181. A spring controlled governor is found unstable. It can be made stable by
increasing the spring stiffness
decreasing the spring stiffness
increasing the ball mass
decreasing the ball ma
✅ The correct answer is option B.
Theory of machines MCQs
182. The rotating shafts tend to vibrate violently at whirling speeds because
the system is unbalanced
bearing centre line coincides with the axis
the shafts are rotating at very high speeds
resonance is caused du
✅ The correct answer is option D.
183. A link or element need not to be a rigid body, but it must be a resistant body.
Agree
Disagree
✅ The correct answer is option A.
184. A flywheel is used to control the mean speed of an engine caused by the variations in load.
Correct
Incorrect
✅ The correct answer is option B.
185. If the controlling force line for a spring controlled governor when produced intersects the Y-axis above the origin, then the governor is said to be unstable.
Right
Wrong
✅ The correct answer is option A.
186. Critical damping is a function of
mass and stiffness
mass and damping coefficient
mass and natural frequency
damping coefficient an
✅ The correct answer is option A.
187. The method of obtaining different mechanisms by fixing in turn different links in a kinematic chain, is known as
structure
machine
inversion
compound mechanism
✅ The correct answer is option C.
188. The secondary unbalanced force is maximum __________ in one revolution of the crank.
two times
four times
eight times
sixteen times
✅ The correct answer is option B.
189. A rotary internal combustion engine has __________ cylinders.
four
five
six
seven
✅ The correct answer is option D.
190. A kinematic chain is known as a mechanism when
none of the links is fixed
one of the links is fixed
two of the links are fixed
none of these
✅ The correct answer is option B.