Electrical Technician Mock Test
Interview Chamber 1. What electrical component is used to protect sensitive electronic circuits from voltage spikes and surges?
A) Fuse
B) Resistor
C) Surge protector
D) Transformer
Correct Answer
Wrong Answer
2. In electrical equipment maintenance, what is the primary purpose of insulation resistance testing?
A) To measure voltage levels
B) To determine current flow
C) To check for loose connections
D) To detect insulation degradation or faults
Correct Answer
Wrong Answer
3. When working in wet or damp conditions, what type of electrical equipment should be used?
A) Grounded equipment
B) Non-insulated equipment
C) Damaged equipment
D) High-voltage equipment
Correct Answer
Wrong Answer
4. What is the purpose of electrical grounding in electrical safety?
A) To create an electrical circuit
B) To increase voltage levels
C) To provide a safe path for electrical faults to earth
D) To reduce electrical resistance
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Wrong Answer
5. If a motor fails to start, what should be checked first during troubleshooting?
A) The power supply
B) The speed setting
C) The voltage rating of the motor
D) The color of the motor wires
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Wrong Answer
6. Which tool is commonly used to safely remove electrical wires from terminal blocks or connectors?
A) Wire cutter
B) Screwdriver
C) Needle-nose pliers
D) Wire stripping tool
Correct Answer
Wrong Answer
7. What is the role of a substation in the electrical distribution network?
A) To generate electricity
B) To distribute electricity to homes
C) To step up or step down voltage levels
C) To step up or step down voltage levels
Correct Answer
Wrong Answer
8. What tool is used to test the continuity of a circuit and check for open or broken connections?
A) Voltmeter
B) Ammeter
C) Continuity tester
D) Oscilloscope
Correct Answer
Wrong Answer
9. Which type of electrical installation is typically governed by specialized electrical codes and standards?
A) Residential
B) Commercial
C) Industrial
D) All of these
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10. Which electrical equipment maintenance task involves inspecting and cleaning air filters to ensure proper ventilation?
A) Grounding inspection
B) Dusting and cleaning
C) Insulation resistance testing
D) Lubrication
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11. What type of electrical component allows current to flow in one direction only?
A) Resistor
B) Capacitor
C) Diode
D) Transformer
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Wrong Answer
12. What does the term "grounding" refer to in electrical wiring?
A) Connecting to a power source
B) Creating a path for fault current to earth
C) Reducing electrical resistance
D) Adding more wires to a circuit
Correct Answer
Wrong Answer
13. Which component is known for its ability to resist the flow of electrical current?
A) Capacitor
B) Inductor
C) Resistor
D) Transistor
Correct Answer
Wrong Answer
14. What is the standard voltage for household electrical outlets in Tanzania?
A) 120 volts
B) 220–240 volts
C) 480 volts
D) 600 volts
Correct Answer
Wrong Answer
15. Which color is typically used for a neutral wire in Tanzanian electrical systems?
A) Red
B) Green
C) Blue or black
D) White or gray
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Wrong Answer
16. What type of electrical component is used to smooth out voltage variations in a circuit?
A) Capacitor
B) Diode
C) Transistor
D) Resistor
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Wrong Answer
17. What is the purpose of a circuit diagram or schematic in electrical design?
A) To show the physical layout of components
B) To illustrate the color-coding of wires
C) To depict how components are connected and function
D) To provide instructions for circuit assembly
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Wrong Answer
18. What is the primary function of a relay in an electrical circuit?
A) To amplify signals
B) To regulate voltage
C) To switch high currents using a small control current
D) To store energy
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19. Which type of connection is commonly used to connect devices in parallel?
A) Series connection
B) Parallel connection
C) Ground connection
D) Cross-connection
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20. Which PPE is necessary to protect the head from falling objects?
A) Face shield
B) Hard hat
C) Welding helmet
D) Safety goggles
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21. In AC circuits, what does "AC" stand for?
A) Alternating Current
B) Always Charged
C) Amplified Circuit
D) Active Connection
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22. In a parallel circuit, total resistance is:
A) Greater than individual resistance
B) Less than any individual resistance
C) Equal to the sum of resistances
D) Equal to reciprocal of resistances
Correct Answer
Wrong Answer
23. In a parallel circuit, how do the voltage levels across each branch compare?
A) They are all the same
B) They add up to total voltage
C) They subtract from total voltage
D) They are inversely proportional
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Wrong Answer
24. Purpose of a continuity test in repairs is:
A) To measure voltage
B) To check for open or broken connections
C) To regulate current flow
D) To test resistance
Correct Answer
Wrong Answer
25. Which component controls flow and can act as a switch or amplifier?
A) Capacitor
B) Diode
C) Transistor
D) Fuse
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26. What does a distribution feeder do in power systems?
A) Generate electricity
B) Step up voltage
C) Transmit power long distance
D) Distribute power locally
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27. Which device varies electric motor speed?
A) Relay
B) Thermostat
C) Variable Frequency Drive (VFD)
D) Push button
Correct Answer
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28. Which panel is common in Tanzanian residential buildings?
A) Main panel
B) Subpanel
C) Substation
D) Control panel
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29. “Load center” refers to:
A) Emergency supply
B) Main electrical panel
C) Industrial automation panel
D) Lighting control unit
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30. Why isolate equipment before maintenance?
A) To increase energy
B) To ensure stable supply
C) To prevent shock
D) To reduce time
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31. Why tag and lock out equipment?
A) To identify equipment
B) To keep away people
C) To prevent accidental energization
D) To make it official
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32. What is the purpose of a fuse or circuit breaker?
A) Control current direction
B) Increase resistance
C) Prevent overcurrent damage
D) Generate power
Correct Answer
Wrong Answer
33. What is the function of electrical safety permits at worksites?
A) Dress code compliance
B) Equipment tracking
C) Authorize/control electrical work
D) Schedule breaks
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34. What is “load shedding” in Tanzania?
A) Distribute load evenly
B) Reduce voltage
C) Disconnect non-essential loads
D) Increase current flow
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35. Why wear electrical-rated gloves?
A) Warmth
B) Dexterity
C) Prevent electric shock
D) Better grip
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36. What controls fans/pumps based on temperature?
A) Toggle switch
B) Pressure switch
C) Thermostat
D) Rotary switch
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37. Most important safety precaution with equipment?
A) Goggles
B) Non-conductive tools
C) Wear PPE
D) Wet hands
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38. Purpose of conduit in wiring (per codes)?
A) Increase resistance
B) Reduce current
C) Protect and encase wiring
D) Regulate voltage
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39. In a series circuit with 3 resistors, total resistance is:
A) Greater than any one
B) Less than any one
C) Equal to sum
D) Reciprocal of sum
Correct Answer
Wrong Answer
40. Most used grounding conductor material in Tanzania?
A) Aluminum
B) Copper
C) Steel
D) PVC
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41. Which component controls flow and can switch?
A) Resistor
B) Capacitor
C) Diode
D) Transistor
Correct Answer
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42. What does an inductor do in an AC circuit?
A) Store energy
B) Block DC
C) Provide low-resistance path
D) Oppose changes in current
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43. Why lubricate moving parts in maintenance?
A) Increase resistance
B) Reduce energy use
C) Prevent corrosion
D) Improve efficiency
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44. When should flame-resistant (FR) clothing be worn?
A) Only in winter
B) Only with chemicals
C) When risk of arc flash or fire
D) Only during testing
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45. Purpose of a fuse in a circuit?
A) Regulate voltage
B) Increase current
C) Prevent overcurrent
D) Amplify signal
Correct Answer
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46. SI unit of electric current is:
A) Joule
B) Ohm
C) Ampere
D) Coulomb
Correct Answer
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47. First step when troubleshooting a circuit?
A) Replace components
B) Measure voltage
C) Disassemble
D) Turn off power
Correct Answer
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48. What is the residential voltage in Tanzania?
A) 120 volts
B) 220–240 volts
C) 480 volts
D) 600 volts
Correct Answer
Wrong Answer
49. Which stores energy in a circuit?
A) Resistor
B) Capacitor
C) Inductor
D) Diode
Correct Answer
Wrong Answer
50. Function of disconnect switch in panel?
A) Protect against surges
B) Remote control
C) Isolate circuit for safety
D) Measure current
