β/2
30° + β/2
45° + β/2
60° + β/2
✅ The correct answer is option C.
Mechanical Engineering MCQs
A Pelton wheel develops 1750 kW under a head of 100 metres while running at 200 r.p.m. and discharging 2500 litres of water per second. The unit speed of the wheel is
10 r.p.m.
20 r.p.m.
40 r.p.m.
80 r.p.m.
✅ The correct answer is option B.
The pressure velocity compounded impulse turbine allows a bigger pressure drop and hence __________ number of stages are required.
more
less
✅ The correct answer is option B.
The ductility is the property of a material due to which it
can be drawn into wires
breaks with little permanent distortion
can be rolled or hammered into thin sheets
can resist fracture du
✅ The correct answer is option A.
Producer gas is obtained by
partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
carbonisation of bituminous coal
passing steam over incandescent coke
passing air and a larg
✅ The correct answer is option A.
A shoe brake is commonly used in railway trains.
Yes
No
✅ The correct answer is option A.
When a thin cylindrical shell is subjected to an internal pressure, there will be
a decrease in diameter and length of the shell
an increase in diameter and decrease in length of the shell
a decrease in diameter and increase in length of the shell
an increase in diamete
✅ The correct answer is option D.
In an axial flow reaction turbine, the water flows __________ to the axis of the wheel.
parallel
perpendicular
✅ The correct answer is option A.
According to I.B.R., the efficiency of a triple riveted butt joint with double straps of unequal width (5 rivets per pitch length) should be
45 to 60%
63 to 70%
70 to 83%
80 to 90%
✅ The correct answer is option D.
A rotor supported at A and B carries two masses as shown in the below figure. The rotor is
dynamically balanced
statically balanced
statically and dynamically balanced
not balanced
✅ The correct answer is option C.