4221. The contact ratio for gears is
zero
less than one
greater than one
infinity
✅ The correct answer is option C.
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.
4222. In a force-closed pair, the two elements of a pair are not held together mechanically.
Agree
Disagree
✅ The correct answer is option B.
4223. The specific cutting energy used for establishing the machinability of the metal depends upon its
coefficient of friction
microstructure
work hardening characteristics
all of these
✅ The correct answer is option D.
4224. The cavitation in reaction turbines is avoided, to a great extent by
installing the turbine below the tail race level
using stainless steel runner of the turbine
providing highly polished blades to the runner
all of the above
✅ The correct answer is option D.
4225. A basic difference between the spark ignition engine and the Diesel engine is that the
Diesel engine compresses air alone instead of an air-fuel mixture
air temperature ignites the fuel in the Diesel engine
fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.C. on the compression stroke
all of the above
✅ The correct answer is option D.
4226. Fire tube boilers are limited to a maximum working pressure of
0.17 MN/m2
1.7 MN/m2
17 MN/m2
170 MN/m2
✅ The correct answer is option B.
4227. If in the equation pvn = C, the value of n = ∝ , then the process is called
constant volume process
adiabatic process
constant pressure process
isothermal process
✅ The correct answer is option A.
4228. Standard time is equal to
normal time minus allowances
normal time plus allowances
representative time multiplied by rating factor
normal time taken by a
✅ The correct answer is option B.
4229. Two speed reverse gear arrangement is generally provided in case of
passenger cars
metadors
tractors
trucks
✅ The correct answer is option C.
4230. For low and moderate speed engines, the cam follower should move with
uniform velocity
simple harmonic motion
uniform accleration and retardation
cycloidal motion
✅ The correct answer is option B.