low frontal area
higher thrust
high pressure rise
none of these
✅ The correct answer is option A.
Mechanical Engineering MCQs
The hardness of a grinding wheel is specified by
Brinell hardness number
Rockwel! hardness number
Vickers pyramid number
letter of alphabet
✅ The correct answer is option D.
The frictional torque transmitted in a flat pivot bearing, considering uniform wear, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)
μ W R
μ W R
μ W R
μ W R
✅ The correct answer is option A.
When the end contractions of the weir are suppressed, then number of end contractions (n) are taken as zero
Agree
Disagree
✅ The correct answer is option A.
If there is a fall in the temperature of a composite body, then a member having greater coefficient of linear expansion will be subjected to compressive stress.
TRUE
FALSE
✅ The correct answer is option B.
Ball bearings are, usually, made from
low carbon steel
high carbon steel
medium carbon steel
chrome steel
✅ The correct answer is option D.
The relation between hydraulic efficiency (ηh), mechanical efficiency (ηm) and overall efficiency (ηo) ) is
ηh = ηo x ηm
ηm = ηo x ηh
ηo = ηh x ηm
none of these
✅ The correct answer is option C.
The type of space lattice found in alpha-iron is
face centred cubic space lattice
body centred cubic space lattice
close packed hexagonal space lattice
none of these
✅ The correct answer is option B.
In absorption vapour systems, the refrigerant widely used is R-12.
Correct
Incorrect
✅ The correct answer is option B.
The property of a material necessary for forgings, in stamping images on coins and in ornamental work, is
elasticity
plasticity
ductility
malleability
✅ The correct answer is option B.