four
five
six
seven
✅ The correct answer is option D.
Mechanical Engineering MCQs
As compared to air standard cycle, in actual working, the effect of variation in specific heats is to
increase maximum pressure and maximum temperature
reduce maximum pressure and maximum temperature
increase maximum pressure and decrease maximum temperature
decrease maximum press
✅ The correct answer is option B.
The process of undercooling is generally brought about by
circulating more quantity of cooling water through the condenser
using water colder than the main circulating water
employing a heat exchanger
any one of the above
✅ The correct answer is option D.
Which of the following is not a boiler mounting?
Blow off cock
Feed check valve
Economiser
Fusible plug
✅ The correct answer is option C.
The method of obtaining different mechanisms by fixing in turn different links in a kinematic chain, is known as
structure
machine
inversion
compound mechanism
✅ The correct answer is option C.
The impulse turbine rotor efficiency will have a maximum value of 0.5 cos2 α, where α is the nozzle exit flow angle, if the
blades are equiangular
blade velocity coefficient is unity
blades are equiangular and frictionless
blade solidity is 0.65
✅ The correct answer is option C.
Which of the following process is used for preparing parts having large curved surfaces and thin sections?
Hot machining
Ultra-sonic machining
ECM process
Chemical milling
✅ The correct answer is option D.
In a marine flange coupling, the pitch circle diameter of bolts is taken as
1.2 d
1.6 d
2 d
2.5 d
✅ The correct answer is option B.
The mean effective pressure of a diesel engine having fixed compression ratio will __________ if cut off ratio decreases.
increase
decrease
✅ The correct answer is option B.