Mechanical Engineering is part of Engineering and holds 2,078 questions with answers, free to read and with no account needed.
Attempt each question before revealing the answer, and keep a note of the ones you get wrong — those are the topics worth reading about properly. If an answer looks wrong, there is a link to report it on every question.
Answer: B. forward stroke
Files feature rows of sharp teeth angled in a single direction. Material is sheared away only when the file is pushed forward. Lifting or dragging the file back removes no metal and dulls teeth. Hand files are essential...
Answer: A. method study and work measurement
Work study is fundamentally divided into two complementary primary techniques: method study and work measurement. Method study focuses on simplifying processes and improving operational layouts to eliminate unnecessary w...
Answer: C. alloy of tin, lead and cadmium
White metal bearing alloys are formulated using combinations of low-melting metals like tin, lead, and cadmium. These elements create a soft bearing matrix capable of trapping wear particles during machine operation. Sta...
Answer: C. 3d
To prevent electrical shunting and ensure proper weld nugget formation, minimum spot weld spacing must be maintained. Electrical current tends to bypass adjacent welds if they are placed too close together during resista...
Answer: A. below the recrystallisation temperature
Cold working processes induce plastic deformation in metals at temperatures below recrystallization. This process causes dislocation entanglement and strain hardening, which increases the metal strength. Performing the w...
Answer: C. planishing
Planishing is a metalworking process that smooths and levels distorted sheet metal surfaces. Light hammer blows or specialized rollers eliminate localized buckles and surface imperfections. Cold working during planishing...
Answer: D. Advanced
Higher engine speeds mean pistons travel upward much faster than before. Spark plugs must fire earlier to allow complete combustion before power stroke. This timing adjustment is known as advancing the ignition spark. Co...
Answer: A. carbon, hydrogen, nitrogen, sulphur, moisture
Ultimate fuel analysis measures the exact elemental mass percentages of carbon, hydrogen, nitrogen, sulfur, and oxygen. This comprehensive breakdown accounts for all primary combustible and non-combustible chemical eleme...
Answer: A. Pascal’s law
A dead weight pressure gauge tester applies a known weight over a precision piston area. The fluid beneath the piston transmits this applied force uniformly throughout the internal hydraulic liquid. This transmission of...
Answer: A. remains constant
Theoretical steam expansion within ideal turbines is modeled thermodynamically as a reversible adiabatic process. An adiabatic process with no internal friction or irreversibilities maintains constant entropy throughout...
Answer: D. combination die
A combination die performs multiple operations, including both cutting and non-cutting actions, simultaneously. All these operations take place at a single workstation within the press during one stroke. This design impr...
Answer: B. equal volumes of oxygen and acetylene
Balanced chemical combustion of acetylene requires equal volumetric supplies of oxygen gas. A neutral flame prevents both carburizing and oxidizing effects on the molten weld metal pool. Equal proportions ensure complete...
Answer: D. Taylor plan
The Taylor differential piece rate system penalizes workers failing to meet quotas. It does not guarantee a minimum base time wage like typical bonus plans. Therefore, it is excluded from standard cooperative wage incent...
Answer: C. cementite
White cast iron features carbon combined chemically with iron in the form of iron carbide, known as cementite. This hard cementite phase prevents free graphite precipitation during solidification, giving the fracture sur...
Answer: B. brass
Brass is an alloy of copper and zinc whose crystal structure hinders dislocation movement effectively. This alloy composition causes plastic deformation to induce rapid strain hardening during cold working. Therefore, br...
