3 m
6 m
9 m
12 m
✅ The correct answer is option C.
Mechanical Engineering MCQs
The motion of a D-slide valve in a steam engine is simple harmonic.
Yes
No
✅ The correct answer is option A.
A nozzle is said to be a divergent nozzle
when the cross-section of the nozzle increases continuously from entrance to exit
when the cross-section of the nozzle decreases continuously from entrance to exit
when the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
none of the above
✅ The correct answer is option A.
Number of working strokes per min. for a two stroke cycle engine are __________ the speed of the engine in r.p.m.
equal to
one-half
twice
four-times
✅ The correct answer is option A.
The secondary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the lengm of connecting rod to radius of crank)
m.ω2.r sin θ
m.ω2.r cos θ
m.ω2.r
m.ω2.r
✅ The correct answer is option D.
An aluminium alloy with 11% silicon is used for making engine pistons by die casting technique.
Yes
No
✅ The correct answer is option A.
The maximum discharge of steam through a convergent-divergent nozzle depends upon
area of nozzle at throat
initial pressure and volume of steam
final pressure ofsteam leaving the nozzle
both (a) and (b)
✅ The correct answer is option D.
When the effort is in between the fulcrum and load, the lever is said to be of third type.
Correct
Incorrect
✅ The correct answer is option A.
The helix angle of a drill is __________ for drilling brass.
equal to 30°
less than 30°
more than 30°
✅ The correct answer is option B.
When two non-intersecting and non-coplaner shafts are connected by gears, the arrangement is known as
spur gearing
helical gearing
bevel gearing
spiral gearing
✅ The correct answer is option D.