OHIO MAINTENANCE TECHNICIAN EXAM – Most Tested
Questions with Verified Answers & Rationales | Comprehensive
Study Guide | Instant Pdf Download
Coverage Overview:
This 200-question test bank covers the broad scope of knowledge required for a maintenance technician in
commercial, industrial, and residential settings. Each question includes a verified answer in bold italic with a tick and
a concise rationale. Key topic areas include:
Safety & OSHA Standards: Lockout/tagout procedures, fall protection (6-foot rule), ladder safety (3-foot
extension above roof), GFCI operation and testing, fire extinguisher types, confined space awareness,
proper handling of compressed gas cylinders, SDS documentation, and personal protective equipment
(PPE). Electrical safety including the one-hand rule, de-energizing circuits before work, and lockout/tagout
compliance.
Electrical Fundamentals & Wiring: AC/DC theory basics, Ohm's law and power calculations, use of
multimeters (voltage, current, resistance, continuity), clamp-on ammeters, megohmmeters for insulation
testing. Wire sizing (AWG), color coding (black/red hot, white neutral, green/bare ground), circuit breaker
and fuse sizing and troubleshooting, GFCI and AFCI operation, single-phase and three-phase systems
(120/240V, 120/208V, 277/480V), transformers (step-down for control circuits), and electrical safety
practices.
Motors & Motor Controls: Types of single-phase motors (split-phase, capacitor-start, PSC, shaded-pole),
start and run capacitors (testing, symptoms of failure), centrifugal switches, three-phase motors, contactors
and relays, motor starters with overload protection, variable frequency drives (VFDs), H-O-A switches,
phase monitors, and motor troubleshooting (humming, overheating, bearing noise). Motor nameplate
interpretation, service factor, and proper lubrication.
Plumbing Systems & Pipe Fitting: Water supply systems (pressure ranges, pressure reducing valves,
water hammer arrestors), drainage and venting (P-traps, check valves, vacuum breakers), pipe materials
(copper, PVC, CPVC, PEX, galvanized steel), soldering copper pipe (flux, heat, capillary action), solvent
welding PVC, threading pipe (dies and taps), dielectric unions to prevent galvanic corrosion. Common
plumbing repairs: toilet components (flapper, fill valve, siphon jet), faucet repair (cartridges, washers, O-
rings), water heater maintenance (T&P relief valve, drain valve, expansion tank, anode rod), sump pumps,
and water softeners.
HVAC & Refrigeration: Fundamentals of the refrigeration cycle (compressor, condenser, metering device,
evaporator), common refrigerants (R-22, R-410A), superheat and subcooling concepts, troubleshooting low
refrigerant charge, air filter maintenance and airflow, forced-air furnace components (heat exchanger, draft
inducer, pressure switch, thermocouple, flame sensor), heat pump operation and reversing valve, air
conditioning split systems, packaged units, chilled water systems, cooling towers, pneumatic controls (3-15
psi), DDC and building automation basics. Ductwork components (diffusers, dampers, economizers, smoke
detectors), humidification, and make-up air units. Common symptoms and diagnostics: frozen coils, low
airflow, clogged filter-driers, compressor slugging, crankcase heaters.
Carpentry, Drywall & Painting: Dimensional lumber actual sizes (e.g., 2x4 = 1.5"x3.5"), types of fasteners
(common nails, drywall screws, masonry nails, lag bolts), screw head types (Phillips, Torx, Robertson),
drywall composition and repair techniques (taping, mudding), painting preparation (primers, surface prep),
door adjustment (hinge tightening, planing), and basic framing principles.
, Tools & Equipment Usage: Proper use and safety of hand tools (wrenches, pliers, screwdrivers), power
tools (drills, circular saws, reciprocating saws, angle grinders, rotary hammers), measuring instruments
(multimeters, clamp meters, manometers, tachometers, infrared thermometers, torque wrenches), pipe
working tools (cutters, threaders, reamers), bearing pullers, fish tape, and ladders (stepladders, extension
ladders).
Pumps, Bearings & Mechanical Systems: Centrifugal vs. positive displacement pumps, pump
components (impeller, volute, mechanical seal), sump pumps and check valves, bearing types (sleeve/plain,
ball, roller, thrust), lubrication practices (grease guns, oil types), belt drives (V-belts, sheave alignment,
tension gauges, symptoms of wear), chain drives, couplings, and vibration isolation.
Boilers & Hydronics: Low-pressure steam and hot water boilers, relief valves, low water cut-offs,
expansion tanks, air vents, zone valves, circulator pumps, and basic water treatment.
Building Systems & General Maintenance: Fire protection (sprinkler heads, duct smoke detectors), door
hardware (closers, hinges, panic bars), window and glazing repairs, flooring repairs, basic welding and
cutting (acetylene cylinder colors, safety), concrete fastening (masonry nails, anchors), and general
troubleshooting methodology (systematic diagnosis, checking voltage/pressure/continuity before replacing
parts).
Q1. Before performing any maintenance task on a machine, the first step should
always be to:
A) Put on safety glasses
B) ✓ Follow proper lockout/tagout (LOTO) procedures to ensure all energy sources
are isolated
C) Inform the supervisor
D) Test the machine to see if it's working
Lockout/tagout prevents accidental startup or release of hazardous energy, which is the
leading cause of serious injuries in maintenance work.
Q2. A ground fault circuit interrupter (GFCI) is designed to:
A) Protect equipment from overloads
,B) ✓ Protect people from electric shock by quickly shutting off power when a ground
fault is detected
C) Reduce energy consumption
D) Prevent short circuits in motors
GFCIs monitor the balance of current and trip when even a small leakage to ground is
detected, preventing electrocution.
Q3. Which of the following is the correct color for a ground wire in a typical 120V AC
circuit?
A) Black
B) White
C) ✓ Green or bare copper
D) Red
Green or bare copper is used for grounding conductors; white is neutral, black and red are
hot.
Q4. When working at heights above 6 feet in general industry, OSHA requires:
A) A safety net only
B) ✓ Use of fall protection such as guardrails, safety nets, or personal fall arrest
systems
C) A spotter on the ground
, D) No specific protection is needed
OSHA 1910.28 requires fall protection for employees working at heights of 4 feet (general
industry) or 6 feet (construction); for maintenance, 6 feet is a common threshold.
Q5. The primary function of a fuse or circuit breaker is to:
A) Regulate voltage
B) ✓ Protect wiring and equipment from excessive current that could cause
overheating or fire
C) Control the speed of a motor
D) Convert AC to DC
Overcurrent protection devices open the circuit if current exceeds a safe level, protecting
conductors and connected devices.
Q6. A multimeter can be used to measure:
A) Only voltage
B) Only resistance
C) ✓ Voltage, current, and resistance
D) Only continuity
A digital multimeter (DMM) is a versatile tool for measuring AC/DC voltage, current,
resistance, and often other parameters like capacitance or frequency.
Questions with Verified Answers & Rationales | Comprehensive
Study Guide | Instant Pdf Download
Coverage Overview:
This 200-question test bank covers the broad scope of knowledge required for a maintenance technician in
commercial, industrial, and residential settings. Each question includes a verified answer in bold italic with a tick and
a concise rationale. Key topic areas include:
Safety & OSHA Standards: Lockout/tagout procedures, fall protection (6-foot rule), ladder safety (3-foot
extension above roof), GFCI operation and testing, fire extinguisher types, confined space awareness,
proper handling of compressed gas cylinders, SDS documentation, and personal protective equipment
(PPE). Electrical safety including the one-hand rule, de-energizing circuits before work, and lockout/tagout
compliance.
Electrical Fundamentals & Wiring: AC/DC theory basics, Ohm's law and power calculations, use of
multimeters (voltage, current, resistance, continuity), clamp-on ammeters, megohmmeters for insulation
testing. Wire sizing (AWG), color coding (black/red hot, white neutral, green/bare ground), circuit breaker
and fuse sizing and troubleshooting, GFCI and AFCI operation, single-phase and three-phase systems
(120/240V, 120/208V, 277/480V), transformers (step-down for control circuits), and electrical safety
practices.
Motors & Motor Controls: Types of single-phase motors (split-phase, capacitor-start, PSC, shaded-pole),
start and run capacitors (testing, symptoms of failure), centrifugal switches, three-phase motors, contactors
and relays, motor starters with overload protection, variable frequency drives (VFDs), H-O-A switches,
phase monitors, and motor troubleshooting (humming, overheating, bearing noise). Motor nameplate
interpretation, service factor, and proper lubrication.
Plumbing Systems & Pipe Fitting: Water supply systems (pressure ranges, pressure reducing valves,
water hammer arrestors), drainage and venting (P-traps, check valves, vacuum breakers), pipe materials
(copper, PVC, CPVC, PEX, galvanized steel), soldering copper pipe (flux, heat, capillary action), solvent
welding PVC, threading pipe (dies and taps), dielectric unions to prevent galvanic corrosion. Common
plumbing repairs: toilet components (flapper, fill valve, siphon jet), faucet repair (cartridges, washers, O-
rings), water heater maintenance (T&P relief valve, drain valve, expansion tank, anode rod), sump pumps,
and water softeners.
HVAC & Refrigeration: Fundamentals of the refrigeration cycle (compressor, condenser, metering device,
evaporator), common refrigerants (R-22, R-410A), superheat and subcooling concepts, troubleshooting low
refrigerant charge, air filter maintenance and airflow, forced-air furnace components (heat exchanger, draft
inducer, pressure switch, thermocouple, flame sensor), heat pump operation and reversing valve, air
conditioning split systems, packaged units, chilled water systems, cooling towers, pneumatic controls (3-15
psi), DDC and building automation basics. Ductwork components (diffusers, dampers, economizers, smoke
detectors), humidification, and make-up air units. Common symptoms and diagnostics: frozen coils, low
airflow, clogged filter-driers, compressor slugging, crankcase heaters.
Carpentry, Drywall & Painting: Dimensional lumber actual sizes (e.g., 2x4 = 1.5"x3.5"), types of fasteners
(common nails, drywall screws, masonry nails, lag bolts), screw head types (Phillips, Torx, Robertson),
drywall composition and repair techniques (taping, mudding), painting preparation (primers, surface prep),
door adjustment (hinge tightening, planing), and basic framing principles.
, Tools & Equipment Usage: Proper use and safety of hand tools (wrenches, pliers, screwdrivers), power
tools (drills, circular saws, reciprocating saws, angle grinders, rotary hammers), measuring instruments
(multimeters, clamp meters, manometers, tachometers, infrared thermometers, torque wrenches), pipe
working tools (cutters, threaders, reamers), bearing pullers, fish tape, and ladders (stepladders, extension
ladders).
Pumps, Bearings & Mechanical Systems: Centrifugal vs. positive displacement pumps, pump
components (impeller, volute, mechanical seal), sump pumps and check valves, bearing types (sleeve/plain,
ball, roller, thrust), lubrication practices (grease guns, oil types), belt drives (V-belts, sheave alignment,
tension gauges, symptoms of wear), chain drives, couplings, and vibration isolation.
Boilers & Hydronics: Low-pressure steam and hot water boilers, relief valves, low water cut-offs,
expansion tanks, air vents, zone valves, circulator pumps, and basic water treatment.
Building Systems & General Maintenance: Fire protection (sprinkler heads, duct smoke detectors), door
hardware (closers, hinges, panic bars), window and glazing repairs, flooring repairs, basic welding and
cutting (acetylene cylinder colors, safety), concrete fastening (masonry nails, anchors), and general
troubleshooting methodology (systematic diagnosis, checking voltage/pressure/continuity before replacing
parts).
Q1. Before performing any maintenance task on a machine, the first step should
always be to:
A) Put on safety glasses
B) ✓ Follow proper lockout/tagout (LOTO) procedures to ensure all energy sources
are isolated
C) Inform the supervisor
D) Test the machine to see if it's working
Lockout/tagout prevents accidental startup or release of hazardous energy, which is the
leading cause of serious injuries in maintenance work.
Q2. A ground fault circuit interrupter (GFCI) is designed to:
A) Protect equipment from overloads
,B) ✓ Protect people from electric shock by quickly shutting off power when a ground
fault is detected
C) Reduce energy consumption
D) Prevent short circuits in motors
GFCIs monitor the balance of current and trip when even a small leakage to ground is
detected, preventing electrocution.
Q3. Which of the following is the correct color for a ground wire in a typical 120V AC
circuit?
A) Black
B) White
C) ✓ Green or bare copper
D) Red
Green or bare copper is used for grounding conductors; white is neutral, black and red are
hot.
Q4. When working at heights above 6 feet in general industry, OSHA requires:
A) A safety net only
B) ✓ Use of fall protection such as guardrails, safety nets, or personal fall arrest
systems
C) A spotter on the ground
, D) No specific protection is needed
OSHA 1910.28 requires fall protection for employees working at heights of 4 feet (general
industry) or 6 feet (construction); for maintenance, 6 feet is a common threshold.
Q5. The primary function of a fuse or circuit breaker is to:
A) Regulate voltage
B) ✓ Protect wiring and equipment from excessive current that could cause
overheating or fire
C) Control the speed of a motor
D) Convert AC to DC
Overcurrent protection devices open the circuit if current exceeds a safe level, protecting
conductors and connected devices.
Q6. A multimeter can be used to measure:
A) Only voltage
B) Only resistance
C) ✓ Voltage, current, and resistance
D) Only continuity
A digital multimeter (DMM) is a versatile tool for measuring AC/DC voltage, current,
resistance, and often other parameters like capacitance or frequency.
