4161. Half nut is used to lock the lathe carriage to the lead screw for thread cutting.
TRUE
FALSE
✅ 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.
4162. The hydraulic efficiency of an impulse turbine is the
ratio of the actual power produced by the turbine to the energy actually supplied by the turbine
ratio of the actual work available at the turbine to the energy imparted to the wheel
ratio of the work done on the wheel to the energy of the jet
none of the above
✅ The correct answer is option C.
4163. The alignment circle is marked on the psychrometric chart at
20°C DBT and 50% RH
26°C DBT and 50% RH
20°C DBT and 60% RH
26°C DBT and 60% RH
✅ The correct answer is option B.
4164. When a low carbon steel is heated upto lower critical temperature,
there is no change in grain size
the average grain size is a minimum
the grain size increases very rapidly
the grain size first i
✅ The correct answer is option A.
4165. The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)
d/8
d/6
d/4
d/2
✅ The correct answer is option C.
4166. According to Bazin, the coefficient of discharge varies with the height of water over the sill of a weir.
Correct
Incorrect
✅ The correct answer is option A.
4167. Thermit, used in thermit welding, is a mixture of
charcoal and iron oxide
charcoal and aluminium
iron oxide and aluminium
charcoal, iron oxide a
✅ The correct answer is option C.
4168. A taper tap has
its end tapered for about three or four threads
its end tapered for about eight or ten threads
full threads for the whole of its length
none of the above
✅ The correct answer is option B.
4169. Body centred cubic space lattice is found in
zinc, magnesinm, cobalt, cadmium, antimony and bismuth
gamma-iron, aluminium, copper, lead, silver and nickel
alpha-iron, tungsten, chromium and molybdenum
none of the above
✅ The correct answer is option C.
4170. Performance rating is equal to
observed performance + normal performance
observed performance – normal performance
observed performance x normal performance
none of the above
✅ The correct answer is option D.