MCQOPTIONS
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MCQOPTIONS
This section includes 287 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 251. |
2m, 0.15m, 0.25m and 0.3m. Angles between consecutive masses = 45, 75 and 135 degrees. |
| A. | 116 |
| B. | 58 |
| C. | 232 |
| D. | 140 |
| Answer» B. 58 | |
| 252. |
3m, l=1m, find l2 = 0.5m, find r1 in m. |
| A. | 1.5 |
| B. | 0.75 |
| C. | 3 |
| D. | 6 |
| Answer» C. 3 | |
| 253. |
1m. One of the balancing mass is 30 Kg with RoR of 10cm. |
| A. | 70 |
| B. | 35 |
| C. | 20 |
| D. | 10 |
| Answer» C. 20 | |
| 254. |
2m and r=0.3m, l=1m, find l2. |
| A. | 0.26m |
| B. | 0.52m |
| C. | 1.04m |
| D. | 0.13m |
| Answer» B. 0.52m | |
| 255. |
1m then find the other balancing mass situated at a distance of 0.2m. |
| A. | 80 |
| B. | 40 |
| C. | 20 |
| D. | 10 |
| Answer» E. | |
| 256. |
The starting torque of the steam engine is 1500 N-m and may be assumed constant, using this data find the angular acceleration of the flywheel in rad/s2. |
| A. | 0.4 |
| B. | 0.6 |
| C. | 0.3 |
| D. | 1.2 |
| Answer» C. 0.3 | |
| 257. |
66. |
| A. | 4/3 |
| B. | 3/2 |
| C. | 3/4 |
| D. | 1 |
| Answer» C. 3/4 | |
| 258. |
24 m, length of stroke = 0.6 m, length of connecting rod = 1.5 m, mass of reciprocating parts = 300 kg, mass of connecting rod = 250 kg; speed of rotation = 125 r.p.m ; centre of gravity of connecting rod from crank pin = 0.5 m ; Kg of the connecting rod about an axis through the centre of gravity = 0.65 m |
| A. | 52.7 |
| B. | 49.5 |
| C. | 59.5 |
| D. | 56.5 |
| Answer» D. 56.5 | |
| 259. |
24 m, length of stroke = 0.6 m, length of connecting rod = 1.5 m, mass of reciprocating parts = 300 kg, mass of connecting rod = 250 kg; speed of rotation = 125 r.p.m; centre of gravity of connecting rod from crank pin = 0.5 m ; Kg of the connecting rod about an axis through the centre of gravity = 0.65 m |
| A. | 1.35 m |
| B. | 1.42 m |
| C. | 1.48 m |
| D. | 1.50 m |
| Answer» C. 1.48 m | |
| 260. |
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. | 3 rad/s |
| B. | 4 rad/s |
| C. | 5 rad/s |
| D. | 6 rad/s |
| Answer» E. | |
| 261. |
It is required to lift water at the top of a high building at the rate of 50 litres/min. Assuming the losses due to friction equivalent to 5 m and those due to leakage equal to 5 m head of water, efficiency of pump 90%, decide the kilowatt capacity of motor required to drive the pump. |
| A. | 0.102 kw |
| B. | 0.202 kw |
| C. | 0.302 kw |
| D. | 0.402 kw |
| Answer» D. 0.402 kw | |
| 262. |
The engine of an aeroplane rotates in clockwise direction when seen from the tail end and the aeroplane takes a turn to the right. The effect of gyroscopic couple on the aeroplane will be to dip the nose and raise the tail. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 263. |
The axis of precession is                          to the plane in which the axis of spin is going to rotate. |
| A. | parallel |
| B. | perpendicular |
| C. | spiral |
| D. | none of the mentioned |
| Answer» C. spiral | |
| 264. |
The ratio of height of Porter governor to the height of Watt’s governor is |
| A. | m/m + m |
| B. | m/ m + m |
| C. | m + m/m |
| D. | m + m/m |
| Answer» D. m + m/m | |
| 265. |
When the sleeve of a porter governor moves upwards, the governor speed |
| A. | increases |
| B. | decreases |
| C. | remains unaffected |
| D. | first increases and then decreases |
| Answer» B. decreases | |
| 266. |
Which of the following is correct regarding isolation factor? |
| A. | dimensionless quantity |
| B. | has newton as its unit |
| C. | has joule as its unit |
| D. | has hz as its unit |
| Answer» B. has newton as its unit | |
| 267. |
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. | x1/x2 |
| B. | log (x1/x2) |
| C. | loge (x1/x2) |
| D. | log (x1.x2) |
| Answer» C. loge (x1/x2) | |
| 268. |
The natural frequency (in Hz) of free longitudinal vibrations is equal to |
| A. | 1/2π√s/m |
| B. | 1/2π√g/δ |
| C. | 0.4985/Î |
| D. | all of the mentioned |
| Answer» E. | |
| 269. |
For an under damped harmonic oscillator, resonance |
| A. | occurs when excitation frequency is greater than undamped natural frequency |
| B. | occurs when excitation frequency is less than undamped natural frequency |
| C. | occurs when excitation frequency is equal to undamped natural frequency |
| D. | never occurs |
| Answer» D. never occurs | |
| 270. |
If the crank and the connecting rod are 300 mm and 1 m long respectively and the crank rotates at a constant speed of 250 r.p.m., determine the crank angle at which the maximum velocity occurs is |
| A. | 45 |
| B. | 75 |
| C. | 90 |
| D. | 60 |
| Answer» C. 90 | |
| 271. |
A vehicle suspension system consists of a spring and a damper. The stiffness of the spring is 3.6 kN/m and the damping constant of the damper is 400 Ns/m. If the mass is 50 kg, then the damping factor (d ) and damped natural frequency (fn), respectively, are |
| A. | 0.471 and 1.19 hz |
| B. | 0.471 and 7.48 hz |
| C. | 0.666 and 1.35 hz |
| D. | 0.666 and 8.50 hz |
| Answer» B. 0.471 and 7.48 hz | |
| 272. |
When there is a reduction in amplitude over every cycle of vibration, then the body is said to have |
| A. | free vibration |
| B. | forced vibration |
| C. | damped vibration |
| D. | under damped vibration |
| Answer» D. under damped vibration | |
| 273. |
Balancing of reciprocating masses is the process of providing the second mass in order to counteract the effect of the centrifugal force of the first mass. |
| A. | true |
| B. | false |
| Answer» C. | |
| 274. |
What is the effect of a rotating mass of a shaft on a system? |
| A. | bend the shaft |
| B. | twist the shaft |
| C. | extend the shaft |
| D. | compress the shaft |
| Answer» B. twist the shaft | |
| 275. |
In the given turning moment diagram, the process X is known as |
| A. | suction |
| B. | compression |
| C. | power |
| D. | exhaust |
| Answer» D. exhaust | |
| 276. |
While drawing the turning moment diagram, which of the forces in not taken into account? |
| A. | inertia force |
| B. | force on connecting rod |
| C. | force on crank |
| D. | coriolis force |
| Answer» E. | |
| 277. |
When the work is by on the gases, which of the following effect is observed on the turning moment diagram? |
| A. | formation of negative loop |
| B. | formation of positive loop |
| C. | formation of an infinite loop |
| D. | formation of no loop |
| Answer» C. formation of an infinite loop | |
| 278. |
A negative loop is formed in the turning moment diagram because the pressure inside the cylinder is                than the atmospheric pressure. |
| A. | equal |
| B. | more |
| C. | less |
| D. | no pressure inside |
| Answer» D. no pressure inside | |
| 279. |
Which of the following process is not the part of working of a 4 stroke I.C Engine? |
| A. | compression |
| B. | suction |
| C. | exhaust |
| D. | turbine flow |
| Answer» E. | |
| 280. |
4-stroke engine has one power stroke per 2 revolutions hence turning moment diagram is uniform. |
| A. | true |
| B. | false |
| Answer» C. | |
| 281. |
In case of partial balancing of locomotives, the maximum magnitude of the unbalanced force perpendicular to the line of stroke is called hammer blow and this has to be limited by proper choice of the balancing mass and its radial position. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 282. |
The linear velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by |
| A. | ω(r1-r2)sinθ |
| B. | ω(r1-r2)cosθ |
| C. | ωr1+r2)sinθsec2θ |
| D. | ω(r1+r2)cosθcosec2θ |
| Answer» D. ω(r1+r2)cosθcosec2θ | |
| 283. |
A circle drawn with centre as the cam centre and radius equal to the distance between the cam centre and the point on the pitch curve at which the pressure angle is maximum, is called |
| A. | base circle |
| B. | pitch circle |
| C. | prime circle |
| D. | none of the mentioned |
| Answer» C. prime circle | |
| 284. |
For a 4 cylinder engine, if the minimum speed of the engine is half the maximum speed, then coefficient of fluctuation is |
| A. | 0.5 |
| B. | 1.5 |
| C. | 2 |
| D. | 0.66 |
| Answer» E. | |
| 285. |
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. |
| A. | 32.4 kn |
| B. | 35.2 kn |
| C. | 37.3 kn d) 40.2 n |
| Answer» D. | |
| 286. |
The net force acting on the crosshead pin is known as |
| A. | crank pin effort |
| B. | crank effort |
| C. | piston effort |
| D. | shaft effort |
| Answer» D. shaft effort | |
| 287. |
Why the inertia torque acts in the opposite direction to the accelerating couple? |
| A. | bring the body in equilibrium |
| B. | to reduce the accelerating torque |
| C. | acts as a constraint torque |
| D. | increase the linear acceleration |
| Answer» B. to reduce the accelerating torque | |