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Theory of machines MCQs

241. The relation between me number of links (l) and the number of binary joints (j) for a kinematic chain having constrained motion is given by l = l – 2. If the left hand side of this equation is greater than the right hand side, then the chain is

locked chain

completely constrained chain

successfully constrained chain

incompletely constrain

✅ The correct answer is option A.

242. A mechanism consisting of four links is called a __________ mechanism.

simple

compound

✅ The correct answer is option A.

243. A mechanism consisting of more than four links is called a compound mechanism.

TRUE

FALSE

✅ The correct answer is option A.

244. In forced vibrations, the magnitude of damping force at resonance is equal to the impressed force.

Correct

Incorrect

✅ The correct answer is option A.

245. The maximum and minimum value of the tractive force is given by

± c.m x ω2.r

± 2 x c.m.ω2.r

± 2(1 – c)m x ω2.r

± 2 x c.m x ω2.r

✅ The correct answer is option C.

246. A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when

a is + ve and b = 0

a = 0 and b is + ve

a is + ve and b is – ve

a is + ve and b is als

✅ The correct answer is option A.

247. A rotor which is balanced statically but not dynamically is supported on two bearings L apart and at high speed of the rotor, reaction on the left bearing is R. The right side of the bearing is shifted to a new position 2 L apart from the left bearing. At the same rotor speed, dynamic reaction on the left bearing in the new arrangement will

remain same as before

become equal to 2 R

become equal to R/2

become equal to R/4

✅ The correct answer is option A.

248. A very sensitive governor will cause hunting.

TRUE

FALSE

✅ The correct answer is option A.

249. The secondary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the lengm of connecting rod to radius of crank)

m.ω2.r sin θ

m.ω2.r cos θ

m.ω2.r

m.ω2.r

✅ The correct answer is option D.

250. The minimum periodic time of a compound pendulum is

✅ The correct answer is option D.

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