CPCS Crane Operations and Signals

Question 1

In the UK standard crane signalling system, what does the signal of one arm extended horizontally with the palm facing down, moved up and down, indicate?

Accepted Answer

Lower the load

Answer

In the standard UK crane signals (as defined in BS 7121), an arm extended horizontally with the palm facing down, moved repeatedly up and down, is the signal for 'Lower'. The signal must be clear, deliberate, and given by the appointed slinger/signaller.

Question 2

What is the maximum number of appointed signallers who should communicate with a crane operator at any one time?

Accepted Answer

One

Answer

Only one appointed signaller should communicate with the crane operator at any one time to prevent confusion. If the crane needs to be directed by a different person, a formal handover of signalling duties must take place.

Question 3

Under BS 7121, what must happen before any lifting operation with a crane commences?

Accepted Answer

A lift plan must be prepared by a competent person

Answer

BS 7121 and LOLER 1998 require that every lifting operation is properly planned by a competent person. The lift plan must assess the load weight, ground conditions, radius, environmental factors, and identify suitable equipment and exclusion zones.

Question 4

What does the term 'radius' mean in crane operations?

Accepted Answer

The horizontal distance from the crane's centre of rotation to the load

Answer

The radius is the horizontal distance from the centre of the crane's slew ring to the centre of the load being lifted. As the radius increases, the crane's safe working load (SWL) decreases. Operators must always check the load chart for the relevant radius.

Question 5

What is the emergency stop signal used in UK crane operations?

Accepted Answer

Both arms extended horizontally, then moved rapidly inward and crossed

Answer

The emergency stop signal involves both arms extended horizontally, palms facing forward, then moved inward and crossed above the head. This signal means all crane movements must cease immediately. Any person on site can give this signal.

CPCS Theory Practice Test

CPCS Theory Practice Test

CPCS Crane Operations and Signals