castle nut
jam nut
ring nut
sawn nut
✅ The correct answer is option C.
Mechanical Engineering MCQs
A device used for lifting or lowering objects suspended from a hook at the end of retractable chains or cable is called
hoist
jib crane
portable elevator
chain conveyor
✅ The correct answer is option A.
The deformation per unit length is called
tensile stress
compressive stress
shear stress
strain
✅ The correct answer is option D.
The entropy __________ in an irreversible cyclic process.
remains constant
decreases
increases
✅ The correct answer is option C.
The force which acts along the radius of a circle and directed away from the centre of the circle is called centrifugal force.
Agree
Disagree
✅ The correct answer is option A.
The draught produced by a steam jet issuing from a nozzle placed in the ashpit under the fire grate of the furnace is called
induced steam jet draught
chimney draught
forced steam jet draught
none of these
✅ The correct answer is option C.
Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and Vf = Velocity of flow at inlet)
Q = π.D.Vf
Q = π.b.Vf
Q = π.D.b.Vf
Q = D.b.Vf
✅ The correct answer is option C.
The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, and θ = Angle of inclination of crank to the line of stroke)
m.ω2.r cos θ
c.m.ω2.r sin θ
(1 – c)m.ω2.r(cos θ – sin θ)
m.ω2.r(cos θ – sin θ)
✅ The correct answer is option C.
Silicon when added to copper improves
machinability
hardness
hardness and strength
strength and ductility
✅ The correct answer is option C.
The thermal efficiency of diesel engines on weak mixtures is
unaffected
lower
higher
dependent on other factors
✅ The correct answer is option C.