Mechanical Engineering Archives

5051. 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.

5052. 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

✅ The correct answer is option B.

5053. 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.

5054. 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.

5055. 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.

5056. In automobiles G.V.W. refers to

[A]. gross vehicle width

[B]. gross vehicle weight

[C]. gross vehicle wheel base

[D]. gross vehicle wheel track

✅ The correct answer is option B.

5057. 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 power of the wheel is

[A]. 0.25 kW

[B]. 0.75 kW

[C]. 1.75 kW

[D]. 3.75 kW

✅ The correct answer is option C.

5058. The oil pump is driven by the

[A]. camshaft

[B]. alternator shaft

[C]. crankshaft via drive belt

[D]. crankshaft directly

✅ The correct answer is option D.

5059. For centrifugal pump impeller, the maximum value of the vane exit angle is

[A]. 10° to 15°

[B]. 15° to 20°

[C]. 20° to 25°

[D]. 25° to 30°

✅ The correct answer is option C.

5060. The Parsons’ reaction turbine has

[A]. only moving blades

[B]. only fixed blades

[C]. identical fixed and moving blades

[D]. fixed and moving blades of different shape

✅ The correct answer is option C.