voltage
flow of current
contact resistance
all of these
✅ The correct answer is option C.
Mechanical Engineering MCQs
The effect of wire drawing is to decrease the area of indicator diagram and thus work done by the engine is reduced.
Agree
Disagree
✅ The correct answer is option A.
If ω/ωn is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach
0°
90°
180°
360°
✅ The correct answer is option C.
In a reaction turbine, when steam flows through the fixed blades,
pressure increases while velocity decreases
pressure decreases while velocity increases
pressure and velocity both decreases
pressure and velocity both increases
✅ The correct answer is option B.
The stagnation pressure rise in a centrifugal compressor takes place
in the diffuser only
in the impeller only
in the diffuser and impeller
in the inlet guide vanes only
✅ The correct answer is option C.
The cold chisels are made by
drawing
rolling
piercing
forging
✅ The correct answer is option D.
The cross-section of a chisel is usually
rectangular
square
hexagonal
octagonal
✅ The correct answer is option D.
If the level of tension in the belt is too high, it can result in a loss of power or in bending of the rotating shaft or crankshaft.
Correct
Incorrect
✅ The correct answer is option A.
The average cutting speed for turning brass with a high speed steel tool is
15 to 19 m/min
25 to 31 m/min
60 to 90 m/min
90 to 120 m/min
✅ The correct answer is option C.
A Francis turbine is used when the available head of water is
0 to 25 m
25 m to 250 m
above 250 m
none of these
✅ The correct answer is option B.