POWERPLANT 2023

The accumulation of clear ice on the aircraft can cause an increase in of up to

A.100%

B. 200%

C. 300%

D. 500%

C

states that does not spontaneously flow from a colder body to hotter one. Which of the following thermodynamics law states this?

A. Zeroth Law of Thermodynamics

b. First Law of Thermodynamics

c, second Law of Thermodynamics

d. Third Law of Thermodynamics

c

What type of transmission is used in Omega system?

A. Amplitude modulated wave

B. Continuous wave

C. Phase modulated wave

D. Frequency modulated wave

B

At what speed must a crankshaft turn if each cylinder of four stroke cycle engine is to be fired 200 times a minute?

A.800 грm

B. 200 гр

C. 400 rpm

D. 1600 rpm

C

From the top dead center to bottom dead center on the practical power stroke.

A. Temperature of the gases rises for a short time then decrease

B. The pressure of the gases remains constant

C. The temperature of the gases decreases from TDC to BDC

D. The density of the gas remain constant

A

If the intake valve is open too early in the cycle of operation of a four stroke cycle engine, it may result in

A. backfiring Into the induction system

B. Engine quit

C. Improper scavenging of exhaust gases

D. Engine kickback

A

The basic gas turbine engine is divided into two main sections; the cold section and the hot section.

I. The cold section includes the engine inlet, compressor, and turbine sections.

II. The hot section includes the combustor, diffuser, and exhaust sections.

A. only No. 1 is true.

B. only No. 2 is true.

C. neither No. 1 nor No. 2 is true. D. both No. 1 and No. 2 are true

C

Stator blades in the compressor section of an axial-flow turbine engine

A. increase the air velocity and prevent swirling.

B. straighten the airflow and accelerate it.

C. decrease the air pressure

D. decrease the air velocity and prevent swirling

B

Big fan engines get reverse thrust by

A.Blocking bypass air

B.Deflecting the exhaust gases C.Reversing the direction of rotation of the compressor D.Reversing the hot stream gases

A

Consider an airplane powered by a turbojet engine flying at standard altitude of 29,000 ft at a velocity of 455 mph. Calculate the pressure in psF at the altitude at which the aircraft is flying.

A. 682

B. 658

C. 677

D. 669

B

What is the frequency of rotation of the directional beam in a VOR? A. 20rps

B.15rps

C. 30rps

D. 50rps

B

Assuming compression is according to the law PV = constant. Calculate the initial volume of gas at a pressure of 2 bar which will occupy a volume of 6 m3 when it is compressed to a pressure of 42 bar.

A. 126 m3

B. 130 m3

C. 120m3

D. 136m3

A

The possibility of one phased array radar to act as multiple radars is called

A. Multimode

B. Digital

C. Interleaving radar

C

What does the cabin pressure controller switch to isobaric control?

A. During takeoff and climb

B. During cruise

C. During descent and landing

D. During prepressurization for taxi

B

Which type of seals are used between nonmoving surfaces to prevent leaks

A. Dynamic seals

B. U and V ring seals

C. Static seals, gaskets, and packing

D. O rings and square section seals

C

What is likely to occur If a reciprocating engine is operated at high power settings before it is properly warmed up?

A.Oil cooling.

B.Excessive thinning of the engine oil.

C.Accelerated oil breakdown and oxidation.

D. Oil starvation of bearings and other parts.

C

Which type of ice formation has little or no effect on flying but may obscure vision by coating the windshield?

A. Rime Ice

B. Clear lce

C. Hoar Frost

D. Mixed Icing

C

When encountering icing conditions, the Napier ice detector warns the pilot by

A. Emitting Beta particles

B. Rotating a serrated rotor shaft C. Sensing changes in air pressure D. Heating up to dissipate ice

B

Which statement is true regarding jet engines?

A. At the lower engine speeds, thrust increases rapidly with small increases in RPM.

B. At the higher engine speeds, thrust increases rapidly with small increases in RPM.

c. The thrust delivered per pound of air consumed is less at high altitude than at low altitude.

D. None of the above

B

In an axial-flow compressor, one purpose of the stator vanes at the discharge end of the compressor is to

A. straighten the airflow and eliminate turbulence.

B. increase the velocity and prevent swirling and eddying.

c. decrease the velocity, prevent swirling, and decrease pressure.

D. induce swirling motion to the airflow

A.

The air passing through the combustion chamber of a turbine engine is

A. used to support combustion and to cool the engine.

B. entirely combined with fuel and burned.

c. speeded up and heated by the action of the turbines.

D. used to increase the pressure of the gases Engine

A

pressure ratio is determined by

A. Multiplying engine inlet total pressure by the turbine outlet total pressure

B. Dividing engine inlet total pressure by turbine outlet total pressure

C. Multiplying turbine outlet total pressure by engine inlet total pressure

D. Dividing turbine outlet total pressure by engine inlet total pressure

D

What type of turbine blade is most commonly used in aircraft jet engines?

A. Reaction.

B. Impulse-reaction.

C. Impulse.

D. None of the above.

B

A piston/cylinder contains carbon dioxide at 300 kPa, 100°C with a volume of 0.2 m^3. Weights are added at such a rate that the gas compresses according to the relation PV ^1.2 = constant to a final temperature of 200°C. Find the work done during the process.

A. 60.4 KJ

B. -50.4 KJ

C. 80.4 KJ

D. -80.4 KJ

C

What is the purpose of the dump valve used on aircraft gas turbine engines?

A. The fuel is quickly cut off to the nozzles and the manifolds are drained preventing fuel boiling off as a result of residual engine heat.

B. The valve controls compressor stall by dumping compressor bleed air from the compressor discharge port under certain conditions.

C. Maintains minimum fuel pressure to the engine fuel control unit inlet and dumps excessive fuel back to the inlet of the engine-driven fuel pump.

D. To dump water waste

A

Hot spots in the combustion section of a turbojet engine are possible indicators of

A. faulty igniter plugs.

B. dirty turbine blades

C. dirty compressor blades.

D. malfunctioning fuel nozzles.

D

What type of oil system is usually found on turbine engines

A. Dry sump, dip and splash

B. Dry sump, pressure and spray C. Wet sump, pressure and splash D. Wet sump, spray and splash

B

When work is dissipated into internal energy, what is the change in the disorderly motion of molecules.

A. Increases

B. decreases

C. Remain the the same

D. none of the mentioned

A

Which of the folowing occurs without a change in the internal energy?

A. Isochoric process

B. Steady state process

C.Isenthalpic process

D. Isenthalpic process

A

What is the maximum altitude that can be measured using a radio altimeter?

A. 100ft

B. 500ft.

C. 50 ft

D. 5000FT

D

If a piston/cylinder with a cross-sectional size of 0.01 m^2 has a piston mass of 100kg resting on the stops, what should the water pressure be to lift the piston with an outside pressure of 100 kPa?

A. 218 kPa

B. 168kPa

C. 198kPa

D. 318kPa

C

which of the following is the standard fixed point of thermometry?

A. The steam point

B. The triple point of water

C. The ice point

D. All of the mentioned

B

Which of the following gives the Mechanical efficiency of the engine?

A. IP/BP

B. 1/(BP*IP)

C. (BP*IP)

D. BP/IP

D

In which of the following systems does mass transfer occur across the system boundary?

A. isolated system

B. closed system

C. open system.

D. none of the mentioned

C

Continued and/or excessive heat and centrifugal force on turbine engine rotor blades is likely to cause

A. profile.

B. creep.

C. galling.

D. rusting.

B

Which of the following statement is true?

A. for reversible adiabatic process, S=constant

B.for reversible isothermal heat transfer, Q=(Sf-Si)

C. both of the mentioned

D.none of the mentioned

A

Engine oil temperature gauges indicate the temperature of the oil

A. entering the oil cooler.

B. in the oil storage tank.

C. entering the engine.

D. in the exhaust

C

which part of the cylinder walls of a normally operating engine will the greatest amount of wear occur?

A. Near the center of the cylinder where piston velocity is greatest. B. Near the top of the cylinder,

C. Wear is evenly distributed

B

Which of the folowing is a primary engine instrument?

Tachometer

Air speed indicator

Fuel Flow

Meter altimeter

Tachometer

Which of the following is a statement of Archimedes" principle?

A. If a gas is maintained at a constant pressure, then its volume will be proportional to its absolute temperature.

B. Pressure applied to an enclosed fluid is transmitted undiminished to every portion of the fluid and to the walls of the container

C. A body immersed in a fluid is buoyed up with a force equal to the weight of the fluid displaced by the body

D. The total pressure across a system is constant.

C

What is the purpose of the gasper air system?

A. To supply air to the flight deck

B. To provide positive supply of conditioned air to all zones

C. To reduce the bleed air demand

D. To vent air overboard by the discharge valves

B

What is the magnitude of mechanical work?

A. product of the force and distance travelled perpendicular to the force

B. product of the force and distance travelled parallel to the force

C. sum of the force and distance travelled perpendicular to the force

D. sum of the force and distance travelled parallel to the force

B

An increase in manifold pressure with a constant RPM will cause the bearing load in an engine to

A. decrease

B. remain relatively constant

C. decrease then increase.

D. increase

D

1. Preignition is caused by improper ignition timing. (2) Detonation occurs when an area of the combustion chamber becomes incandescent and ignites the fuel/air mixture in advance of normal timed ignition. Regarding the above statements,

A. only No. 1 is true.

B. both No. 1 and No. 2 are true.

C. neither No. 1 nor No. 2 is true.

D. only No. 2 is true

C

To what altitude will a turbo charged engine maintain sea level pressure?

A. Critical altitude.

B. Pressure altitude.

C. Service ceiling.

D. Density Altitude.

A

Which Thrust rating is allowed for a limited time only?

A. Maximum Take Off Thrust

B. Maximum Cruise Thrust

C. Maximum Climb Thrust

D. Maximum Idle Thrust

A

The conditions at the beginning of compression in an Otto engine operating hot air standard k-1.34, are 101.3 kPa, 0.038 m^3, and 32 deg C. Clearance is 10% and 12.6 kJ of heat is added per cycle. Determine the Pm and cycle efficiency.

A. 201 kPa, 56%

B. 300 kPa, 47%

C. 200 kPa, 90%

D. 450 kPa, 66%

A

Which of the following can be used to reinforce the upward beam in a marker beacon?

A. Reflector

B. Counterpoise

C. Amplifier

D. Vertical polarization

B

The length of the piston movement in a reciprocating engine is called

A.Travel

B, Bore

C. Radial

D. Stroke

D

Considered as the "Father of Aerial Navigation", designed and experimented with a calorific engine which burned gunpowder as the fuel.

a. James Watt

B. Felix du Temple

C. George Cayley

d. William Samuel Henson

C

On a reciprocating engine, the ___ stroke begin with the piston at top dead center an the intake valve open. During this stroke, crankshaft rotation pulls the piston downward thereby reducing the pressure within the cylinder.

A. Compression

B. Intake

C. Exhaust

D. Power

B

As a piston moves through top dead center on a piston engine, It reverses direction again to begin the stroke. During this stroke, the piston IS pushed downward by the rapidly expanding gases within the cylinder.

a. Exhaust

b.Compression

c. Power

d. Intake

C

In this type of cooling system, the heat, which is conducted to the outer parts of the engine, Is radiated and conducted away by the stream of air, which is obtained from the atmosphere.

a. Air Cooling System

B. Pressure Cooling System

C. Liquid Cooling System

d. Anti-Freeze Solution

A

A type of reciprocating engine consists of one or more rows of odd-numbered cylinders arranged in a circle around a central crankshaft. Due to the small size of the crankcase, this engine type had a better power-to-weight ratio than most other designs of their day.

a. Radial Engines

B. V-Type Engines

C. In-line Engines

d. Horizontally-Opposed Engines

A

An aircraft engine or powerplant, produces thrust to propel an aircraft.

a. Lift

b. Thrust

c. Drag

d. weight

B

The early experiments of Orville and Wilbur Wright employed a horizontally arranged inline 4-cylinder, four cycle engine designed by Wright employee and mechanic Charles Taylor. What year did this happened?

à. 1885

b. 1903

c. 1876

d. 1925

b

May be of three major types: tapered, splined, or flanged.

a. Crank Shaft

b. Cam Shaft

c. Turbo Shaft

d. Propeller Shaft

D

Reciprocating aircraft, engines have that are used as part of the oil system. This are located at the low point of' the engine and are used to collect oil circulating through the engine after the oil has completed its tasks.

a. Filter

b. Sumps

c. Ramp

d. Step

B

A piston rod assembly which is primarily used in V-type Engines. The rod is split at the crankpin end to allow space for the blade rod to fit between the prongs. A single two-piece bearing is used on the crankshaft end of the rod. This type of connecting rod is not commonly used on modern reciprocating engine as

A. Plain-Type Connecting Rod

b. Master-And-Articulated Rod Assembly

C. ForK-Blade-Rod Assembly

d. split-type Rod Assembly

C

A type of piston ring construction which acts to prevent or minimize the escape of combustion gases past the piston during engine operation. They are placed in the ring grooves immediately below the piston head.

a. Compression Ring

c. Oil Scraper Ring

b. oil control Ring

d. "o" Ring

A

A part of the piston that prevents leakage of gas pressure from the combustion chamber and reduce to a minimum the seepage of oil into the combustion chamber.

a. Pin

b. Rod

c. Tube

d. Rings

D

Tubular in form, transmits the lifting force from the valve tappet to the rocker arm. A hardened steel ball is pressed over or into each end of the tube. One ball end fits into the socket of the rocker arm.

a. Push Rod

B. Valve clearance

C. Rocker Arm

d. Piston

A

The portion of the engine in which the power is developed. It provides a combustion chamber where the burning and expansion of gases take place, and it houses the piston and the connecting rod.

a. cam Shaft

B. Crankshaft

C. Cylinder

d. Piston tube

C

Consists of two runners and a balance tube with intake pipes for each cylinder to deliver induction air to each cylinder's intake port.

a. Downdraft Induction system

b. Induction System filtering

c. Downdraft Balanced Induction System

d. Updraft Induction System.

D

The ____ is usually a hollow part of the crankshaft that reduces the total weight of the crankshaft and provides a passage for the transfer of lubricating oil. On early engines, this part also served as a chamber for collecting sludge, carbon deposits, and other foreign material.

a. Crank cheek

c. Crank arm

b. Crankpin

d. Journal

D

Backbone of the reciprocating engine. It is subjected to most of the forces developed by the engine. Its main purpose is to transform the reciprocating motion of the piston and connecting rod into rotary motion for rotation of the propeller or helicopter transmission.

a. Cylinder

B. Camshaft

C. Crankshaft

d.Bore

C

A type of engine crankcase consists of two halves of cast aluminum alloy that are manufactured either with sand castings or by using permanent molds.

a. Opposed Engine Crankcase

b. Radial Engine Crankcase

C. capacitor

d. Inline Engine Crankcase

A

the foundation of a part. It contains the bearings and bearing supports in which it revolves

A. Crankcase

B. Crankshaft

C. Camcase

D. camshaft

A

the total energy per unit mass along any one streamline in a moving fluid is constant.

A. Bleed Diffuser Principle

B. U Tube Principle

C. venturi Principle

d. "v" Tube Principle

C

If the induction system of an engine runs rough and engine valve is sticking, what isolation procedure and correction needs to be done?

a. Inspect air valve then replace air valve it broken

b. Inspect intake pipe then replace defective intake pipes.

c. Inspect carburetor mounting and intake pipes then tighten carburetor and repair or replace intake pipe

d. Remove rocker arm cover and check valve action then lubricate and free sticking valves.

D

If engine fails to start and induction system is obstructed, what isolation procedure and correction needs to be done?

a. Inspect air scoop and air ducts then remove obstructions

b. Inspect air ducts then tighten nuts

c. Examine air valve then replace when needed

d. Inspect air filter theN clear air filter if needed

A

Is a result of the temperature drop that occurs when fuel is vaporized. As fuel is released into the airstream, it turns into a vapor and absorbs heat from the surrounding air.

a. Filter Ice

b. Impact Ice

C. Throttle Ice

d. Carburetor Ice

D

A type of induction system icing formation which is caused by visible moisture striking an aircraft and then freezing. The air intake and air filter areas of the induction system are most susceptible to this type of freezing.

a. Throttle ice

B. Fuel Evaporation Ice

C. Filter Ice

d. Impact Ice

D

Induction system ice can be prevented or eliminated

a. by raising the temperature of the air that passes through the system

b. by catching the ice using a filtration system

c. by using a fuel oil heat exchanger system

d. by using a fuel air heat exchanger system

A

The purpose of a fuel delivery system is to meter

a. Amount of fuel air mixture coming to the engine

b. Amount of power deliver in the engine

C. Amount of fuel and air that is delivered to the cylinder

D. Amount of fuel consumed by the system

c

Is defined as the linear distance that the piston moves in the cylinder.

a. Bore

b. Cycle

c. RPM

d. stroke

D

A standard____on a normally aspirated engine consists of four major components or sections an air intake, an Induction air filter, a fuel delivery system, and an induction manifold.

a.Induction System

b. Supercharger

c. Manifold System

d. Turbocharger

a

The ignition of the charge before the spark occurs at the sparking plug. This is usually caused by a local hot-spot' in the combustion chamber, such as incandescent carbon or very hot sparking plug points, with consequent rough running, running on, an loss of power.

a. Pre-heat

b. Pre-ignition

c. Pre-combustion

d. Pre-spark

b

has very good combustion characteristics and shows little tendency to detonate when mixed with air and ignited at high temperatures, and is given a rating of 100.

a. Normal Heptane

b. AVGASS 80

c. AVGASS 100LL

d. Iso-Octane

d

Detonation may be caused if the spark is too far advanced the charge ignites too early, giving higher temperatures.

a. Incorrect Ignition timing

b. Incorrect Mixture Strength

c. High Charge Temperature

d. Use of Incorrect Fuel

a

Detonation may be caused by the greater the amount of fuel for a given amount of air, the greater the power obtainable without denotation. If the power output is high, then the mixture must be rich.

a. Incorrect Ignition timing

b. Incorrect Mixture Strength

c. High Charge Temperature

d. Use of Incorrect fuel

b

Fuel AVGAS 100 is what color?

a. Red

b. Green

c. Blue

d. Colorless or Straw

b

One device used to control the speed and output of the turbocharger, but controls the system only at maximum output.

a. sloped Controller

b. Waste Gate Actuator

c. Absolute Pressure Controller

d. Throttle Control

d

Is made up of an impeller, a diffuser, and a casing.

a. Compressor Assembly

b. Axial Assembly

c. Impeller Assembly

d. Diffuser Assembly

a

Meters the fuel in proportion to the air and mixes the air with the correct amount of fuel. It can be controlled from the cockpat to regulate the flow of air. In this way, the power output of the engine can be controlled.

a. Carburator

b. Distribution Impeller

c. Compressor Gauge

d. Primer Nozzle

a

Measures the pressure of the fuel/air mixture before it enters the cylinders. It is an Indication of the performance that can be expected of the engine.

a. Carburator Air Temperature Indicator .

b. Ram Air Intake Gauge

c. Manifold Pressure Gauge

d. Distribution Impeller

a

The maximum continuous power the engine can produce

a. Take Off Power

b. Lift off Power

c. Maximum Power Rating

d. Rated Power

d

When the temperature rises above the standard temperature for a particular place, the density of the air in that location is _______and the density altitude _____________

a, Increase, increased

b. reduced, reduced

c. increase, reduced

d reduced, increased

d

is pressure altitude corrected for non- standard temperature. It is formally defined as "pressure altitude corrected for nonstandard temperature variations.

a. True Altitude

b. Pressure Altitude

c. Absolute Altitude

d. Density Altitude

d

the vertical distance of your airplane above sea level. Commonly expressed as "feet MSL" (feet above mean sea level), many of the airspace altitudes, terrain figures, airways, and obstacles you'll find on aeronautical charts are expressed in this altitude reading.

a. Absolute Altitude

b. True Altitude

c. Indicated Altitude

d. Pressure Altitude

b

The amount of _______done is directly proportional to the force applied and the distance the object moves.

a. Moment

b. work

c. Power

d. Distance

b

Is a sort of ice utilizing an eccentric rotary design configuration to change or convert pressure into a rotation energy motion.

a. Oil-heat Exchanger

b. Reciprocating Engine

c. Wankel Engine

d. Rotary Motion engine

b

The air-standard______ cycle has the following processes:

I. Starting with the piston at bottom dead center, compression proceeds isentropically from state 1 to state 2

II. Heat is added at constant volume from state 2 to state 3

III. Expansion occurs isentropically from state 3 to state 4

IV. Heat is rejected at constant volume from state 4 to state 1

a. Otto

b, Carnot

c. Diesel

d. Brayton

d

The statement of the second law states that "It is impossible to construct a device that operates in a cycle and produces no effect other than the transfer of heat from a cooler body to a hotter body"

a. Kelvin

b. Kelvin-Planck

C. clausius

d. Fahrenheit

b

The 2nd Law of Thermodynamics states that

a. Thermal equilibrium is transitive

b. Energy is conserved, its form can be converted

c. "Driving Force" for equilibrium uniquely defined

d. Energies can flow, equilibrate

D

The increase in energy given to the air comes from the heat released by burning the fuel. This in turn produces power in the engine. The weight of fuel burnt, (lbs) for the Dower produced (BHP) in unit time (HOUR) is called is called the

a. Fuel Consumption

B. Rotation Per Minute

C. specific Fuel Consumption

d. Revolution Per Minute

C

All single-row nine cylinder radial engine has a firing Order of

a. 2-4-6-8-1-3-5-7-9

B. 1-3-5-7-9-2-4-6-8

C. 1-5-9-4-8-3-7-2-6

d. 1-8-3-6-5-4-7-2-9

B