Basic wiring practice
Electrician Trade Theory, Module-8
Basic wiring practice
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Q1: How the conduit pipes are specified?
- Length in metre
- Wall thickness in mm
- Inner diameter in mm
- Outer diameter in mm
Q2: What is the fusing factor for rewireable fuse?
- 1.1
- 1.4
- 2.1
- 2.5
Q3: What is the purpose of underwriter's knot for pendent holder connection?
- Avoid loose connections
- Increase mechanical strength
- Prevent excessive cap cover pressure
- Reduce the strain from the terminals of accessories
Q4: What is the type of fuse?
- Knife edge cartridge fuse
- High rupturing capacity fuse
- Ferrule contact cartridge fuse
- Diazed screw type cartridge fuse
Q5: What is the name of electrical accessory?
- Bracket holder
- Edison screw type holder
- Angle swivel lamp holder
- Goliath Edison screw lamp holder
Q6: What is the name of symbol used in wiring circuit?
- Link
- Fuse
- Pull switch
- Plug and socket
Q7: Which type of load is protected by the L-series MCB?
- Motors
- Geyser
- Hand tools
- Air conditioner
Q8: Which type of switch is used in the circuit?
- One way switch
- Two way switch
- Intermediate switch
- Multiposition switch
Q9: What is the effect of low current rated cable used to connect higher current load?
- Voltage drop increases
- Load current increases
- Voltage drop decreases
- Cable damage due to heat
Q10: What is the name of the conduit accessory?
- Solid bend
- Solid elbow
- Inspection Bend
- Inspection elbow
Q11: How many two way switches with intermediate switch are used to control one lamp from three different places?
- 1
- 2
- 3
- 4
Q12: What is the advantage of concealed wiring?
- Easy to maintain
- Less voltage drop
- High insulation resistance
- Protection against moisture
Q13: What is the fusing factor for high rupturing capacity fuses (HRC)?
- 1.0
- 1.1
- 1.4
- 1.7
Q14: Which type of relay can be operated at both A.C and D.C?
- Ferred relay
- Thermal relay
- Impulse relay
- Dry reed relay
Q15: What is the name of the accessory used in electrical appliances?
- 2 Pin plug
- Three pin plug
- Iron connector with direct entry
- Flat connector with side entry
Q16: What is the name of the accessory symbol?
- Bell push switch
- Two way switch
- One way switch two poles
- Multi position switch single pole
Q17: What is the purpose of the flexible cords in domestic wiring?
- Concealed wiring
- Permanent connection
- Run cable through holes in ceiling
- Connection transportable appliances
Q18: Which type of circuit breaker is used above 100 A current rating?
- Miniature Circuit Breaker (MCB)
- Earth Leakage Circuit Breaker (ELCB)
- Moulded Case Circuit Breaker (MCCB)
- Residual Current Circuit Breaker (RCCB)
Q19: What is the purpose of tin coating on copper fuse wire?
- Withstand high temperature
- Increase the fusing factor
- Prevent oxidation of copper wire
- Increase the mechanical strength
Q20: What is the name of the four insulated conductors group?
- Pair
- Core
- Quad
- Layer
Q21: How many two way switches are required in godown wiring circuit to control four lamps?
- 2
- 3
- 4
- 5
Q22: Why tree system of wiring most suitable for multistoried building?
- Easy load balancing
- Constant voltage distribution
- Offers minimum voltage drop
- Easy in fault finding with many fuses
Q23: Which is used as a filler material for fixing screw hole on ceiling?
- Paper
- Nylon
- Cement
- Poly vinyl chloride
Q24: What is the symbol indicates?
- Table fan
- Ceiling fan
- Bracket fan
- Exhaust fan
Q25: What is the name of the relay?
- Impulse relay
- Dry reed relay
- Electromagnetic relay
- Mercury wetted contact relay
Q26: What is the name of the diagram?
- Layout plan
- Wiring diagram
- Installation plan
- Schematic diagram
Q27: Where the Iron Clad Double Pole (ICDP) main switch is used?
- Large industrial installations
- Control main or branch circuits
- Single phase domestic installations
- Three phase power circuit installations
Q28: Which electrical accessory belongs to general classification of accessories?
- Fuse
- Ceiling roses
- Intermediate switch
- Pendent lamp holder
Q29: Which is the application of DC series MCB?
- AC motor
- DC motor
- Locomotives
- Air conditioners
Q30: What is the term for the time taken by a fuse to interrupt the circuit in fault?
- Time factor
- Fusing factor
- Cut-off factor
- Fusing current
Q31: Which place the Tree system of wiring is most suitable?
- Godown wiring
- Industrial wiring
- Domestic wiring.
- Multi storied building
Q32: What is the maximum PVC conduit size to make safe cold bending?
- 12 mm
- 19 mm
- 25 mm
- 50 mm
Q33: Why separate wiring is recommended for home theatre wiring and power wiring?
- Avoid electrical fire
- Reduce power loss
- Avoid electrical interference
- Maintain voltage level constant
Q34: What is the name of the lighting circuit?
- Tunnel lighting wiring
- Corridor lighting wiring
- Godown lighting wiring
- Staircase lighting: wiring
Q35: What is the tool used to bend conduits?
- Hickey
- Coupler
- Pipe vice
- Bench vice
Q36: What is the expansion of MCB?
- Minute Control Breakerl
- Miniature Circuit Breaker
- Minimum Current Breaker
- Maximum Current Breaker
Q37: What is the purpose of ELCB?
- Detects the fault in circuit
- Monitors the residual current
- Protects the equipment from over load
- Protects from short circuit fault
Q38: What is the purpose of the fuse cut out provided at the incoming power supply?
- To ensure the line is not over loaded
- To maintain the stabilised supply voltage
- To protect the circuit from the leakage current
- To protect the human beings from electric shock
Q39: What is the use of die stock set?
- Cut external threads on square pipe
- Cut internal threads on cylindrical pipe
- Cut external threads on cylindrical pipe
- Cut internal threads on rectangular pipe
Q40: Which classification of accessory the ceiling rose is classified?
- Outlet accessories
- Safety accessories
- Holding accessories
- General accessories
Q41: What is the purpose of the circuit diagram in wiring installation?
- To show the physical position of accessories
- To estimate the various accessories in the circuit
- To inform the reader quickly what for the circuit is designed
- To show the schematic connection of the circuit for a specific task
Q42: Which electrical equipment is provided with 'L' series MCB?
- General lighting
- Motors
- Air conditioner
- Halogen lamp
Q43: Why the looping-back (loop in) method is preferred in domestic wiring installation?
- Easy to identify the faults
- No separate joints are used
- More number of tappings can be taken
- More number of sub-circuits can be made
Q44: What does the symbol marked 'X' indicate?
- Number of wires run on the limb
- Number of switches to be connected
- Number of battern (or) pipe to be fixed
- Number of clamps (or) clips to be fixed
Q45: What is the name of wiring method?
- Joint box method
- Looping back method
- Loop in method using 3 plate ceiling rose
- Loop in method using 2 plate ceiling rose
Q46: What is the name of the wiring?
- Staircase wiring
- Godown wiring
- Hostel wiring
- Tunnel wiring
Q47: What is the type of relay?
- Impulse relay
- Dry reed relay
- Latching relay
- Electromagnetic relay
Q48: Calculate the earth fault loop impedance, if the ELCB tripping current is 30 mA?
- 1662
- 16662
- 16.66 Ω
- 16666(2
Q49: What is the type of wiring?
- CTS wiring
- Cleat wiring
- PVC conduit wiring
- PVC casing and capping wiring
Q50: What is length of thread on rigid conduits as per BIS?
- 9mm 20mm.
- 11mm-27mm
- 13mm 25mm
- 15mm-30mm
Q51: Which type of conduit used for gas tight explosive installation?
- Flexible conduits
- Rigid steel conduits
- Rigid non-metallic conduits
- Flexible non-metallic conduits
Q52: What is the function of circuit breaker?
- Making contact at normal condition
- Making contact at abnormal condition
- Breaking automatically at abnormal condition
- Physical breaking contact at abnormal condition
Q53: What is the function of bimetallic strip in MCB?
- Over load protection
- Short circuit protection
- Over voltage protection
- Earth leakage protection
Q54: What protection offered by residual current circuit breaker?
- Protection from shock
- Protection from over load
- Protection from short circuit
- Protection from leakage current
Q55: Which wiring is suitable for temporary installations?
- Cleat wiring
- Concealed wiring
- PVC conduit wiring
- Metal conduit wiring
Q56: Where the phase conductor is looped in looping system of wiring?
- Switch box
- Junction box
- Distribution box
- Socket connection
Q57: How many link clips are packed in cardboard boxes as per BIS rules?
- 50 clips
- 75 clips
- 100 clips
- 150 clips
Q58: What is the application of the wiring circuit?
- Two lamps dim operation only
- Two lamps controlled by one switch
- Two lamps controlled by two switches
- One lamp bright and two lamp dim operation
Q59: What is the reason for home theatre wiring not to run along with power wiring?
- Avoid leakage current in home theatre wiring
- Control temperature in home theatre wiring
- Avoid electrical interference in audio, video system
- Reduce the power consumption in power supplies
Q60: What will happen to the value of earth resistance if length of the earth pipe is increased?
- Remain same
- Increases
- Decreases
- Infinity
Q61: Which types of accessories are used to operate a portable appliance?
- Safety accessories
- Holding accessories
- Outlet accessories
- Controlling accessories
Q62: Which insulation is necessary for proper function and basic protection?
- Double insulation
- Functional insulation
- Reinforced insulation
- Supplementary insulation
Q63: Which type of accessories of fuse is comes under?
- Controlling accessories
- Holding accessories
- Safety accessories
- Outlet accessories
Q64: What is the expansion of ECC?
- Earth Conductor Continuity
- Earth Continuity Conductor
- Earth Carrying Conductor
- Earth Continuity Cable
Q65: Which type MCBs suitable for halogen lamps?
- L' series MCBS
- 'G' series MCBS
- 'DC' series MCBS
- "L and 'G' series MCBS
Q66: Which type of lamp holder is used for the lamps above 300 watts?
- Edison screw holder
- Goliath screw holder
- Angle holder
- Brachet holder
Q67: What is the expansion of AWG?
- American Wire Gauge
- American Wire Grade
- American Wire Group
- American Wire Guard
Q68: What is the name of BIS symbal?
- Lamp
- Two way switch
- Intermediate switch
- Multi-position switch
Q69: What is the type of diagram?
- Wiring diagram
- Circuit diagram
- Installation plan
- Layout diagram
Q70: What is the minimum size of aluminium earth continuity conductor used in single phase domestic wiring as per BIS?
- 3.5 Sq.mm
- 3 Sq.mm
- 2.5 Sq.mm
- 1.5 Sq.mm
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