401. When brakes are applied to all the four wheels of a moving car, the distance travelled by the car before it is brought to rest, will be
maximum
minimum
zero
✅ The correct answer is option B.
Theory of machines MCQs
402. In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien’s acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral C Q NO, the acceleration of the piston is zero when the crank OC and connecting rod PC are at right angles to each other.
Correct
Incorrect
✅ The correct answer is option A.
403. The relation l = (j + 2) apply only to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to
one lower pair and two additional links
two lower pairs and one additional link
two lower pairs and two additional links
any one of these
✅ The correct answer is option B.
404. The driving and driven shafts connected by a Hooke’s joint will have equal speeds, if
cos θ = sin α
sin θ = ±tan α
tan θ = ±cos α
cot θ = cos α
✅ The correct answer is option C.
405. The radial distance from the top of a tooth to the bottom of a tooth in a meshing gear, is called
dedendum
addendum
clearance
working depth
✅ The correct answer is option C.
406. Two heavy rotating masses are connected by shafts of lengths l1, l2 and l3 and the corresponding diameters are d1, d2 and d3. This system is reduced to a torsionally equivalent system having uniform diameter d = d1 of the shaft. The equivalent length of the shaft is
l1 + l2 + l3
✅ The correct answer is option C.
407. The equation of motion for a vibrating system with viscous damping is , if the roots of the equation are __________ then the system will be under damped.
equal
real
complex conjugate
✅ The correct answer is option C.
408. A torsional system with discs of moment of inertia I1 and I2 as shown in the below figure, is gear driven such that the ratio of speed of shaft B to shaft A is ‘G’. Neglecting the inertia of gears, the equivalent inertia of disc on shaft B at the speed of shaft A is equal to
G.I2
G2.I2
I2/G
I2/G2
✅ The correct answer is option B.
409. The instantaneous centres, which moves as the mechanism moves but joints are of permanent nature, are called permanent instantaneous centres.
Yes
No
✅ The correct answer is option A.
410. The frictional torque transmitted in a flat pivot bearing, considering uniform pressure, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)
μ W R
μ W R
μ W R
μ W R
✅ The correct answer is option B.