61⟩ Once a low-pressure mercury vapour lamp has lit, the purpose of the choke/ballast unit is to
* a) Discharge voltage
* b) Correct power factor
* c) Suppress radio interference
* d) Limit lamp current
Answer – d
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105 Electrical Engineering Questions And Answers
62⟩ Balancing loads over three phases will reduce
* a) Phase currents
* b) Earth faults
* c) Neutral currents
* d) Overloads
Answer – c
63⟩ In order to facilitate maintenance of a complex electrical system, the sequence of control for isolation can be best shown using a
* a) Block diagram
* b) Layout drawing
* c) Circuit diagram
* d) Bar chart
Answer – a
64⟩ Which of the following normally form part of a highway electrical system?
* a) Current transformers and photoelectrical control units
* b) Voltage transformers and RCD’s
* c) Igniters and transformers
* d) Power factor meter and isolators
Answer – c
65⟩ Which of the following is a statutory document applicable to operatives carrying out installation and maintenance of highway electrical equipment?
* a) The Laying of Cables in Public Highways
* b) H.S.E guidance H.S.G 47 (Avoiding danger from underground and overhead services)
* c) The Personal Protective Equipment at Work Regulations
* d) Electricity Association G39/1
Answer – c
66⟩ Low-pressure mercury- vapor lamps should be disposed of by
* a) Throwing in a skip
* b) Putting in a glass recycle point (clear glass only)
* c) Using a suitable lamp crusher
* d) Putting in the refuse bins, which are collected weekly?
Answer – c
67⟩ Which of the following is a non-statutory document?
* a) The New Roads and Street Works Act
* b) The Electricity Safety, Quality, and Continuity Regulations 2002
* c) BS 7671
* d) The Electrical Equipment (Safety) Regulations
Answer – c
68⟩ It is necessary to avoid skin contact with quartz lamps, as it
* a) Reduces the life of the lamp
* b) Could cause burns
* c) Generates excessive heat
* d) Lengthens lampworking life
Answer – a
69⟩ Guidance on regular inspection and testing of portable appliances can be found in
* a) BS 7671 Requirements for Electrical Installation
* b) IEE Guidance Note 3 Inspection and testing
* c) IEE Code of Practice for In-Service Inspection and Testing of Electrical Equipment
* d) IEE on Site Guide
Answer – c
70⟩ A moving coil meter is not used on an ac circuit because
* a) It cannot read very small variations
* b) The direction of the deflection depends upon the direction of the current
* c) It is non linear
* d) It does not use the damping effect
Answer – b
71⟩ The purpose of a switch is to open or close a circuit
* a) In the event of a fault current
* b) Under load conditions
* c) Under overload conditions
* d) Automatically after a fault has been repaired
Answer – b
72⟩ To ensure safe isolation, voltage indicating devices
* a) Must comply with BS 7671
* b) Are used to prove the circuit dead only
* c) Are used to prove the circuit was alive only
* d) Must be “proved” prior to and “re-proved” after isolation
Answer – d
73⟩ A common type of cable termination used for ribbon cables in panel building is
* a) Pin
* b) Lug
* c) Insulation displacement
* d) Screw
Answer – c
74⟩ Which of the following has an adverse effect on installed equipment?
* a) Eddy current damping
* b) Air damping
* c) Ambient temperature
* d) Operating temperature
Answer – c
75⟩ The purpose of a visual inspection is to ensure compliance with BS 7671, Section
* a) 601
* b) 712
* c) 413
* d) 314
Answer – b
76⟩ Electrostatic sensitive equipment, in transit, need not be protected against damage from
* a) High temperature
* b) Dust and fibers
* c) Moisture ingress
* d) Day light
Answer – d
77⟩ Which of the following has an impact upon earthing?
* a) BS EN 60439-01
* b) BS 4491
* c) BS 4444
* d) BS EN 60898
Answer – c
78⟩ When a voltmeter is connected in a circuit it is essential that it
* a) Has a very low resistance
* b) Has a very high resistance
* c) Is connected in series with the supply
* d) Is connected in series with the load
Answer – b
79⟩ Which of the following is not a factor, which would affect the type of termination?
* a) Circuit design current
* b) Physical space around terminations
* c) Presence of solid foreign bodies
* d) Size of conductor
Answer – c
80⟩ To facilitate ease of installation and assembly of equipment reference is made to
* a) BS 7430
* b) Manufacturer’s catalogues
* c) GS 38
* d) Data charts
Answer – d
