Unit 16- Prime Movers And Engines Practise

Question 1

When deciding on the energy design of the plant, one of the following would not be of concern

1. ) type of fuel being burned
2. ) equipment costs
3. ) who are the customers
4. ) system efficiency
5. ) the environment

Answer 1

3

Question 2

The cross head of a steam engine

Answer 2

Imparts linear motion to the piston rod

Question 3

When checking bearings on running pieces of equipment it is wise to.

Answer 3

Get accustomed to normal operating temperature and vibration by touching equipment parts, such as bearings, lube oil, and cooling water returns

Question 4

The reciprocating motion of a steam engine is converted to rotary motion:

Answer 4

At the crankshaft

Question 5

A routine inspection of an operating steam engine should cover first and foremost.

Answer 5

Lubricators

Question 6

A steam engine will have the steam supply to the cylinder shut off once the piston has travelled

Answer 6

25- 35% of its stroke

Question 7

A steam engine piston

Answer 7

Moves fastest at the beginning of its stroke

Question 8

One of the first ways to detect fault in a reciprocating engine is

Answer 8

Sound

Question 9

A steam turbines exhaust can often supply a process with steam because

Answer 9

It is free of oil

Question 10

Turbines often have segmental carbon ring sealing glands held in place by:

Answer 10

Garter springs

Question 11

Turbine thrust bearings are fixed to the casing and prevent axial movement of the spindle by contracting a component on the shaft known as a

Answer 11

Collar

Question 12

A large reaction turbine will have

Answer 12

Steam pressure dropping through moving and stationary sections

Question 13

Turbine speed can be fine tuned with a device which will be limited to about 10% over the rated speed. The device is the

Answer 13

Hand speed control

Question 14

The great majority of steam turbine governing systems utilize the

Answer 14

Mechanical centrifugal principle

Question 15

A typical overspeed trip setting for a mechanical drive steam turbine will be

Answer 15

15% above normal speed

Question 16

When the steam pressure drops occurs in only the stationary members or components of a turbine, the turbine is known as a/an:

Answer 16

Impulse unit

Question 17

A steam turbine should trip or shutdown when normal operating speed is exceeded by

Answer 17

10-15%

Question 18

Shaft sealing carbon glands are:

Answer 18

Self lubricating

Question 19

Excessive wind velocity in a natural draft cooling towers may cause

Answer 19

High water drift or losses

Question 20

A cooling tower which requires neither fan nor fill is the

Answer 20

Venturi unit

Question 21

To prevent cooling tower basin water from freezing during cold weather many units are equipped with

Answer 21

Electric heating basins

Question 22

Scaling is not as severe in cooling towers as it is in boilers because

Answer 22

Temperature is not as high

Question 23

Natural draft cooling tower operate most efficiently in large open spaces and

Answer 23

Where wind is relatively constant

Question 24

Water contained in the air stream at the discharge of a mechanical draft cooling tower is removed

Answer 24

With drift eliminators

Question 25

Compared to a cross flow tower, a counter flow tower has

Answer 25

Less floor space

Question 26

The average amount of water volume which evaporates from a cooling tower is

Answer 26

5%

Question 27

A valve which prevents water flow over the fill of a tower during cold weather should not be closed until the temperature reaches

Answer 27

27 degrees celcius

Question 28

You are replacing the cooling tower fan motor bearings because

Answer 28

The noise which sounded like a bad bearing was heard

Question 29

The output of a gas turbine is directly related to the

Answer 29

Mass of gas passing through the turbine per second

Question 30

The air enters a gas turbine regenerator from

Answer 30

Downstream the compressor

Question 31

A combined steam and gas turbine arrangement could be termed

Answer 31

A co-generation system

Question 32

Early gas turbines were handicapped by

Answer 32

Metals not being able to withstand the high temperatures of the working fluid

Question 33

Many typical steam plant auxiliaries are eliminated with a gas turbine due to it’s

Answer 33

Simplicity

Question 34

A gas turbine compressor

Answer 34

May be on the same shaft as the turbine or on a separate shaft

Question 35

The temperature to which air can be raised at the turbine inlet is

Answer 35

An indication of the units efficiency

Question 36

Gas turbines are very popular where

Answer 36

Water is scarce

Question 37

A gas turbine performs most efficiently if

Answer 37

Ambient air temperature is low

Question 38

In a compression ignition engine the fuel is ignited by

Answer 38

The compressed air temperature

Question 39

Four stroke cycle engine valves are operated by

Answer 39

Cams

Question 40

An example of an engine which gives high torque at low speeds would be a

Answer 40

Four stroke motor cross motorcycle

Question 41

A major difficulty encountered with a two- stroke engine cycle is

Answer 41

Exhausting the spent gasses from the cylinder

Question 42

The fuel for a compression ignition engine is

Answer 42

Injected in atomized liquid form

Question 43

An engine which develops one power stroke with every two turns of the crankshaft is the

Answer 43

Four stroke natural gas engine

Question 44

Pre-mixing lube Is typical of the average

Answer 44

Two- stroke spark ignition engine

Question 45

Four cycle engine lubrication is ussually

Answer 45

By forced circulation

Question 46

When using compressed air to each cylinder for starting an industrial type compression ignition, the air pressure used is ussually

Answer 46

2100 Kpa

Question 47

Diesel engine governing is accomplished by

Answer 47

Varying the fuel quantity

Question 48

A two cycle engine

Answer 48

Must always have lube oil premixed with the fuel

Question 49

Using a compressed air starting motor is a common method of starting a

Answer 49

Large stationary Diesel engine