1. The first step in electrical installation work is:
(A) Load estimation
(B) Wiring layout design
(C) Site inspection
(D) Material purchasing
2. The main objective of electrical installation planning is to:
(A) Reduce cost and ensure safety
(B) Increase consumption
(C) Avoid drawings
(D) Minimize load
3. The term “IE Rules” stands for:
(A) Indian Electricity Rules
(B) Internal Electrical Rules
(C) Industrial Engineering Rules
(D) Installation Estimation Rules
4. The load of an electrical installation is expressed in:
(A) Amperes
(B) Watts or kilowatts
(C) Volts
(D) Ohms
5. The electrical plan of a building shows:
(A) Ceiling design
(B) Foundation plan
(C) Furniture layout
(D) Wiring layout and switchboard position
6. The diversity factor is always:
(A) Equal to 1
(B) Greater than 1
(C) Less than 1
(D) Zero
7. The demand factor is defined as:
(A) Maximum demand / Connected load
(B) Connected load / Maximum demand
(C) Total load / Connected load
(D) Load factor / Demand factor
8. The permissible voltage drop in lighting circuits should not exceed:
(A) 3%
(B) 5%
(C) 2%
(D) 10%
9. The type of wiring most suitable for temporary installations is:
(A) Conduit wiring
(B) Casing capping
(C) Cleat wiring
(D) Batten wiring
10. In domestic wiring, the most commonly used system is:
(A) Single-phase AC system
(B) Three-phase AC system
(C) DC system
(D) Two-phase system
11. The quantity of materials for estimation is calculated from:
(A) Load chart only
(B) Floor plan only
(C) Ceiling plan
(D) Electrical drawings
12. The point wiring estimate is based on:
(A) Number of points
(B) Load of each circuit
(C) Total wiring length
(D) Type of switches
13. Earthing is provided to:
(A) Improve efficiency
(B) Increase voltage
(C) Protect human life and equipment
(D) Increase resistance
14. The standard voltage for domestic supply in Pakistan is:
(A) 400 V
(B) 110 V
(C) 230 V
(D) 500 V
15. The standard frequency of AC supply in Pakistan is:
(A) 50 Hz
(B) 60 Hz
(C) 45 Hz
(D) 25 Hz
16. The term “schedule of material” means:
(A) List of all required materials with quantity
(B) Labour schedule
(C) Time schedule
(D) Installation order
17. The connected load is the:
(A) Load consumed at one time
(B) Average load used
(C) Total load of all equipment connected
(D) Load factor
18. A sub-circuit should not exceed a load of:
(A) 800 watts
(B) 1000 watts
(C) 1500 watts
(D) 3000 watts
19. For lighting, the maximum number of points in a circuit is:
(A) 10
(B) 5
(C) 8
(D) 12
20. The maximum load of a power circuit is:
(A) 1500 W
(B) 1000 W
(C) 500 W
(D) 3000 W
21. The unit of energy consumed in billing is:
(A) Kilowatt-hour (kWh)
(B) Joule
(C) Watt-second
(D) Megajoule
22. The neutral wire is always:
(A) Used for earthing
(B) At high potential
(C) At or near earth potential
(D) Current-free
23. The most accurate method of electrical estimation is:
(A) Quick estimate
(B) Rough estimate
(C) Approximate estimate
(D) Detailed estimate
24. A typical domestic wiring system includes:
(A) Only power circuits
(B) Only lighting circuits
(C) Lighting and power circuits
(D) Control circuits only
25. The total cost of installation includes:
(A) Material + Labour + Overhead charges
(B) Only material cost
(C) Labour cost only
(D) Miscellaneous charges only
26. Labour cost is generally taken as:
(A) 5% of material cost
(B) 50% of material cost
(C) 10–20% of material cost
(D) 100% of material cost
27. The over-head charges are taken as:
(A) 10% of total cost
(B) 25% of total cost
(C) 5% of total cost
(D) 50% of total cost
28. The rate per point method is used in:
(A) Substation estimation
(B) Transmission line work
(C) Small wiring installations
(D) Industrial plants
29. The wiring diagram shows:
(A) Physical location of electrical components
(B) Only ratings of components
(C) Load current
(D) Cable size
30. A load factor of 0.8 means:
(A) Voltage is reduced by 20%
(B) Efficiency is 80%
(C) Demand is 80% of load
(D) Load used is 80% of maximum demand
31. The type of wiring used in industries is usually:
(A) Conduit wiring
(B) Cleat wiring
(C) Casing-capping wiring
(D) Batten wiring
32. For three-phase supply, the number of conductors required are:
(A) 4
(B) 3
(C) 2
(D) 5
33. The current-carrying capacity of a wire depends on:
(A) Length of wire
(B) Cross-sectional area
(C) Color of insulation
(D) Type of switch used
34. In estimating work, wastage of material is generally taken as:
(A) 5%
(B) 10%
(C) 15%
(D) 2%
35. The main function of a distribution board is to:
(A) Distribute electrical energy to sub-circuits
(B) Store electricity
(C) Step down voltage
(D) Protect cables only
36. The ISI symbol on electrical materials means:
(A) Imported product
(B) Product made in India
(C) Product meets safety standards
(D) Low-cost item
37. The supply to a building is given through:
(A) Service main
(B) Substation
(C) Transmission line
(D) Switchboard
38. The size of the main switch depends upon:
(A) Total load of installation
(B) Number of lights
(C) Size of fuses
(D) Building height
39. The cost of electrical installation for residential buildings is generally:
(A) 25%
(B) 1–3%
(C) 15–20%
(D) 8–12% of total building cost
40. In industrial wiring, the most important factor is:
(A) Safety and durability
(B) Color of wire
(C) Interior design
(D) Aesthetic look
41. The standard size of conduit used in domestic wiring is:
(A) 40 mm
(B) 10 mm
(C) 19 mm
(D) 60 mm
42. For estimation, the area of a building is calculated in:
(A) Cubic meters
(B) Square meters
(C) Linear meters
(D) Kilometers
43. The cost of earthing set is generally included under:
(A) Material charges
(B) Labour charges
(C) Overhead charges
(D) Miscellaneous charges
44. The main switch is always installed:
(A) Near the main entrance
(B) Inside the bedroom
(C) Near the ceiling
(D) In the kitchen
45. The length of wire for estimation is increased by:
(A) 5%
(B) 50%
(C) 25%
(D) 10% for wastage and connections
46. The lighting load per square meter in a residential building is about:
(A) 20 W/m²
(B) 100 W/m²
(C) 2 W/m²
(D) 10 W/m²
47. The cable size depends on:
(A) Current carrying capacity
(B) Voltage rating
(C) Length of run
(D) All of these
48. The total connected load is used to determine:
(A) Rating of main switch and wires
(B) Color of insulation
(C) Circuit layout only
(D) Building cost
49. The supply from distribution board to sub-circuit is given through:
(A) Isolator
(B) Fuse or MCB
(C) Transformer
(D) Neutral link
50. The final step in electrical installation planning is:
(A) Testing and commissioning
(B) Estimation
(C) Material ordering
(D) Drawing preparation