[A]. 10° to 15°
[B]. 15° to 20°
[C]. 20° to 25°
[D]. 25° to 30°
✅ The correct answer is option C.
Mechanical Engineering MCQs
If two bodies having masses m1 and m2 (m1>m2) have equal kinetic energies, the momentum of body having mass m1 is __________ the momentum of body having mass m2.
[A]. equal to
[B]. less than
[C]. greater than
null
✅ The correct answer is option C.
When a tube of smaller diameter is dipped in water, the water rises in the tube due to viscosity of water.
[A]. True
[B]. False
null
null
✅ The correct answer is option B.
The expansion of fuel in a four stroke cycle diesel engine
[A]. starts at 15° before top dead centre and ends at 30° after top dead centre
[B]. starts at top dead centre and ends at 30° after top dead centre
[C]. starts at 15° after top dead centre and ends at 30° before bottom dead centre
[D]. may start and end anywhere
✅ The correct answer is option C.
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω1 rad/s in the clockwise direction and the link OB turns with angular velocity ω2 rad/s in the clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)
[A]. ω1.ω2.r
[B]. ( ω1 – ω2)r
[C]. ( ω1 + ω2)r
[D]. ( ω1 – ω2)2r
✅ The correct answer is option B.
The action of steam in a steam turbine is
[A]. static
[B]. dynamic
[C]. static and dynamic
[D]. neither static nor dynamic
✅ The correct answer is option B.
The heat transfer by radiation __________ a medium.
[A]. requires
[B]. does not require
null
null
✅ The correct answer is option B.
The swaying couple is maximum or minimum when the angle of inclination of the crank to the line of stroke (θ) is equal to
[A]. 90° and 180°
[B]. 45° and 225°
[C]. 180° and 270°
[D]. 270° and 360°
✅ The correct answer is option B.
A closed cycle gas turbine gives __________ efficiency as compared to an open cycle gas turbine.
[A]. same
[B]. lower
[C]. higher
null
✅ The correct answer is option C.
The hardness is the property of a material due to which it
[A]. can be drawn into wires
[B]. breaks with little permanent distortion
[C]. can cut another metal
[D]. can be rolled or hammered into thin sheets
✅ The correct answer is option C.