SYS 04 Part 4

Slow blow fuses are designed to open only:

• on a continued overload, such as a short circuit.

• Overvoltage

• on a increasing of temperature

A transformer with 2400 windings on the primary coil shall give 28 VAC output from the secondary coil when 115 VAC is connected to the primary coil. How many windings are needed on the secondary coil?

• 85 windings.

• 820 windings.

• 585 windings

In an aeroplane utilising a constant frequency AC power supply, DC power is obtained from a:

• static inverter.

• Transformer Rectifier Unit.

• 3 phase current transformer unit

A rectifier is a unit that

• prevents rectified current from occurring in the electrical system.

• transforms one Ac-voltage to a greater / smaller AC-voltage.

• produces a DC output from AC input.

In a split bus power distribution system.

• each generator supplies its own bus and distribution system in normal operation.

• generators are paralleled on connection to the tie bus.

• power is split between 115V AC and 28V DC.

When checking SG of electrolyte of lead acid battery, what should be taken into account?

• Ambient temperature.

• Electrolyte temperature.

• Battery charge.

An AC generator connected to a CSD requires.

• a separate voltage regulator.

• no voltage regulator as the CSD will control generator frequency.

• no voltage regulator as the CSD will control the voltage.

An increase in the speed of a DC generator will cause the voltage to rise with the following resultant action in the voltage regulator.

• The volts coil to exert more pull thus increasing the current in the generator field.

• The volts coil to exert less pull thus increasing the resistance of the carbon pile.

• The volts coil to increase its magnetic field thus decreasing the field excitation.

In a constant frequency AC system, real load sharing is achieved by regulating the.

• voltage regulator.

• generator drive torque.

• generator speed.

The electrolyte of a nickel-cadmium battery is the lowest when the battery is.

• in a discharged condition.

• being charged.

• under load condition.