Colorado Meter Technician Certification
Exam Practice Questions And Correct
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Rationale 2026 Q&A| Instant Download
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1. Which instrument is primarily used by a meter technician to verify the
accuracy of an electric watt-hour meter in the field?
A. Megohmmeter
B. Phase rotation meter
C. Reference standard meter
D. Ground resistance tester
Answer: C. Reference standard meter
Rationale: A reference standard meter is a calibrated device used to
compare the performance of the service meter under test. Meter
technicians rely on these standards to ensure customer billing accuracy and
regulatory compliance.
2. What is the primary purpose of a current transformer (CT) in electric
metering applications?
A. To increase circuit voltage
B. To reduce high current to a measurable value
, C. To provide surge protection
D. To regulate system frequency
Answer: B. To reduce high current to a measurable value
Rationale: Current transformers safely step down high line currents to
lower values suitable for metering equipment. This allows meters to
measure large electrical loads without direct exposure to dangerous
currents.
3. A meter technician observes a meter creeping when no load is
connected. What does this indicate?
A. The meter is operating normally
B. The meter is under-registering
C. The meter disk or register moves without load
D. The CT polarity is reversed
Answer: C. The meter disk or register moves without load
Rationale: Creeping occurs when the meter continues to register
consumption even though no electrical load exists. This condition may
result from vibration, stray magnetic fields, or improper calibration.
4. Which law defines the relationship between voltage, current, and
resistance?
A. Kirchhoff’s Law
B. Ohm’s Law
C. Faraday’s Law
D. Coulomb’s Law
Answer: B. Ohm’s Law
Rationale: Ohm’s Law establishes that voltage equals current multiplied by
resistance. Meter technicians use this principle frequently when
troubleshooting circuits and verifying electrical measurements.
, 5. What is the standard secondary current rating for most metering
current transformers?
A. 1 ampere
B. 2 amperes
C. 5 amperes
D. 10 amperes
Answer: C. 5 amperes
Rationale: Most utility metering CTs are designed with a standard 5-amp
secondary output. This industry standard ensures compatibility with
metering equipment and testing instruments.
6. Which safety procedure must always be followed before removing an
electric meter from service?
A. Notify the customer after removal
B. Use only insulated screwdrivers
C. Verify proper authorization and de-energization procedures
D. Disconnect the neutral conductor first
Answer: C. Verify proper authorization and de-energization procedures
Rationale: Meter removal can expose personnel to energized conductors
and arc flash hazards. Proper authorization, lockout/tagout procedures,
and verification of safe conditions are essential for worker safety.
7. What is the purpose of a potential transformer (PT) in a metering
installation?
A. To step down voltage for measurement
B. To increase meter sensitivity
C. To isolate neutral conductors
D. To balance three-phase loads
Answer: A. To step down voltage for measurement
, Rationale: Potential transformers reduce high system voltages to safer and
measurable levels for meters and instrumentation. They allow accurate
voltage sensing without directly exposing equipment to high voltage.
8. A three-phase, four-wire service commonly operates at which voltage
configuration?
A. 120/240 V single-phase
B. 120/208 V wye
C. 240 V delta only
D. 277 V single-phase
Answer: B. 120/208 V wye
Rationale: The 120/208 V wye configuration is widely used in commercial
buildings. It provides both phase-to-neutral and phase-to-phase voltages
for diverse electrical loads.
9. What device protects metering equipment from excessive current
flow?
A. Voltage regulator
B. Capacitor bank
C. Fuse or circuit breaker
D. Watt transducer
Answer: C. Fuse or circuit breaker
Rationale: Fuses and circuit breakers interrupt fault currents that could
damage meters and associated equipment. Proper overcurrent protection
is essential for system safety and equipment longevity.
10. Which type of meter contains no moving mechanical disk?
A. Induction meter
B. Electromechanical meter
C. Solid-state meter
D. Demand register meter
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. Which instrument is primarily used by a meter technician to verify the
accuracy of an electric watt-hour meter in the field?
A. Megohmmeter
B. Phase rotation meter
C. Reference standard meter
D. Ground resistance tester
Answer: C. Reference standard meter
Rationale: A reference standard meter is a calibrated device used to
compare the performance of the service meter under test. Meter
technicians rely on these standards to ensure customer billing accuracy and
regulatory compliance.
2. What is the primary purpose of a current transformer (CT) in electric
metering applications?
A. To increase circuit voltage
B. To reduce high current to a measurable value
, C. To provide surge protection
D. To regulate system frequency
Answer: B. To reduce high current to a measurable value
Rationale: Current transformers safely step down high line currents to
lower values suitable for metering equipment. This allows meters to
measure large electrical loads without direct exposure to dangerous
currents.
3. A meter technician observes a meter creeping when no load is
connected. What does this indicate?
A. The meter is operating normally
B. The meter is under-registering
C. The meter disk or register moves without load
D. The CT polarity is reversed
Answer: C. The meter disk or register moves without load
Rationale: Creeping occurs when the meter continues to register
consumption even though no electrical load exists. This condition may
result from vibration, stray magnetic fields, or improper calibration.
4. Which law defines the relationship between voltage, current, and
resistance?
A. Kirchhoff’s Law
B. Ohm’s Law
C. Faraday’s Law
D. Coulomb’s Law
Answer: B. Ohm’s Law
Rationale: Ohm’s Law establishes that voltage equals current multiplied by
resistance. Meter technicians use this principle frequently when
troubleshooting circuits and verifying electrical measurements.
, 5. What is the standard secondary current rating for most metering
current transformers?
A. 1 ampere
B. 2 amperes
C. 5 amperes
D. 10 amperes
Answer: C. 5 amperes
Rationale: Most utility metering CTs are designed with a standard 5-amp
secondary output. This industry standard ensures compatibility with
metering equipment and testing instruments.
6. Which safety procedure must always be followed before removing an
electric meter from service?
A. Notify the customer after removal
B. Use only insulated screwdrivers
C. Verify proper authorization and de-energization procedures
D. Disconnect the neutral conductor first
Answer: C. Verify proper authorization and de-energization procedures
Rationale: Meter removal can expose personnel to energized conductors
and arc flash hazards. Proper authorization, lockout/tagout procedures,
and verification of safe conditions are essential for worker safety.
7. What is the purpose of a potential transformer (PT) in a metering
installation?
A. To step down voltage for measurement
B. To increase meter sensitivity
C. To isolate neutral conductors
D. To balance three-phase loads
Answer: A. To step down voltage for measurement
, Rationale: Potential transformers reduce high system voltages to safer and
measurable levels for meters and instrumentation. They allow accurate
voltage sensing without directly exposing equipment to high voltage.
8. A three-phase, four-wire service commonly operates at which voltage
configuration?
A. 120/240 V single-phase
B. 120/208 V wye
C. 240 V delta only
D. 277 V single-phase
Answer: B. 120/208 V wye
Rationale: The 120/208 V wye configuration is widely used in commercial
buildings. It provides both phase-to-neutral and phase-to-phase voltages
for diverse electrical loads.
9. What device protects metering equipment from excessive current
flow?
A. Voltage regulator
B. Capacitor bank
C. Fuse or circuit breaker
D. Watt transducer
Answer: C. Fuse or circuit breaker
Rationale: Fuses and circuit breakers interrupt fault currents that could
damage meters and associated equipment. Proper overcurrent protection
is essential for system safety and equipment longevity.
10. Which type of meter contains no moving mechanical disk?
A. Induction meter
B. Electromechanical meter
C. Solid-state meter
D. Demand register meter
