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PMEK — MARINE ELECTRICAL
PRACTICAL MARINE ELECTRICAL KNOWLEDGE
2026-2027 UPDATE EXAM
Actual Questions and Answers
100% Guarantee Pass
This Exam contains:
> 42 Questions and Answers
> 100% Guarantee Pass
> Chapter-by-Chapter Technical Review
> Each Question Includes The Correct Answer
> Expert-Verified Explanation
PASS
100%
GUARANTEED
, PRACTICAL MARINE ELECTRICAL KNOWLEDGE — 2026-2027 UPDATE EXAM
CHAPTER ONE: SHIPS' ELECTRICAL SYSTEMS, SAFETY & MAINTENANCE
Question 1
Why should the measurement of the insulation resistance of an electrical machine ideally be made while
the machine is hot?
Correct answer ✔✔ Insulation resistance decreases with increase of temperature. Measuring the
insulation resistance while the machine is hot gives the true minimum insulation value under actual
operating conditions.
Question 2
What action should be taken if difficulties arise in locating an electrical fault on an item of equipment
and only a wiring diagram is available?
Correct answer ✔✔ Convert the wiring diagram into a much simpler and more useful circuit diagram.
Follow standard conventions: draw sequences from left to right and top to bottom in order of occurrence,
align components operating at bus-bar voltage, and show all contacts in their normal or de-energised
condition.
CHAPTER TWO: ELECTRICAL DISTRIBUTION
Question 3
A 10 A motor operates from a 220 V insulated system. The supply cables have a total impedance of 0.01
Ω. Calculate the circuit current if: (a) an open-circuit fault, (b) an earth fault, and (c) a short-circuit fault
occurs.
Correct answer ✔✔ (a) Open-circuit fault: Infinite impedance, so I = V / Z = 220 V / ∞ Ω = ZERO.
(b) Earth fault: Has NO effect on circuit current in an insulated system, so I remains at 10 A.
(c) Short-circuit fault: Impedance is limited only by cable impedance (0.01 Ω), so I_sc = V / Z = 220 V /
0.01 Ω = 22,000 A (22 kA)!
Page 2
Download
PMEK — MARINE ELECTRICAL
PRACTICAL MARINE ELECTRICAL KNOWLEDGE
2026-2027 UPDATE EXAM
Actual Questions and Answers
100% Guarantee Pass
This Exam contains:
> 42 Questions and Answers
> 100% Guarantee Pass
> Chapter-by-Chapter Technical Review
> Each Question Includes The Correct Answer
> Expert-Verified Explanation
PASS
100%
GUARANTEED
, PRACTICAL MARINE ELECTRICAL KNOWLEDGE — 2026-2027 UPDATE EXAM
CHAPTER ONE: SHIPS' ELECTRICAL SYSTEMS, SAFETY & MAINTENANCE
Question 1
Why should the measurement of the insulation resistance of an electrical machine ideally be made while
the machine is hot?
Correct answer ✔✔ Insulation resistance decreases with increase of temperature. Measuring the
insulation resistance while the machine is hot gives the true minimum insulation value under actual
operating conditions.
Question 2
What action should be taken if difficulties arise in locating an electrical fault on an item of equipment
and only a wiring diagram is available?
Correct answer ✔✔ Convert the wiring diagram into a much simpler and more useful circuit diagram.
Follow standard conventions: draw sequences from left to right and top to bottom in order of occurrence,
align components operating at bus-bar voltage, and show all contacts in their normal or de-energised
condition.
CHAPTER TWO: ELECTRICAL DISTRIBUTION
Question 3
A 10 A motor operates from a 220 V insulated system. The supply cables have a total impedance of 0.01
Ω. Calculate the circuit current if: (a) an open-circuit fault, (b) an earth fault, and (c) a short-circuit fault
occurs.
Correct answer ✔✔ (a) Open-circuit fault: Infinite impedance, so I = V / Z = 220 V / ∞ Ω = ZERO.
(b) Earth fault: Has NO effect on circuit current in an insulated system, so I remains at 10 A.
(c) Short-circuit fault: Impedance is limited only by cable impedance (0.01 Ω), so I_sc = V / Z = 220 V /
0.01 Ω = 22,000 A (22 kA)!
Page 2
