Que: A footstep bearing and a rotor of a vertical turbine forms an example of

1. Incompletely constrained motion

2. Partially constrained motion

3. Completely constrained motion

4. Sucessfully constrained motion

Ans: 4
Explaination: There are six degree of freedon three translation

and three rotational and constarint motion is

 refered when pair of machine element are move or

 rotate in a required motion with unnessesary

 motion are restricted thats type of motion are

 called constrained motion in above example foot step bearing and rotor only 2 degree of freedom 1

rotation cw and acw and 1 translation up and

down but translation dof are restricted by gravity

 self wait of rotor so that type of constrain motion

 are called succesfully constrained motion.

Que: Which one of the following represents open thermodynamic system?
A) manual ice cream freezer.
B) centrifugal pump.
C) pressure cooker.
D) bomb calorimeter.

Ans: B
Explanation: as we know in open thermodynamic system heat and mass across the boundary so in centrifugal pump both are acrosed when other option A. Ice cream freezer. C. Pressure cooker and D. Bomb calorimeter no mass are transfered, so ans is centrifugal pump.

Que: What is drive speed & what is driven speed?

Ans: Speed related to main source where energy (k.e) are generated e.g in engine or turbine speed of main shaft are drive speed and where that k.e are used e.g for driving the wheel of vehicle or driving the generator shaft is the driven speed and generally both are same or nt same by means of gear mechanism.

Que: Suppose a steel bar of cross sectional area A is subjected to load P at one end and 2P at the other end ,what will be the induced

Ans: Internal stress induced, as we knw stress= force/area, in that case area remain same for both end of rod but force P and 2P are apply but resultant force is only P because resultant force= 2P-P= P, so induced stress = P/A which is either compressive or tensile bcs nature of load are not clearly defined in que.

Que: If I want to set a power plant in desert of 'Rajasthan' and I have option of
steam and gas power plant. Which plant I should set up?

Ans: Obviously gas because steam power plant work with steam that mean prime requirement is water and that unable to find in desert as our requirement whereas gas power plant consume gas as source and water requirement are too low, only use of water in gas power plant for cooling so gas power plant i prefer.

Que: How turbo charger works?

Ans: Turbo charger is used to compress the air which used generally in engine and when engine exhaust burned gases out it has more speed and temp so by using of its speed the small turbine are run then kinetic(speed) of this turbine are used to drive the compressor so air are compressed by that principle turbo charger work.

Que: A bearing is designated as 6205, what is it's bore diameter?

Ans: Last two digit indicates the bore diameter in that problem last digit is 05, and the dia calculate by multiplying it by means of 5 so bore dia= 05 * 5= 25 mm