Powerplant V Mod 3 Quiz

Reciprocating Engine Starting Systems / Gas Turbine Engine Starters

How does an inertia starter help in starting a reciprocating engine?

 

By storing kinetic energy in a flywheel

What is the role of a starter in the starting process of a turbine engine?

 

To help the engine rotate up to a self-sustaining speed

Why are solenoids and heavy wiring used in a direct cranking electric starter?

 

To reduce overall cable weight and voltage drop

What is a starter solenoid?

 

An automatic engaging and disengaging mechanism

Which component of a direct cranking electric starting system is responsible for converting high speed low torque to low speed high torque?

 

Gear section

What is the appropriate strategy for starting an engine using a starter mechanism?

 

Energize the starter for 1 minute, then allow it to cool for 1 minute

What is the purpose of a clutch spring in a starter system that incorporates worm reduction gears?

 

To tighten around the drum of the starter shaft gear

What type of gear is used in an automatic starting system to transfer torque from the starter motor to the crankshaft?

 

Worm gear

What is the recommended tension for brush springs in a starter motor?

 

Firm

What is the purpose of moving the sandpaper or stone back and forth across the commutator when cleaning it?

 

To avoid wearing a groove

Which type of starter is typically used on small gas turbine engines?

 

Electric starter

What supplies the air used to operate an air turbine starter?

 

All of these are correct

The APU, A cross-bleed start from an engine already operating, A ground-operated air cart.

What is the purpose of the undercurrent controller in a starter generator system?

 

To control the input to the starter and ensure positive action

What is the function of the shunt field in a starter generator unit?

To control the voltage output of the generator

What is a benefit of using a starter generator system?

Reduced weight and space on the engine

What is the main component of an air turbine starter?

Axial flow turbine

What is the function of the sprag clutch assembly in an air turbine starter?

 

All answers are correct

To allow the gear train to coast to a halt, To disengage when the drive coupling turns more rapidly than the rotor side, and To engage automatically when the rotor starts to turn

What is the purpose of the reduction gear train in an air turbine starter?

To turn the drive coupling

What is the function of the starter inlet screen?

 

To filter the inlet air

What is the function of the butterfly valve in the pressure-regulating valve assembly?

To control air flow into the starter

Which component is responsible for engaging the gear train in an air turbine starting system?

The clutch

What is the purpose of the servo bleed in an air turbine starting system?

 

To vent the servo chamber

What is the purpose of the bellows in an air turbine starting system?

To sense downstream pressure

What is the first step to take when troubleshooting an air turbine starting system?

Refer to the manufacturer's instructions