Sign Up


Have an account? Sign In Now

Sign In


Forgot Password?

Don't have account, Sign Up Here

Forgot Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.


Have an account? Sign In Now

Sorry, you do not have permission to ask a question, You must login to ask a question.


Forgot Password?

Need An Account, Sign Up Here

You must login to ask a question.


Forgot Password?

Need An Account, Sign Up Here

Please briefly explain why you feel this question should be reported.

Please briefly explain why you feel this answer should be reported.

Please briefly explain why you feel this user should be reported.

Sign InSign Up

The Mechanical Engineer

The Mechanical Engineer Navigation

  • Home
  • Subjects
    • Fluid & Thermal
    • Machine Design
    • Material Science & Manufacturing
  • Quiz
    • Quiz in Fluid & Thermal
    • Quiz in Machine Design
    • Quiz in Material Science & Manufacturing
    • Quiz in Nuclear Science and Engineering
  • Interview Questions
  • Industry
  • Vibration Analysis
  • Nuclear Engineering
  • Career
  • Engineering Disasters
Search
Ask A Question

Mobile menu

Close
  • Home
  • Add group
  • Polls
  • Messages
  • Joined Groups
  • Questions
  • Badges
  • Catergories
  • Groups
  • Tags
  • Users
  • Home
  • Subjects
    • Fluid & Thermal
    • Machine Design
    • Material Science & Manufacturing
  • Quiz
    • Quiz in Fluid & Thermal
    • Quiz in Machine Design
    • Quiz in Material Science & Manufacturing
    • Quiz in Nuclear Science and Engineering
  • Interview Questions
  • Industry
  • Vibration Analysis
  • Nuclear Engineering
  • Career
  • Engineering Disasters

The Mechanical Engineer

Ask The Mechanical Engineer
971 Visits
0 Followers
2 Questions
Home/ The Mechanical Engineer/Answers
  • About
  • Questions
  • Polls
  • Answers
  • Best Answers
  • Groups
  • Joined Groups
  • Managed Groups
  1. Asked: November 23, 2023In: Vibration Analysis

    What is the orthogonality principle in vibration?

    The Mechanical Engineer
    Added an answer on November 23, 2023 at 7:54 pm

    Orthogonal means that two things are at right angles to each other. When we say two vectors are orthogonal, it means they're perpendicular, forming a 90-degree angle. This shows that these vectors are independent—they don't affect each other's movement. The vectors are completely unrelated or uncorrRead more

    Orthogonal means that two things are at right angles to each other. When we say two vectors are orthogonal, it means they’re perpendicular, forming a 90-degree angle. This shows that these vectors are independent—they don’t affect each other’s movement. The vectors are completely unrelated or uncorrelated in terms of their direction. The motion of one vector does not interfere or interact with another vector. Hence, they can be evaluated or calculated independently since there is no relation between them.

    Similarly, the modes or mode shapes in a vibrating body are said to be orthogonal because the shape and characteristics of one mode do not influence or interact with other modes. Hence, they can be evaluated independently and separately. This idea leads to what we call the mode superposition principle.

    That’s why the off-diagonal elements of the decoupled equations of motion (decoupled using modal orthogonal property) are zero.

     

    See less
      • 0
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
  2. Asked: November 1, 2022In: Lubricating oil

    What is the difference between pouring point and flashing point of a lubricating oil?

    The Mechanical Engineer
    Added an answer on November 2, 2022 at 7:28 pm

    Flash Point: In the presence of an ignitable source, this is the lowest temperature at which a volatile flammable substance's vapour may ignite in the air. More vapour may not be created quickly enough to continue burning at the flash point. The flash point of a liquid is used to determine how volatRead more

    Flash Point:

    In the presence of an ignitable source, this is the lowest temperature at which a volatile flammable substance’s vapour may ignite in the air. More vapour may not be created quickly enough to continue burning at the flash point. The flash point of a liquid is used to determine how volatile it is.

    Fire Point:

    After the vapours have been ignited and the ignition source removed, this is the lowest temperature at which a volatile flammable material continues to burn in air.

    See less
      • 0
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
  3. Asked: November 1, 2022In: Motor

    What does motor frame size ND160L represents? What is the frame size of induction motor?

    The Mechanical Engineer
    Added an answer on November 2, 2022 at 7:27 pm

    If an existing motor is to be replaced with a new motor for the same driven system, the following things should be matched. The vertical distance between the ground and the center of the motor shaft. The distance between motor foot bolt holes lying parallel and perpendicular to the shaft axis must bRead more

    If an existing motor is to be replaced with a new motor for the same driven system, the following things should be matched.

    1. The vertical distance between the ground and the center of the motor shaft.
    2. The distance between motor foot bolt holes lying parallel and perpendicular to the shaft axis must be the same.
    3. The power rating should be the same.

    To ease the above process, International Electrotechnical Commission (IEC) standardized the motor frame size with a frame code.

    For example, FRAME ND 160L is engraved in the motor nameplate, 160 represents the vertical distance between the ground and the center of the motor shaft, L represents “large”. L for large, S for short, and M for medium represents the extent of the distance between two bolt holes lying parallel to the axis of the motor shaft.

    See less
      • -2
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
  4. Asked: November 1, 2022In: Centrifugal pump

    What is the difference between shroud and back plate of an impeller?

    The Mechanical Engineer
    Added an answer on November 2, 2022 at 7:25 pm

    Consider a closed impeller to which plates are welded on both sides of the impeller as shown in the following figure. These plates are called shrouds. The back shroud is also called as back plate.  

    Consider a closed impeller to which plates are welded on both sides of the impeller as shown in the following figure. These plates are called shrouds. The back shroud is also called as back plate.

     

    See less
      • 0
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
  5. Asked: October 31, 2022In: Centrifugal fan

    Why Mean Sea Level Elevation is a necessary specification while purchasing a new centrifugal fan/blower?

    The Mechanical Engineer
    Added an answer on October 31, 2022 at 9:41 pm

    The density of atmospheric air is a function of altitude. The relation between the density of air and altitude can be seen in the following figure. The total pressure developed by a centrifugal fan consists of static pressure and dynamic pressure. The dynamic pressure is directly proportional to theRead more

    The density of atmospheric air is a function of altitude. The relation between the density of air and altitude can be seen in the following figure.

    The total pressure developed by a centrifugal fan consists of static pressure and dynamic pressure. The dynamic pressure is directly proportional to the density of air media as shown in the following relation.

    Hence if the density of air changes with the altitude, the total pressure generated by the centrifugal fan also changes.

     

    See less
      • 0
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
  6. Asked: October 31, 2022In: Centrifugal fan

    What are the usual air temperature and pressure settings used for testing the performance of a centrifugal fan?

    The Mechanical Engineer
    Added an answer on October 31, 2022 at 9:36 pm

    In general, when a supplier performs a performance test on a centrifugal fan before engraving the nameplates, Normal Temperature and Pressure (NTP) is utilized as a standard condition. Because the density of air changes with altitude and temperature, the capacity, i.e., the mass flow rate of air (KgRead more

    In general, when a supplier performs a performance test on a centrifugal fan before engraving the nameplates, Normal Temperature and Pressure (NTP) is utilized as a standard condition. Because the density of air changes with altitude and temperature, the capacity, i.e., the mass flow rate of air (Kg/s) through the fan changes.

     

    NTP: Temperature is 20°C

    Pressure is 1atm (101.325 Kpa)

    See less
      • 0
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
  7. Asked: October 31, 2022In: Reciprocating compressor

    9. Why does the increased intake air temperature increase the power consumption of a reciprocating compressor?

    The Mechanical Engineer
    Added an answer on October 31, 2022 at 9:35 pm

    The temperature rise is inversely proportional to air density. i.e., the density of air reduces as the temperature rises. For a given amount of air, a decrease in density causes an increase in volume, implying that air takes up more space. Every compression stroke of a reciprocating compressor displRead more

    The temperature rise is inversely proportional to air density. i.e., the density of air reduces as the temperature rises. For a given amount of air, a decrease in density causes an increase in volume, implying that air takes up more space. Every compression stroke of a reciprocating compressor displaces a fixed volume of air. Because of the decrease in density and a fixed volume of a cylinder, the compressor requires a greater number of strokes to reach the predetermined pressure level in the receiver tank. Thus, power consumption increases.

    See less
      • 0
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
  8. Asked: October 31, 2022In: Centrifugal pump

    What is the recommended temperature of lubricating oil used in a centrifugal pump?

    The Mechanical Engineer
    Added an answer on October 31, 2022 at 9:34 pm

    The temperature of oil in the bearing chamber of centrifugal pump must be more than recommended pouring point and less than recommended flash point of a particular chosen oil grade.

    The temperature of oil in the bearing chamber of centrifugal pump must be more than recommended pouring point and less than recommended flash point of a particular chosen oil grade.

    See less
      • 0
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
  9. Asked: October 14, 2022In: Fluid & Thermal

    Why there is a loss in dynamic pressure when air stream passes through nozzles, gates, orifices, coils…etc?

    The Mechanical Engineer
    Added an answer on October 14, 2022 at 9:34 pm

    Dynamic pressure can be calculated by using the relation, Dynamic Pressure=( ρV^2)/2 It’s nothing but kinetic energy per unit volume of flow. Velocity profiles of air stream reorganize at locations like nozzles, orifices, gates, and coils. etc following the formation of vortices/eddies resulting inRead more

    Dynamic pressure can be calculated by using the relation,
    Dynamic Pressure=( ρV^2)/2
    It’s nothing but kinetic energy per unit volume of flow. Velocity profiles of air stream reorganize at locations like nozzles, orifices, gates, and coils. etc following the formation of vortices/eddies resulting in the conversion of kinetic energy into heat. As a result, dynamic pressure is reduced.

    See less
      • 0
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
  10. Asked: October 14, 2022In: Roots blower

    Why the pressure relief valve installed at the discharge of every positive displacement type blower?

    The Mechanical Engineer
    Added an answer on October 14, 2022 at 9:34 pm

    Positive displacement type blowers like roots and compressors like piston type, screw type. Etc are equipped with a relief valve at their discharges because the motor power is determined by the pressure developed. In case of any blockage in the pipelines that leads to motor burnout. Unlike in centriRead more

    Positive displacement type blowers like roots and compressors like piston type, screw type. Etc are equipped with a relief valve at their discharges because the motor power is determined by the pressure developed. In case of any blockage in the pipelines that leads to motor burnout. Unlike in centrifugal fans where the power consumption is determined by the volume flow rate.

    See less
      • 0
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
1 2

Sidebar

Ask A Question

Stats

  • Questions 118
  • Answers 112
  • Posts 58
  • Best Answer 1
  • Popular
  • Answers
  • The Mechanical Engineer

    Why is Refrigeration Capacity expressed in Tons?

    • 1 Answer
  • Peter

    How to calculate the power requirement of a centrifugal fan?

    • 1 Answer
  • Peter

    How to calculate the mechanical efficiency of a centrifugal fan?

    • 1 Answer
  • Peter

    What is static pressure of a centrifugal fan and its ...

    • 1 Answer
  • Peter

    Why the pressure relief valve installed at the discharge of ...

    • 1 Answer
  • johncarter
    johncarter added an answer S1 and S2 level earthquakes are designations you might encounter… April 4, 2024 at 7:58 pm
  • johncarter
    johncarter added an answer The main difference between an Operating Basis Earthquake (OBE) and… April 4, 2024 at 7:57 pm
  • johncarter
    johncarter added an answer Classification of Class-1,2,3 components of ASME Section III Division I… April 2, 2024 at 7:06 pm
  • johncarter
    johncarter added an answer Based on the above graph, the following results are made.… April 1, 2024 at 8:35 pm
  • johncarter
    johncarter added an answer Seismic Waves: Seismology is the study of earthquakes and seismic… April 1, 2024 at 8:33 pm

Users

Mila Lopez

Mila Lopez

  • 0 Questions
  • 0 Answers
EugeneCop

EugeneCop

  • 0 Questions
  • 0 Answers
Vyzvat_khpi

Vyzvat_khpi

  • 0 Questions
  • 0 Answers

Explore

  • Home
  • Add group
  • Polls
  • Messages
  • Joined Groups
  • Questions
  • Badges
  • Catergories
  • Groups
  • Tags
  • Users

Footer

The Mechanical Engineer

Amechieneer

Amechieneer is a social questions & Answers Engine which will help you establis your community and connect with other people.

Legal Stuff

  • About Us
  • Contact Us
  • Disclaimer
  • Privacy Policy
  • Terms and Condition

© 2022 Amechieneer. All Rights Reserved