201. In a reciprocating steam engine, when the crank has turned from inner dead centre through an angle θ, the angular acceleration of the connecting rod is given by
✅ The correct answer is option C.
Theory of machines MCQs
202. When the body is suspended at the point of suspension, its periodic time and frequency will be __________ as compared to the body suspended at the point of percussion.
same
two times
four times
✅ The correct answer is option A.
203. When no external force acts on a body, after giving it an initial displacement, the body is said to have free vibrations.
TRUE
FALSE
✅ The correct answer is option A.
204. The equivalent length of a simple pendulum which gives the same frequency as a compound pendulum is
✅ The correct answer is option B.
205. Which of the following statement is correct for gears ?
The addendum is less than the dedendum
The pitch circle diameter is the product of module and number of teeth
The contact ratio means the number of pairs of teeth in contact
all of the above
✅ The correct answer is option D.
206. Which of the following statement is correct as regard to the difference between a machine and a structure?
The parts of a machine move relative to one another, whereas the members of a structure do not move relative to one another
The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only
A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work
all of the above
✅ The correct answer is option D.
207. The periodic time of one oscillation for a simple pendulum is
✅ The correct answer is option C.
209. The unbalanced force due to revolving masses
varies in magnitude but constant in direction
varies in direction but constant in magnitude
varies in magnitude and direction both
constant in magnitude
✅ The correct answer is option B.
210. Which of the following property of the instantaneous centre is correct ?
A rigid link rotates instantaneously relative to another link at the instantaneous centre for the configuration of the mechanism considered.
The two rigid links have no linear velocity relative to each other at the instantaneous centre.
The velocity of the instantaneous centre relative to any third rigid link is same whether the instantaneous centre is regarded as a point on the first rigid link or on the second rigid link.
all of the above
✅ The correct answer is option D.