please give me the ans. of following mcq
A nozzle is a device which:
(A) Increase pressure & reduce kinetic energy
(B) Decreases pressure & increases kinetic energy
(C) Reduces both pressure & kinetic energy
(D) Increases both pressure & kinetic energy
- 7 Answers
- 10677 Views
- I also Faced
- E-Mail Answers
Answer Posted / newgradengineer
|-------
FR1=A1V1 | \ FR2 =A2V2
----->| | ----->
P1V1=nRT1 | / P2V2 = nRT2
|-------
FR = flow rate
since this is a close system, FR1 = FR2
A1V1 = A2V2
-> A1/A2 = V2/V1 Since A1/A2 > 1 --> V2/V1 > 1 or V2>V1
Kinetic Energy = 1/2*m*v^2. Higher velocity gives higher
kinetic energy
We have P1V1 = nRT1 and P2V2 = nRT2
Assume there is no change in T
---> P1V1 = P2V2
---> P1/P2 = V2/V1 since V2/V1 > 1 --> P1/P2 >1 or P1>P2
(B) decreases pressure and increases kinetic energy is the
correct answer
| Is This Answer Correct ? | 12 Yes | 0 No |
Post New Answer View All Answers
What is mean by greenfield project?
how many types of suspensions are used in automobiles?
plz anyone provide me the sample test papers of ONGC as of i m from Mechanical engg bakground and would be appearing for the test in the june 2010. My email id - neeraj_94312@rediffmail.com
WHat is adsl?
What is the device that converts sound energy into mechanical energy?
can u give me model question papers for exam preparation .
What is isometric drawing?
Define cotter joint?
Inspection for intermediate shaft bearing.
my dear friends i want to know about pattern of HPCL & SAIL written exam papers. so please send me the details.
What are the causes of steam turbine failure?
Steering handle (round dial) of motor vehicles (CAR,BUS,LORRY) wiil be designing with two cross supports without 180 degree straightness( it will be little bit cross). Why?
What do you analyze from boiler water analysis?
Discuss various surface finishing processes?
How pipe flanges are electrically insulated?
