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100+ Free CPCS A04 Tower Crane Practice Questions

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2026 Statistics

Key Facts: CPCS A04 Tower Crane Exam

80%

Passing Score

CPCS A04 Assessment Standard

60 min

Exam Duration

NOCN CPCS Guidelines

5 Years

Blue Card Validity

NOCN Job Cards Scheme

100 Qs

Practice Question Bank

OpenExamPrep

Pass the CPCS A04 Tower Crane theory test by demonstrating expertise in luffing and trolley jibs, base anchorage, moment limiters, in-service/out-of-service wind limits, weather-vanning, radio signals, and emergency lowering procedures.

Sample CPCS A04 Tower Crane Practice Questions

Try these sample questions to test your CPCS A04 Tower Crane exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1What is the principal operational difference between a trolley (saddle) jib tower crane and a luffing jib tower crane?
A.A trolley jib stays horizontal while a trolley moves the hook; a luffing jib raises and lowers the entire jib to alter hook radius.
B.A trolley jib can rotate 360 degrees, whereas a luffing jib is fixed in slew direction.
C.A luffing jib has no hoist rope and uses hydraulic cylinders directly to lift loads.
D.A trolley jib can only be mounted on traveling bases, while a luffing jib must be static.
Explanation: On a trolley (saddle) jib crane, the boom remains horizontal (or slightly elevated) and radius is changed by driving a trolley along the jib. On a luffing jib crane, radius is varied by raising or lowering the inclined jib structure itself.
2Why are luffing jib tower cranes predominantly selected for congested urban construction sites?
A.They can operate at high jib angles to clear adjacent oversailing restrictions and tall neighbouring buildings.
B.They require zero counter-ballast weight at the rear of the slewing upper structure.
C.They are immune to high wind speeds and never require weather-vanning.
D.They can lift double their maximum rated capacity compared to trolley jib cranes.
Explanation: Luffing jibs can be raised to steep angles (e.g., 70–85 degrees), creating a small out-of-service and operating radius that avoids slewing over adjacent boundary lines or neighbouring properties.
3What is the primary function of central ballast ballast blocks on a bottom-slewing self-erecting tower crane?
A.To stabilize the non-slewing lower chassis against overturning moments during operation and storm conditions.
B.To provide emergency braking force for the slewing mechanism.
C.To act as a anchor weight for the hoist rope dead-end reeving.
D.To adjust the working height of the telescopic mast during operation.
Explanation: Central ballast blocks are placed on the lower chassis frame of bottom-slewing cranes to ensure overall stability against overturning moments generated by suspended loads, slewing forces, and wind.
4Under UK HSE guidance and BS 7121-5, what device must continuously measure and display wind speed to the tower crane operator?
A.An anemometer fitted at the highest point of the crane (usually tower top or jib tip).
B.A barometric pressure sensor installed inside the operator cab.
C.A strain gauge mounted on the main hoist wire rope.
D.A tachometer attached to the slewing ring pinion.
Explanation: An anemometer positioned at the highest point of the crane structure measures wind velocity and sends real-time readings to an indicator inside the cab.
5What does the term 'weather-vanning' mean when leaving a top-slewing tower crane out of service?
A.Releasing the slew brake so the jib free-slews and points downwind like a wind vane to minimize wind resistance.
B.Locking the slew brake tightly in the direction of the building under construction.
C.Lowering the hook block onto the ground and tying the jib to scaffolding with steel wire rope.
D.Enclosing the operator cab in protective waterproof canvassing.
Explanation: Weather-vanning (free-slewing) requires disengaging the slewing brake mechanism when out of service so wind pressure automatically turns the jib pointing downwind, presenting minimum surface area and structural stress.
6What primary safety device prevents a tower crane from lifting a load that exceeds the maximum rated load moment?
A.Rated Capacity Limiter (RCL) / Load Moment Limiter.
B.Slew limit switch.
C.Trolley buffer stop.
D.Telescoping lock pin.
Explanation: The Rated Capacity Limiter (RCL) or Load Moment Limiter automatically cuts off crane motions that would increase load moment (e.g. hoisting or trolleying outward) when the load product (mass × radius) exceeds safe limits.
7During a 'blind lift' where the crane operator cannot see the load or landing area, how must instructions be communicated?
A.Via a dedicated two-way radio channel or relay Slinger/Signaller using standardized BS 7121 voice commands.
B.By the operator leaning out of the cab window to visually locate the load.
C.Using mobile phone text messages between the site manager and operator.
D.By sounding the crane air horn once for up and twice for down.
Explanation: Blind lifts require clear, uninterrupted communication using a dedicated radio channel (or clear line-of-sight signal relayers) following BS 7121 standard lifting terminology.
8What must the tower crane operator check regarding the hook block during daily pre-operational inspections?
A.Safety latch condition, swivel rotation, sheaves, frame integrity, and hook opening/wear.
B.That the hook is painted yellow only.
C.That the hook weight matches the total ballast of the crane base.
D.That the hook block is greased every 30 minutes.
Explanation: Daily pre-use checks on the hook block include inspecting the safety latch mechanism, ensuring the hook swivels freely, checking sheaves and wire rope grooves, inspecting frame bolts, and checking for cracks or deformation.
9What is the purpose of a hoist upper limit switch on a tower crane?
A.To cut off hoisting motion before the hook block collides with the trolley or jib structure (over-hoisting).
B.To stop the trolley from traveling outward past the jib tip.
C.To automatically disengage the main power generator.
D.To prevent the operator from slewing left.
Explanation: The hoist upper limit switch stops the hoist winch before the hook block makes physical contact with the trolley or jib head sheaves, preventing two-blocking (over-hoisting) rope failure.
10Before erecting or telescoping a tower crane, what weather factor must be checked against the erection manual?
A.Maximum allowable wind speed for erection/climbing operations.
B.Relative humidity.
C.Ambient air pressure in millibars.
D.Cloud cover percentage.
Explanation: Erection, dismantling, and mast telescoping have lower maximum allowable wind speed thresholds (often 20–25 mph depending on manufacturer specs) than standard operating limits.

About the CPCS A04 Tower Crane Exam

The UK CPCS A04 Tower Crane certification assesses an operator's technical knowledge of tower crane mechanics, safe lifting operations, safety devices, wind limitations, weather-vanning, and emergency controls in compliance with BS 7121-5 and UK HSE regulations.

Questions

50 scored questions

Time Limit

60 minutes

Passing Score

80%

Exam Fee

£150 (NOCN Construction Plant Competence Scheme (CPCS))

CPCS A04 Tower Crane Exam Content Outline

15%

Tower Crane Types & Configurations

Saddle/trolley jibs, luffing jibs, self-erecting cranes, and site configuration selection criteria.

15%

Base Anchorage & Ballast Systems

Foundation anchors, ballast blocks, counter-weights, and ground bearing pressure calculations.

15%

Rated Capacity & Moment Limiters

RCI/RCL systems, moment limiters, limit switches, and load radius calculations.

15%

Wind Limits & Weather Safety

In-service wind speeds, gust factors, anemometer monitoring, and out-of-service storm ratings.

15%

Weather-Vanning Procedures

Slew brake release mechanisms, parking radius, free-slewing alignment, and out-of-service securing.

15%

Blind Lifting & Radio Signalling

BS 7121-5 communication protocols, hand signals, radio relay, and clear-line-of-sight safety.

10%

Climb, Erection & Emergency lowering

Telescoping cages, tie-ins, pre-use daily checks, emergency brake release, and defect reporting.

How to Pass the CPCS A04 Tower Crane Exam

What You Need to Know

  • Passing score: 80%
  • Exam length: 50 questions
  • Time limit: 60 minutes
  • Exam fee: £150

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

CPCS A04 Tower Crane Study Tips from Top Performers

1Memorize standard UK in-service wind speed limits (typically 38 km/h or 20 knots, subject to manufacturer specifications).
2Understand why slew brakes must NEVER be locked in out-of-service storm conditions unless specifically instructed for a non-weathervanning tie configuration.
3Review the exact functions of Rated Capacity Indicators (RCI) versus Rated Capacity Limiters (RCL).
4Familiarize yourself with BS 7121-5 hand and radio signals for blind lifting operations.

Frequently Asked Questions

What is the CPCS A04 Tower Crane qualification?

It is the UK industry-standard certification for operating tower cranes on construction and civil engineering sites under the NOCN CPCS card scheme.

What is the difference between a saddle jib and a luffing jib tower crane?

A saddle jib (trolley jib) keeps its horizontal boom fixed while a trolley travels along it to adjust radius. A luffing jib raises and lowers the entire jib to change operating radius, allowing operations in tight spaces with adjacent tall structures.

Why is weather-vanning mandatory for tower cranes when left out of service?

Weather-vanning allows the crane jib to rotate freely like a wind vane with the prevailing wind, drastically reducing wind resistance on the structure and preventing catastrophic structural collapse.