these react with water vapour and cause acid rain
these react with plants and cause green-house effect
these react with oxygen and cause its depletion
these react with ozone
✅ The correct answer is option D.
Mechanical Engineering MCQs
The delta-iron possesses a body centred cubic space lattice.
Correct
Incorrect
✅ The correct answer is option A.
The overall isothermal efficiency of the compressor is defined as the ratio of
work required to compress the air isothermally to the actual work required to compress the air for the same pressure ratio
isothermal power to the shaft power or B.P. of the motor or engine required to drive the compressor
volume of free air delivery per stroke to the swept volume of the piston
isentropic power to th
✅ The correct answer is option B.
Chilled cast iron is produced
by adding magnesium to molten cast iron
by quick cooling of molten cast iron
from white cast iron by annealing process
none of these
✅ The correct answer is option B.
A vessel into which the steam is exhausted and condensed after doing work in an engine cylinder or turbine is known as
steam condenser
steam boiler
steam preheater
economiser
✅ The correct answer is option A.
The ratio of the energy absorbed by the body to the total energy falling on it, is called
absorptive power
emissive power
emissivity
none of these
✅ The correct answer is option A.
When the metal is removed by erosion caused by rapidly recurring spark discharges between the tool and work, the process is known as
electro-chemical machining
electro-discharge machining
ultra-sonic machining
none of these
✅ The correct answer is option B.
The wet bulb temperature at 100% relative humidity is __________ dry bulb temperature.
same as
lower than
higher than
✅ The correct answer is option A.
The order in which effort applied to the steering wheel is transferred to the front wheel is
steering wheel – steering gearbox – steering shaft – tie rod – steering knuckle – front wheels
steering wheel – steering shaft – steering gearbox – tie rod – steering kunckle -front wheels
steering wheel – steering shaft – steering gearbox – steering knuckle – tie rod – front wheels
steering wheel – tie r
✅ The correct answer is option B.
The design of shafts made of brittle materials is based on
Guest’s theory
Rankine’s theory
St Venant’s theory
VonMises theory
✅ The correct answer is option B.