301. Coefficient of discharge Cd is equal to (where Cc = Coefficient of contraction, Cv = Coefficient of velocity, and Cr = Coefficient of resistance)
Cc x Cv
Cc x Cr
Cv x Cr
Cc/Cr
✅ The correct answer is option A.
Mechanical Engineering
Prepare with the best Mechanical Engineering MCQs with answers and explanations for exams, interviews, and job tests. Our collection covers core topics such as engineering mechanics, thermodynamics, strength of materials, theory of machines, fluid mechanics, heat transfer, manufacturing processes, machine design, and power plant engineering. These Mechanical Engineering multiple-choice questions are designed for students, fresh graduates, and professionals preparing for NTS, PPSC, FPSC, PEC exams, GATE, university entry tests, and recruitment assessments. Strengthen your technical knowledge and problem-solving ability with our updated and comprehensive Mechanical Engineering MCQs.
302. De-Laval turbines are mostly used
where low speeds are required
for small power purposes and low speeds
for large power purposes
for small power purpos
✅ The correct answer is option D.
303. In a vapour compression refrigeration system, a throttle valve is used in place of an expander because
it considerably reduces mass of the system
it improves the C.O.P., as the condenser is small
the positive work in isentropic expansion of liquid is very small
it leads to significan
✅ The correct answer is option C.
304. The secondary unbalanced force is __________ the primary unbalanced force.
one-half
two-third
n times
1/n times
✅ The correct answer is option D.
305. The example of completely constrained motion is a
motion of a piston in the cylinder of a steam engine
motion of a square bar in a square hole
motion of a shaft with collars at each end in a circular hole
all of the above
✅ The correct answer is option D.
307. Spark plugs in automobiles generally have a gap between
0.3 to 0.7 mm
0.2 to 0.8 mm
0.4 to 0.9 mm
0.6 to 1.8 mm
✅ The correct answer is option D.
308. Which of the following is a proper sequence?
proportional limit, elastic limit, yielding, failure
elastic limit, proportional limit, yielding, failure
yielding, proportional limit, elastic limit, failure
none of the above
✅ The correct answer is option A.
309. The potential energy stored by a spring in compression, is called strain energy.
Yes
No
✅ The correct answer is option A.
310. The discharge through a channel of trapezoidal section is maximum when
width of channel at the top is equal to twice the width at the bottom
depth of channel is equal to the width at the bottom
the sloping side is equal to half the width at the top
the sloping side is eq
✅ The correct answer is option C.