Stationary Engineer Practice Quiz

Reviewed by Editorial Team
The ProProfs editorial team is comprised of experienced subject matter experts. They've collectively created over 10,000 quizzes and lessons, serving over 100 million users. Our team includes in-house content moderators and subject matter experts, as well as a global network of rigorously trained contributors. All adhere to our comprehensive editorial guidelines, ensuring the delivery of high-quality content.
Learn about Our Editorial Process
| By Mike Jewel
Mike Jewel, Stationary Engineer
Mike, a state and municipally licensed steam and stationary engineer, boasts over 20 years of experience in building trades. His expertise reflects a seasoned professional dedicated to his craft.
Quizzes Created: 1 | Total Attempts: 29,675
| Attempts: 29,975
Quiz Flashcard
SettingsSettings
Please wait...
  • 1/190 Questions

    1. In order to permit the water in a hot water heating system to expand without a corresponding increase in pressure, an ______________ _________ must be used.

    • Isolation tank
    • Expansion tank
    • Mud drum
    • Differential tank
Please wait...
About This Quiz

Do you wish to be a Stationary Engineer? Get ready to take this quiz on Stationary Engineer Class 3 Examination that is here for you. A compendium of questions that should help with any licensing exam. This quiz is going to be educational and interesting as well at the same time. Would you be able to get a score above See more70 on this quiz? You are an expert if you are able to do so. Let's see how well you perform. Best of luck to you!

Stationary Engineer Practice Quiz - Quiz

Quiz Preview

  • 2. 

    1. The _______________ is the heart of the refrigeration system.

    • Condesnsor

    • Evaporator

    • Compressor

    • Metering device

    Correct Answer
    A. Compressor
    Explanation
    The compressor is considered the heart of the refrigeration system because it plays a crucial role in the cycle. It is responsible for compressing the refrigerant gas, raising its temperature and pressure. This compressed gas then moves to the condenser where it releases heat and transforms into a high-pressure liquid. Without the compressor, the refrigeration cycle would not be able to function properly as it is responsible for circulating the refrigerant and maintaining the necessary pressure levels.

    Rate this question:

  • 3. 

    1. In _______________ boilers, the water passes through the tubes, and the products of combustion pass around the tubes.

    • Watertube

    • Firetube

    • Cast iron

    • Miniature

    Correct Answer
    A. Watertube
    Explanation
    In watertube boilers, the water passes through the tubes, and the products of combustion pass around the tubes. This design allows for efficient heat transfer and faster steam production. The water is contained within the tubes, which are surrounded by hot gases from the combustion process. This arrangement increases the surface area for heat exchange and provides better control over the temperature and pressure of the steam. Watertube boilers are commonly used in power plants and industrial settings where high steam production and efficiency are required.

    Rate this question:

  • 4. 

    1. The presence of scale on the boiler tubes will result in a _______________ in the boilers efficiency, and an _______________ in the temperature on the boiler tubes.

    • Decrease, improvement

    • Increase, improvement

    • Decrease, increase

    • Increase, decrease

    Correct Answer
    A. Decrease, increase
    Explanation
    The presence of scale on the boiler tubes will cause a decrease in the boilers efficiency, as the scale acts as an insulator and reduces heat transfer. This decrease in efficiency will result in an increase in the temperature on the boiler tubes, as the heat is not being effectively transferred away.

    Rate this question:

  • 5. 

    1. A ________ _______ AHU supplies conditioned air to only one area of the building.

    • Variable Volume

    • Constant Volume

    • Single Zone

    • Multi Zone

    Correct Answer
    A. Single Zone
    Explanation
    A Single Zone AHU supplies conditioned air to only one area of the building. This means that the AHU is designed to serve a specific zone or room, and the air flow and temperature can be adjusted for that particular area. This type of AHU is commonly used in small spaces or individual rooms where the conditioning needs may differ from other areas of the building.

    Rate this question:

  • 6. 

    1. ____________is the bleeding of a portion of the water to remove suspended solids.

    • Blowback

    • Blowdown

    • Cleanout

    • Purging

    Correct Answer
    A. Blowdown
    Explanation
    Blowdown is the process of bleeding a portion of the water to remove suspended solids. This is typically done in industrial settings, such as power plants or boilers, to maintain the quality of the water and prevent buildup of impurities. By removing the suspended solids through blowdown, the water can be kept clean and the equipment can operate more efficiently.

    Rate this question:

  • 7. 

    1. A solid that precipitates out of solution and adhere to the boiler heating surfaces is called__________.

    • Scale

    • Precipitant

    • Crust

    • Embrittlement

    Correct Answer
    A. Scale
    Explanation
    Scale is the correct answer because it refers to the solid that forms and adheres to the heating surfaces of a boiler. This scale is typically formed when minerals and impurities in the water precipitate out and accumulate over time, reducing the efficiency of the boiler and potentially causing damage.

    Rate this question:

  • 8. 

    1. ___________ deflect the hot gases back and forth between the tubes a number of times to enable greater heat absorption by the boiler tubes.

    • Headers

    • Stays

    • Baffles

    • Tube sheets

    Correct Answer
    A. Baffles
    Explanation
    Baffles are used to deflect the hot gases back and forth between the tubes in order to increase the heat absorption by the boiler tubes. They create a zigzag pattern for the gases, ensuring that they come into contact with the tubes multiple times. This increases the efficiency of heat transfer and allows for greater heat absorption by the boiler tubes.

    Rate this question:

  • 9. 

    1. When two or more boilers are connected into a common steam header, and each boiler is equipped with a man-hole,_____ stop valves must be used on each boiler.

    • 4

    • 3

    • 5

    • 2

    Correct Answer
    A. 2
    Explanation
    When two or more boilers are connected into a common steam header, and each boiler is equipped with a man-hole, 2 stop valves must be used on each boiler. This is because having 2 stop valves on each boiler provides an additional level of safety and allows for maintenance and repairs to be carried out on one valve while the other valve remains operational. It also helps in isolating the boiler from the common header in case of any emergency or maintenance requirements.

    Rate this question:

  • 10. 

    1. A 10 x 5x 15 duplex reciprocating pump has a steam cylinder diameter of ____inches, has a water cylinder diameter of _____ inches, and a long stroke of _____inches.

    • 10, 5, 15

    • 15, 5, 10

    • 5,10, 15

    • 20, 10, 30

    Correct Answer
    A. 10, 5, 15
    Explanation
    The given answer states that the steam cylinder diameter is 10 inches, the water cylinder diameter is 5 inches, and the long stroke is 15 inches. This suggests that the dimensions of the reciprocating pump are such that the steam cylinder has a larger diameter compared to the water cylinder, and the stroke length is longer than the cylinder diameters.

    Rate this question:

  • 11. 

    1. ______________ is the deterioration of the boiler metal by a chemical reaction.

    • Fatigue

    • Distress

    • Corrosion

    • Degradation

    Correct Answer
    A. Corrosion
    Explanation
    Corrosion is the process in which the boiler metal deteriorates due to a chemical reaction. This reaction can occur when the metal is exposed to oxygen, water, and other corrosive substances, leading to the formation of rust or other corrosive compounds. Corrosion can weaken the metal, causing it to lose its structural integrity and potentially leading to leaks or other failures in the boiler system.

    Rate this question:

  • 12. 

    1. A British thermal unit, BTU, is the amount of heat that need to raise the temperature on one ___________ of water one _________ _______________.

    • Pound, degree, farenheit

    • Gallon, degree, farenheit

    • Liter, degree, celsius

    • Kilogram, degree, celsius

    Correct Answer
    A. Pound, degree, farenheit
    Explanation
    A British thermal unit (BTU) is a unit of measurement used to quantify the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit.

    Rate this question:

  • 13. 

    1. The _____________ on the refrigeration system absorbs the heat from the space.

    • Condensor

    • Evaporator

    • Compressor

    • Metering device

    Correct Answer
    A. Evaporator
    Explanation
    The evaporator is the component in the refrigeration system that absorbs heat from the space. As the refrigerant passes through the evaporator, it evaporates and absorbs heat from the surrounding air or space, causing the temperature to decrease. This cooled refrigerant is then sent to the compressor to be pressurized and circulated back into the system.

    Rate this question:

  • 14. 

    1. A _______________ ____________ air handler unit operates at the rated capacity at all times.

    • Variable Volume

    • Constant Volume

    • Single Zone

    • Multi-Zone

    Correct Answer
    A. Constant Volume
    Explanation
    A constant volume air handler unit operates at the rated capacity at all times, meaning that it consistently delivers a fixed volume of air. This type of air handler unit is typically used in buildings where the air conditioning or heating requirements do not vary significantly throughout the day or year. The unit's fan runs at a constant speed, providing a consistent airflow and temperature to the space it serves. This design is often more energy-efficient and easier to control compared to variable volume air handler units, which can adjust their airflow based on demand.

    Rate this question:

  • 15. 

    1. ______ ________________ are used extensively in pulverized-fuel-burning plants in order to keep heat-absorbing surfaces free from soot and ash buildup.

    • Soot Blowers

    • Stack Scrubbers

    • Chain Grate Stokers

    • Tube puncher

    Correct Answer
    A. Soot Blowers
    Explanation
    Soot blowers are used extensively in pulverized-fuel-burning plants to keep heat-absorbing surfaces free from soot and ash buildup. Soot and ash can accumulate on these surfaces, reducing their efficiency and potentially causing damage. Soot blowers use high-pressure steam or compressed air to remove the buildup, ensuring that the surfaces remain clean and heat transfer is optimized. This helps to maintain the overall efficiency and performance of the plant.

    Rate this question:

  • 16. 

    1. Sulfur in the soot then unites with moisture from condensation to produce a ____________ ________.

    • Sulfurous acid

    • Heavy soot

    • Toxic gas

    • Yellowish smoke

    Correct Answer
    A. Sulfurous acid
    Explanation
    When sulfur in the soot combines with moisture from condensation, it forms sulfurous acid. This reaction occurs when the sulfur in the soot reacts with water vapor in the air, resulting in the formation of sulfurous acid. Sulfurous acid is a weak acid that is commonly found in polluted air and can contribute to acid rain.

    Rate this question:

  • 17. 

    1. A dry pipe on a Scotch Marine Boiler is used to remove _____________ from the steam prior to leaving the boiler.

    • Moisture

    • Oxygen

    • Air

    • CO2

    Correct Answer
    A. Moisture
    Explanation
    A dry pipe on a Scotch Marine Boiler is used to remove moisture from the steam prior to leaving the boiler. This is important because excessive moisture in the steam can cause damage to the piping system and reduce the efficiency of the boiler. By removing moisture, the dry pipe helps to ensure that the steam is dry and of high quality, which is necessary for various industrial processes.

    Rate this question:

  • 18. 

    1. The color of Cylinder containing R -22 is ___________ ________ before 2020.

    • Orange

    • White

    • Light Green

    • Coral Red

    Correct Answer
    A. Light Green
    Explanation
    The color of the cylinder containing R-22 is light green before 2020.

    Rate this question:

  • 19. 

    1. The hot gases from the furnace pass into a blank lined combustion chamber on a dry back scotch marine boiler.

    • Refractory

    • Insulation

    • Creosote

    • Concrete

    Correct Answer
    A. Refractory
    Explanation
    In a dry back scotch marine boiler, the hot gases from the furnace enter a combustion chamber. This combustion chamber is lined with refractory material. Refractory is a type of heat-resistant material that can withstand high temperatures without melting or deforming. It is used in boilers to protect the surrounding structure from the extreme heat generated by the combustion process. The refractory lining helps to maintain the efficiency and durability of the boiler by preventing heat loss and minimizing damage to the surrounding components.

    Rate this question:

  • 20. 

    1. Cogeneration plants sell ____________ to the local industrial plants, and _____________ to the local __________.

    • Fuel oil, steam, power plants

    • Steam, condensate, cogeners

    • Propane, fuel oil, utilities

    • Steam, electricity, utilities

    Correct Answer
    A. Steam, electricity, utilities
    Explanation
    Cogeneration plants sell steam and electricity to the local utilities.

    Rate this question:

  • 21. 

    1. The low water fuel cut-off will shut off the fuel to the burner before the water drops below the safe permissible level, and thus prevent ______________ damage to the boiler.

    • Shear

    • Pressure

    • Fire

    • Overheating

    Correct Answer
    A. Overheating
    Explanation
    The low water fuel cut-off is designed to shut off the fuel supply to the burner when the water level in the boiler drops below a safe level. This prevents overheating of the boiler, which can cause serious damage.

    Rate this question:

  • 22. 

    1. A _________ _______AHU has heating and cooling coils located at the different zones. It uses air dampers from the hot and cold ducts to maintain zone comfort.

    • Variable Volume

    • Constant Volume

    • Single Zone

    • Multi Zone

    Correct Answer
    A. Multi Zone
    Explanation
    A Multi Zone AHU has heating and cooling coils located at different zones, allowing for individual temperature control in each zone. It uses air dampers from the hot and cold ducts to maintain comfort in each zone. This type of AHU is ideal for buildings with multiple areas that require different temperature settings.

    Rate this question:

  • 23. 

    1. The lowest visible water level in the gauge glass is ___ above the top of the boiler tubes on a scotch marine boiler.

    • 2"

    • 3"

    • 12"

    • 6"

    Correct Answer
    A. 2"
    Explanation
    The lowest visible water level in the gauge glass is 2" above the top of the boiler tubes on a scotch marine boiler. This is important because it ensures that there is enough water in the boiler to prevent overheating and damage to the tubes. It also allows for proper monitoring and maintenance of the water level in the boiler.

    Rate this question:

  • 24. 

    1. A _______________ is a U-tube draft gauge to measure the differential pressure between two points.

    • Manometer

    • Balometer

    • Pyrometer

    • Draft meter

    Correct Answer
    A. Manometer
    Explanation
    A manometer is a U-tube draft gauge used to measure the differential pressure between two points. It consists of a U-shaped tube partially filled with a liquid, such as mercury or water. The pressure difference between the two points causes the liquid to rise or fall in one side of the tube, indicating the pressure difference. Manometers are commonly used in various applications, such as measuring gas pressure, airflow, and fluid levels.

    Rate this question:

  • 25. 

    1. When using a lift lever to manually test a safety valve, the boiler pressure must be at least _____ percent of the safety valve setpoint.

    • 80

    • 75

    • 70

    • 90

    Correct Answer
    A. 75
    Explanation
    When using a lift lever to manually test a safety valve, the boiler pressure must be at least 75 percent of the safety valve setpoint. This is because the lift lever test is performed to ensure that the safety valve is functioning properly and can relieve excess pressure in the boiler. By testing at 75 percent of the setpoint, it ensures that the safety valve will open and relieve pressure when it reaches the setpoint, providing a safety measure for the boiler system.

    Rate this question:

  • 26. 

    1. The presence of __________ ______________ in the flue gas in an indication of incomplete combustion.

    • Nitrogen

    • Sulfuric acid

    • Carbon monoxide

    • Oxygen

    Correct Answer
    A. Carbon monoxide
    Explanation
    Carbon monoxide is produced during incomplete combustion, where there is insufficient oxygen available to fully burn the fuel. The presence of carbon monoxide in the flue gas is therefore an indication that the combustion process was not complete. Incomplete combustion can lead to the release of harmful pollutants and can also result in lower energy efficiency.

    Rate this question:

  • 27. 

    1. In conduction the transfer of heat from one material to another occurs due to direct _________.

    • Convetion

    • Contact

    • Proximity

    • Touching

    Correct Answer
    A. Contact
    Explanation
    In conduction, the transfer of heat occurs due to direct contact between two materials. When two objects are in contact, heat energy is transferred from the hotter object to the colder object through molecular collisions. This process continues until both objects reach thermal equilibrium, with the heat evenly distributed between them. Therefore, contact is the correct answer as it accurately describes the mechanism of heat transfer in conduction.

    Rate this question:

  • 28. 

    1. _______ drum below the rear headers was used to collect sediment and was blown out from time to time.

    • Mud

    • Sludge

    • Drip

    • Blow-down

    Correct Answer
    A. Mud
    Explanation
    The correct answer is mud. The drum below the rear headers was used to collect sediment, specifically mud, and was blown out from time to time.

    Rate this question:

  • 29. 

    1. ______________ BTU’s per hour output is one boiler horsepower.

    • 33,475

    • 33,826

    • 66,826

    • 27,475

    Correct Answer
    A. 33,475
    Explanation
    One boiler horsepower is equivalent to 33,475 BTU's per hour output.

    Rate this question:

  • 30. 

    1. Welding a flat strip of metal between the waterwall tubes is known as ____________ wall construction.

    • Tube

    • Membrane

    • Refractory

    • Braced

    Correct Answer
    A. Membrane
    Explanation
    Welding a flat strip of metal between the waterwall tubes is known as membrane wall construction. This type of construction involves creating a continuous, sealed membrane of metal that separates the water and steam from the combustion gases in a boiler. The membrane wall helps to improve the efficiency and performance of the boiler by providing a barrier between the two fluids and ensuring proper heat transfer.

    Rate this question:

  • 31. 

    1. The two types of electric boilers are _______________ and ______________.

    • Resistance & electrode

    • Resistance & capacitance

    • Arc Tube & electrode

    • Electrode & capacitance

    Correct Answer
    A. Resistance & electrode
    Explanation
    The correct answer is resistance & electrode. Electric boilers can be categorized into two types based on their heating elements: resistance and electrode. Resistance boilers use electrical resistance to generate heat, while electrode boilers use electric current passing through water to produce heat.

    Rate this question:

  • 32. 

    1. The three classes of feedwater pumps are _______________, _______________, and _____________.

    • Reciprocating, centrifugal, and rotary

    • Reciprocating, centrifugal, and screw

    • Reciprocating, scroll, and centrifugal

    • Positive displacement, reciprocating, and centrifugal

    Correct Answer
    A. Reciprocating, centrifugal, and rotary
    Explanation
    The correct answer is "reciprocating, centrifugal, and rotary". These three classes refer to different types of feedwater pumps. Reciprocating pumps use a piston or plunger to create pressure and move the fluid. Centrifugal pumps use centrifugal force to move the fluid and are commonly used in industrial applications. Rotary pumps use rotating mechanisms to move the fluid, such as gears or vanes. Therefore, the correct answer includes all three types of pumps.

    Rate this question:

  • 33. 

    1. The minimum size of the piping between the boiler and the water column is____.

    • 1.5"

    • 2.5"

    • 1"

    • 3/4"

    Correct Answer
    A. 1"
    Explanation
    The minimum size of the piping between the boiler and the water column is 1".

    Rate this question:

  • 34. 

    1. _______________ is when water or impurities leave the boiler with the steam.

    • Carryover

    • Priming

    • Entraintment

    • Foaming

    Correct Answer
    A. Carryover
    Explanation
    Carryover is the term used to describe the situation when water or impurities are carried out of the boiler along with the steam. This can happen due to factors such as high steam velocities, inadequate separation equipment, or excessive boiler water levels. Carryover can lead to various problems, including damage to downstream equipment, reduced steam quality, and decreased efficiency of the system.

    Rate this question:

  • 35. 

    1. A device used to reduce the temperature of superheated steam to a lower desired temperature is a _______________________.

    • Chiller

    • Thermal recovery unit

    • Supercooler

    • Desuperheater

    Correct Answer
    A. Desuperheater
    Explanation
    A desuperheater is a device used to reduce the temperature of superheated steam to a lower desired temperature. It achieves this by injecting a coolant or a liquid into the superheated steam, which absorbs the excess heat and cools down the steam. This process is commonly used in industrial applications where the temperature of the steam needs to be controlled for various purposes, such as preventing damage to equipment or improving the efficiency of a system.

    Rate this question:

  • 36. 

    1. The flow of heat through electromagnetic waves is known as _________________.

    • Induction

    • Convection

    • Radiation

    • Dissonance

    Correct Answer
    A. Radiation
    Explanation
    Radiation is the correct answer because it refers to the flow of heat through electromagnetic waves. Unlike convection and induction, which involve the transfer of heat through physical contact or movement of particles, radiation involves the transfer of heat through electromagnetic waves, such as infrared radiation. Dissonance is unrelated to the flow of heat.

    Rate this question:

  • 37. 

    1. When the boiler steam pressure reaches setpoint of the main scale of the operating control, the burner will turn _______.

    • Off

    • On

    • Critical

    • Down

    Correct Answer
    A. Off
    Explanation
    When the boiler steam pressure reaches the setpoint of the main scale of the operating control, the burner will turn off. This is because the setpoint is the desired or target pressure, and once it is reached, the burner is no longer needed to generate more steam. Turning off the burner helps to maintain the pressure within the desired range and prevent overpressure in the boiler.

    Rate this question:

  • 38. 

    1. The modulating control controls the ___________ ________ of the burner.

    • Firing rate

    • Rate of modulation

    • Secondary air

    • Air intake

    Correct Answer
    A. Firing rate
    Explanation
    The modulating control is responsible for controlling the firing rate of the burner. It adjusts the amount of fuel being supplied to the burner based on the desired heat output. By regulating the firing rate, the modulating control ensures that the burner operates at the desired level of heat production, allowing for precise temperature control.

    Rate this question:

  • 39. 

    1. The test most commonly used for determining wall thickness of pipes or flat plate is an ___________________ test.

    • Visual

    • Ultrasonic

    • Radiographic

    • Magnetic particle

    Correct Answer
    A. Ultrasonic
    Explanation
    The test most commonly used for determining wall thickness of pipes or flat plate is an ultrasonic test. Ultrasonic testing involves the use of high-frequency sound waves to detect internal flaws or measure the thickness of materials. It is a non-destructive testing method that is often used in industries such as oil and gas, manufacturing, and construction to ensure the integrity and safety of structures and equipment.

    Rate this question:

  • 40. 

    1. The _____________ on the refrigeration system rejects the heat from the system.

    • Condenser

    • Evaporator

    • Compressor

    • Metering device

    Correct Answer
    A. Condenser
    Explanation
    The condenser is responsible for rejecting the heat from the refrigeration system. It is a component that helps in the cooling process by transferring heat from the refrigerant to the surrounding environment. This is done by condensing the refrigerant vapor into a liquid state, releasing heat in the process.

    Rate this question:

  • 41. 

    1. A slow opening blowdown valve must complete _____ turns between full open and full shut.

    • 3

    • 2

    • 5

    • 4

    Correct Answer
    A. 5
  • 42. 

    1. In a ___________ water softener, calcium and magnesium ions are exchanged for sodium ions. The result is a soft salt sludge that can be easily removed by bottom blowdown.

    • Zeolite

    • Sodium bicabonate

    • Activated carbon

    • Ion exchange

    Correct Answer
    A. Zeolite
    Explanation
    In a zeolite water softener, calcium and magnesium ions are exchanged for sodium ions. Zeolite is a type of mineral with a porous structure that allows it to trap and exchange ions. When hard water passes through the zeolite resin bed, the calcium and magnesium ions are attracted to the zeolite and are replaced by sodium ions. This process effectively softens the water by reducing the concentration of calcium and magnesium ions. The softened water then flows out of the system, while the calcium and magnesium ions are retained in the zeolite resin bed, forming a soft salt sludge that can be easily removed by bottom blowdown.

    Rate this question:

  • 43. 

    1. A solution is said to be ______________ when it can no longer dissolve anymore impurities.

    • Logged

    • Nullified

    • Super Saturated

    • Saturated

    Correct Answer
    A. Saturated
    Explanation
    A solution is said to be saturated when it has reached its maximum capacity to dissolve any more impurities. In other words, it cannot dissolve any additional solute at a given temperature and pressure.

    Rate this question:

  • 44. 

    1. Fire tube boilers are likely to leak due to cracking, burning and corrosion of the _________ _________.

    • Stay braces

    • Stay bolts

    • Tube ends

    • Boiler shell

    Correct Answer
    A. Tube ends
    Explanation
    Fire tube boilers are likely to leak due to cracking, burning, and corrosion of the tube ends. The tube ends are the parts of the boiler where the tubes connect to the boiler shell. Over time, the intense heat and pressure in the boiler can cause the tube ends to become weakened and damaged. This can lead to cracks, burning, and corrosion, which can result in leaks in the boiler. Regular maintenance and inspection of the tube ends are necessary to prevent these issues and ensure the safe and efficient operation of the boiler.

    Rate this question:

  • 45. 

    1. _____ ______ are a potential source of oil contamination of the water side of a boiler.

    • Water source condensors

    • Fuel radiators

    • Zeolite softeners

    • Oil heaters

    Correct Answer
    A. Oil heaters
    Explanation
    Oil heaters are a potential source of oil contamination of the water side of a boiler. This is because oil heaters are used to heat oil, and if there is any leakage or malfunction in the oil heating system, it can result in oil entering the water side of the boiler. This can lead to contamination of the boiler water, which can negatively impact the efficiency and performance of the boiler. Therefore, it is important to regularly inspect and maintain oil heaters to prevent any oil contamination issues.

    Rate this question:

  • 46. 

    1. _____________ is the replacement for refrigerant R-22.

    • R-410a

    • R-134a

    • R-401a

    • R-123

    Correct Answer
    A. R-410a
    Explanation
    R-410a is the replacement for refrigerant R-22. Refrigerant R-22 is being phased out due to its harmful effects on the ozone layer. R-410a is a more environmentally friendly alternative that does not contribute to ozone depletion. It is commonly used in air conditioning systems as a refrigerant.

    Rate this question:

  • 47. 

    1. A stay that is shorter than 8” and threaded is required to have a blank

    • Tell tale hole

    • Stay brace

    • Riveted connection

    • Bolt brace

    Correct Answer
    A. Tell tale hole
    Explanation
    A stay that is shorter than 8" and threaded is required to have a tell tale hole.

    Rate this question:

  • 48. 

    1. The waste products from a sugar cane are used in a _______________ plant.

    • Bagasse

    • Black liquor

    • Red liquor

    • Saccarine refinery

    Correct Answer
    A. Bagasse
    Explanation
    Bagasse is the fibrous residue left after extracting juice from sugar cane. It is a byproduct of the sugar cane industry and is commonly used as a fuel in power plants. Therefore, the waste products from sugar cane, which include bagasse, are used in a power plant.

    Rate this question:

  • 49. 

    1. __________ _________ is the temperature at which fuel oil will give off vapor that will ignite when exposed to an open flame.

    • Flash point

    • Smoke point

    • Fire point

    • Vaporization point

    Correct Answer
    A. Flash point
    Explanation
    The flash point is the temperature at which fuel oil will give off vapor that will ignite when exposed to an open flame.

    Rate this question:

Quiz Review Timeline (Updated): Apr 29, 2024 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Apr 29, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 18, 2018
    Quiz Created by
    Mike Jewel

Recent Quizzes

Stationary Engineer Trivia Quiz Stationary Engineer Trivia Quiz
What Do You Know About 3rd Grade Stationary Engineer? What Do You Know About 3rd Grade Stationary Engineer?
Magnetic Particle Testing: Principles and Practice Quiz Magnetic Particle Testing: Principles and Practice Quiz
Railway Engineering MCQ Quiz Railway Engineering MCQ Quiz
CEA GATE PRACTICE SERIES TEST CEA GATE PRACTICE SERIES TEST
ANTENNA AND MICROWAVE ENGINEERING- REVISION QUIZ ANTENNA AND MICROWAVE ENGINEERING- REVISION QUIZ
Back to Top Back to top
Advertisement
×

Wait!
Here's an interesting quiz for you.

We have other quizzes matching your interest.