Maintenance
15 free questions with worked answers, and 144 more in the full bank.
Free questions
A maintenance team replaces the air filters on HVAC rooftop units every three months, regardless of their condition. What type of maintenance strategy is this?
1 mark · Easy
A facility uses ultrasonic sensors to monitor the high-frequency acoustic emissions of roller bearings on a critical conveyor. When the acoustic signature crosses a threshold, a work order is generated. What strategy is this?
3 marks · Medium
A technician repairing a failed boiler feed pump decides to analyze why the seal failed. They discover the baseplate is vibrating due to improper grouting, so they regrout the baseplate to prevent future seal failures. What strategy does this represent?
4 marks · Hard
A technician is troubleshooting a PLC ladder logic program. A physical emergency stop button is wired normally closed (NC) in the field. In the ladder logic, what instruction should be used to allow the machine to run when the E-stop is NOT pressed?
3 marks · Medium
A PLC controls a pneumatic cylinder. The sequence stops mid-cycle. The technician forces the output bit ON in the PLC software, and the cylinder moves. What does this confirm?
4 marks · Hard
A pressure transmitter operates on a standard 4-20mA loop. What is the primary advantage of using a "live zero" (4mA) instead of 0-20mA?
1 mark · Easy
A level transmitter is scaled from 0 to 100 inches. The loop current is currently measuring 12mA. What is the actual water level in the tank?
3 marks · Medium
A 4-20mA loop is wired in series through a transmitter, a PLC input card (250 ohm resistor), and a chart recorder (250 ohm resistor). The power supply is 24VDC. The transmitter requires a minimum of 12VDC to operate. Will this loop function at 20mA?
4 marks · Hard
A technician calibrates a pH probe. They record the readings before making any adjustments, then calibrate the device, and record the readings again. What is this documentation standard called?
3 marks · Medium
A temperature transmitter is calibrated for 0°C to 200°C. During a 5-point calibration, the tech notes that the output is perfectly accurate going up the scale, but reads consistently 2 degrees high when coming down the scale. What physical phenomenon is the instrument exhibiting?
4 marks · Hard
A vibration analyst reviews an FFT spectrum on a large centrifugal fan running at 1800 RPM (30 Hz). There is a massive spike exactly at 1X running speed (30 Hz). What is the most likely mechanical fault?
3 marks · Medium
An induction motor driving a pump via a flexible coupling shows high vibration at 1X and 2X turning speed, accompanied by a 180-degree phase shift across the coupling. What is the definitive diagnosis?
4 marks · Hard
A maintenance electrician scans a 3-phase motor starter with an infrared camera. Phase A is 45°C, Phase B is 46°C, and Phase C is 95°C. What is the most likely cause of this discrepancy?
1 mark · Easy
When conducting an outdoor thermography inspection of a substation on a bright sunny day, the technician notes that all the ceramic insulators on the east side appear extremely hot. What must the technician consider?
3 marks · Medium
A process engineer wants to change the alarm setpoint of a high-pressure reactor from 500 psi to 550 psi to prevent nuisance trips. The vessel is rated for 600 psi. What formal process MUST be followed before the technician makes the change in the PLC?
3 marks · Medium
More Maintenance questions (page 2 of 3)
Answers and explanations are in the full bank.
- During routine technical work, which statement about correct lubrication practice should guide the technician? · 3 marks
- During routine technical work, which statement about shaft alignment should guide the technician? · 3 marks
- During routine technical work, which statement about vibration analysis should guide the technician? · 3 marks
- During routine technical work, which statement about infrared thermography should guide the technician? · 3 marks
- During routine technical work, which statement about lubricating-oil analysis should guide the technician? · 3 marks
- During routine technical work, which statement about technical cleaning should guide the technician? · 3 marks
- During routine technical work, which statement about a maintenance inspection should guide the technician? · 3 marks
- During routine technical work, which statement about a computerized maintenance management system should guide the technician? · 3 marks
- During routine technical work, which statement about root-cause analysis should guide the technician? · 3 marks
- During routine technical work, which statement about failure mode and effects analysis should guide the technician? · 3 marks
- During routine technical work, which statement about critical spare-parts planning should guide the technician? · 3 marks
- During routine technical work, which statement about maintenance closeout documentation should guide the technician? · 3 marks
- A UPS stores 1800 Wh, of which 75% is usable, and carries a 400 W load. What is the idealised runtime? · 3 marks
- Equipment records MTBF of 200 h and MTTR of 1.1 h. What inherent availability does that give? · 3 marks
- A maintenance schedule planned 123 tasks and 68 were completed on time. What is the on-time compliance? · 1 mark
- While fault-finding in a TVET training workshop, a lamp in a series circuit is unlit and a voltmeter across it reads 0 V. What does that indicate? · 4 marks
- While fault-finding in a sector office network, a protective device opens instantly every time it is reset. What does that indicate? · 4 marks
- While fault-finding in a Kigali district office, a lamp in a series circuit is unlit and a voltmeter across it reads the full supply voltage. What does that indicate? · 4 marks
- While fault-finding in a health-centre server room, an earth-leakage device trips only when one particular appliance is connected. What does that indicate? · 4 marks
- While fault-finding in a school computer lab, a lamp in a series circuit is unlit and a voltmeter across it reads 0 V. What does that indicate? · 4 marks
- While fault-finding in a school computer lab, a three-phase motor runs hot and noisy with reduced torque. What does that indicate? · 4 marks
- While fault-finding in a TVET training workshop, a protective device opens instantly every time it is reset. What does that indicate? · 4 marks
- While fault-finding in a hospital IT room, a lamp in a series circuit is unlit and a voltmeter across it reads 0 V. What does that indicate? · 4 marks
- While fault-finding in a TVET training workshop, a circuit works until load is applied, then the voltage at the load collapses. What does that indicate? · 4 marks
- While fault-finding in a hospital IT room, a circuit works until load is applied, then the voltage at the load collapses. What does that indicate? · 4 marks
- While fault-finding in a sector office network, a lamp in a series circuit is unlit and a voltmeter across it reads 0 V. What does that indicate? · 4 marks
- While fault-finding in a Kigali district office, a lamp in a series circuit is unlit and a voltmeter across it reads 0 V. What does that indicate? · 4 marks
- While fault-finding in a school computer lab, an earth-leakage device trips only when one particular appliance is connected. What does that indicate? · 4 marks
- While fault-finding in a health-centre server room, a lamp in a series circuit is unlit and a voltmeter across it reads the full supply voltage. What does that indicate? · 4 marks
- While fault-finding in a hospital IT room, a three-phase motor runs hot and noisy with reduced torque. What does that indicate? · 4 marks
- While fault-finding in a health-centre server room, a three-phase motor runs hot and noisy with reduced torque. What does that indicate? · 4 marks
- While fault-finding in a school computer lab, a circuit works until load is applied, then the voltage at the load collapses. What does that indicate? · 4 marks
- While fault-finding in a Kigali district office, an earth-leakage device trips only when one particular appliance is connected. What does that indicate? · 4 marks
- While fault-finding in a school computer lab, a lamp in a series circuit is unlit and a voltmeter across it reads the full supply voltage. What does that indicate? · 4 marks
- While fault-finding in a hospital IT room, an earth-leakage device trips only when one particular appliance is connected. What does that indicate? · 4 marks
- While fault-finding in a sector office network, a lamp in a series circuit is unlit and a voltmeter across it reads the full supply voltage. What does that indicate? · 4 marks
- While fault-finding in a sector office network, an earth-leakage device trips only when one particular appliance is connected. What does that indicate? · 4 marks
- While fault-finding in a sector office network, a three-phase motor runs hot and noisy with reduced torque. What does that indicate? · 4 marks
- While fault-finding in a TVET training workshop, a three-phase motor runs hot and noisy with reduced torque. What does that indicate? · 4 marks
- While fault-finding in a Kigali district office, a circuit works until load is applied, then the voltage at the load collapses. What does that indicate? · 4 marks
- While fault-finding in a TVET training workshop, an earth-leakage device trips only when one particular appliance is connected. What does that indicate? · 4 marks
- While fault-finding in a health-centre server room, a circuit works until load is applied, then the voltage at the load collapses. What does that indicate? · 4 marks
- While fault-finding in a Kigali district office, a protective device opens instantly every time it is reset. What does that indicate? · 4 marks
- While fault-finding in a health-centre server room, a lamp in a series circuit is unlit and a voltmeter across it reads 0 V. What does that indicate? · 4 marks
- While fault-finding in a Kigali district office, a three-phase motor runs hot and noisy with reduced torque. What does that indicate? · 4 marks
- While fault-finding in a hospital IT room, a protective device opens instantly every time it is reset. What does that indicate? · 4 marks
- While fault-finding in a sector office network, a circuit works until load is applied, then the voltage at the load collapses. What does that indicate? · 4 marks
- While fault-finding in a TVET training workshop, a lamp in a series circuit is unlit and a voltmeter across it reads the full supply voltage. What does that indicate? · 4 marks
- While fault-finding in a health-centre server room, a protective device opens instantly every time it is reset. What does that indicate? · 4 marks
- While fault-finding in a hospital IT room, a lamp in a series circuit is unlit and a voltmeter across it reads the full supply voltage. What does that indicate? · 4 marks
- While fault-finding in a school computer lab, a protective device opens instantly every time it is reset. What does that indicate? · 4 marks
- A supervisor tests your knowledge of preventive maintenance. Which answer is best? · 3 marks
- A certification question asks about workaround. Which answer is correct? · 3 marks
- During a workshop assessment, the reported condition is: A bearing's temperature and vibration are both trending upward over several weekly readings. What is the best maintenance response? · 1 mark
- During a workshop assessment, the reported condition is: A motor bearing overheats shortly after being filled completely with grease. Which maintenance error is likely? · 3 marks
- During a workshop assessment, the reported condition is: A newly coupled pump has high axial vibration and coupling wear. Which condition should be checked? · 1 mark
- During a workshop assessment, the reported condition is: A vibration spectrum has a strong component at running speed and phase is stable across repeated measurements. Which fault is commonly associated with this pattern? · 3 marks
- During a workshop assessment, the reported condition is: An infrared scan shows one electrical terminal much hotter than adjacent phases under similar load. What is the safest next step? · 1 mark
- During a workshop assessment, the reported condition is: Oil analysis reports rising water content and decreasing dielectric strength in an oil-filled electrical asset. What should be addressed? · 3 marks
- During a workshop assessment, the reported condition is: A filter's differential pressure rises above its specified limit while system flow falls. What is the likely condition? · 1 mark