increases the combustion temperature
creates swirl
maintains a seal and prevents the fuel leakage
maintains a seal and p
✅ The correct answer is option D.
Engineering MCQs
If the evaporator temperature is kept constant, the coefficient of performance of a refrigeration cycle __________ with the increase in condenser temperature.
increases
decreases
✅ The correct answer is option B.
The ratio of velocity of fluid in an undisturbed stream to the velocity of sound wave is known as Mach number.
Yes
No
✅ The correct answer is option A.
Anti-knock for compression ignition engines is
napthene
tetra ethyl lead
amyl nitrate
hexadecane
✅ The correct answer is option C.
The efficiency of a reaction turbine for a given head __________ with the increase in speed.
decreases
increases
✅ The correct answer is option A.
The hydraulic mean depth for a circular pipe of diameter (d) is
d/6
d/4
d/2
d
✅ The correct answer is option B.
In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is Constant, then
open belt drive is recommended
crossed belt drive is recommended
both open belt drive and crossed belt drive is recommended
the drive is recommend
✅ The correct answer is option B.
When carbon in the cast iron is in the form of cementite, the cast iron will be of white colour.
Correct
Incorrect
✅ The correct answer is option A.
Which of the following statement is correct regarding power screws?
The efficiency of a self locking screw can not be more than 50%
The efficiency of Acme (trapezoidal) thread is less than that of a square thread
If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%
(A) and (B) Only
✅ The correct answer is option D.
The production cost per unit can be reduced by
producing more with increased inputs
producing more with the same inputs
eliminating idle time
minimising resource wa
✅ The correct answer is option B.