21⟩ Which of the following documents is non-statutory?
* a) Health and Safety at Work Act
* b) Electricity at Work Regulations
* c) COSHH
* d) BS 7671- Requirements for Electrical Installations
Answer – d
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105 Electrical Engineering Questions And Answers
22⟩ An increase in current through a conductor will lead to
* a) A decrease in conductor temperature
* b) A decrease in conductor resistance
* c) An increase in insulation resistance
* d) An increase in conductor temperature
Answer – d
23⟩ A single rotation of an alternator, intended to provide a 50 Hz supply frequency, will take
* a) 2 ms
* b) 20 ms
* c) 50 ms
* d) 5000 ms
Answer – b
24⟩ Using a scale of 150, a 10 mm measurement taken from a plan would be equal to an actual measurement of
* a) 5 mm
* b) 5 cm
* c) 0.5 m
* d) 5 m
Answer – c
25⟩ An independent regulatory body responsible for monitoring standards of electrical installation contractors is the
* a) Electrical Institute Council
* b) Institute of Electrical Engineers
* c) National Electrical Contractors Institute Inspection Council
* d) National Inspection Council for Electrical Installation Contractors
Answer – d
26⟩ CO2 fire extinguishers are indicated by the color code
* a) Black
* b) Red
* c) Beige
* d) Blue
Answer – a
27⟩ To ensure that a particular item of electro technical equipment meets a particular British Standard or BSEN Harmonized Standard, the best source of information would be the
* a) manufacturer of the equipment
* b) British Standards Institute
* c) Institute of Electrical Engineers
* d) Supplier of the equipment
Answer – a
28⟩ The Tesla is the unit of
* a) Magnetic flux
* b) Molecular flux
* c) Magnetic flux density
* d) Molecular flux density
Answer – c
29⟩ The maximum operating temperature for a thermoplastic (pace) insulated cable with copper conductors is
* a) 60 OC
* b) 70 OC
* c) 105 OC
* d) 160 OC
Answer – b
30⟩ For a drawing having a scale of 150, a wall 10 m long would be drawn to a length of
* a) 10 mm
* b) 20 cm
* c) 50 cm
* d) 10050 mm
Answer – b
31⟩ If a circuit protective device requires 200 A in order to disconnect in the required time, the overall impedance of the earth fault path for a 230 V circuit protected by the device must not exceed
* a) 0.86 O
* b) 1.15 O
* c) 2.15 O
* d) 2.30 O
Answer – b
32⟩ The ratio of the true power to apparent power in an ac circuit is the
* a) Power consumption
* b) Harmonic current
* c) Power factor
* d) Reactive power
Answer – c
33⟩ Which of the following is a non-statutory regulation?
* a) Electricity at Work Regulations
* b) Health and Safety at Work Act
* c) Electricity Safety, Quality, and Continuity Regulations
* d) BS 7671- Requirements for Electrical Installations
Answer – d
34⟩ In order to determine the amount of accessories required for a particular contract, the best method would be to use the layout drawings and a
* a) Site diary
* b) Take off sheet
* c) Day work sheet
* d) Time sheet
Answer – b
35⟩ In order to prove safe isolation of an electrical circuit, it is essential to use
* a) A multi-meter
* b) An insulation resistance tester
* c) An approved voltage indicator
* d) A low reading ohmmeter
Answer – c
36⟩ On a large construction site, inductions are carried out for new members of staff in order to inform them of the
* a) Location of the canteen
* b) Requirements within BS 7671
* c) Fire safety procedure
* d) Location of the nearest wholesaler
Answer – d
37⟩ Before any work is done within an electrical installation, the first procedure would be to
* a) Carry out a risk assessment
* b) Turn off the main switch
* c) Remove all components
* d) Install temporary supplies
Answer – c
38⟩ Which of the following is a transmission voltage?
* a) 400 kV
* b) 33 kV
* c) 400 V
* d) 230 V
Answer – a
39⟩ A particular extension lead used on a construction site is colored yellow to
* a) Indicate its mechanical stress properties
* b) Enable it to be seen in the dark
* c) Indicate the supply voltage to it
* d) Enable it to be to be identified as suitable for site use
Answer – c
40⟩ A suitable means of recording the number of visitors on a large construction site is by the use of a
* a) Day work sheet
* b) Timesheet
* c) Take off sheet
* d) Visitors book
Answer – d
