The load cup of a screw jack is made separate from the head of the spindle to

A)
prevent the rotation of load being lifted
B)
enhance the load carrying capacity of the jack
C)
reduce the effort needed for lifting the working load
D)
reduce the value of frictional torque required to be countered for lifting the load

Correct Answer : Option (A) :   prevent the rotation of load being lifted

Recently Updated in Theory of Machines Questions
A rotor which is balanced statically but not dynamically is supported on two bearings L apart and at high speed of the rotor, reaction on the left bearing is R. The right side of the bearing is shifted to a new position 2 L apart from the left bearing. At the same rotor speed, dynamic reaction on the left bearing in the new arrangement will
A)
become equal to 2 R
B)
become equal to R/2
C)
become equal to R/4
D)
remain same as before

Correct Answer :  

The D-slide valve is also known as
A)
piston slide valve
B)
outside admission valve
C)
inside admission valve
D)
None of the above

Correct Answer :   outside admission valve

When the load on the engine increases, it becomes necessary to increase the supply of working fluid and when the load decreases, less working fluid is required. The supply of the working fluid to the engine is controlled by a
A)
governor
B)
flywheel
C)
D-slide valve
D)
Meyer's expansion valve

Correct Answer :   governor

Mechanical Engineering MCQ's

Theory of Machines
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