Which hoist is generally preferred for repetitive or high speed lifting?
A.Magnetic lifting hoist
B.Electric hoist
C.Hand chain hoist
D.None of the above
Category: Mechanical Engineering Mcqs
A flywheel weighs 400 kg and has a radius of gyration of 30 cm about its axis of rotation. It is mounted on a shaft subjected to a moment of 40 kgm. If the flywheel starts from restits speed after 3 seconds wil be
A.10.9 rad/sec
B.19.0 rad/sec
C.16.35 rad/sec
D.3.33 rad/sec
E.51.2 rad/sec
For punching a hole of 25 mm diameter in a plate 20 mm thick, if the shear stress of plate material is 30 kg/mm2, the force required would be
A.10,000 kg
B.18,850 kg
C.28,850 kg
D.47,123 kg
E.None of the above
Which of the following is the advantage of de transmission?
A.Absence of line inductance and capacitance problems
B.No skin effects
C.For the same working voltage the potential stress on the insulation is less
D.No stability problems
E.All of the above
In vibration analysis ‘Beat’ frequency is
A.The frequency at which vibrations of a system are damped
B.The frequency when a system exceeds the vibrations frequency from the critical value
C.The frequency below which vibrations do not cause appreciable damage to equipment
D.Said to occur when two vibrations of almost equal frequency are present
E.One at which the vibrations of a system act exactly opposite to the other thereby causing damping
A smoky blue exhaust is due to
A.Excessive air
B.Excessive rich mixture
C.Burning of oil in combustion chamber
D.Incorrect valve adjustment
E.Incorrect tappet adjustment
The purpose of sometimes adding exothermic materials to sand is
A.To heat the sand
B.To heat the core
C.To dry the mould
D.To produce directional solidification by the generation of heat
E.To produce chilled surfaces
The phenomenon that causes pressure waves resulting in vibration of structure, rough running and melting of piston is
A.detonation
B.pre-ignition
C.knocking
D.none of the above
Inside and outside diameters of a thin tube are to be measured. Only one of the following tools is to be selected. Which one would you choose?
A.Inside caliper
B.Outside caliper
C.Trammel
D.Odd-leg caliper
E.Vernier caliper
Continuous chips may be formed while machining
A.Brittle materials
B.Hard material
C.Tough material
D.Ductile material
E.Non-ferrous material
