brown coal
peat
coking bituminous coal
non-coking bituminous
✅ The correct answer is option D.
Mechanical Engineering MCQs
In considering friction of a V-thread, the virtual coefficient of friction (μ1) is given by
μ1 = μ sin β
μ1 = μ cos β
✅ The correct answer is option D.
The coefficient of performance of vapour compression refrigeration system is quite __________ as compared to air refrigeration system.
low
high
✅ The correct answer is option B.
The centre of gravity of a right circular solid cone is at a distance of __________ from its base, measured along the vertical axis.(where h = Height of a right circular solid cone.)
h/2
h/3
h/4
h/6
✅ The correct answer is option C.
In a disc clutch, if there are n1 number of discs on the driving shaft and n2 number of discs on the driven shaft, then the number of pairs of contact surfaces will be
n1 + n2
n1 + n2 + 1
n1 + n2 – 1
n1 + n2 – 2
✅ The correct answer is option C.
Power screws are used to convert rotary motion into translatory motion.
TRUE
FALSE
✅ The correct answer is option A.
The diameter of a cylindrical shell of a Scotch marine boiler varies from
1.5 to 2 m
2.5 to 3.5 m
3.5 to 4.5 m
none of these
✅ The correct answer is option B.
In case of liquids and gases, the heat transfer takes place according to
conduction
convection
radiation
none of these
✅ The correct answer is option B.
Metal patterns require __________ draft allowance than wooden patterns.
more
less
✅ The correct answer is option B.
The recrystallisation temperature of steel is
400° C
600° C
800° C
none of these
✅ The correct answer is option C.