Worksheets18th Edition appendices mock 1
Total questions: 10
Worksheet time: 20mins
Name
Class
Date
1.
A circuit uses a 45-amp BS 88-3 cartridge fuse as a means of protection, what is the tabulated disconnection time for an overcurrent of 550 amps?
a)
a) 0.1 second
b)
b) 0.2 second
c)
c) 0.4 second
d)
d) 1.0 second
2.
Which BS standard covers ceiling roses?
a)
a) BS 5655
b)
b) BS 67
c)
c) BS EN 81
d)
d) BS EN 50438
3.
Which is the principal organisation responsible for 'Distributors Installations' in the UK?
a)
a) The heaIth and safety executive
b)
b) The local authority organisation
c)
c) The department for innovation and skills
d)
d) The home department
4.
The group rating factor for a group of five different sized sheathed cables is?
a)
a) 0.325
b)
b) 0.447
c)
c) 0.528
d)
d) 0.632
5.
With reference to energy efficiency systems, on-site renewable energy sources?
a)
a) Increase the efficiency of an electrical installation
b)
b) Reduce the efficiency of an electrical installation
c)
c) Reduce the overall public electricity network losses
d)
d) May be considered a direct energy efficiency measure
6.
When measuring the prospective fault current in a three-phase installation the highest prospective fault current will occur?
a)
a) When a short circuit develops between a line and neutral conductor
b)
b) When a short circuit develops between a line and earth conductor
c)
c) When a short circuit develops between two-line conductors
d)
d) When a short circuit develops simultaneously between all line conductors
7.
With reference to AC motors used within an energy efficiency system, what method can be used to achieve higher energy efficiency?
a)
a) Install less powerful motors
b)
b) Install more powerful motors
c)
c) Install variable speed drives
d)
d) Install fixed speed drives
8.
With reference to energy efficiency system, to obtain a load profile, measurement of energy used should be recorded over a minimum period of?
a)
a) 1 hour
b)
b) 5 hours
c)
c) 12 hours
d)
d) 24 hours
9.
With reference to energy efficiency systems, consideration should be given to improving load power factor to?
a)
a) Reduce tariff penalties
b)
b) Reduce the harmonic distortion in the system
c)
c) Reduce the maintenance required
d)
d) Reduce the impulse withstand voltage
10.
A 70°C thermoplastic cable is ran in free air through a bakery with an expected ambient temperature of 40°C. What cable-rating factor should be applied to the current carrying capacity?
a)
a) 1.00
b)
b) 0.94
c)
c) 0.87
d)
d) 0.79
100 %
