Ship Electrical Distribution Quiz

What is an advantage of closed-loop distribution?

• Cheaper installation

• Easy maintenance

• Less cable required

• Ability to operate even if one cable fails

Why do ports often require ships to use shore power instead of onboard generators?

• To reduce fuel costs

• To minimize air and noise pollution in port areas

• To save generator life

• To increase efficiency

Essential services in ship electrical distribution include:

• Cargo pumps and lighting

• Air conditioning and refrigeration

• Steering gear and navigation aids

• Galley equipment

In Engine Room Simulator (ERS) KONGSBERG MAN B&W MC90-V Electrical Distribution System. Which is the Main Directory for the Emergency Switchboard?

• MD 70

• MD 71

• MD 72

• MD 73

Normal voltage at a ship's main AC switchboard is usually:

• 220 V

• 440 V

• 380 V

• 660 V

Which AC distribution device combines the functions of fuse and circuit breaker for small loads up to 100 A?

• Cartridge fuse

• Isolator switch

• Miniature circuit breaker (MCB)

• Earth leakage relay

If a generator supplies 400 kVA at 0.9 power factor lagging, what is the real power in kW?

• 400 kW

• 360 kW

• 380 kW

• 450 kW

An insulated distribution system is one that is totally electrically insulated from earth (ship's hull)

• Earthed system

• Insulated system

• Parallel system

• Ring system

Which distribution system is commonly used to supply winches and cranes?

• Radial system

• Ring system

• Insulated system

• Parallel system

In earth lamp indication for DC systems, both lamps glow equally if:

• One earth fault exists

• There is no fault and insulation is intact

• One lamp is open

• Short circuit exists