Basic Electrical Drawing MCQs β DAE Electrical Engineering 50 Score: 0 Attempted: 0/50 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 systemShow All Answers 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 βSPSTβ 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 βDPDTβ 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 βSPDTβ 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 βNCβ in a switch means: (A) Normally Closed (B) Normally Connected (C) Neutral Current (D) Not Connected 19. The abbreviation βNOβ 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 βCBβ 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 βlegendβ 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 βMCCβ 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 βLβ in an electrical drawing indicates: (A) Line conductor (B) Load wire (C) Loop wire (D) Live wire 34. The abbreviation βNβ 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 βTSβ 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 βPBβ 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 βSWβ 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 βLTβ stands for: (A) Low Tension (B) Long Transmission (C) Line Transformer (D) Load Terminal 48. The abbreviation βHTβ 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