3491. Re-entrant or Borda’s mouthpiece is an __________ mouthpiece.
internal
external
✅ 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.
3492. When the Mach number is between __________ the flow is called super-sonic flow.
1 and 2.5
2.5 and 4
4 and 6
1 and 6
✅ The correct answer is option D.
3493. According to lami’s theorem
the three forces must be equal
the three forces must be at 120° to each other
the three forces must be in equilibrium
if the three forces ac
✅ The correct answer is option D.
3494. The velocity ratio of a first system of pulleys with 4 pulleys is
4
8
16
20
✅ The correct answer is option C.
3495. Which one of the following material will require the largest size of riser for the same size of casting?
Aluminium
Cast iron
Steel
Copper
✅ The correct answer is option C.
3496. In spot welding, the distance between the nearest edge of the plate and centre of weld should be equal to
d
1.5 d
3 d
6 d
✅ The correct answer is option B.
3497. The function of an eccentric is to provide __________ motion to the slide valve.
reciprocating
rotary
✅ The correct answer is option A.
3498. The cavitation in a hydraulic machine is mainly due to
low velocity
high velocity
low pressure
high pressure
✅ The correct answer is option C.
3499. In a turbo jet engine, subsequent to heat addition to compressed air, to get the power output, the working substance is expanded in
exit nozzle, which is a constant volume process
exit nozzle, which is essentially an isentropic process
turbine blades, which is a constant volume process
turbine blades, which
✅ The correct answer is option D.
3500. If a pitot tube is placed with its nose upstream, downstream or sideways, the reading will be the same in every case.
TRUE
FALSE
✅ The correct answer is option B.