B1-1 Prime Movers And Engines

Front 1

True or False: A gas engine is considered a heat engine while a steam plant used to produce mechanical energy is not

Back 1

False

Front 2

An electric engine is not a prime mover because?

Back 2

They are neither a part of a heat engine and they do no convert a natural heat source

Front 3

True or False: Gas engines and Steam turbines are both examples of machines which are both prime movers and heat engines

Back 3

True

Front 4

In a Steam engine steam is admitted to one side of the piston then the other. Steam is only asmitted for _____________ of the power stroke of the piston and is then cut off

Back 4

1/4 to 1/3

Front 5

After cutoff the steam in thhe cylinder continues to provide a force on the piston as it _________ through the remainder of the stroke

Back 5

Expands

Front 6

Once expansion is completed, the steam is exhausted by the:

Back 6

Slide Valve

Front 7

The passages through which the steam flows in to and out of the cylinder are called the:

Back 7

Steam Chest

Front 8

Five advantages of a steam turbine over a steam engine or diesle engine are:

Back 8

1. Greater Thermal Efficiency
2. Compact Size
3. Maintenacce Costs and Reliability is Improved
4.Bearing Located Outside High Temp Zones
5. Requires no Lubrication within the steam

Front 9

The two basic types of steam turbines are:

Back 9

1.Impulse
2.Reaction

Front 10

If Steam pressure drops only in the stationary blades the turbine is classified as:

Back 10

Impulse Turbine

Front 11

If the steam pressure drops in the moving blades as well as in the stationary blades it is classified as:

Back 11

Reaction Turbine

Front 12

True or False: The stationary passages in a steam turbine may consist of both nozzles and stationary blades

Back 12

True

Front 13

The rotor passages in a steam turbine consist of blades or buckets which are attached to:

Back 13

The Turbine Rotors

Front 14

True of False: Force is exerted on a steam turbine impulse blade only by the change in direction of the steam as it passes through the moving blades

Back 14

False

Front 15

True or False: The force exerted on a reaction turbine is due to the change in direction of the steam passing through the blading and also the drop in pressure as the steam passes through the nozzle shaped moving blades

Back 15

True

Front 16

True or False: High pressure steam is supplied to the steam chest of a turbine which discharges the steam through the governor valves to the first set of nozzles

Back 16

True

Front 17

True or False: The turbine caseing must be designed to withstand the inlet steam pressure

Back 17

True

Front 18

True or False: With a hydralic Governor, as the turbine speed increases, the pressure produced by the oil pump is increased

Back 18

False

Front 19

With a hydralic governor the oil pump is driven from the:

Back 19

Turbine Shaft

Front 20

The purpose of the hand speed changer in a hydralic governor is to:

Back 20

Allow the operating speed to be varied

Front 21

True or False: With a hydraulic governor the oil used to control the governor valve is also used for bearing lubrication

Back 21

True

Front 22

With a steam turbine, a large amount of lubricating oil is supplied to the bearings because:

Back 22

Heat is removed from the bearings by the circulating oil

Front 23

List four factors that affect the rate of heat transfer in a colling tower

Back 23

1.Realative velocity of both air and water during contact
2.Area of water surface in contact with the air
3.Length of contact time between air and water
4.Relative humidity of the air

Front 24

Cooling towers are divided into two classes and they are:

Back 24

Natural Draft and Mechanical Draft

Front 25

Natural Draft cooling towers are subdivided into 2 classes

Back 25

Atmospheric and Chimney

Front 26

The two types of mechanical draft towers are:

Back 26

Forced Draft and Induced Draft

Front 27

The air flow through either type of mechanical draft colling towers can be classified as:

Back 27

Crossflow or Counterflow

Front 28

In a simple gas turbine, air is first drawn in the compressor and the compressed air is discharged from the compressor into the:

Back 28

Combustor

Front 29

The hot Air from the Gas Turbine combustor is expanded through:

Back 29

The Turbine Blading

Front 30

Aprroximately ___________ of the power produced by a gas turbine is use to drive the turbine compressor

Back 30

2/3

Front 31

Prior to fuel being admitted, an auxillary starting motor is used to bring a gas turbine up to a speed of:

Back 31

20-30% of operating speed

Front 32

True or False: A gas turbine having no heat exchangers such as a regenerator or cooler to improve efficiency is classified as a simple cycle

Back 32

True

Front 33

In order to describe and interal combustion engine it is necessary to specify what two details

Back 33

1.Fuel Used
2.Working Cycle

Front 34

True or False: in a compression ignition engine, the air is heated by being drawn into the cylinder and compressed. The fuel is then injected into the cylinder and ignited from the hot compressed air

Back 34

True

Front 35

True or False: In a gasoline engine, the air and fuel is drawninto the cylinder and compressed. This compression causes the fuel to be ignited

Back 35

False

Front 36

One stroke in an internal combustion engine refers to the complete movement of the _______ in direction which corresponds to _____________ of the crankshaft

Back 36

1.Piston
2.One Half

Front 37

In a four stroke cylce engine. each cylinder is fitted with two or more __________ valves held closed by _______

Back 37

1.Poppet
2.Springs

Front 38

The four strokes referred to in a four stoke engine are:

Back 38

1.Intake Stroke
2.Compression Stroke
3.Power Stroke
4.Exhaust Stroke

Front 39

During the ______ stroke of a four stroke engine the inlet valve is open and the exhaust valve is closed

Back 39

Intake

Front 40

During the _____ stroke of a four stroke engine the inlet valve and the exhaust valve are both closed and the piston is moving upward in the cylinder

Back 40

Compression

Front 41

During the _______ stroke of a four stroke engine the exhaust valve is open and the inlet valve is closed. During this stroke the piston is moving _______ in the cylinder

Back 41

1.Exhaust
2.Upward

Front 42

True or False: The camshaft and valves of a two stroke engine are driven from the crankshaft through timing gears

Back 42

False

Front 43

The air trapped in a cylinder of a typical compression igniton engine is heated to about:

Back 43

540 to 650 Degrees C

Front 44

The pressure in the typical compression ignition engine is increased to about

Back 44

2800 to 4300 kPa