41⟩ The purpose of a bonding conductor is to provide
* a) An earth fault path
* b) An equal potential zone
* c) Short circuit protection
* d) Overload protection
Answer – b
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105 Electrical Engineering Questions And Answers
42⟩ The order in which they should be carried out is
* a) 1, 3, 2, 4, 5
* b) 1, 2, 3, 4, 5
* c) 2, 1, 4, 3, 5
* d) 2, 3, 1, 4, 5
Answer – a
43⟩ A 110 V, centre-tapped earth, reduced low voltage supply for power tools provides a voltage of
* a) 25 V between live conductors
* b) 55 V to earth
* c) 110 V to earth
* d) 12 V SELV
Answer – b
44⟩ The five main stages of the risk assessment procedure are
* a) Identify
* b) Evaluate
* c) Record
* d) Implement
* e) Review
Answer – b
45⟩ A mass of 20 kg is to be raised by a hoist 2 m in 30 seconds. Assuming no losses, the power required to raise this load is
* a) 13.08 Watts
* b) 196.2 Watts
* c) 392.4 Watts
* d) 1200 Watts
Answer – a
46⟩ In order to understand the operating procedure for a particular item of equipment, the best source of information would be the
* a) Company sales representative
* b) Manufacturers’ manual
* c) Manufacturers’ catalogue
* d) Circuit diagram
Answer – b
47⟩ The white or grey PVC outer layer of a twin and CPC flat thermoplastic (PVC) cable is the
* a) conductor
* b) Insulation
* c) Conductor
* d) Sheath
Answer – d
48⟩ Where P = V I. The value V can be determined using
* a) V = _I_P
* b) V = P I
* c) V = P - I
* d) V = _P_I
Answer – d
49⟩ When carrying out maintenance work on a distribution board in a busy walkway, it is advisable to protect others by the use of a
* a) Warning sign
* b) Safety barrier
* c) Temporary bollard
* d) Audible warning device
Answer – b
50⟩ Four resistors having values of 2 O, 2 O, 5 O, and 20 O are connected in a parallel circuit arrangement. The total resistance of this circuit is
* a) 0.8 O
* b) 1.25 O
* c) 29 O
* d) 400 O
Answer – a
51⟩ A circuit wired in 1.5 mm2 thermoplastic (PVC) twin with CPC cable is protected by a 16 A device and is used to supply a 230 V 3 kW water heater. If the cable has a rated voltage drop of 29 mV/A/m and the circuit is 24 m long, the actual voltage drop will be
* a) 2.08V
* b) 9.07V
* c) 11.14V
* d) 69V
Answer – b
52⟩ A non-maintained emergency light is classified as NM3. This means that the luminary will illuminate during
* a) Normal conditions then automatically switch off after three hours
* b) Any power failure for up to three hours
* c) Both normal and power failure conditions then automatically switch off after three hours
* d) Power failures that last longer than three hours but not shorter than three hours
Answer – b
53⟩ An earthing arrangement that has a PEN conductor is
* a) TN-C-S
* b) TN-S
* c) TT
* d) IT
Answer – a
54⟩ A residual current device will disconnect under
* a) short circuit conditions only
* b) Both earth fault and short circuit conditions
* c) Earth fault conditions only
* d) Overload conditions only
Answer – c
55⟩ The most suitable item of equipment to mark a straight line in order to install a horizontal conduit over a distance of 4 m is a
* a) Plumb line
* b) Spirit level
* c) Steel tape
* d) Chalk line
Answer – d
56⟩ A 50 mm x 50 mm steel trunking has a tabulated space factor of 1037. If the tabulated factor for PVC cable having a cross sectional area of 6 mm2 is 21.2, the maximum number of these cables that can be installed into the trunking is
* a) 47
* b) 48
* c) 49
* d) 50
Answer – b
57⟩ The four electrical tests that should be carried out on a new ring final circuit before it is energized are
* a) Continuity of protective conductors, continuity of ring final circuits, insulation, - resistance and polarity
* b) Continuity of ring final circuits, insulation resistance, polarity, and earth fault loop - impedance
* c) Insulation resistance, polarity, earth fault loop impedance and continuity of protective - conductors
* d) Polarity, earth fault loop-impedance, continuity of protective conductors and Continuity of ring final circuits
Answer – a
58⟩ Certain discharge luminaries mounted above rotating machine can give the appearance that the machine is at a standstill. This effect is known as
* a) Stroboscopic effect
* b) Robotic effect
* c) Rotor effect
* d) Telescopic effect
Answer – a
59⟩ The Electricity at Work Regulations state that electrical equipment must be maintained to prevent danger. Electrical equipment is defined as all small items of battery-powered equipment up to and including overhead power lines rated at
* a) 230V
* b) 400V
* c) 33kV
* d) 400kV
Answer – d
60⟩ In order to prevent danger during maintenance operations, a voltage warning notice is required on all electrical accessories where
* a) Voltage is present
* b) The voltage exceeds 230V and such voltage would not be expected
* c) The voltage exceeds 400V
* d) The voltage is below 230V
Answer – b
