Engineers License Study Guide Flashcards
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Questions and Answers

What winding is connected to the load?

secondary

What regulates the steam pressure?

modulating pressure control

When can you blow down a water wall?

when there is no pressure on the boiler

What must be done to prevent flashback?

<p>purge</p> Signup and view all the answers

Steam at a high velocity is converted into ______ energy?

<p>kinetic</p> Signup and view all the answers

What is the supercritical pressure and saturation temperature?

<p>3206 PSIA at 705.4°F</p> Signup and view all the answers

One gallon of water weighs?

<p>8.33 pounds</p> Signup and view all the answers

What is the cylinder color of R-407C?

<p>chocolate</p> Signup and view all the answers

What is the cylinder color of R-404A?

<p>orange</p> Signup and view all the answers

How are particulates discharged into hoppers?

<p>rappers</p> Signup and view all the answers

When were the first regulations of the Clean Air Act established?

<p>1963</p> Signup and view all the answers

How many cubic inches of steam space is in a cylinder of an engine 10" x 24" with a stroke 2/3 of full travel?

<p>1243</p> Signup and view all the answers

Where is the flame-sensing device located?

<p>on the front of the furnace</p> Signup and view all the answers

Oil cooler pumps should be maintained at?

<p>140-160°F</p> Signup and view all the answers

What is a fail-safe device that cannot recluse itself?

<p>rupture disk</p> Signup and view all the answers

What controls the speed of the turbine?

<p>control speed governor</p> Signup and view all the answers

What two elements produce the most heat in fuel?

<p>hydrogen and carbon</p> Signup and view all the answers

What removes non-condensables?

<p>ejectors/vacuum pumps</p> Signup and view all the answers

Where would scale form?

<p>below the water line</p> Signup and view all the answers

What is Cold Junction?

<p>it is used as a reference point</p> Signup and view all the answers

Where would you find downcomers?

<p>in a water tube boiler</p> Signup and view all the answers

What chemicals are used to perform water treatment?

<p>reagents</p> Signup and view all the answers

What minerals cause scale?

<p>calcium and magnesium</p> Signup and view all the answers

What is the process of introducing fresh air into a building?

<p>ventilation</p> Signup and view all the answers

A boiler requiring excessive amounts of oxygen scavenging chemicals could indicate?

<p>a malfunctioning DA</p> Signup and view all the answers

What device opens at 75% of the motor's rated speed?

<p>centrifugal switch</p> Signup and view all the answers

Bursting psi is 1200, allowable PSI is 200. Safety Factor?

<p>6.0</p> Signup and view all the answers

What is the corrugated furnace used in vertical tubular or horizontal firebox boilers?

<p>morrison</p> Signup and view all the answers

What is an automatic valve with two valves and two discs?

<p>balanced valve</p> Signup and view all the answers

What is the corrugated furnace used primarily in horizontal furnaces?

<p>adamson</p> Signup and view all the answers

Transformers are rated in?

<p>VA</p> Signup and view all the answers

Water expanding to steam has what ratio?

<p>1600:1</p> Signup and view all the answers

What is the primary purpose of wet scrubbers?

<p>remove flue gas particulates</p> Signup and view all the answers

What technique is used to control particulates from boilers?

<p>fabric filters</p> Signup and view all the answers

What safety valve is set lower in pressure?

<p>superheater safety valve</p> Signup and view all the answers

What is the process of a water softener?

<p>Backwash, brine, rinse, service</p> Signup and view all the answers

What is the advantage of an open feedwater heater?

<p>removes oxygen faster</p> Signup and view all the answers

What is the evaporator approach temperature of a 3 pass chiller?

<p>5 degrees</p> Signup and view all the answers

What are the two main types of condensers?

<p>direct contact and surface condenser</p> Signup and view all the answers

What is the minimal amount of volume air changes in a purge cycle?

<p>4</p> Signup and view all the answers

How much BHP does 86,260 lbs/hr equal?

<p>2500</p> Signup and view all the answers

What method introduces lime and water into flue gas?

<p>slaker</p> Signup and view all the answers

What controls NOx emissions in gas turbine plants?

<p>selective catalytic reduction</p> Signup and view all the answers

How many BTUs are required to turn 1 lb of water into 1 lb of steam?

<p>970.3</p> Signup and view all the answers

What is the specific heat formula?

<p>Q= MCΔT</p> Signup and view all the answers

What controls the axial position of the turbine?

<p>thrust bearing</p> Signup and view all the answers

What is the primary controlling device on a three-element feedwater regulator?

<p>drum level</p> Signup and view all the answers

What are the classifications of centrifugal pumps?

<p>vertical, horizontal, volute and double suction</p> Signup and view all the answers

What are vapor bubbles forming and collapsing called?

<p>cavitation</p> Signup and view all the answers

What is the control sequence for air circulation?

<p>sensor, controller, controlled device, control agent and control medium</p> Signup and view all the answers

What is the feedwater control valve controlled by?

<p>water level, steam flow, and feedwater flow</p> Signup and view all the answers

Hardness that can be reduced by boiling is called _____ hardness?

<p>temporary</p> Signup and view all the answers

What is the evaporator approach temperature of a four-pass chiller?

<p>3-4</p> Signup and view all the answers

Hardness that can be reduced by chemicals is called _____?

<p>permanent</p> Signup and view all the answers

To convert inches of mercury to PSI, you multiply by _____?

<p>0.491</p> Signup and view all the answers

What is the pulley formula?

<p>Drive RPM × Drive Diameter = Driven RPM × Driven Diameter</p> Signup and view all the answers

What tests the relieving capacity of a safety valve?

<p>accumulation test</p> Signup and view all the answers

To convert PSI to inches of mercury, you would use the formula _____?

<p>_______/0.491</p> Signup and view all the answers

What is a common chemical testing method?

<p>titration</p> Signup and view all the answers

Copper testing is used for?

<p>heat exchanger and pump wear</p> Signup and view all the answers

What should the temperature be when the water leaves the DA Tank?

<p>within 3 to 5 degrees of steam temperature</p> Signup and view all the answers

What is the normal operating temperature in a DA?

<p>213</p> Signup and view all the answers

What should you do if the water level is slowly decreasing?

<p>immediately secure boiler</p> Signup and view all the answers

Which of the following are the two types of mechanical draft cooling towers? (Select all that apply)

<p>Forced draft</p> Signup and view all the answers

What pump supplies the water to the condenser to condensate the steam?

<p>Condensate</p> Signup and view all the answers

Given a single-phase 120-volt motor with a current drop of 24.2 amperes and a power factor rating of 90 percent, what is the motor's electrical load in kilowatts?

<p>2.9</p> Signup and view all the answers

Which of the following are the two types of condensers?

<p>Surface type</p> Signup and view all the answers

What uses the theory of centrifugal force to control the speed of the turbine?

<p>speed governor</p> Signup and view all the answers

What must you do to prevent air from leaking into a condenser?

<p>repair the carbon seal</p> Signup and view all the answers

The condensate pump removes water from the _____

<p>condenser</p> Signup and view all the answers

Turbine drains are supplied with traps that are _____ when the turbine is in operation and _____ when it is being started up.

<p>closed, open</p> Signup and view all the answers

What is fail-safe and cannot be reclosed or reset if it malfunctions?

<p>rupture disk</p> Signup and view all the answers

How are non-condensable gases and air removed from the condenser?

<p>ejectors</p> Signup and view all the answers

An explosion or flashback in a boiler can be caused by?

<p>relighting an extinguished fire without purging</p> Signup and view all the answers

Which of the following is not the purpose of an air cock on a steam drum?

<p>To let air into the drum when cooling down</p> Signup and view all the answers

It is necessary to keep a water seal on the atmospheric relief valve to?

<p>Stop air from getting into the condenser</p> Signup and view all the answers

In a pulverized coal plant, how is coal conveyed to the burners?

<p>primary air</p> Signup and view all the answers

In a water tube boiler, overheating of the tubes might be caused by?

<p>scale formation on the inside tube surfaces</p> Signup and view all the answers

Air is bypassed around the air heater when?

<p>the economizer is functioning as designed</p> Signup and view all the answers

Water wall header drains used for blow-down should only be used under which condition?

<p>when the boiler is not generating steam</p> Signup and view all the answers

What device regulates the burner depending on the steam pressure in the boiler?

<p>modulating pressure control</p> Signup and view all the answers

Given: Thermocouples have both a hot junction and a cold junction. The cold junction measures the ____ point.

<p>reference</p> Signup and view all the answers

In a three-element feed water control system, what is the main factor in determining regulation of feed water?

<p>boiler drum level</p> Signup and view all the answers

If you are operating a boiler with a three-element feed water regulator, what is being measured and recorded by mechanically operated meters?

<p>steam flow, feed water flow, and drum level</p> Signup and view all the answers

How many inches of mercury are there at an atmospheric pressure of 13.93 psi?

<p>28.37</p> Signup and view all the answers

Copper testing is used to detect?

<p>heat exchanger and pump wear</p> Signup and view all the answers

Hardness that can be reduced by heating water is called ____ hardness?

<p>temporary</p> Signup and view all the answers

According to Stationary Engineering, residual sodium sulfite in the boiler should be maintained between ____ ppm and ____ ppm?

<p>15; 30</p> Signup and view all the answers

What is the proper order for the four regeneration steps for a sodium zeolite water softener?

<p>Backwash, brine, rinse, service</p> Signup and view all the answers

The chemicals used to perform water treatment tests are called ____

<p>reagents</p> Signup and view all the answers

A four wire, wye-connected system with a phase-to-phase voltage of 208V has a phase to neutral voltage of ____V?

<p>120</p> Signup and view all the answers

On a single-phase motor, what device opens at 75 percent of the motor's rated speed, disconnecting the start winding?

<p>centrifugal switch</p> Signup and view all the answers

Large centrifugal chillers (excluding electronic start) primarily use what type of motor starting to reduce inrush current on start-up?

<p>wye-delta</p> Signup and view all the answers

The perforated plate-type baffle at the steam outlet in a boiler steam drum is installed to?

<p>aid in the delivery of dry steam</p> Signup and view all the answers

The fly ash buildup is cleaned from the collector plates and electrodes in the electrostatic precipitator by?

<p>the use of a rapper system</p> Signup and view all the answers

Which type of stoker feed system uses a ram feed?

<p>Spreader</p> Signup and view all the answers

What are the two chief heat-producing elements in fuel?

<p>carbon and hydrogen</p> Signup and view all the answers

What should the water temperature be when leaving the deaerator?

<p>within 3 degrees F to 5 degrees F of steam temperature</p> Signup and view all the answers

How do you ensure that complete combustion will take place in the combustion chamber?

<p>increase excess air</p> Signup and view all the answers

Which coal has the highest volume of fixed carbon?

<p>anthracite</p> Signup and view all the answers

Study Notes

Boiler Operations and Controls

  • Secondary Winding: Connects to the load in electrical systems.
  • Modulating Pressure Control: Regulates steam pressure to maintain system balance.
  • Flame Sensing Device: Located on the front of the furnace for safety monitoring.
  • Oil Cooler Maintenance: Should be kept between 140-160°F for optimal performance.

Water and Steam Properties

  • Steam Velocity: High-velocity steam converts kinetic energy into usable energy.
  • One Gallon of Water: Weighs approximately 8.33 pounds.
  • Supercritical Pressure: At 3206 PSIA, the saturation temperature is 705.4°F.
  • Expansion Ratio: Water expands to steam at a ratio of 1600:1.

Chemical and Water Treatment

  • Water Treatment Chemicals: Reagents are used for effective water treatment.
  • Scale Formation: Primarily caused by calcium and magnesium minerals.
  • Temporary Hardness: Can be reduced by boiling water.
  • Permanent Hardness: Requires chemical treatment for reduction.

Safety and Maintenance

  • Rupture Disk: A fail-safe device that cannot reclose once it operates.
  • Centrifugal Switch: Engages at 75% of motor's rated speed to disconnect the starting winding.
  • Water Wall Header Drains: Should only be used when the boiler is not generating steam.
  • Burner Regulation: Managed via modulating pressure control based on steam pressure.

Mechanical Components and Energy

  • Centrifugal Pumps Classification: Includes vertical, horizontal, volute, and double suction types.
  • Thrust Bearing: Controls the axial position of turbines within machinery.
  • Drum Level Control: Primary controlling device for maintaining feedwater in three-element systems.
  • Pulley Formula: Drive RPM multiplied by Drive Diameter equals Driven RPM multiplied by Driven Diameter.

Environmental and Emission Controls

  • Wet Scrubbers: Used primarily to remove flue gas particulates from emissions.
  • Selective Catalytic Reduction: An effective tool for controlling NOx emissions in gas turbines.

Energy Conversion and Efficiency

  • Evaporator Approach Temperature: For a three-pass chiller, should be around 5 degrees F.
  • BTUs for Steam Generation: Requires 970.3 BTUs to convert 1 lb of water to steam.

Miscellaneous

  • Condensate Pump: Removes water from the condensate system to maintain efficiency.
  • Ejectors/Vacuum Pumps: Utilized to remove non-condensables from steam systems.
  • Test Methods: Titration is a common chemical testing method for water quality.
  • Anthracite Coal: Known for having the highest volume of fixed carbon among coal types.

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Test your knowledge with these flashcards designed for engineers preparing for their licensing exam. Each card focuses on essential terms and definitions related to engineering concepts. Perfect for quick review and memorization before the big test.

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