Theory of Machines MCQ Practice Test - Set 34 - ObjectiveBooks

# Practice Test: Question Set - 34

1. 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.
(A) Same
(B) Two times
(C) Four times
(D) None of these

2. An exact straight line motion mechanism is a
(A) Scott-Russell's mechanism
(B) Hart's mechanism
(C) Peaucellier's mechanism
(D) All of these

3. The equation of free vibrations of a system is (d²x/dt²) +36 π²x, its natural frequency is
(A) 3 Hz
(B) 3π Hz
(C) 6 Hz
(D) 6π Hz

4. The cam follower generally used in automobile engines is
(A) Knife edge follower
(B) Flat faced follower
(C) Spherical faced follower
(D) Roller follower

5. Which gear train is used for higher velocity ratios in a small space?
(A) Simple gear train
(B) Compound gear train
(C) Reverted gear train
(D) Epicyclic gear train

6. Hammer blow
(A) Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.
(B) Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses
(C) Varies as the square root of the speed
(D) Varies inversely with the square of the speed

7. A ball and a socket forms a
(A) Turning pair
(B) Rolling pair
(C) Screw pair
(D) Spherical pair

8. The natural frequency of free longitudinal vibrations is equal to (where m = Mass of the body, s = Stiffness of the body, and δ = Static deflection of the body)
(A) 1/2π × √(s/m)
(B) 1/2π × √(g/δ)
(C) 0.4985/√δ
(D) Any one of these

9. A Hartnell governor is a
(B) Pendulum type governor
(D) Inertia governor

10. The D-slide valve is also known as
(C) Piston slide valve
(D) None of these

11. With usual notations for different parameters involved, the maximum fluctuations of energy for a flywheel is given by
(A) 2ECS
(B) EC S/2
(C) 2ECS²
(D) 2E²CS

12. In Meyer's expansion valve, the main valve is driven by an eccentric having an angle of advance from
(A) 10°-15°
(B) 15°-25°
(C) 25°-30°
(D) 30°-40°

13. Which of the following statement is wrong?
(A) The difference between the maximum and minimum energies is called maximum fluctuation of energy
(B) The coefficient of fluctuation of speed is the ratio of maximum fluctuation of speed to the mean speed
(C) The variations of energy above and below the mean resisting torque line is known as fluctuation of energy
(D) None of the above

14. A body of weight W is required to move up the rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by (where μ = tan φ = Coefficient of friction between the plane and the body)
(A) P = W tan α
(B) P = W tan (α + φ)
(C) P = W (sin α + μ cos α)
(D) P = W (cos α + μ sin α)

15. Which of the following is an open pair?
(A) Journal bearing
(B) Ball and Socket joint
(C) Leave screw and nut
(D) None of the above

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