- AVerdadero
- BFalso
30Which of the following should be included in a risk assessment
- ADetails of the hazard/risk
- BControl measures to be applied
- CApplicable standards to the risk assessment
- DThe evaluation of the risks
- EDates of review
- FCompany financial information
- GSerial numbers of PPE equipment
- HTime sheets
- IThe address of all contributors to the risk assessment
31A 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.
- A3
- B4
- C5
- D6
- E7
Información
- Descripción
- unknown JTL Unit 36 and 38 Revision Test sobre Unit 38 Multiple Choice Revision, creado por giannini.chambers el 15/04/2015.
- Autor
- giannini.chambers
- Idioma
- English
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