Which type of wire rope is best suited for winding operations in deep vertical shafts?
Analysis & Theory
Ordinary lay ropes are preferred for winding due to better spoolability and resistance to rotation.
Which rope is ideal for applications requiring high flexibility, such as cranes and dredging?
Analysis & Theory
6x37 ropes are more flexible due to the higher number of thinner wires.
Which wire rope is suitable for aerial ropeways?
Analysis & Theory
Locked coil ropes provide a smooth outer surface and are suitable for aerial ropeway use.
Which rope is used in haulage systems where resistance to abrasion is crucial?
D
Filler wire construction
Analysis & Theory
Lang lay ropes have wires aligned with the rope axis, increasing abrasion resistance.
What is a major cause of wire rope failure in corrosive environments?
Analysis & Theory
Rusting reduces wire cross-section and fatigue strength, leading to failure.
Which environmental factor accelerates wire rope deterioration most?
Analysis & Theory
Moisture and chemicals cause corrosion, significantly degrading rope performance.
Overwinding during operation can lead to:
Analysis & Theory
Overwinding results in kinks and deformations that reduce rope strength.
Improper drum grooving primarily causes:
B
Uneven wear and rope crushing
Analysis & Theory
Poorly grooved drums create pressure points leading to localized wear and crushing.
Which is a mechanical cause of rope deterioration?
B
Abrasion due to misalignment
Analysis & Theory
Mechanical abrasion from contact with sharp or misaligned surfaces wears down wires.
Which is an early warning sign of internal wire rope deterioration?
C
Rust-colored powder near strands
D
Increased rope diameter
Analysis & Theory
Rust-colored powder is a typical sign of internal corrosion and strand fatigue.
Why is regular lubrication necessary for wire ropes?
A
To reduce load capacity
C
To reduce internal friction and corrosion
Analysis & Theory
Lubrication reduces internal friction and corrosion, extending rope life.
Which of the following helps in minimizing rope deterioration?
B
Avoiding pre-tensioning
C
Proper sheave alignment and size
D
Allowing overloading occasionally
Analysis & Theory
Correct sheave diameter and alignment reduce bending and uneven loading.
To avoid kinking during installation, the rope should be:
B
Spiraled from the side of the coil
C
Uncoiled properly without twisting
D
Unwound while rotating the reel fast
Analysis & Theory
Proper uncoiling without twisting ensures the rope remains straight and kink-free.
Which of the following is a preventive measure for wire rope deterioration?
A
Using smaller diameter pulleys
B
Increasing hoisting speed
C
Applying correct lubrication regularly
Analysis & Theory
Regular lubrication and inspection help prevent early rope failure.
Wire rope discard criteria generally include:
A
Number of broken outer wires
Analysis & Theory
All of these are considered in determining whether a rope should be retired.
What precaution should be taken during rope storage?
B
Store in acidic environment
C
Store dry and clean on wooden racks
Analysis & Theory
Dry and clean storage on racks prevents rust and mechanical damage.
Why should a wire rope never be shock-loaded?
B
It increases wear resistance
C
It may cause instantaneous failure
D
It improves tensile strength
Analysis & Theory
Shock loading can cause immediate failure due to sudden force application.
Which of the following is a precaution during wire rope installation?
B
Twist the rope manually
C
Ensure proper drum winding direction
D
Pull rope over sharp corners
Analysis & Theory
Correct winding direction prevents unwinding and maintains rope integrity.
For haulage in inclines, which lay is preferred?
Analysis & Theory
Ordinary lay ropes are preferred due to their resistance to rotation and kinking.
How often should wire ropes be inspected in mining operations?
C
At regular intervals as per regulations
Analysis & Theory
Frequent inspection ensures timely detection of wear and compliance with safety norms.