Work health and safety legislation, duty of care and licence obligations
The duty framework
Every derrick crane operation sits inside a chain of duties. The person conducting a business or undertaking (PCBU) has the primary duty to ensure health and safety so far as is reasonably practicable; officers must exercise due diligence; workers must take reasonable care of themselves and others, follow instructions and report hazards. A derrick crane is high-risk plant, so specific duties attach: competent persons for inspection, registered plant design where required, and a licensed operator for the crane class.
Licence obligations
A high risk work licence is personal and class-specific. You must hold the correct class, carry or be able to produce the licence, and operate only within its scope. Traps in questions: assuming a licence permits any crane; assuming a supervisor can operate without a licence "briefly"; ignoring that the licence can be suspended or cancelled for unsafe conduct, and that you must not operate while impaired by fatigue, drugs or alcohol.
Reasonably practicable and consultation
Questions often test the meaning of "so far as is reasonably practicable" - weighing likelihood and severity of harm against the cost and difficulty of control. Also expect consultation duties: workers and their representatives must be consulted on matters affecting their safety, and you must be able to refuse unsafe work and report incidents.
Worked rule of thumb
If a control is cheap, easy and clearly reduces a serious risk, it is almost certainly required. If a question offers "do nothing because the crane has always been used this way", that is the wrong answer - the duty is ongoing.
Record keeping
Keep inspection, maintenance and pre-start records; they are your evidence of compliance after an incident.