WorksheetsDynamics of Machine Quiz 08.07.20
Total questions: 6
Worksheet time: 9mins
In the presence of frictional resistance, the expression for piston effort is _________
F(L) – F(I)
F(L) + F(I)
F(L) ± F(I) – R(f)
F(L) – F(I) + R(f)
Crank effort is the product of crank pin radius and _______
Thrust on sides
Crankpin effort
Force acting along connecting rod
Piston effort
In a horizontal engine, the weight of the reciprocating parts also add/subtract to the piston effort.
True
False
For the given data of an Internal combustion engine : Mass of parts = 180 kg bore = 175 mm, length of stroke = 200 mm, engine speed = 500 r.p.m., length of connecting rod = 400 mm and crank angle = 60° from T.D.C, find the inertia force.
17.56 N
19.2 N
18.53 N
18.00 N
The crank-pin circle radius of a horizontal engine is 300 mm. The mass of the reciprocating parts is 250 kg. When the crank has travelled 30° from T.D.C., the difference between the driving and the back pressures is 0.45 N/mm2. The connecting rod length between centres is 1.2 m and the cylinder bore is 0.5 m. If the engine runs at 250 r.p.m. and if the effect of piston rod diameter is neglected, calculate the net load on piston.
88000 N
90560 N
78036 N
88357 N
From the data given:
crank-pin circle radius = 300mm
mass of the reciprocating parts = 250kg
difference between the driving and the back pressures is 0.45 N/mm2
The connecting rod length between centres is 1.2 m and the cylinder bore is 0.5 m.
engine runs at 250 r.p.m & 30° from T.D.C.
Find the piston effort.
32.4 kN
35.2 kN
37.3 kN
40.2 N
