Mechanical Engineering Exam  >  Mechanical Engineering Questions  >  A small steam whistle (perfectly insulated an... Start Learning for Free
A small steam whistle (perfectly insulated and doing no shaft work) causes a drop of 0.8 kJ/kg in enthalpy of steam from entry to exit. The kinetic energy of the steam at entry is negligible, the velocity of steam at exit is
  • a)
    4 m/s
  • b)
    40 m/s
  • c)
    80 m/s
  • d)
    120 m/s
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
A small steam whistle (perfectly insulated and doing no shaft work) ca...
Given data:
- Enthalpy drop of steam = 0.8 kJ/kg
- Kinetic energy at entry = negligible

Calculating the exit velocity:
- The enthalpy drop is due to the conversion of internal energy to kinetic energy at the exit.
- The enthalpy drop is equal to the increase in kinetic energy.
- We can use the equation: h1 - h2 = V2^2/2 - V1^2/2
- Given h1 - h2 = 0.8 kJ/kg and V1 = 0 m/s (negligible), we can solve for V2.

Solving for the exit velocity:
0.8 = V2^2/2 - 0
V2^2 = 2 * 0.8
V2 = sqrt(1.6) = 1.26 m/s

Answer:
- The exit velocity of steam is approximately 1.26 m/s.
- Among the given options, the closest answer is 40 m/s (option B).
Free Test
Community Answer
A small steam whistle (perfectly insulated and doing no shaft work) ca...
Attention Mechanical Engineering Students!
To make sure you are not studying endlessly, EduRev has designed Mechanical Engineering study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Mechanical Engineering.
Explore Courses for Mechanical Engineering exam

Top Courses for Mechanical Engineering

A small steam whistle (perfectly insulated and doing no shaft work) causes a drop of 0.8 kJ/kg in enthalpy of steam from entry to exit. The kinetic energy of the steam at entry is negligible, the velocity of steam at exit isa)4 m/sb)40 m/sc)80 m/sd)120 m/sCorrect answer is option 'B'. Can you explain this answer?
Question Description
A small steam whistle (perfectly insulated and doing no shaft work) causes a drop of 0.8 kJ/kg in enthalpy of steam from entry to exit. The kinetic energy of the steam at entry is negligible, the velocity of steam at exit isa)4 m/sb)40 m/sc)80 m/sd)120 m/sCorrect answer is option 'B'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about A small steam whistle (perfectly insulated and doing no shaft work) causes a drop of 0.8 kJ/kg in enthalpy of steam from entry to exit. The kinetic energy of the steam at entry is negligible, the velocity of steam at exit isa)4 m/sb)40 m/sc)80 m/sd)120 m/sCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A small steam whistle (perfectly insulated and doing no shaft work) causes a drop of 0.8 kJ/kg in enthalpy of steam from entry to exit. The kinetic energy of the steam at entry is negligible, the velocity of steam at exit isa)4 m/sb)40 m/sc)80 m/sd)120 m/sCorrect answer is option 'B'. Can you explain this answer?.
Solutions for A small steam whistle (perfectly insulated and doing no shaft work) causes a drop of 0.8 kJ/kg in enthalpy of steam from entry to exit. The kinetic energy of the steam at entry is negligible, the velocity of steam at exit isa)4 m/sb)40 m/sc)80 m/sd)120 m/sCorrect answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Mechanical Engineering. Download more important topics, notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free.
Here you can find the meaning of A small steam whistle (perfectly insulated and doing no shaft work) causes a drop of 0.8 kJ/kg in enthalpy of steam from entry to exit. The kinetic energy of the steam at entry is negligible, the velocity of steam at exit isa)4 m/sb)40 m/sc)80 m/sd)120 m/sCorrect answer is option 'B'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of A small steam whistle (perfectly insulated and doing no shaft work) causes a drop of 0.8 kJ/kg in enthalpy of steam from entry to exit. The kinetic energy of the steam at entry is negligible, the velocity of steam at exit isa)4 m/sb)40 m/sc)80 m/sd)120 m/sCorrect answer is option 'B'. Can you explain this answer?, a detailed solution for A small steam whistle (perfectly insulated and doing no shaft work) causes a drop of 0.8 kJ/kg in enthalpy of steam from entry to exit. The kinetic energy of the steam at entry is negligible, the velocity of steam at exit isa)4 m/sb)40 m/sc)80 m/sd)120 m/sCorrect answer is option 'B'. Can you explain this answer? has been provided alongside types of A small steam whistle (perfectly insulated and doing no shaft work) causes a drop of 0.8 kJ/kg in enthalpy of steam from entry to exit. The kinetic energy of the steam at entry is negligible, the velocity of steam at exit isa)4 m/sb)40 m/sc)80 m/sd)120 m/sCorrect answer is option 'B'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice A small steam whistle (perfectly insulated and doing no shaft work) causes a drop of 0.8 kJ/kg in enthalpy of steam from entry to exit. The kinetic energy of the steam at entry is negligible, the velocity of steam at exit isa)4 m/sb)40 m/sc)80 m/sd)120 m/sCorrect answer is option 'B'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
Explore Courses for Mechanical Engineering exam

Top Courses for Mechanical Engineering

Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev