HV Exit Exam • Set 3 Question 6 of 30

What is the Polarisation Index (PI) in insulation resistance testing?

✓

Direct Answer

Option A: Ratio of 10-minute insulation resistance to 1-minute insulation resistance

Polarisation Index (PI) is defined as the ratio of insulation resistance measured at 10 minutes to the insulation resistance measured at 1 minute (R10 / R1). A PI value above 2.0 indicates clean, dry insulation.

All Options

Ratio of 10-minute insulation resistance to 1-minute insulation resistance (Correct Answer)

Ratio of 1-minute insulation resistance to 10-minute insulation resistance

Ratio of 5-minute insulation resistance to 25-minute insulation resistance

Ratio of test voltage to leakage current after 1 minute

Detailed Explanation & Context

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).

Practice Full HV Set 3

Test yourself with 30 interactive questions, live timer, and instant score.

Launch Practice Simulator →

Question Discussion & Notes

Have a doubt, memory trick, or exam update? Share your insights with fellow mariners.

Loading mariner discussions...

« Previous Question Next Question »

More Questions in HV Set 3

View All 30 →

Q1 Which document contains the shipyard's description of operations regarding the vessel's High Voltage (HV) equipment? Q2 The induced voltage across a stationary conductor in a steady magnetic field is zero. Q3 A low voltage protection circuit is used in electric motor starting equipment to: Q4 In air blast circuit breakers, the compressed air pressure used for arc quenching is in the order of: Q5 What is the primary means by which an electrical maintenance worker is protected from electrical hazards while performing work on an electrical circuit? Q6 What is the Polarisation Index (PI) in insulation resistance testing? Q7 The direction of mechanical force experienced by a current-carrying conductor placed in a magnetic field is determined by: Q8 Which of the following insulating media can be used in sphere gaps and high-voltage test setups? Q9 Cartridge and rewireable fuse protection in general distribution circuits is typically used for continuous current ratings up to: Q10 A high voltage circuit must be de-energized and grounded with a grounding stick before touching it or leaving it unattended and exposed.