Visvesvaraya Technological University (VTU) 2005 B.E Mechanical Engineering Elements of y/ust - Question Paper

ans any 5 full ques.
1.a)define:
~dryness fraction.
~superheated steam.
b)A steam is at 9bar and dryness fraction 0.98.find the quality and temperature of the steam when
~the steam looses 50kj/kg at constant pressure.
~the steam receives 150kj/kg at constant pressure.
c)with a neat sketch discuss the functioning of a tidal power plant.

2.a)how are steam turbines classified?
b)list out the differences ranging from impulse and hydraulic turbine.
c)with a neat sketch discuss the operation of a closed cycle gas turbine.

3.a)How are I.C engine classified?
b)with a neat sketch discuss the working of a 4stroke compression ignition engine.
c)A single cylinder,two stroke ic engine has a piston of dia 105mm and stroke 120mm.The mean effective pressure is six bar.If the crank speed is 1500rpm,calculate the indicated power of the engine.

4.a)distinguish ranging from refrigeration and airconditioning
b)with a schematic diagram discuss the working of a vapour compression refrigerator.
c)list and discuss with sketches the operations that can be performed on a drilling machine.

5.a)distinguish ranging from brazing and welding.
b)with neat sketches discuss the various kinds of flames used in gas welding and specify their application.
c)list out the properties of a good lubricant and discuss any 2 methods of lubrication.

6.a)list out the various operations that can be performed on a centre lathe.
b)with neat sketches discuss any 2 methods of taper turning.
c)with a neat diagram discuss the working of a vertical milling machine.

7.a)distinguish ranging from open belt drive and cross belt drive.
b)two pulleys are connected by across belt the velocity ratio of the drive being 3.The driver runs at 1000rpm and has a dta of 120cm obtain the speed and dia of the driver pulley.
c)with a block diagram discuss the working of a closed loop control system.

8.write short notes on any 4 of the following:
a)flux in soldering
b)simple carborator
c)injector
d)centreless grinding
e)bearing and their classification
f)gear drives.

Earning:   Approval pending.