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plandesign 3
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Questions in this quiz (25)
1What device is described here: The 'It' rating must be equal to or above the
normal operating current of the circuit?- Aa fuse
- Bdistribution board
- Cjunction box
- Dfuse-board
2What device is described here: The 'It' rating must be equal to or above the
normal current carrying capacity of the protective device?- Acable
- Bload
- Cconsumer unit
- Dswitch
3Calculate the total current demand for a domestic lighting circuit if
contains 20 x 100 W GLS filaments and the factor for diversity is 66%.- A7.8A
- B8.69A
- C6A
- D5.7A
4When cabling is routed through insulation, the rated:
- Acurrent carrying ability will be increased
- Bcurrent carrying ability will stay exactly the same
- Ccurrent carrying ability will be doubled per metre
- Dcurrent carrying ability will be decreased
5If voltage drop in a final circuit is found to be excessive the corrective action
is to:- Alimit the time the load is connected
- Bboost the voltage through a transformer
- Cdecrease the size of the supply cable
- Dincrease the size of the supply cable
6When overload and overcurrent protection is necessary which of the following is correct?
- AIb ≥ In ≥ Iz
- BIb ≤ In ≥ Iz
- CIb ≤ In ≤ Iz
- DIb ≥ In ≤ Iz
7One disadvantage of using the tabulated values of Ze in the On-Site Guide is ?
- Athey are hard to read
- Bthe values could be high
- Cthe values are unreliable
- Dthe values could be low
8Whehen checking earth loop impedance values which of the following can be used directly without correction?
- ABS 7671
- Bwiring regulations
- COn-Site Guide
9A domestic cooker rated at a maximum load of 60 A is controlled by a cooker control unit, which does not have a 13 A socket outlet. Using Table A1 of the On-Site Guide, and ater allowing for diversity, calculate the design current.
- A20A
- B25A
- C18A
- D30A
10Correction factors as appliled to de-rate system cables are:
- Athermal insulation, grouping, re-wireable fuses and ambient
temperature - Boutside insulation, grouping, re-wireable fuses and ambient
temperature - Cusing SNA cable, grouping, re-wireable fuses and ambient temperature
- DThermal insulation, bare wires, re-wireable fuses and ambient
temperature
- Athermal insulation, grouping, re-wireable fuses and ambient
11Which of the following should be recorded regarding the PFC (Prospective Fault Current) ?
- Athe prospective short circuit current
- Bthe highest value PFC at the point of supply
- Cthe higher value PFC at the furthermost point of the circuit
- Dthe prospective earth fault current
12Why is thermal constraint particularly important when instaling with PVC flat
profile cable?- Ait is cheap in comparison to other types
- Bits CPC does not come with earthing sleeving
- Cits CPC is bigger than the live conductors
- Dits CPC is smaller than the live conductors
13To ensure the effective operation of the overcurrent protective devices, the earth fault loop path must have:
- Aa 230V supply
- Bvery low resistance
- Cfuses or CBs in the live conductor
- Dvery high resistance
14Shock protection ensures that:
- Athe protective device operates within a specified time
- Bthe actual loop impedance values are less than specified
- Cthe PFC is low enough to operate the protective devices in time
- Dthe circuit is switched off in time
15According to IET Regulation 411.3.2.2 all final circuits not exceeding 32 A in a building supplied with a 230 V TN supply shall have a maximum disconnection time not exceeding:
- A0.2 s
- B0.4 s
- C5.0 s
- Dunlimited
16The current demand of 10 - 65 W fluorescent tubes connected to a 230V supply is:
- A5.08 mA
- B5.09 A
- C150 W
- D650W
17Use the On-Site Guide (Appendix A) to calculate the assumed current demand of a cooker having 4 - 3 KW boiling rings and a 2 kW oven connected to a 230 V supply. The cooker control unit includes a socket
Outlet.- A60.86 A
- B30.26 A
- C25.25 A
- D10 A
18The total current demand of a lighting circuit in an individual household is
calculated to be 5 A. The current demand applying the diversity factor given
in Table A2 of the On-Site Guide will be:- A3.3 A
- B3.75 A
- C4.5 A
- D5.0 A
19The volt drop in mV per ampere per metre of a two-core single-phase 6.0 mm cable as given in Table F5 (Ii) of the On-Site Guide:
- A18
- B11
- C7.3
- D4.4
20The volt drop in mV per ampere per metre of a two-core single phase 10.0 mm cable as given in Table F5 (ii) of the On-Site Guide is :
- A18
- B11
- C7.3
- D4.4
21What % volt drop is associated with a power circuit?
- A3%
- B4%
- C5%
- D6%
22A cooker can be fitted with a smaller cable after applying?
- Adiscrimination
- Bdiversity
- Ccircuit correction
- Dcorrection due to a semi-enclosed fuse
23Which of the following is the correction factor regarding semi-enclosed fuses?
- ACf
- BCi
- CCa
- DCg
24Which of the following represents design current?
- AIb
- BI²
- CIz
- DIe
25A domestic instantaneous heater is rated at 3 kW. Given that the voltage is 230 V, work out its design current.
- A76.6 A
- B0.07 A
- C13.04 A
- D690 A
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- Quiz on plandesign 3, created by Lukasz Kwiatkowski on 24/06/2022.
- Author
- Lukasz Kwiatkowski
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- English
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