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

Hoist up

Answer

Slew left

Answer

Emergency stop

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

Three

Answer

Two

Answer

As many as needed

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

The crane must be painted in high-visibility colours

Answer

All site workers must leave the area completely

Answer

The crane must be tested to its maximum rated capacity

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 height of the crane's mast

Answer

The length of the crane's boom

Answer

The diameter of the slew ring

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

Waving one arm in a circle above the head

Answer

Pointing at the ground with both hands

Answer

Blowing a whistle three times

Question 6

What is the purpose of a crane's rated capacity indicator (RCI)?

Accepted Answer

To warn the operator when the crane is approaching or exceeding its safe working load

Answer

To count the number of lifts performed per day

Answer

To measure the wind speed on site

Answer

To record the operator's working hours