Correct
Incorrect
✅ The correct answer is option A.
Mechanical Engineering MCQs
When a tube of smaller diameter is dipped in water, the water rises in the tube with an upward __________ surface.
concave
convex
✅ The correct answer is option A.
For gas welding, the pressure desired at the welding torch for oxygen is
7 to 103 kN/m2
70 to 280 kN/m2
280 to 560 kN/m2
560 to 840 kN/m2
✅ The correct answer is option B.
A turbo-prop is preferred to turbo-jet because
it has high propulsive efficiency at high speeds
it can fly at super sonic speeds
it can fly at high elevations
it has high power for
✅ The correct answer is option D.
An universal coupling is used to connect two shafts
which are perfectly aligned
which are not in exact alignment
have lateral misalignment
whose axes intersect a
✅ The correct answer is option D.
The operation of making a cone-shaped enlargement of the end of a hole is known as
counter-sinking
counter-boring
trepanning
spot facing
✅ The correct answer is option A.
A taper key which fits half in the key way of the hub and half in the key way of shaft, is known as
sunk key
flat saddle key
hollow saddle key
tangent key
✅ The correct answer is option A.
The driveshafts are connected to the differential and wheel hubs through universal joints because the universal joints
absorb the vibrations transferred from the surface of the road
compensate for variations in the relative positions of the differential and the wheels which result from bumpy road surfaces or other similar driving conditions.
absorb any difference in speed between the left and right wheels when the vehicle is turning
none of the above
✅ The correct answer is option B.
In a Parson’s turbine stage, blade velocity is 320 m/s at the mean radius and rotor blade exit angle is 30°. For minimum kinetic energy of the steam leaving the stage, the steam velocity at the exit of the rotor will be
160/3 m/s
320/3 m/s
640/3 m/s
640 m/s
✅ The correct answer is option C.
The velocity of the liquid flowing through the divergent portion of a venturimeter
remains constant
increases
decreases
depends upon mass of l
✅ The correct answer is option C.