The pitch of threads on a lock-nut is
A.Fine
B.Very fine
C.Coarse
D.Same as that of nut
E.None of the above
Category: Mechanical Engineering Mcqs
A liquid flowing through a tube is turbulent. In which case will the maximum change in heat transfer coefficient occur?
A.Diameter of the tube is increased 2 times maintaining the velocity of flow constant
B.Diameter of the tube is increased 2 times maintaining the rate of liquid flow constant
C.Diameter of the tube is increased 4 time maintaining the ratio of liquid flow constant
D.Diameter of the tube is increased 4 times maintaining the velocity of flow constant
The fastest cooling rate is achieved when steel is quenched in
A.Brine
B.Air
C.Oil
D.Water
The atmosphere gets heated up mainly by
A.Direct sun-rays
B.Radiation from the earth’s surface
C.Heat of the earth’s interior
D.Radiogenic heat
Dielectric strength of a material is
A.Capacity to take two stresses
B.Magnetic property
C.Capacity to withstand high voltage
D.Capacity to resist flow of current
E.Energy storage capacity
In power station practice ‘spinning reserve’ is
A.Reserve generating capacity that is in operation but in service
B.Reserve generating capacity that is connected to bus and ready to take load
C.Reserve generating capacity that is available for service but not in operation
D.Capacity of the part of plant that remains under maintenance
A flange coupling is
A.Used for non-collinear shafts
B.Used for collinear shafts
C.Flexible
D.Used only on small shafts rotating at slow speeds
E.None of the above
Under force-voltage analogy, velocity is considered as analogous to
A.Resistance
B.Current
C.Magnetic flux
D.Inductance
E.Charge
Accumulation of rust and scale in the engine cooling system will cause
A.Slow warm up
B.Reduced output
C.Low exhaust temperature
D.More noise
E.Overheating
If an air cooled compressor gets over-heated during operation, the probable cause cannot be
A.Intake fliter clogged
B.Insufficient lubricating oil
C.Valve strips broken
D.Leadage in intercooler
E.Direction of rotation wrong
