DC Hoisting Engineer Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. A hoisting engineer is operating a mobile crane with a rated capacity of
20 tons at a 30-foot radius. The load weighs 18 tons, but the radius
increases to 40 feet during the lift. What is the most appropriate
action?
A. Continue the lift since the load is below rated capacity
B. Increase boom angle to stabilize the crane without stopping
C. Stop the lift and reevaluate load chart limits for the new radius
D. Add counterweights while continuing the lift
Increasing the operating radius reduces crane capacity significantly, and
exceeding load chart limits creates an immediate tipping hazard requiring
the lift to be stopped and reassessed.
2. Which principle most directly governs the stability of a crane during
lifting operations?
A. Pascal’s Law
B. Bernoulli’s Principle
C. Center of gravity and load moment relationship
D. Ohm’s Law
,Crane stability is primarily determined by the relationship between the
center of gravity and the load moment, which affects tipping risk.
3. What is the primary purpose of a crane load chart?
A. To identify fuel consumption rates
B. To determine maintenance intervals
C. To specify safe lifting capacities at various configurations
D. To list manufacturer warranty conditions
Load charts define safe operating limits based on boom length, radius, and
configuration to prevent overloading.
4. When using wire ropes, which defect requires immediate removal
from service?
A. Slight surface rust
B. Minor lubrication loss
C. Broken wire strands exceeding allowable limits
D. Slight discoloration
Broken wire strands indicate structural compromise in the rope, making
continued use unsafe.
5. What is the most critical factor when selecting rigging hardware?
A. Color coding of equipment
B. Manufacturer branding
C. Working load limit (WLL) relative to expected load
D. Paint condition
Rigging hardware must always be selected based on WLL to ensure it can
safely support the applied load.
6. A crane operator hears a sudden grinding noise during hoisting. What
is the correct response?
, A. Increase hoisting speed to clear obstruction
B. Continue until load is placed
C. Stop operation immediately and investigate the source of the noise
D. Reduce counterweight and proceed
Unusual mechanical noises indicate possible equipment failure and require
immediate shutdown for safety.
7. Which device is used to prevent a crane from exceeding its rated
capacity?
A. Anemometer
B. Tachometer
C. Load moment indicator (LMI)
D. Altimeter
A load moment indicator monitors load and radius to prevent exceeding
safe operating limits.
8. What is the safest method for lifting an uneven load?
A. Single-point vertical lift
B. Increase hoisting speed
C. Use properly balanced multi-leg sling configuration
D. Reduce sling capacity below load weight
Balanced multi-leg slings distribute weight evenly, reducing instability
during lifts.
9. Which condition most increases the risk of crane overturning?
A. Low ambient temperature
B. Smooth ground surface
C. Operating with extended boom at high radius
D. Using certified slings
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. A hoisting engineer is operating a mobile crane with a rated capacity of
20 tons at a 30-foot radius. The load weighs 18 tons, but the radius
increases to 40 feet during the lift. What is the most appropriate
action?
A. Continue the lift since the load is below rated capacity
B. Increase boom angle to stabilize the crane without stopping
C. Stop the lift and reevaluate load chart limits for the new radius
D. Add counterweights while continuing the lift
Increasing the operating radius reduces crane capacity significantly, and
exceeding load chart limits creates an immediate tipping hazard requiring
the lift to be stopped and reassessed.
2. Which principle most directly governs the stability of a crane during
lifting operations?
A. Pascal’s Law
B. Bernoulli’s Principle
C. Center of gravity and load moment relationship
D. Ohm’s Law
,Crane stability is primarily determined by the relationship between the
center of gravity and the load moment, which affects tipping risk.
3. What is the primary purpose of a crane load chart?
A. To identify fuel consumption rates
B. To determine maintenance intervals
C. To specify safe lifting capacities at various configurations
D. To list manufacturer warranty conditions
Load charts define safe operating limits based on boom length, radius, and
configuration to prevent overloading.
4. When using wire ropes, which defect requires immediate removal
from service?
A. Slight surface rust
B. Minor lubrication loss
C. Broken wire strands exceeding allowable limits
D. Slight discoloration
Broken wire strands indicate structural compromise in the rope, making
continued use unsafe.
5. What is the most critical factor when selecting rigging hardware?
A. Color coding of equipment
B. Manufacturer branding
C. Working load limit (WLL) relative to expected load
D. Paint condition
Rigging hardware must always be selected based on WLL to ensure it can
safely support the applied load.
6. A crane operator hears a sudden grinding noise during hoisting. What
is the correct response?
, A. Increase hoisting speed to clear obstruction
B. Continue until load is placed
C. Stop operation immediately and investigate the source of the noise
D. Reduce counterweight and proceed
Unusual mechanical noises indicate possible equipment failure and require
immediate shutdown for safety.
7. Which device is used to prevent a crane from exceeding its rated
capacity?
A. Anemometer
B. Tachometer
C. Load moment indicator (LMI)
D. Altimeter
A load moment indicator monitors load and radius to prevent exceeding
safe operating limits.
8. What is the safest method for lifting an uneven load?
A. Single-point vertical lift
B. Increase hoisting speed
C. Use properly balanced multi-leg sling configuration
D. Reduce sling capacity below load weight
Balanced multi-leg slings distribute weight evenly, reducing instability
during lifts.
9. Which condition most increases the risk of crane overturning?
A. Low ambient temperature
B. Smooth ground surface
C. Operating with extended boom at high radius
D. Using certified slings
