WorksheetsDOM Model-3 Part-B
Total questions: 15
Worksheet time: 30mins
Name
Class
Date
1.
In order to find the maximum bending moment on the arms, it is assumed as a
a)
a) simply supported beam carrying a uniformly distributed load over the arm
b)
b) fixed at both ends (i.e. at the hub and at the free end of the rim) and carrying a uniformly distributed load over the arm.
c)
c) cantilever beam fixed at the hub and carrying a concentrated load at the free end of the rim
d)
d) none of the mentioned
2.
If E = Mean kinetic energy of the flywheel, CS = Coefficient of fluctuation of speed and Δ E = Maximum fluctuation of energy, then
a)
a) ΔE = E / CS
b)
b) ΔE = E2 × CS
c)
c) ΔE = E × CS
d)
d) ΔE = 2 E × CS
3.
A machine punching 38 mm holes in 32 mm thick plate requires 7 N-m of energy per sq. mm of sheared area, find the maximum shear force required.
a)
a) 26.7 kN
b)
b) 53.4 kN
c)
c) 13.35 kN
d)
d) 106.8 kN
4.
When the length of the connecting rod is unknown then the value (θ2 –θ1)/2π is equal to ________
a)
a) t/s
b)
b) t/2s
c)
c) t/2r
d)
d) t/r
5.
From the given data, find the balancing mass in Kg if r=0.2m required in the same plane. Masses = 200kg, 300kg, 240 kg, 260Kg, corresponding radii = 0.2m, 0.15m, 0.25m and 0.3m. Angles between consecutive masses = 45, 75 and 135 degrees.
a)
a) 116
b)
b) 58
c)
c) 232
d)
d) 140
6.
When the primary direct crank of a reciprocating engine makes an angle θ with the line of stroke, then the secondary direct crank will make an angle of . . . . . with the line of stroke.
a)
a) θ /2
b)
b) θ
c)
c) 2 θ
d)
d) 4 θ
7.
In under damped vibrating system, if x1 and x2 are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to
a)
a) x1/x2
b)
b) log (x1/x2)
c)
c) loge (x1/x2)
d)
d) log (x1.x2)
8.
In vibration isolation system, if ω/ωn > 1, then the phase difference between the transmitted force and the disturbing force is
a)
a) 0°
b)
b) 90°
c)
c) 180°
d)
d) 270°
9.
While calculating the natural frequency of a spring-mass system, the effect of the mass of the spring is accounted for by adding X times its value to the mass, where X is
a)
a) 1/2
b)
b) 1/3
c)
c) 1/4
d)
d) 3/4
10.
Calculate critical damping coefficient in Ns/m from the following data.mass = 200Kg,ω = 20rad/s
a)
a) 25,132
b)
b) 26,132
c)
c) 27,132
d)
d) Not possible
11.
Calculate damping ratio from the following data:mass = 200Kg,ω = 20rad/s,damping coefficient = 800 N/m/s
a)
a) 0.03
b)
b) 0.04
c)
c) 0.05
d)
d) 0.06
12.
In which of the cases the factor c = 0?
a)
a) When there is damping
b)
b) No damping
c)
c) Resonance
d)
d) c is never 0
13.
The sensitiveness of a governor is given by
a)
a) ωmean/ω2 – ω1
b)
b) ω2 – ω1/ ωmean
c)
c) ω2 – ω1/ 2ωmean
d)
d) none of the mentioned
14.
Find the power of the governor if the Mean effort is 50 N and sleeve lift is 100 mm.
a)
a) 5N-m
b)
b) 25N-m
c)
c) 250N-mm
d)
d) 50N-mm
15.
The flywheel of an engine has a mass of 200 kg and radius of gyration equal to 1 m. The average torque on the flywheel is 1200 Nm. Find the angular acceleration of flywheel and the angular speed after 10 seconds starting from rest.
a)
a) 3 rad/s
b)
b) 4 rad/s
c)
c) 5 rad/s
d)
d) 6 rad/s
100 %
