The ratio of the driving tensions for V-belts is __________ times that of flat belts. (where β = Semi-angle of the groove)

A)
sin β
B)
cos β
C)
sec β
D)
cosec β

Correct Answer : Option (D) :   cosec β

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
Engineering Mechanics
Machine Design
Strength of Materials
Engineering Materials
Hydraulic Machines
Thermodynamics
Engineering Drawing
Workshop Technology
Automobile Engineering
Steam Boilers and Engines
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