Mechanical Engineering Exam  >  Mechanical Engineering Questions  >  An engine is tested by means of a water brake... Start Learning for Free
An engine is tested by means of a water brake at 1000 rpm. The measured torque-of the engine is 10000 Nm and the water consumption of the brake is 0.5 m3/s, its inlet temperature being 25°C. Assuming that the whole of the engine power is ultimately transferred into heat which is absorbed by the cooling water, what is the water temperature at exit?
  • a)
    22.5°C
  • b)
    23.5°C
  • c)
    24.5°C
  • d)
    25.5°C
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
An engine is tested by means of a water brake at 1000 rpm. The measure...
Engine power,
View all questions of this test
Most Upvoted Answer
An engine is tested by means of a water brake at 1000 rpm. The measure...
°C and outlet temperature being 50°C. Determine the power output of the engine.

Assuming that the water brake absorbs all the power output of the engine, the power output of the engine can be calculated as:

Power output = torque x angular velocity

where torque = 10000 Nm and angular velocity = 2π x 1000/60 = 104.72 rad/s

Power output = 10000 Nm x 104.72 rad/s = 1047200 W or 1047.2 kW

The water brake consumes 0.5 m3/s of water and the temperature difference across the brake is 25°C. Using the specific heat capacity of water (4.18 J/g°C) and the density of water (1000 kg/m3), the heat absorbed by the brake can be calculated as:

Heat absorbed = mass flow rate x specific heat capacity x temperature difference

where mass flow rate = volume flow rate x density = 0.5 m3/s x 1000 kg/m3 = 500 kg/s

Heat absorbed = 500 kg/s x 4.18 J/g°C x 25°C = 52350 kW

Since all the power output of the engine is absorbed by the water brake, the power output of the engine is equal to the heat absorbed by the brake:

Power output = 52350 kW

Therefore, the power output of the engine is 52350 kW.
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

Similar Mechanical Engineering Doubts

Top Courses for Mechanical Engineering

An engine is tested by means of a water brake at 1000 rpm. The measured torque-of the engine is 10000 Nm and the water consumption of the brake is 0.5 m3/s, its inlet temperature being 25°C. Assuming that the whole of the engine power is ultimately transferred into heat which is absorbed by the cooling water, what is the water temperature at exit?a)22.5°Cb)23.5°Cc)24.5°Cd)25.5°CCorrect answer is option 'D'. Can you explain this answer?
Question Description
An engine is tested by means of a water brake at 1000 rpm. The measured torque-of the engine is 10000 Nm and the water consumption of the brake is 0.5 m3/s, its inlet temperature being 25°C. Assuming that the whole of the engine power is ultimately transferred into heat which is absorbed by the cooling water, what is the water temperature at exit?a)22.5°Cb)23.5°Cc)24.5°Cd)25.5°CCorrect answer is option 'D'. 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 An engine is tested by means of a water brake at 1000 rpm. The measured torque-of the engine is 10000 Nm and the water consumption of the brake is 0.5 m3/s, its inlet temperature being 25°C. Assuming that the whole of the engine power is ultimately transferred into heat which is absorbed by the cooling water, what is the water temperature at exit?a)22.5°Cb)23.5°Cc)24.5°Cd)25.5°CCorrect answer is option 'D'. 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 An engine is tested by means of a water brake at 1000 rpm. The measured torque-of the engine is 10000 Nm and the water consumption of the brake is 0.5 m3/s, its inlet temperature being 25°C. Assuming that the whole of the engine power is ultimately transferred into heat which is absorbed by the cooling water, what is the water temperature at exit?a)22.5°Cb)23.5°Cc)24.5°Cd)25.5°CCorrect answer is option 'D'. Can you explain this answer?.
Solutions for An engine is tested by means of a water brake at 1000 rpm. The measured torque-of the engine is 10000 Nm and the water consumption of the brake is 0.5 m3/s, its inlet temperature being 25°C. Assuming that the whole of the engine power is ultimately transferred into heat which is absorbed by the cooling water, what is the water temperature at exit?a)22.5°Cb)23.5°Cc)24.5°Cd)25.5°CCorrect answer is option 'D'. 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 An engine is tested by means of a water brake at 1000 rpm. The measured torque-of the engine is 10000 Nm and the water consumption of the brake is 0.5 m3/s, its inlet temperature being 25°C. Assuming that the whole of the engine power is ultimately transferred into heat which is absorbed by the cooling water, what is the water temperature at exit?a)22.5°Cb)23.5°Cc)24.5°Cd)25.5°CCorrect answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of An engine is tested by means of a water brake at 1000 rpm. The measured torque-of the engine is 10000 Nm and the water consumption of the brake is 0.5 m3/s, its inlet temperature being 25°C. Assuming that the whole of the engine power is ultimately transferred into heat which is absorbed by the cooling water, what is the water temperature at exit?a)22.5°Cb)23.5°Cc)24.5°Cd)25.5°CCorrect answer is option 'D'. Can you explain this answer?, a detailed solution for An engine is tested by means of a water brake at 1000 rpm. The measured torque-of the engine is 10000 Nm and the water consumption of the brake is 0.5 m3/s, its inlet temperature being 25°C. Assuming that the whole of the engine power is ultimately transferred into heat which is absorbed by the cooling water, what is the water temperature at exit?a)22.5°Cb)23.5°Cc)24.5°Cd)25.5°CCorrect answer is option 'D'. Can you explain this answer? has been provided alongside types of An engine is tested by means of a water brake at 1000 rpm. The measured torque-of the engine is 10000 Nm and the water consumption of the brake is 0.5 m3/s, its inlet temperature being 25°C. Assuming that the whole of the engine power is ultimately transferred into heat which is absorbed by the cooling water, what is the water temperature at exit?a)22.5°Cb)23.5°Cc)24.5°Cd)25.5°CCorrect answer is option 'D'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice An engine is tested by means of a water brake at 1000 rpm. The measured torque-of the engine is 10000 Nm and the water consumption of the brake is 0.5 m3/s, its inlet temperature being 25°C. Assuming that the whole of the engine power is ultimately transferred into heat which is absorbed by the cooling water, what is the water temperature at exit?a)22.5°Cb)23.5°Cc)24.5°Cd)25.5°CCorrect answer is option 'D'. 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