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This set of Theory of Machines Multiple Choice Questions & Answers (MCQs) focuses on Theory Of Machines Set 7
Q1 | In case of higher pairs
- There is contact only at higher point of the two elements while in motion
- There is only line or point contact between the two elements while in motion
- There is only line or point contact between the two elements while in motion
- There is no contact between the two elements
- None of the above
Q2 | When one of the links of a kinematic chain is fixed it is known as
- structure
- mechanism
- machine
- None of the above
- None of the above
Q3 | Tan ? can be greater than
- Rough surfaces
- Polished surfaces
- Highly rough surfaces
- Smooth surfaces
- Tan ? can never be greater than
Q4 | For a vibrating body, if ratio ?/?n is very high, then phase angle would tend to approach
- 0?
- 90?
- 180?
- 270?
- None of the above
Q5 | Dynamically unbalanced masses in rotating machines cause
- Noise
- Friction
- Wear
- Vibrations
- All of the above
Q6 | Which of the following are not standard forms for spur-gears?
- All above
- 14
- 14
- 20? full depth involute system
- 20? stub-tooth involute system
Q7 | A stretched string of a guitar when operated is subjected to
- Free vibrations
- Forced torsional vibrations
- Forced transverse vibrations
- Damped vibrations
- None of the above
Q8 | A vibrometer
- Indicates vibration frequency
- Only indicates second and above harmonics
- Indicates vibration amplitude
- Indicates nature of vibrations
- Indicates wave from vibrations
Q9 | For fluctuating loads, the appropriate bearing would be
- Roller bearing
- Ball bearing
- Bush bearing
- Ball bearing with sleeve
- Needle roller bearing
Q10 | In case of belt drives, the effect of centrifugal tension is
- To reduce the driving power
- To increase the driving power
- Not appreciable on driving power
- Dependent on other factors
- None of the above
Q11 | In case of instantaneous centre of rotation
- Only three rigid links have no linear velocities relative to each other
- Two rigid links rotate instantaneously relative to each other
- One rigid link has no linear velocity
- The two rigid links have no linear velocities relative to each other at the instantaneous centre
- None of the above
Q12 | The pitch circle of a cam is
- The smallest circle drawn to the pitch curve from the centre of rotation of curve
- The smallest circle drawn to the cam profile from the centre of rotation of a radial cam
- The circle fitting in cam profile
- The circle with centre as the centre of cam axis and radius such that it passes through the pitch point
- None of the above
Q13 | The standard pressure angle is generally
- 22
- 10?
- 12
- 14
- 17
Q14 | Frequency of oscillation of a compound pendulum having the same distance between point of suspension and the centre of gravity of mass as a simple pendulum will be
- Less
- Same
- More
- Depends on other parameters
- None of the above
Q15 | Which is the false statement about a governor?
- Isochronism in govrnors is desirable when approximately one constant speeds is desired to be kept for all loads
- A very sensitive governor may not be very stable
- A sensitive governor cannot be isochronous
- Hunting in a governor may occur due to worn out guides of the sleeve
- A stable governor has a fixed position of balls for each speed within the working range
Q16 | The angle of obliquity is kept small in order
- To reduce force of friction
- To minimise axial load
- To minimise power loss in gearing
- To avoid larger throusts
- None of the above
Q17 | If there are L number of links in a mechanism, then the number of possible inversions would be
- (L + 2)
- (L + 3)
- L/2
- L
- (L + 1)
Q18 | A mechanism is an assembly of
- two links
- three links
- only four links
- four or more than four links
- None of the above
Q19 | A gear box in an automobile utilises
- Simple gear train
- Compound gear train
- Epicyclic gear train
- Compound-epicyclic gear train
- None of the above
Q20 | In the coupling rod mechanism of a locomotive each of the four pairs is a
- sliding pair
- Rolling pair
- screw pair
- Turning pair
- All of the above
Q21 | At critical speed
- The shaforuns smoothly
- The shaft runs with noise due to vibrations
- The shaft becomes dynamically unstable with negligible lateral amplitudes
- The shaft becomes dynamically unstable with large lateral amplitudes
- None of the above
Q22 | When sunk key is to be used the key way is
- Provided in shaft only
- 36 Hz
- Provided both in shaft and hub
- Keyway is not provided for a sunk key
- Provided in hub only
Q23 | Kinetic friction is
- That which occurs when there is no motion
- Less than maximum static friction
- Is equal to the static friction
- Is always more than peak static friction
- That occurs on dry surfaces only
Q24 | Coriolis component of acceleration will exist only if
- There are two coincidental points
- Two coincident points have relative angular velocity of sliding
- Two coincidental points have linear relative velocity of sliding accompanied by the rotation about fixed centres
- The two coincidental points must have same centre of rotation
- None of the above
Q25 | In a car, transmission losses will be minimum in
- First gear
- Direct gear
- Second gear
- Sperm
- Third gear