131. A machine having an efficiency greater than 50%, is known as
reversible machine
non-reversible machine
neither reversible nor non-reversible machine
ideal machine
✅ The correct answer is option A.
Engineering Mechanics MCQs
132. The velocity of a particle moving with simple harmonic motion is __________ at the mean position.
zero
minimum
maximum
✅ The correct answer is option C.
133. The time of flight (t) of a projectile on a horizontal plane is given by
✅ The correct answer is option A.
134. If a body is acted upon by a number of coplaner non-concurrent forces, it may
rotate about itself without moving
move in any one direction rotating about itself
be completely at rest
all of these
✅ The correct answer is option D.
135. A newton is defined as the force while acting upon a mass of one kg, produces an acceleration of 1 m / s2 in the direction of which it acts.
Yes
No
✅ The correct answer is option A.
136. Two equal and opposite parallel forces whose lines of action are different, can be replaced by a single force parallel to the given forces.
Correct
Incorrect
✅ The correct answer is option B.
137. The centre of gravity of an is osceles triangle with base (p) and sides (q) from its base is
✅ The correct answer is option A.
138. A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is
reversible
non-reversible
ideal
✅ The correct answer is option A.
139. The centre of gravity of a right circular solid cone is at a distance of __________ from its base, measured along the vertical axis.(where h = Height of a right circular solid cone.)
h/2
h/3
h/4
h/6
✅ The correct answer is option C.
140. The unit of mass moment of inertia in S.I. units is kg-m2.
TRUE
FALSE
✅ The correct answer is option A.