Que: What come next from 1,2,3,4,5 options?

Que: What come next from 1,2,3,4,5 options?

a)

b)

c)

Que: In a fusion welding process,

(a) only heat is used 
(b) only pressure is used
(c) combination of heat and pressure is used 
(d) none of these

Ans: (a)

Que: Two shafts will have equal strength, if

(a) diameter of both the shafts is same
(b) angle of twist of both the shafts is same
(c) material of both the shafts is same
(d) twisting moment of both the shafts is same

Ans: (d)

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.