2401. A feather key is generally
loose in shaft and tight in hub
tight in shaft and loose in hub
tight in both shaft and hub
loose in both shaft an
✅ The correct answer is option B.
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.
2402. The thermal efficiency of an ideal gas turbine plant is given by (where r = Pressure ratio)
rγ – 1
1 – rγ – 1
✅ The correct answer is option D.
2403. In a steam engine, the earlier cut-off with a simple slide valve may be obtained by increasing the angle of advance of the eccentric but reducing the throw of the eccentric and keeping the steam lap and exhaust lap constant. This method will cause withdrawing or throttling of steam.
Agree
Disagree
✅ The correct answer is option A.
2404. A reactor capable of converting a fertile material into fissile isotopes is called regenerative reactor.
Yes
No
✅ The correct answer is option A.
2405. A simply supported beam is one which is supported on more than two supports.
TRUE
FALSE
✅ The correct answer is option B.
2406. 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.
2407. In natural uranium, the constituents of three naturally occuring isotopes are
U234 = 0.006%, U235 = 0.712% and U238 = 99.282%
U234 = 0.712%, U235 = 0.006% and U238 = 99.282%
U234 = 99.282%, U235 = 0.006% and U238 = 0.712%
U234 = 0.006%, U235 =
✅ The correct answer is option A.
2408. A thin cylindrical shell of diameter (d), length (l) and thickness (t)is subjected to an internal pressure (p). The hoop stress in the shell is
pd/t
pd/2t
pd/4t
pd/6t
✅ The correct answer is option B.
2409. Under logarithmic decrement, the amplitude of successive vibrations are
constant
in arithmetic progression
in geometric progression
in logarithmic progres
✅ The correct answer is option C.
2410. The rise, in water level, which occurs during the transformation of the unstable shooting flow to the stable streaming flow is called hydraulic jump.
Yes
No
✅ The correct answer is option A.