Top 250+ Solved Theory of Machines MCQ Questions Answer
Q. In case of reciprocating engines the primary forces
a. Are fully balanced
b. Remain unbalanced
c. Are partially balanced
d. Cannot be balanced
e. None of the above
Q. Which one of the following is a transmission type dynamometer?
a. Prony brake
b. Rope brake
c. Hydraulic dynamometer
d. Electric generator types
e. None of the above
Q. In case of gears the addendum is given by
a. 1.57 x module
b. 1.25 x module
c. ?/circular pitch
d. 2.157/module
e. One module
Q. The rectilinear motion of a piston is converted into rotary motion by
a. Cross-head
b. Piston pin
c. Connecting rod
d. Crank
e. Piston rod
Q. In case of gears the pressure angle is
a. The angle between the line of action and the common tangent to the pitch surface in the plane of rotation
b. The angle between the normal to the point of contact and the shaft axis
c. The angle between the normal to dedendum at the path point and tangent to the dedendum at the path point and tangent to the dedendum at the same point
d. The angle of obliquity between the tangent drawn at the point of contact of the two mating gears
e. None of the above
Q. A swinging pendulum in its mid-position possesses
a. only the potential energy
b. only the kinetic energy
c. more kinetic energy and less potential energy
d. None of the above
e. None of the above
Q. When the two elements of a pair are kept in contact with the help of a spring, the pair is known as
a. A lower pair
b. a higher pair
c. a closed pair
d. an unclosed pair
e. None of the above
Q. Which one of the following is a higher pair?
a. Tooth gearing mechanism
b. Thomoson indicator mechanism
c. Crossby indicator mechanism
d. Double McInnes Indicator mechanism
e. Hart's straight line mechanism
Q. The difference between a machine and a structure is
a. The machine serves to modify and transmit forces only whereas structures serve to modify and transmit mechanical work
b. The machine serves to modify and transmit mechanical work whereas structures serve to modify and transmit forces only
c. The relative motion exists between the parts of a structures whereas it does not exist in machines
d. Structures are temporary constructions whereas machines are paramanent
e. None of the above
Q. In case of lower pairs
a. There is surface contact between the two elements while in the motion
b. There is line contact between the two elements while in the motion
c. There is point contact between the two elements while is motion
d. The contact is only at lower end of the two elements while in motion
e. None of the above
Q. A 0.5 kg weight attached to a light spring elongates it 0.6 mm. The natural frequency of the system should be approximately
a. 6 Hz
b. 26 Hz
c. 36 Hz
d. 32 Hz
e. 16 Hz
Q. A piston and cylinder in a slider crank mechanism form a
a. Sliding pair
b. Rolling pair
c. Cylindrical pair
d. Sliding pair
e. Turning pair
Q. In case of reciprocating engine mechanism
a. The primary and secondary forces have same direction
b. The primary and secondary forces have same amplitude
c. The ratio of magnitude of primary forces of secondary forces is 2
d. The primary force has twoce the frequency of secondary force
e. None of the above
Q. At node of the shaft
a. The vibrations are inimum
b. The vibrations are maximum
c. The vibrations are average
d. The vibrations are zero
e. None of the above
Q. In a well greased ball bearing the coefficient of friction may be in the range
a. 0.45 to 0.60
b. 0.25 to 0.45
c. 0.60 to 0.70
d. 0.70 to 0.80
e. 0.1 to 0.25