CWEA ELECTRICAL /INSTRUMENTATION
TECHNOLOGIST GRADE 2 EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES Q&A 2026 |INSTANT DOWNLOAD
PDF
1. What is the main purpose of a current transformer (CT) in
an electrical system?
A. To step up voltage
B. To measure high currents safely
C. To step down current for protection devices
D. To store electrical energy
Rationale: CTs are used to safely measure or monitor high
currents by producing a proportional lower current.
Answer: B, C
2. Which instrument is commonly used to measure insulation
resistance of motors and cables?
A. Voltmeter
B. Megger
C. Clamp meter
D. Oscilloscope
Rationale: A megger applies a high DC voltage to measure
,insulation resistance.
Answer: B
3. In a 3-phase, 4-wire system, what is the phase voltage if the
line voltage is 415V?
A. 240V
B. 230V
C. 415V
D. 120V
Rationale: Phase voltage = Line voltage / √3 → .732 ≈
240V.
Answer: A
4. Which of the following are types of sensors used in process
instrumentation?
A. Temperature sensors
B. Pressure sensors
C. Level sensors
D. Memory chips
Rationale: Sensors detect physical variables like temperature,
pressure, and level.
Answer: A, B, C
5. What is the purpose of a Programmable Logic Controller
(PLC) in industrial automation?
,A. Data storage
B. Control of processes
C. Energy generation
D. Human communication
Rationale: PLCs are used to automate and control industrial
processes.
Answer: B
6. Which protective device is designed to prevent overcurrent
in an electrical circuit?
A. Circuit breaker
B. Fuse
C. Relay
D. Capacitor
Rationale: Circuit breakers and fuses disconnect circuits under
overcurrent conditions.
Answer: A, B
7. What is the typical range of a thermocouple type K?
A. 0–100°C
B. −200°C to 1250°C
C. 0–500°C
D. −50°C to 200°C
Rationale: Type K thermocouples operate over a wide range
suitable for industrial processes.
Answer: B
, 8. Which of these statements about three-phase induction
motors is correct?
A. They are self-starting
B. They are synchronous
C. They operate on DC only
D. They require external excitation
Rationale: Three-phase induction motors are self-starting AC
motors.
Answer: A
9. What is the unit of electrical capacitance?
A. Ohm
B. Farad
C. Henry
D. Tesla
Rationale: Capacitance is measured in Farads.
Answer: B
10. Which of the following signals are commonly used in
industrial instrumentation?
A. 4–20 mA
B. 0–10 V
C. Digital pulses
D. 220V AC mains
TECHNOLOGIST GRADE 2 EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES Q&A 2026 |INSTANT DOWNLOAD
1. What is the main purpose of a current transformer (CT) in
an electrical system?
A. To step up voltage
B. To measure high currents safely
C. To step down current for protection devices
D. To store electrical energy
Rationale: CTs are used to safely measure or monitor high
currents by producing a proportional lower current.
Answer: B, C
2. Which instrument is commonly used to measure insulation
resistance of motors and cables?
A. Voltmeter
B. Megger
C. Clamp meter
D. Oscilloscope
Rationale: A megger applies a high DC voltage to measure
,insulation resistance.
Answer: B
3. In a 3-phase, 4-wire system, what is the phase voltage if the
line voltage is 415V?
A. 240V
B. 230V
C. 415V
D. 120V
Rationale: Phase voltage = Line voltage / √3 → .732 ≈
240V.
Answer: A
4. Which of the following are types of sensors used in process
instrumentation?
A. Temperature sensors
B. Pressure sensors
C. Level sensors
D. Memory chips
Rationale: Sensors detect physical variables like temperature,
pressure, and level.
Answer: A, B, C
5. What is the purpose of a Programmable Logic Controller
(PLC) in industrial automation?
,A. Data storage
B. Control of processes
C. Energy generation
D. Human communication
Rationale: PLCs are used to automate and control industrial
processes.
Answer: B
6. Which protective device is designed to prevent overcurrent
in an electrical circuit?
A. Circuit breaker
B. Fuse
C. Relay
D. Capacitor
Rationale: Circuit breakers and fuses disconnect circuits under
overcurrent conditions.
Answer: A, B
7. What is the typical range of a thermocouple type K?
A. 0–100°C
B. −200°C to 1250°C
C. 0–500°C
D. −50°C to 200°C
Rationale: Type K thermocouples operate over a wide range
suitable for industrial processes.
Answer: B
, 8. Which of these statements about three-phase induction
motors is correct?
A. They are self-starting
B. They are synchronous
C. They operate on DC only
D. They require external excitation
Rationale: Three-phase induction motors are self-starting AC
motors.
Answer: A
9. What is the unit of electrical capacitance?
A. Ohm
B. Farad
C. Henry
D. Tesla
Rationale: Capacitance is measured in Farads.
Answer: B
10. Which of the following signals are commonly used in
industrial instrumentation?
A. 4–20 mA
B. 0–10 V
C. Digital pulses
D. 220V AC mains
