CPCS A04 Tower Crane Practice Questions - CPCS A04 Crane Lifting Operations - Tower Crane (NOCN CPCS, UK) Exam - CPCS A04 Tower Crane Practice Questions - CPCS A04 Crane Lifting Operations

Question 1

What is the principal operational difference between a trolley (saddle) jib tower crane and a luffing jib tower crane?

A trolley jib stays horizontal while a trolley moves the hook; a luffing jib raises and lowers the entire jib to alter hook radius. A trolley jib can rotate 360 degrees, whereas a luffing jib is fixed in slew direction. A luffing jib has no hoist rope and uses hydraulic cylinders directly to lift loads. A trolley jib can only be mounted on traveling bases, while a luffing jib must be static.

Correct Answer:

A trolley jib stays horizontal while a trolley moves the hook; a luffing jib raises and lowers the entire jib to alter hook radius.

Question 2

Why are luffing jib tower cranes predominantly selected for congested urban construction sites?

They can operate at high jib angles to clear adjacent oversailing restrictions and tall neighbouring buildings. They require zero counter-ballast weight at the rear of the slewing upper structure. They are immune to high wind speeds and never require weather-vanning. They can lift double their maximum rated capacity compared to trolley jib cranes.

Correct Answer:

They can operate at high jib angles to clear adjacent oversailing restrictions and tall neighbouring buildings.

Question 3

What is the primary function of central ballast ballast blocks on a bottom-slewing self-erecting tower crane?

To stabilize the non-slewing lower chassis against overturning moments during operation and storm conditions. To provide emergency braking force for the slewing mechanism. To act as a anchor weight for the hoist rope dead-end reeving. To adjust the working height of the telescopic mast during operation.

Correct Answer:

To stabilize the non-slewing lower chassis against overturning moments during operation and storm conditions.

Question 4

Under UK HSE guidance and BS 7121-5, what device must continuously measure and display wind speed to the tower crane operator?

An anemometer fitted at the highest point of the crane (usually tower top or jib tip). A barometric pressure sensor installed inside the operator cab. A strain gauge mounted on the main hoist wire rope. A tachometer attached to the slewing ring pinion.

Correct Answer:

An anemometer fitted at the highest point of the crane (usually tower top or jib tip).

Question 5

What does the term 'weather-vanning' mean when leaving a top-slewing tower crane out of service?

Releasing the slew brake so the jib free-slews and points downwind like a wind vane to minimize wind resistance. Locking the slew brake tightly in the direction of the building under construction. Lowering the hook block onto the ground and tying the jib to scaffolding with steel wire rope. Enclosing the operator cab in protective waterproof canvassing.

Correct Answer:

Releasing the slew brake so the jib free-slews and points downwind like a wind vane to minimize wind resistance.

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About this Exam

Prepare with the CPCS A04 Tower Crane Practice Questions - CPCS A04 Crane Lifting Operations - Tower Crane (NOCN CPCS, UK) Exam practice quiz. This question bank includes 100 questions covering crane, tower, operator, load, and mast. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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CPCS A04 Tower Crane Practice Questions - CPCS A04 Crane Lifting Operations - Tower Crane (NOCN CPCS, UK) Exam

This practice set contains 100 questions from the matching question bank and focuses on crane, tower, operator, load, and mast. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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CPCS A04 Tower Crane Practice Questions - CPCS A04 Crane Lifting Operations - Tower Crane (NOCN CPCS, UK) Exam

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