100+ Free GCC Mines & Works Plant Engineering Exam Practice Questions

Prepare for the GCC Mines & Works Engineer — Plant Engineering Examination (South Africa) exam with instant access — no signup required.

✓ No registration✓ No credit card✓ No hidden fees✓ Start practicing immediately

100+ Questions

100% Free

Loading practice questions...

Same family resources

Explore More South Africa Government Certificate of Competency (GCC)

Continue into nearby exams from the same family. Each card keeps practice questions, study guides, flashcards, videos, and articles in one place.

Sample GCC Mines & Works Plant Engineering Exam Practice Questions

Try these sample questions to test your GCC Mines & Works Plant Engineering Exam exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A deep-level gold mine shaft uses a single-drum cylindrical winder to lift rock from a depth of 1,800 m. The steel wire rope has a mass of 8.5 kg/m and the suspended skip empty mass is 6,000 kg. If the maximum payload of rock per trip is 10,000 kg, calculate the static safety factor of the rope at the headgear sheave when the loaded skip is at the bottom of the shaft, assuming a nominal rope breaking force of 2,400 kN. (Take g = 9.81 m/s²).

A.7.82

B.8.50

C.6.56

D.9.21

Explanation: 1. Suspended rope mass = 1,800 m × 8.5 kg/m = 15,300 kg. 2. Total suspended mass at sheave = 15,300 kg (rope) + 6,000 kg (skip) + 10,000 kg (payload) = 31,300 kg. 3. Total static load force = 31,300 kg × 9.81 m/s² = 307,053 N = 307.05 kN. 4. Static Safety Factor = Breaking Force / Static Load = 2,400 kN / 307.05 kN = 7.816 ≈ 7.82.

2According to South African Mine Health and Safety Act regulations for rock winding in a vertical shaft, what is the minimum permitted static safety factor (S) for a new winding rope at the headgear sheave for a suspended rope length of L = 2,000 m, using the standard formula S = 8.5 - 0.001 × L (subject to absolute minimum limits)?

A.6.50

B.8.50

C.5.00

D.4.50

Explanation: 1. Formula for rock winding static safety factor: S = 8.5 - 0.001 × L. 2. Substitute L = 2,000 m: S = 8.5 - (0.001 × 2,000) = 8.5 - 2.0 = 6.50. 3. Since 6.50 exceeds the statutory minimum limit of 4.5, the minimum required static safety factor is 6.50.

3A Koepe (friction) winder has a drum angle of wrap θ = 190° (3.316 rad) and the friction coefficient between the steel rope and the polyurethane lining is μ = 0.25. Calculate the maximum static tension ratio (T1/T2) before rope slip occurs across the friction wheel.

A.2.29

B.1.85

C.3.12

D.4.75

Explanation: 1. The limiting ratio of rope tensions for friction winders is given by Eytelwein's formula: T1/T2 = e^(μ × θ). 2. Convert angle of wrap to radians: θ = 190° × (π / 180°) = 3.3161 rad. 3. Exponent product = μ × θ = 0.25 × 3.3161 = 0.8290. 4. Limiting tension ratio T1/T2 = e^(0.8290) = 2.291 ≈ 2.29.

4A double-drum winder has a drum width of 2.4 m and is positioned at a horizontal distance of 45 m from the headgear sheave wheel centerline. Calculate the maximum fleet angle when the rope is at the extreme outer flange of the drum.

A.1.53°

B.3.05°

C.0.76°

D.2.45°

Explanation: 1. Half width of drum (distance from drum center to flange) = 2.4 m / 2 = 1.2 m. 2. Fleet angle α is calculated as tan(α) = (Half drum width) / (Distance to sheave) = 1.2 m / 45 m = 0.02667. 3. α = arctan(0.02667) = 1.528° ≈ 1.53°. Note: This is right at the standard engineering maximum limit of 1.5° to prevent rope scrubbing.

5A cylindrical drum winder has a total equivalent moment of inertia of 120,000 kg·m² at the drum shaft. The drum diameter is 4.5 m. If the winder accelerates the conveyances at a rate of 1.2 m/s², calculate the torque required at the drum shaft strictly to overcome rotational acceleration.

A.64.0 kN·m

B.128.0 kN·m

C.32.0 kN·m

D.270.0 kN·m

Explanation: 1. Drum radius R = 4.5 m / 2 = 2.25 m. 2. Angular acceleration α = linear acceleration / radius = 1.2 m/s² / 2.25 m = 0.5333 rad/s². 3. Acceleration torque T_acc = I × α = 120,000 kg·m² × 0.5333 rad/s² = 64,000 N·m = 64.0 kN·m.

6Under South African DMRE regulations, what is the minimum required braking torque capacity for mechanical emergency brakes on a rock-winding drum engine relative to the maximum static out-of-balance torque?

A.2.0 times maximum out-of-balance static torque

B.1.5 times maximum out-of-balance static torque

C.1.0 times maximum out-of-balance static torque

D.3.0 times maximum out-of-balance static torque

Explanation: DMRE regulations specify that the mechanical braking system of a winding engine must be capable of holding the conveyance under maximum out-of-balance conditions with a safety factor, producing a braking torque of at least 2.0 times the maximum static out-of-balance torque.

7What primary safety function does an Ormerod or King type detaching hook serve in a vertical mine shaft headgear?

A.It detaches the winding rope from the conveyance during an overwind and suspends the conveyance on catch bells/plates.

B.It automatically releases the skip payload into the headgear bin when reaching the surface bank.

C.It absorbs shock loads caused by emergency braking at the shaft bottom.

D.It balances rope tension in multi-rope Koepe friction winding installations.

Explanation: A detaching hook (such as Ormerod or King design) is designed to open when pulled through a copper/steel catch plate in the headgear during an overwind. It releases the winding rope to prevent it breaking and simultaneously locks into the catch plate, holding the conveyance safely suspended.

8A skip carrying 12,000 kg of ore has a skip mass of 7,000 kg and suspended rope mass of 10,000 kg. If the winder accelerates upward at 1.8 m/s², calculate the dynamic tension load on the rope at the sheave and the corresponding dynamic safety factor if rope breaking force is 3,200 kN. (g = 9.81 m/s²).

A.Dynamic load = 336.7 kN, Dynamic Safety Factor = 9.50

B.Dynamic load = 284.5 kN, Dynamic Safety Factor = 11.25

C.Dynamic load = 388.2 kN, Dynamic Safety Factor = 8.24

D.Dynamic load = 420.0 kN, Dynamic Safety Factor = 7.62

Explanation: 1. Total suspended mass M = 12,000 kg + 7,000 kg + 10,000 kg = 29,000 kg. 2. Total upward acceleration = g + a = 9.81 m/s² + 1.8 m/s² = 11.61 m/s². 3. Dynamic tension load F_dyn = 29,000 kg × 11.61 m/s² = 336,690 N = 336.69 kN ≈ 336.7 kN. 4. Dynamic Safety Factor = Breaking Force / Dynamic Load = 3,200 kN / 336.69 kN = 9.504 ≈ 9.50.

9What is the key mechanical advantage of a bi-cylindro-conical (BCC) winder drum compared to a plain cylindrical drum in deep-shaft winding?

A.It reduces peak motor torque during initial acceleration by starting winding on the small diameter while unwinding off the large diameter.

B.It eliminates the need for brake paths on the winder drum sides.

C.It allows rope fleet angles exceeding 5 degrees without rope wear.

D.It increases maximum winding velocity by a factor of three during mid-wind.

Explanation: Bi-cylindro-conical (BCC) drums feature small end drums connected via scroll cones to a large center drum. Starting the wind of the loaded conveyance on the small diameter minimizes the torque required during acceleration, while the descending empty conveyance unwinds from the large diameter, balancing peak power requirements.

10In deep vertical shafts, fixed steel guide systems (top-hat or rectangular sections) are often preferred over rope guides under which of the following operating conditions?

A.High winding speeds (> 15 m/s) with small shaft clearances between conveyances.

B.Ultra-deep shafts (> 2,500 m) where rope guide weight becomes negligible.

C.Shafts with high seismic ground movement where rigid steel guides never deform.

D.Installations where initial capital cost must be minimized.

Explanation: Fixed steel guide systems provide rigid positioning and tight tolerance tracking, preventing conveyance sway and collision when operating at high winding speeds (> 15 m/s) in shafts with small clearances.

About the GCC Mines & Works Plant Engineering Exam Exam

The GCC Mines & Works Plant Engineering Examination evaluates an engineer's technical ability to manage, maintain, and operate heavy mining plant and machinery under the MHSA. It covers mine winding installations, drum and Koepe winder calculations, high-voltage mine power distribution, flameproof gear, multi-stage mine pumps, underground ventilation fans, compressed air plants, and ore handling equipment.

Assessment

Technical 3-hour written examination (100 marks) administered by the DMRE Commission of Examiners. Tests candidate mechanical and electrical engineers on mine winding plant design, shaft mechanics, high-voltage mine electrical reticulation, high-head dewatering pumps, mine ventilation fans, compressed air plants, and mineral processing machinery.

Time Limit

3 hours (180 minutes)

Passing Score

50% minimum passing mark on the written paper

Exam Fee

R300 examination fee; confirm exact amount on the DMRE application form (Department of Mineral Resources and Energy (DMRE) — Commission of Examiners for Engineers' Certificates of Competency)

GCC Mines & Works Plant Engineering Exam Exam Content Outline

25%

Mine Winding Installations & Shaft Mechanics

Drum and Koepe winder dynamics, static and dynamic rope safety factors, braking torque, headgear sheaves, shaft guides, and skip payloads.

25%

Electrical Distribution & Heavy Mining Equipment

HV mine reticulation, underground substations, flameproof switchgear, motor starting methods, earth fault relays, and trailing cables.

20%

Mine Pumping, Dewatering & Hydraulics

High-head multi-stage centrifugal pumps, settler sizing, acid mine drainage pumping, hydraulic roof supports, and pipe column friction.

15%

Mine Ventilation Equipment & Compressed Air Plants

Surface main fan pressure-volume curves, auxiliary fans, multi-stage air compressors, air distribution networks, and refrigeration plants.

15%

Materials Handling, Mineral Processing & Safety

Heavy-duty conveyor belt power calculations, primary crushers, ball mills, safety interlocks, and preventive maintenance systems.

How to Pass the GCC Mines & Works Plant Engineering Exam Exam

What You Need to Know

Passing score: 50% minimum passing mark on the written paper
Assessment: Technical 3-hour written examination (100 marks) administered by the DMRE Commission of Examiners. Tests candidate mechanical and electrical engineers on mine winding plant design, shaft mechanics, high-voltage mine electrical reticulation, high-head dewatering pumps, mine ventilation fans, compressed air plants, and mineral processing machinery.
Time limit: 3 hours (180 minutes)
Exam fee: R300 examination fee; confirm exact amount on the DMRE application form

Keys to Passing

Work through all 100 available questions
Review every answer and explanation
Track weak areas and revisit them
Use our AI tutor for tough concepts

GCC Mines & Works Plant Engineering Exam Study Tips from Top Performers

1Master drum winder and Koepe winder calculations: static rope safety factor formulas, payload ratios, motor RMS power, and brake torque.

2Understand high-voltage underground distribution: 6.6 kV and 11 kV switchgear, earth fault protection schemes, and flameproof enclosure (Ex d) requirements.

3Practice multi-stage centrifugal pump calculations: Total Dynamic Head (TDH), power input, NPSH available, and parallel/series pump operations.

4Review surface main ventilation fan operating points, fan characteristic curves, system resistance curves, and mine cooling plant refrigeration cycles.

Frequently Asked Questions

What is covered in the GCC Mines & Works Plant Engineering exam?

The exam covers mine winding engines, rope dynamics, shaft equipment, high-voltage electrical distribution underground, flameproof switchgear, dewatering pumps, main surface fans, air compressors, and mineral processing plant.

Are winder calculation problems included in the exam?

Yes, candidates must solve numerical calculations on winding rope safety factors, acceleration torque, drum diameter, payload capacity, and braking power.

What pass mark is required for GCC Mines Plant Engineering?

The minimum passing score is 50% on the 100-mark written paper.

Do both electrical and mechanical engineers write this paper?

Yes, the GCC Mines & Works Plant Engineering paper tests both mechanical and electrical mine plant engineering topics.