1. The main purpose of an electrical drawing is to:
(A) Show mechanical layout
(B) Represent electrical connections
(C) Display architectural design
(D) Indicate plumbing system
2. The symbol of a resistor in an electrical drawing is represented by:
(A) A circle
(B) A triangle
(C) A zigzag line
(D) A rectangle
3. The standard symbol for a switch is:
(A) Two dots connected by a line break
(B) Circle with a cross
(C) Square box
(D) Straight line
4. The abbreviation “SPST” stands for:
(A) Single Pole Single Throw
(B) Single Phase Single Transformer
(C) Simple Power Supply Transformer
(D) Single Point Switch Type
5. The standard drawing sheet size for industrial electrical diagrams is usually:
(A) A2
(B) A4
(C) A3
(D) A1
6. In wiring diagrams, a thick line usually represents:
(A) High-voltage cable
(B) Ground wire
(C) Conduit
(D) Main power line
7. The symbol for a lamp in an electrical drawing is:
(A) Circle with a cross inside
(B) Rectangle
(C) Triangle
(D) Circle with dot
8. Electrical symbols are standardized by:
(A) ISO
(B) IEEE
(C) IEC
(D) NEC
9. A wiring diagram shows:
(A) Physical location of equipment
(B) Internal structure of devices
(C) Actual wire connections
(D) Only voltage levels
10. The abbreviation “DPDT” means:
(A) Double Pole Double Throw
(B) Dual Point Double Transformer
(C) Direct Power Distribution Transformer
(D) Double Phase Direct Terminal
11. Which type of drawing shows the physical location of components?
(A) Schematic diagram
(B) Wiring diagram
(C) Single-line diagram
(D) Layout diagram
12. A single-line diagram is used to:
(A) Simplify the representation of a complex circuit
(B) Show detailed wiring
(C) Indicate component ratings
(D) Design electronic circuits
13. The earth or ground is represented by:
(A) A square
(B) A circle
(C) A triangle
(D) Three horizontal lines
14. The line used for showing hidden wiring is usually:
(A) Continuous thick line
(B) Dotted line
(C) Chain line
(D) Thin solid line
15. The abbreviation “SPDT” refers to:
(A) Simple Phase Double Transformer
(B) Single Power Distribution Transformer
(C) Single Pole Double Throw
(D) Secondary Power Double Terminal
16. The symbol for a transformer consists of:
(A) Two straight lines
(B) Two coils with magnetic core
(C) A rectangle with arrows
(D) Circle and a line
17. Which drawing is used for installation at site?
(A) Schematic drawing
(B) Wiring diagram
(C) Circuit drawing
(D) Layout drawing
18. The abbreviation “NC” in a switch means:
(A) Normally Closed
(B) Normally Connected
(C) Neutral Current
(D) Not Connected
19. The abbreviation “NO” in switch drawing means:
(A) Normal Operation
(B) Not Operational
(C) Negative Output
(D) Normally Open
20. The component symbol that has two parallel lines represents:
(A) Capacitor
(B) Inductor
(C) Resistor
(D) Transformer
21. The schematic diagram is mainly used for:
(A) Component rating details
(B) Installation purpose
(C) Understanding working of a circuit
(D) Physical layout
22. In an electrical diagram, the neutral wire is often shown as:
(A) Red line
(B) Blue line
(C) Green line
(D) Yellow line
23. The phase wire is represented by which color?
(A) White
(B) Blue
(C) Green
(D) Red or brown
24. The protective earth (PE) wire is usually:
(A) Green or yellow
(B) Red
(C) Blue
(D) White
25. The abbreviation “CB” in an electrical drawing stands for:
(A) Control Base
(B) Current Box
(C) Circuit Breaker
(D) Cable Board
26. A contactor is represented in a circuit diagram by:
(A) Switch only
(B) Battery symbol
(C) Lamp symbol
(D) Coil and contacts
27. The term “legend” in a drawing refers to:
(A) The main circuit diagram
(B) The list of symbols and their meanings
(C) The load distribution chart
(D) The drawing title
28. The title block of an electrical drawing includes:
(A) Drawing title, scale, and date
(B) Circuit details only
(C) Component values
(D) Schematic legend
29. The type of line used for dimensioning is:
(A) Dashed line
(B) Thick line
(C) Zigzag line
(D) Thin continuous line
30. The abbreviation “MCC” stands for:
(A) Main Current Cable
(B) Machine Control Circuit
(C) Motor Control Center
(D) Motor Current Controller
31. Which of the following is used to connect circuit elements in diagrams?
(A) Arrows
(B) Straight lines
(C) Symbols
(D) Dotted lines
32. The main advantage of schematic diagrams is:
(A) Easier installation
(B) Easier understanding of circuit function
(C) Load distribution
(D) Mechanical layout
33. The abbreviation “L” in an electrical drawing indicates:
(A) Line conductor
(B) Load wire
(C) Loop wire
(D) Live wire
34. The abbreviation “N” in an electrical drawing indicates:
(A) Neutral wire
(B) Negative terminal
(C) Normal contact
(D) Non-conductor
35. The wiring diagram for lighting circuits generally includes:
(A) Relays only
(B) Transformers only
(C) Motors only
(D) Switches, lamps, and supply
36. The abbreviation “TS” in an electrical drawing stands for:
(A) Terminal Screw
(B) Test Signal
(C) Time Sequence
(D) Toggle Switch
37. A push button switch is shown as:
(A) Circle with an arrow
(B) Circle with line through it
(C) Circle with a break in contact
(D) Circle with dot
38. The wiring plan of a building is made during:
(A) Electrical design stage
(B) Construction stage
(C) Testing stage
(D) Maintenance stage
39. A line diagram is also called a:
(A) Single-line diagram
(B) Wiring diagram
(C) Layout plan
(D) Pictorial diagram
40. The graphical representation of electrical equipment is called:
(A) Connection
(B) Layout
(C) Schematic
(D) Symbol
41. The abbreviation “PB” refers to:
(A) Power Bus
(B) Push Button
(C) Plug Box
(D) Phase Breaker
42. A relay symbol usually contains:
(A) Capacitor
(B) Resistor
(C) Coil and movable contacts
(D) Switch only
43. Which drawing is used to show power distribution?
(A) Single-line diagram
(B) Layout diagram
(C) Wiring diagram
(D) Circuit diagram
44. The abbreviation “SW” in an electrical drawing stands for:
(A) Solid Wire
(B) Software
(C) Side Wiring
(D) Switch
45. Electrical symbols are drawn using:
(A) Brushes
(B) Free hand
(C) Drawing instruments
(D) 3D modeling
46. The purpose of a fuse in an electrical drawing is to:
(A) Control current direction
(B) Step down voltage
(C) Store energy
(D) Protect circuit from overload
47. The abbreviation “LT” stands for:
(A) Low Tension
(B) Long Transmission
(C) Line Transformer
(D) Load Terminal
48. The abbreviation “HT” stands for:
(A) High Transformer
(B) High Tension
(C) Heavy Transmission
(D) High Terminal
49. A wiring diagram is mainly used by:
(A) Architects for planning
(B) Engineers for design
(C) Electricians for installation
(D) Managers for costing
50. The electrical drawing that shows control circuits for motors is called:
(A) Control circuit diagram
(B) Power diagram
(C) Layout drawing
(D) Lighting plan