Top 350+ Solved Applied Mechanics MCQ Questions Answer
Q. An electric motor drives a windless which hauls up a crate A of weight W = 500 kg up an inclined plane through a height of 10 m in 2 minutes. The torque acting on the windless is 25 kgm and the drum of the windless makes 30 rpm. The efficiency of the inclined plane would be
a. 41%
b. 61%
c. 26.50%
d. 53.05%
e. 66%
Q. A screw jack has 4 threads per inch. The mean radius of the thread is 2.338 inches. The mean diameter of the bearing surface under the cap is 3.25 inches. What is the turning moment required to raise the bload of 150 kg (
a. 5.61 kg-inch
b. 50.6 kg-inch
c. 107 dynes
d. 30.3 kg-inch
e. 23.6 kg-inch
Q. The law of conservation of mechanical energy is valid
a. Irrespective of the nature of force field
b. Only in gravitational field
c. Only if the total work done by the particle in moving around in a closed trajectory is zero
d. Only if the force is tangential to the trajectory
e. None of the above
Q. In above case the maximum height attained by the ball would be
a. 49 cm
b. 490 cm
c. 980 cm
d. 1960 cm
e. 100 cm
Q. In actual machines
a. Mechanical advantage is unity
b. Mechanical advantage is greater than velocity ratio
c. Mechanical advantage is less than velocity ratio
d. Mechanical advantage is less than unity
e. Mechanical advantage is equal to velocity ratio
Q. The polar moment of inertia of a hollow circular section whose external diameter is 8 cm and internal diameter of 6 cm will be
a. 137.5 cm4
b. 107 dynes
c. 275 cm4
d. 550 cm4
e. 1100 cm4
Q. Which of the following is not a unit of energy?
a. Joule
b. kW
c. N-m
d. Electron volt
e. Watt-hour
Q. If a gymnast sitting on a rotating stool, with his arms outstretched suddenly lowers his arm
a. the angular velocity will remain constant
b. the angular momentum will increase
c. the angular velocity will decrease
d. his moment of inertia will decrease
e. 107 dynes
Q. The y-coordinate of the centroid of the area bounded by the x-axis, the line x = 3 and the parabola y = x2 will be
a. 2.7
b. 2.55
c. 107 dynes
d. 2.6
e. 2.65
Q. Work done by a body of mass 100 kg moving along a circular path of radius 2 m with a uniform velocity of 10 m/sec is
a. 5000 J
b. 2500 J
c. 509.68 J
d. None of the above
e. Tapered bearing
Q. The moment of a force is
a. Equivalent to the algebraic sum of the moments acting on a body
b. Equivalent to the sum of horizontal as well as vertical components of the moments on a body
c. Equivalent to the sum of the moments acting on a body
d. Equivalent to the sum of horizontal components of the moments on a body
e. Equivalent to the vertical sum of the moments acting on a body
Q. Which of the following statement is false?
a. The potential energy of a particle has the form Ep = k2x. The force acting on the particle is constant (k is a constant)
b. The linear velocity of bodies near the earth's equator (due to rotation of earth) is more than the velocities of particles at the pole
c. 107 dynes
d. A cyclist should move along a zig-zag path while ascending a steep hill
e. The density of milk decreases when cream is taken out of milk