25
50
75
100
✅ The correct answer is option B.
Mechanical Engineering MCQs
A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100° C and leaves at 60° C. A cold fluid enters the heat exchanger at 40° C. The mean temperature difference between the two fluids is
20°C
40°C
60°C
66.7°C
✅ The correct answer is option A.
When the nature of contact between the elements of a pair is such that one element can turn about the other by screw threads, the pair is known as a
screw pair
spherical pair
turning pair
sliding pair
✅ The correct answer is option A.
In __________ operation, the chip thickness is minimum at the beginning of the cut and it reaches to the maximum when the cut terminates.
conventional milling
climb milling
face milling
end milling
✅ The correct answer is option A.
In jet propulsion power unit, the inlet duct of diverging shape is used for converting kinetic energy of air into pressure energy.
TRUE
FALSE
✅ The correct answer is option A.
The total energy possessed by a system of moving bodies
is constant at every instant
varies from point to point
is maximum in the start and minimum at the end
is minimum in the star
✅ The correct answer is option A.
The percentage of phosphorus is phosphor bronze is
0.1
1
11.1
98
✅ The correct answer is option A.
The heating and expanding of a gas is called thermodynamic system.
Yes
No
✅ The correct answer is option B.
When a beam is subjected to bending moment, the stress at any point is __________ the distance of the point from the neutral axis.
equal to
directly proportional to
inversely proportional to
independent of
✅ The correct answer is option B.
A basic hole is one whose
lower deviation is zero
upper deviation is zero
lower and upper deviations are zero
none of these
✅ The correct answer is option A.