Powerplant

Question 1

How much shaft horsepower does the C30P engine produce at 75% torque in the BH206L4, L1+, and L3+?

a) 490.

b) 370.

c) 435.

Answer 1

B) 370.

Question 2

What are some major components of the C30P engine?

a) Compressor and combustion section.

b) 2-stage turbine section and power/accessory gearbox.

c) All are correct.

Answer 2

C) All are correct.

Question 3

What type of compressor is used in the BH206L4 C30P engine?

a) Dual stage axial to single stage centrifugal impellor.

b) Singe stage centrifugal impeller.

c) Single stage axial to centrifugal impeller.

Answer 3

C) Single stage axial to centrifugal impeller.

Question 4

What is the purpose of the bleed air valve and inducer bleed port on the C30P engine?

a) Facilitates air movement for acceleration during starting and eliminates compressor stall.

b) Facilitates air movement for deceleration during starting and induces compressor stall.

c) Interrupts air movement through the compressor at approximately 75% N2 rpm to induce compressor stall.

Answer 4

A) Facilitates air movement for acceleration during starting and eliminates compressor stall.

Question 5

The bleed air valve on the C30P engine is operationally controlled by

a) A switch on the collective head (INC/DEC switch).

b) Compressor speed/regulated pressure (P3).

c) The droop compensator system.

Answer 5

B) Compressor speed/regulated pressure (P3).

Question 6

On the C30P engine (BH206L4), at high compressor rpm, air

a) Enters the compressor through the inducer bleed port, increasing the volume of air entering the engine.

b) Exits the compressor through the inducer bleed port, decreasing the volume of air entering the engine.

c) Enters the compressor through the anti-icing ports, increasing the volume of air entering the engine, and decreasing the risk of compressor stall.

Answer 6

A) Enters the compressor through the inducer bleed port, increasing the volume of air entering the engine.

Question 7

On the C30P engine, what position is the bleed valve in during start?

a) Open.

b) Closed.

Answer 7

A) Open.

Question 8

When the ENG ANTI-ICE switch is turned on, compressor discharge (Pc) air flows

a) Through the anti-icing valve and inducer bleed port to the compressor wheel.

b) Through the anti-icing valve and tube to the compressor front support passages.

c) Through the bleed valve and inducer bleed port to the centrifugal stage of the compressor.

Answer 8

B) Through the anti-icing valve and tube to the compressor front support passages.

Question 9

In the BH206L4, the anti-ice switch is fail-safe

a) On.

b) Off.

Answer 9

A) On.

Question 10

In the C30P engine, 75% of airflow is used for combustion.

a) True.

b) False.

Answer 10

B) False.

Question 11

In the C30P engine, 75% of airflow is used for cooling and gas expansion.

a) True.

b) False.

Answer 11

A) True.

Question 12

In the C30P engine, the 2-stage gas producer turbine rotor drives

a) The compressor, starter/generator, fuel and oil pumps, and N1 fuel control.

b) The torquemeter and freewheeling unit.

c) All are correct.

Answer 12

A) The compressor, starter/generator, fuel and oil pumps, and N1 fuel control.

Question 13

In the C30P engine, the 2-stage power turbine rotor drives

a) The compressor, starter/generator, fuel and oil pumps, and N1 fuel control.

b) The torquemeter and freewheeling unit.

c) All are correct.

Answer 13

B) The torquemeter and freewheeling unit.

Question 14

In the C30P engine (BH206L4), TOT is sensed by _________ thermocouples located between the N1 and N2 turbine wheels.

a) 2.

b) 8.

c) 4.

Answer 14

C) 4.

Question 15

What are the two independent drivetrains in the power and accessory gearbox on the C30P engine?

a) Gas producer and power turbine.

b) Gas producer and fuel control.

c) Power turbine and freewheeling.

Answer 15

A) Gas producer and power turbine.

Question 16

The torque sensing mechanism on the C30P engine is a hydraulic type that uses the __________ as its pressure.

a) Engine fuel system.

b) Engine compressor discharge air (Pc).

c) Engine lubrication system.

Answer 16

C) Engine lubrication system.

Question 17

In the C30P engine, the oil system utilizes _________ to return the oil through the cooler to the tank.

a) One main pressure pump.

b) Four scavenge pumps.

c) Two scavenge pumps.

Answer 17

B) Four scavenge pumps.

Question 18

Normal engine oil capacity for the BH206L4 is

a) 6 US quarts.

b) 6 US gallons.

c) 6 US pints.

Answer 18

A) 6 US quarts.

Question 19

On the C30P engine, the engine driven fuel pump produces high pressure fuel based on N1 speeds and sends it to the

a) N2 governor for metering.

b) Fuel control for metering.

c) Droop compensator to maintain N2 rpm under all loading conditions.

Answer 19

B) Fuel control for metering.

Question 20

On the C30P engine, the gas producer fuel control senses __________ to regulate and maintain fuel flow.

a) Gas producer rpm and power turbine rpm.

b) Compressor discharge pressure and throttle position.

c) All are correct.

Answer 20

C) All are correct.

Question 21

On the C30P engine, the governor sends __________ signals to the fuel control to increase or decrease fuel flow to the combustion chamber based on N2 rpm changes and movement of the collective.

a) Oil pressure.

b) Fuel pressure.

c) Pneumatic.

Answer 21

C) Pneumatic.

Question 22

The purpose of the droop compensator system in the BH206L4 is to

a) Maintain N2 engine rpm as power demand is increased.

b) Maintain N1 engine rpm as power demand in increased.

c) Meter fuel flow to the engine based on compressor discharge pressure.

Answer 22

A) Maintain N2 engine rpm as power demand is increased.