480 Important Theory of Machines MCQ Question and Answer | PDF Free Download
1.In a pantograph, all the pairs are
- ATurning pairs
- BSliding pairs
- CSpherical pairs
- DSelf-closed pairs
2.Frequency of vibrations is usually expressed in
- ANumber of cycles per hour
- BNumber of cycles per minute
- CNumber of cycles per second
- DNone of these
3.In a steam engine, the distance by which the outer edge of the D-slide valve overlaps the steam port is called
- ALead
- BSteam lap
- CExhaust lap
- DNone of these
4.The frequency of damped vibrations with viscous damping is ________ the frequency of undamped vibrations.
- AMore than
- BLess than
- CSame as
- DNone of these
5.A system in dynamic balance implies that
- AThe system is critically damped
- BThere is no critical speed in the system
- CThe system is also statically balanced
- DThere will absolutely no wear of bearings
6.For dynamic balancing of a shaft
- AThe net dynamic force acting on the shaft is equal to zero
- BThe net couple due to the dynamic forces acting on the shaft is equal to zero
- CBoth (A) and (B)
- DNone of the above
7.Cross head and guides form a
- ALower pair
- BHigher pair
- CTurning pair
- DSliding pair
8.A slider crank chain consists of following numbers of turning and sliding pairs
- A1, 3
- B2, 2
- C3, 1
- D4, 0
9.The Scott-Russell mechanism consists of
- ASliding and turning pairs
- BSliding and rotary pairs
- CTurning and rotary pairs
- DSliding pairs only
10.The number of links in pantograph mechanism is equal to
- A2
- B3
- C4
- D5
11.The indicator using Watt mechanism is known as
- AThompson indicator
- BRichard indicator
- CSimplex indicator
- DThomson indicator
12.Hart mechanism has
- AEight links
- BSix links
- CFour links
- DTwelve links
13.The periodic time is given by (where ω = Angular velocity of the particle in rad/s)
- Aω/2π
- B2π/ω
- Cω × 2π
- Dπ/ω
14.The height of a Watt's governor is
- ADirectly proportional to speed
- BDirectly proportional to (speed)²
- CInversely proportional to speed
- DInversely proportional to (speed)²
15.In multi V-belt transmission, if one of the belt is broken, we have to change the
- ABroken belt
- BBroken belt and its adjacent belts
- CAll the belts
- DThere is no need of changing any one as remaining belts can take care of transmission of load
16.A spring controlled governor is found unstable. It can be made stable by
- AIncreasing the spring stiffness
- BDecreasing the spring stiffness
- CIncreasing the ball mass
- DDecreasing the ball mass
17.A governor is said to be stable, if the
- ARadius of rotation of balls increases as the equilibrium speed decreases
- BRadius of rotation of balls decreases as the equilibrium speed decreases
- CRadius of rotation of balls increases as the equilibrium speed increases
- DRadius of rotation of balls decreases as the equilibrium speed increases
18.In a hydrodynamic journal bearing, there is
- AA very thin film of lubricant between the journal and the bearing such that there is contact between the journal and the bearing
- BA thick film of lubricant between the journal and the bearing
- CNo lubricant between the journal and the bearing
- DA forced lubricant between the journal and the bearing
19.The dynamic friction is the friction experienced by a body, when the body
- AIs in motion
- BIs at rest
- CJust begins to slide over the surface of the other body
- DNone of the above