iron
lead
aluminium
rubber
✅ The correct answer is option D.
Mechanical Engineering MCQs
When a nut is tightened by placing a washer below it, the bolt will be subjected to
tensile stress
compressive stress
shear stress
none of these
✅ The correct answer is option A.
The volumetric efficiency of the compressor is defined as the ratio of volume of free air delivery per stroke to the swept volume of the piston.
Yes
No
✅ The correct answer is option A.
When the battery is half (50%) charged, the specific gravity of acid in a battery is usually
0.74
1
1.12
1.19
✅ The correct answer is option D.
The forces which do not meet at one point and their lines of action do not lie on the same plane are known as
coplaner concurrent forces
coplaner non-concurrent forces
non-coplaner concurrent forces
none of these
✅ The correct answer is option D.
In a psychrometric chart, specific humidity (moisture content) lines are
vertical and uniformly spaced
horizontal and uniformly spaced
horizontal and non-uniformly spaced
curved lines
✅ The correct answer is option B.
Blow off cock in a boiler is used to
control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required
empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit
increase the temperatu
✅ The correct answer is option B.
The discharge through a wholly drowned orifice is given by (where H1 = Height of water (on the upstream side) above the top of the orifice, H2 = Height of water (on the downstream side) above the bottom of the orifice, and H = Difference between two water levels on either side of the orifice)
Q = Cd x bH1 2gh
Q = Cd x bH2 2gh
Q = Cd x b ( H2 – H1 ) 2gh
Q = Cd x bH 2gh
✅ The correct answer is option C.
The mechanical draught produces more draught than natural draught.
TRUE
FALSE
✅ The correct answer is option A.