Engineering holds 17,269 questions with answers, free to read and with no account needed. They are grouped into 4 categories: Chemical Engineering, Civil Engineering, Electrical Engineering, Mechanical Engineering.
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. increase
As vehicle speed increases, the volume of exhaust gases passing through the exhaust system rises significantly. This higher volumetric flow rate creates greater flow restriction and frictional resistance within mufflers...
Answer: A. drooping characteristic
A radiant superheater absorbs heat primarily through thermal radiation from the high temperature furnace fire. As steam load increases, firing rate rises, but radiant heat transfer does not increase proportionally. Conse...
Answer: B. titanium alloys
Titanium alloys exhibit exceptional mechanical strength relative to their relatively low material density. Specific strength measures the ratio of tensile strength to material weight density. High specific strength makes...
Answer: A. Inside caliper
Inside calipers are manual measuring tools used for checking internal dimensions. Machinists use them to gauge gap widths during preliminary mechanical setups. Measurements are then transferred to a precision rule for re...
Answer: A. non-coking bituminous coal
Non-coking bituminous coal serves as a primary industrial fuel widely utilized across various combustion applications. Its stable burning characteristics and moderate volatile content make it suitable for continuous furn...
Answer: D. wrought iron
Wrought iron contains microscopic slag inclusions that create internal galvanic corrosion cells when exposed. It lacks the protective alloying elements found in brass, copper, or modern corrosion-resistant stainless stee...
Answer: D. micro-manometer with water
A micro-manometer using water provides exceptional sensitivity for measuring very small pressure differentials accurately. The low density difference between water and air combined with mechanical amplification scales yi...
Answer: E. forced circulation type
Forced circulation boilers use mechanical pumps to maintain positive and rapid water flow through tubes. This forced circulation increases heat transfer rates and allows the boiler to adapt quickly to load changes. Natur...
Answer: E. all of the above
Venturimeters, orifice plates, nozzles, and pitot tubes all apply pressure differences from fluid velocity. Bernoulli equation relates fluid velocity head to static pressure changes along a streamlined flow path. Measuri...
Answer: D. babbit metal
Babbitt metal features a low melting point and excellent anti friction properties. It embeds small foreign particles, protecting rotating shafts from heavy wear. These characteristics make it the ideal material for indus...
Answer: E. none of the above
Steam generators in power plants primarily burn bituminous coals because of their high calorific value and availability. Since specific bituminous coal types vary by region and boiler design, broad categorical answers of...
Answer: A. cobalt
Cemented carbides require a tough metallic matrix to hold brittle carbide particles securely together. Cobalt serves as the standard binder material because it wets tungsten carbide grains exceptionally well. This metall...
Answer: B. C.I. engine
Compression ignition engines operate with unthrottled air intake and inject fuel directly into compressed air chambers. This operating principle allows diesel engines to run successfully on very lean overall air-fuel mix...
Answer: E. pitot tube
A pitot tube measures fluid stagnation pressure and static pressure to determine local flow velocity. Submerged submarines move through water, so a pitot sensor measures relative water speed accurately. Bernoulli princip...
Answer: D. Orsat
The Orsat apparatus is a chemical gas analyzer used to determine volumetric flue gas composition. Measuring combustion gases involves volumetric absorption rather than fluid dynamic viscosity testing. Viscosity meters me...
