1st B

Question 1

How does a lithium bromide system work starting with the generator

Answer 1

Near perfect vacuum. Water as the refrigerant and bromide and absorbent.
Heat in the generator evaporates the water from the bromide.
Bromide flows to absorber, and water is condensed in the condenser then sprayed over coils in the evaporator.
As the waster evaporates it pulls heat from the water to be cooled.

Question 2

What four factors determine the combustion space of a boiler

Answer 2

Fuel characteristics
Firing Method
steam pressure
heating capacity

Question 3

How is a generator protected from a bad ground or a short

Answer 3

Circuit breakers, fuses, ground faults.
AC injection based protection ignores the affects of sudden DC current changes.

Question 4

What determines the voltages of a DC generator

Answer 4

Strength of magnetic field
Number of conductors cutting this field
Speed of rotation

Question 5

How is electricity produced in the generator

Answer 5

Generator uses a magnetic field created by coils and the electric pressure created in a conductor that is cutting through the magnetic field to create voltage.

Question 6

Define rupture disk

Answer 6

Prebulged membrane
Turbine exhaust in case the condenser losses vacuum

Question 7

What could cause a turbine to be noisy

Answer 7

Unbalanced rotating parts
Misaligned or bent shaft
Moisture in the steam
Loose bearings
Overheating
Worn parts

Question 8

List six ways to test steam traps

Answer 8

Temp difference in & out
Listening device
Temp crayons
Flow indicator
Test valves
Knowledge of equipment

Question 9

Electrical drawing
Line above two circles

Answer 9

normal closed

Question 10

Electrical drawing
Line below two circles

Answer 10

Normal open

Question 11

What items would be listed on an EPA refrigerant compliance program checklist

Answer 11

All owners/operators of equipment containing over 50 pounds of refrigerant must:
-Keep records of refrigerant and service performed
-Understand updated regulations and policies
-Written mission statement for compliance
-Written job description for someone trained in refrigeration
-Copies of EPA certs
-Written storage and inventory policy
-Written leak test policy
-Response plan for accidents

Question 12

What are slip ring motors used for
Give 4 examples

Answer 12

Starting current of the equipment under full load would be excessive
Compressors, loaded conveyors, mixers, grinders
-

Question 13

Name and explain the auxiliary device necessary for startup on a DC motor

Answer 13

Starting rheostat or a starting box with considerable resistance is connected to the circuit to reduced the current going to the motor.
As it gains speed the rheostat increases the voltage until full speed is attained.

Question 14

How does an evaporator condenser work

Answer 14

-steam coil in a tank
-water is fed to the tanks and it boils
-cool condensate runs through the coils to condense the vapor, producing distilled water

Question 15

Who can inspect and repair your UST leak detection and overfill protection systems?
List six things to log on the report

Answer 15

-Qualified UST inspector/contractor
-Identify equipment
-Release detection
-suspect or confirmed releases
-spill & overfill protection
-corrision protection
-walk through inspection

Question 16

Tenacity

Answer 16

resist pulling stress

Question 17

Ductility

Answer 17

Endure elongation

Question 18

Malleability

Answer 18

Change shape by hammering

Question 19

Elastcity

Answer 19

Resume normal shape

Question 20

resilience

Answer 20

storage and return of work energy while being stressed to its elastic limits

Question 21

hardness

Answer 21

resist wear

Question 22

What is pressure stage of turbine

Answer 22

Allows only a limited pressure drop in ones set of nozzles

Question 23

What is velocity stage of turbine

Answer 23

Applying velocity energy in the steam coming from nozzles to two or more sets of moving blades

Question 24

What is the difference between pressure and velocity stage of turbines

Answer 24

Difference is where the pressure drops occur

Question 25

What is the difference between an impulse and reaction turbine

Answer 25

Impulse- expansion of the steam occurs almost entirely in its stationary blades Reaction- Expansion of the steam occurs in the rotating blades

Question 26

Name four kinds of impulse turbines

Answer 26

-re-entry flow -rotor -vertical -horizontal

Question 27

Name four kinds of reaction turbines

Answer 27

-tandem -single flow -double flow -parsons

Question 28

List five EPA responsibilites

Answer 28

-establish and enforce regulation -offer grants -study issues affecting the environment -teach others about the environment -assist homeland security

Question 29

Name 3 types of coal mills

Answer 29

Ball Bowl Hammer

Question 30

Describe ball mill

Answer 30

Consists of a rotating cylinder or tube containing steel balls. Coal is introduced into the tube and tumbling steel balls crush it to powder.

Question 31

Describe bowl mill

Answer 31

Uses heavy rollers which run against a steel ring or bowl. Coal in introduced into the bowl and is crushed between bowl and rollers.

Question 32

Describe hammer mill

Answer 32

Uses hinged hammers to crush the coal against a steel striking plate

Question 33

What steam condition is a reaction turbine best suited for

Answer 33

Low to medium head applications and high flow rates

Question 34

Falling film evaporator

Answer 34

a liquid film flows down a heated vertical tube

Question 35

Rising film evaporator

Answer 35

the rising film allows the liquid to rise as a vapor forms

Question 36

Plate evaporator

Answer 36

It uses multiple plates with a large surface area for heat transfer.

Question 37

What is the purpose of the equalizer in a boiler?

Answer 37

Balances the pressure between the boiler's steam outlet and condensate return inlet

Question 38

What is a waste heat boiler

Answer 38

A waste heat boiler uses the heat formed as a byproduct of another process, heat which would normally be wasted, and uses it to create steam.