Top 250+ Solved Theory of Machines MCQ Questions Answer
Q. A pantograph is a mechanism with
a. Rolling pairs
b. Higher pairs
c. Turning pairs
d. Lower pairs
e. Spherical pairs
Q. In case of higher pairs
a. There is contact only at higher point of the two elements while in motion
b. There is only line or point contact between the two elements while in motion
c. There is only line or point contact between the two elements while in motion
d. There is no contact between the two elements
e. None of the above
Q. When one of the links of a kinematic chain is fixed it is known as
a. structure
b. mechanism
c. machine
d. None of the above
e. None of the above
Q. Tan ? can be greater than
a. Rough surfaces
b. Polished surfaces
c. Highly rough surfaces
d. Smooth surfaces
e. Tan ? can never be greater than
Q. For a vibrating body, if ratio ?/?n is very high, then phase angle would tend to approach
a. 0?
b. 90?
c. 180?
d. 270?
e. None of the above
Q. Dynamically unbalanced masses in rotating machines cause
a. Noise
b. Friction
c. Wear
d. Vibrations
e. All of the above
Q. Which of the following are not standard forms for spur-gears?
a. All above
b. 14
c. 14
d. 20? full depth involute system
e. 20? stub-tooth involute system
Q. A stretched string of a guitar when operated is subjected to
a. Free vibrations
b. Forced torsional vibrations
c. Forced transverse vibrations
d. Damped vibrations
e. None of the above
Q. A vibrometer
a. Indicates vibration frequency
b. Only indicates second and above harmonics
c. Indicates vibration amplitude
d. Indicates nature of vibrations
e. Indicates wave from vibrations
Q. For fluctuating loads, the appropriate bearing would be
a. Roller bearing
b. Ball bearing
c. Bush bearing
d. Ball bearing with sleeve
e. Needle roller bearing
Q. In case of belt drives, the effect of centrifugal tension is
a. To reduce the driving power
b. To increase the driving power
c. Not appreciable on driving power
d. Dependent on other factors
e. None of the above
Q. In case of instantaneous centre of rotation
a. Only three rigid links have no linear velocities relative to each other
b. Two rigid links rotate instantaneously relative to each other
c. One rigid link has no linear velocity
d. The two rigid links have no linear velocities relative to each other at the instantaneous centre
e. None of the above
Q. The pitch circle of a cam is
a. The smallest circle drawn to the pitch curve from the centre of rotation of curve
b. The smallest circle drawn to the cam profile from the centre of rotation of a radial cam
c. The circle fitting in cam profile
d. The circle with centre as the centre of cam axis and radius such that it passes through the pitch point
e. None of the above
Q. 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
a. Less
b. Same
c. More
d. Depends on other parameters
e. None of the above