Mobile Crane Exam Prep | Verified Questions and 100% Correct Answers | Latest 2025/2026 Update

Mobile Crane Exam Prep | Verified
Questions and 100% Correct Answers |
Latest 2025/2026 Update

Question 1 Who has the final say whether a lift is safe or not? Answer: The crane operator
Rationale: Even if the boss says ―do it,‖ the operator can refuse if it feels unsafe.

Question 2 Default safe distance from power lines up to 50 kV? Answer: 10 feet Rationale:
Simple rule everyone remembers when voltage is unknown.

Question 3 Lines over 350 kV but under 500 kV need how far? Answer: 25 feet Rationale: The
higher the voltage, the bigger the danger circle.

Question 4 If you might get within 20 feet of any line, first thing to do? Answer: Find out the
exact voltage Rationale: You can’t pick the right distance until you know how hot the line is.

Question 5 Max wind speed when lifting people in a basket? Answer: 20 mph Rationale: Faster
than that and the basket swings too much — people get hurt.

Question 6 What does the anti-two-block stop? Answer: Hook block crashing into the boom
tip Rationale: That crash can snap the rope or bend the boom.

Question 7 How often do you walk around and inspect the crane? Answer: Every shift before
you start Rationale: Something could have broken overnight.

Question 8 Load charts are built so the crane starts to tip at what %? Answer: 75% on tires,
85% on crawlers Rationale: That extra 15–25% is your safety cushion.

Question 9 To know the real weight you can pick, you must subtract: Answer: Hook block,
slings, shackles — everything hanging Rationale: The chart includes all that weight — you
only want the load itself.

Question 10 Dangerous area where the counterweight swings? Answer: Tail swing / swing
radius Rationale: Most people get crushed right there.

Question 11 Emergency stop hand signal? Answer: Both arms out, fast waving side to side

Question 12 Dog everything (stop everything now) signal? Answer: Clenched fist in front of
chest

, Question 13 Normal load rope must be how many times stronger than the load? Answer: 3.5
times

Question 14 Rotation-resistant boom hoist rope needs to be: Answer: 5 times stronger

Question 15 How many broken wires in one section = replace rope? Answer: 6 random or 3 in
one strand

Question 16 Rope worn how much thinner = replace? Answer: 6% thinner than new

Question 17 Is dragging a load with the crane ever allowed? Answer: Never

Question 18 How many wraps must always stay on the drum? Answer: 2 full wraps

Question 19 Weakest direction on most truck cranes? Answer: Over the side

Question 20 Safest spot for the signal person? Answer: Outside the angle of the slings

Question 21 Three must-haves before lifting people? Answer: Trial lift, written plan, working
anti-two-block

Question 22 Can you swing a load over workers? Answer: Never

Question 23 Best way to move a load sideways? Answer: Boom up a little and swing

Question 24 LMI hits 100% — what now? Answer: Stop everything

Question 25 LMI broken — can you still lift? Answer: Only with boss’s written OK and very
light loads

Question 26 Who is allowed to give hand signals? Answer: Only a trained signal person

Question 27 Max ground slope most cranes can sit on? Answer: 1% (1 ft drop in 100 ft)

Question 28 Bird-caged rope means: Answer: It was shock-loaded or dropped suddenly

Question 29 Kinked rope: Answer: Trash it — never use again

Question 30 Load line touches the ground while lifting? Answer: Stop immediately — you’re
side-loading the boom

Question 31 Traveling with a load on a truck crane — boom goes: Answer: Over the front (or
where the book says)

Question 32 Range diagram tells you: Answer: How far out you are for any boom length and
angle