ambient air is drawn into the compressor, where it is pressurized

Ambient air is drawn into the compressor, where it is pressurized

Isobaric process

Isentropic process

The air is heated before being pressurized

The air is cooled before being pressurized

One of the advantages of gas turbine compared to steam turbine is?

Gas turbines are compact and easy to operate

Gas turbines are more fuel efficient than steam turbines

Gas turbines have lower maintenance costs compared to steam turbines

Gas turbines have longer operational life than steam turbines

One of the problems of Gas turbine is?

Turbine corrosion

High fuel consumption

Excessive noise production

Inefficient power output

The rotational speed at which acting dynamic forces cause a machine

Critical speed

Optimal speed

Maximum speed

Safe speed

Twisting of the shafts in a rotor assembly that is superimposed to the running speed

Torsional vibration

Shaft misalignment

Bearing failure

Excessive heat generation

The propelling nozzle design to

Increase the velocity

Increase the temperature

Decrease the velocity

Add more weight to the nozzle

Turbine blades are cooled by?

Transpiration cooling

Air cooling

Water cooling

Radiation cooling

Eff of a bearing?

Engine oil pressure

Low friction

Temperature

Bearing material

Stoichiometric temperature (basta yan yung keyword sa tanong)?

Ideal combustion where fuel burned completely

The temperature at which a substance changes its state from solid to liquid

Stoichiometric temperature refers to the temperature at which a chemical reaction reaches equilibrium

The temperature at which a substance undergoes complete decomposition

The fuel supply must be adjusted automatically to correct for changes in

Temperature

Density

Viscosity

Pressure

Has fixed nozzles that orient the gas/steam flow into high speed jets

Impulse

Reaction

Radial

Axial

In gas turbine classification, a twin spool gas turbine is classified as?

Open cycle

Closed cycle

Single spool gas turbine

Combined cycle

Is driven by the turbine in the rear of the engine

Compressor

Exhaust

fuel injection system

Cooling system

Converts the gaseous energy of the air/burned fuel mixture out of the combustor into mechanical energy to drive the compressor?

Turbine

Fan

Propeller

Piston

The compressed air then runs through a combustion chamber

Isobaric process

Isentropic process

Both are correct

Both are incorrect

which consists of a spring mass system, is primarily used where the frequency measured is well below the machine’s natural frequency and that of the spring-mass system.

Seismic probe

Vibration damper

Shock absorber

Torsion bar

It prevents oil in the gearbox from leaking past the drive shafts of the starter?

Carbon seal

Rubber gasket

Magnetic field

Friction reducer

What is the seal that combine a rotating seal having oil slingers and a serrated surface with a stationary seal having wind back threads and a smooth rub surface?

Labyrinth seal

Rotary seal

Threaded seal

Rubber seal

When the air passes to the compressor, the volume will?

Reduce

Increase

Stay the same

Disappear

What is the part name of number 6?

Housing

Coupling

Engine under test

Rotor

This device applies some load on the engine, measures the resultant power then uses the power to determine the torque.

Dynamometer

Tachometer

Fuel gauge

Odometer

This device applies some load on the engine, measures the resultant power then uses the power to determine the torque.

Engine torque

Critical speed

Torsional Vibration

Turbine

Is made from cast iron and used to accommodate the cooling water and scavenge airspace.

Entablature

Frame

Bedplate

None of the above

is similar to the shape of letter ‘A’ and is installed above the bedplate of the engine.

Frame

Entablature

Bedplate

Rotor

The bottom-most portion of the engine which is the base of the engine and accommodates crankshaft bearings and A-frame

Bedplate

Frame

Entablature

None of the above

The geometry of this joint causes torsional vibrations if the shafts are not parallel.

Universal joint

Double joint

V joint

Single joint

During the engagement of a friction element, stick slip situations create torsional vibrations.

Stick slip

Flash

None of the above

Lash

Drive train lash can cause torsional vibrations if the direction of rotation is changed or if the flow of power

Lash

Flash

Stick slip

All of the above

How many consecutive hours can a machinery spaces may be unattended?

16 hours consecutive

12 hours consecutive

20 hours consecutive

8 hours consecutive

Who should never enter or remain in an unmanned machinery space alone, unless they have received permission from, or been instructed by the engineer officer in charge?

Personnel

Visitors

Maintenance workers

Supervisors

What do you call the control for power operated main and auxiliary steering gears is from the bridge and steering gear compartment?

Steering gear

Steering lever

Control wheel

Steering knob

What do you call the process in which the temperature of a space or its contents is reduced to below that of their surroundings?

Refrigeration

Cooling

Freezing

Chilling

What is the engine system must be treated with the same care as the oil in the main engine system?

HFO

None of the above

What do you call the power that supply for ships machinery operation?

Emergency power

Auxiliary power

Propulsion power

Vessel power

What do you call the fitted to high-pressure centrifugal pumps. This is a ring fixed to the casing, around the impeller, in which there are passages formed by vanes?

Diffuser

Diffusor

Vane ring

Impeller casing

What do you call the heat exchanger that is made up of a number of pressed plates surrounded by seals and held together in a frame?

Plate type heat exhanger

Shell type heat exhanger

Condenser

Compressor

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