

MCQOPTIONS
This section includes 8247 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
8151. |
During sensible cooling of air, its wet bulb temperature |
A. | decreases but dew point remains constant. |
B. | increases but dew point remains constant. |
C. | increases & the dew point decreases. |
D. | decreases & the dew point increases. |
Answer» C. increases & the dew point decreases. | |
8152. |
A material is capable of resisting softening at high temperature, because of its property termed as |
A. | hot temper |
B. | hot hardness |
C. | fatigue |
D. | creep |
Answer» C. fatigue | |
8153. |
Cascade control is |
A. | the continuous adjustment of the set point index of an automatic control loop by a primary (master) controller. |
B. | used when changes in process conditions cause serious upsets in the controlled variable. |
C. | useful to control flow from temperature. |
D. | all 'a', 'b' & 'c'. |
Answer» E. | |
8154. |
Which of the following alloying elements is present in maximum percentage in high speed steel. |
A. | Molybdenum |
B. | Chromium |
C. | Tungsten |
D. | Vanadium |
Answer» B. Chromium | |
8155. |
According to maximum shear stress failure criterion, yielding in material occurs, when the maximum shear stress is equal to __________ times the yield stress. |
A. | 0.5 |
B. | 2 |
C. | <span class="root">2</span> |
D. | <span class="root">3</span> |
E. | /2 |
Answer» B. 2 | |
8156. |
Softening of hardned steel is done by its |
A. | normalising |
B. | tempering |
C. | annealing |
D. | carburising |
Answer» B. tempering | |
8157. |
Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about |
A. | 9:1 |
B. | 17 : 1 |
C. | 23 : 1 |
D. | 29 : 1 |
Answer» C. 23 : 1 | |
8158. |
__________ is a non volatile film forming constituent of a paint. |
A. | Thinner |
B. | Dryer |
C. | Drying oil |
D. | none of these |
Answer» D. none of these | |
8159. |
Transformer cores are normally made from |
A. | soft ferrites |
B. | high purity iron |
C. | grain oriented Fe-Si alloy |
D. | Al-Ni-Co alloy |
Answer» D. Al-Ni-Co alloy | |
8160. |
__________ test is the appropriate test to determine whether a material is ductile or brittle. |
A. | Impact |
B. | Cupping |
C. | Hardness |
D. | Tensile |
Answer» B. Cupping | |
8161. |
Main constituent of bone ash is |
A. | ammonium phosphate. |
B. | calcium phosphate. |
C. | animal charcoal. |
D. | ammonium sulphate. |
Answer» C. animal charcoal. | |
8162. |
Use of water as a manometric liquid suffers from the disadvantage of its |
A. | low vapour pressure. |
B. | corrosive nature. |
C. | high vapour pressure. |
D. | high boiling point. |
Answer» D. high boiling point. | |
8163. |
The following thermocouple may be used for measuring temperature upto 1873 K. |
A. | Chromel-alumel |
B. | Copper-constantan |
C. | Platinum-platinum rhodium |
D. | Iron-constatan |
Answer» D. Iron-constatan | |
8164. |
Closeness of packing is maximum in case of __________ crystal lattice. |
A. | face centred |
B. | simple cubic |
C. | body centred |
D. | none of these |
Answer» B. simple cubic | |
8165. |
Thermodynamic cycle involved in the working of a thermal power plant is the __________ cycle. |
A. | Joule |
B. | Carnot |
C. | Rankine |
D. | Brayton |
Answer» D. Brayton | |
8166. |
The underground well of a biogas plant is called the |
A. | septic tank |
B. | oxidation well |
C. | digestor |
D. | lagoon |
Answer» D. lagoon | |
8167. |
Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog? |
A. | Nitrogen oxides |
B. | Hydrocarbons |
C. | both 'a' & 'b' |
D. | Carbon monoxide |
Answer» D. Carbon monoxide | |
8168. |
Valves in pipe size of 2" and under are normally made of |
A. | wrought iron |
B. | brass |
C. | bronze |
D. | monel |
Answer» C. bronze | |
8169. |
Ceramic materials are |
A. | organic in nature. |
B. | stronger in compression than in tension |
C. | always amorphous in nature. |
D. | always bad heat conductors. |
Answer» C. always amorphous in nature. | |
8170. |
In the Contact process of sulphuric acid manufacture, 98% acid cooler is made of |
A. | stainless steel |
B. | cast iron |
C. | lead lined steel |
D. | rubber lined steel |
Answer» C. lead lined steel | |
8171. |
For platinum thermocouples, lead wires are made of |
A. | copper & copper-nickel alloys. |
B. | copper & iron. |
C. | iron & nickel. |
D. | tin & nickel. |
Answer» B. copper & iron. | |
8172. |
High resistance electrical heating elements/wire are not made of |
A. | marageing steel |
B. | nimonic alloys |
C. | kanthal wire |
D. | nichrome |
Answer» B. nimonic alloys | |
8173. |
Cast irons are generally specified by their |
A. | carbon percentage |
B. | tensile strength |
C. | hardness |
D. | iron percentage |
Answer» C. hardness | |
8174. |
Which is an amorphous material ? |
A. | Glass |
B. | Mica |
C. | Brass |
D. | Cast iron |
Answer» B. Mica | |
8175. |
Which one is remelted and poured into moulds to get cast iron ? |
A. | Wrought iron |
B. | Pig iron |
C. | Low carbon steel |
D. | Mild steel |
Answer» C. Low carbon steel | |
8176. |
Wood metal is not used for making |
A. | soft solder. |
B. | casting for dental work. |
C. | storage tank for storing brine and caustic soda. |
D. | fusible safety plug for pressure cooker. |
Answer» D. fusible safety plug for pressure cooker. | |
8177. |
Babbit metal is not a |
A. | tin base alloy |
B. | white metal |
C. | lead base alloy |
D. | pure metal |
Answer» E. | |
8178. |
Which of the following alloys does not contain nickel ? |
A. | Chloro, et-2 alloy |
B. | Monel |
C. | Inconel |
D. | Babbit metal |
Answer» E. | |
8179. |
Which of the following is the lightest of engineering metals ? |
A. | Magnesium |
B. | Aluminium |
C. | Titanium |
D. | Tin |
Answer» B. Aluminium | |
8180. |
Evaporators used in caustic soda recovery and production plant are made of |
A. | monel metal |
B. | gun metal |
C. | wood metal |
D. | babbit metal |
Answer» B. gun metal | |
8181. |
With increase in carbide/graphite ratio in cast iron, its |
A. | hardness & brittleness increases. |
B. | ductility decreases. |
C. | both (a) and (b). |
D. | neither (a) nor (b). |
Answer» D. neither (a) nor (b). | |
8182. |
Ammonium chloride solution is stored/ treated in __________ vessels/pipes. |
A. | plain carbon steel |
B. | stainless steel |
C. | rubber or durmet-20 lined |
D. | lead |
Answer» D. lead | |
8183. |
Nickel and copper are the basic constituents of |
A. | hastelloy |
B. | monel metal |
C. | German silver |
D. | inconel |
Answer» C. German silver | |
8184. |
Copper has very low |
A. | malleability |
B. | ductility |
C. | tensile strength |
D. | thermal & electrical conductivity |
Answer» D. thermal & electrical conductivity | |
8185. |
Hardest material so far found is |
A. | diamond |
B. | graphite |
C. | carborundum |
D. | pumice stone |
Answer» B. graphite | |
8186. |
The largest consumption of zinc for alloys is in the making of |
A. | bearing metal |
B. | brasses |
C. | brazing solder |
D. | die casting alloys |
Answer» C. brazing solder | |
8187. |
Most suitable material of construction for the storage of concentrated nitric acid is |
A. | cast iron |
B. | monel |
C. | karbate |
D. | aluminium or chromium alloys (Cr > 18% for cold acid) |
Answer» E. | |
8188. |
Mild steel is used for making |
A. | fish plates |
B. | die block |
C. | channels |
D. | drop forging |
Answer» D. drop forging | |
8189. |
Presence of 0.3 to 0.5% arsenic in copper increases its |
A. | ductility |
B. | malleability |
C. | tenacity & hardness |
D. | electrical conductivity |
Answer» D. electrical conductivity | |
8190. |
The heat treatment process applied to cold formed steel parts is |
A. | normalising |
B. | tempering |
C. | artificial ageing |
D. | solution annealing |
Answer» E. | |
8191. |
Plate and frame filter press is usually made of |
A. | mild steel |
B. | cast iron |
C. | stainless steel |
D. | galvanised iron |
Answer» C. stainless steel | |
8192. |
The fermentor used in the production of pencillin (by deep fermentation process) is made of |
A. | glass |
B. | glass lined steel |
C. | high silicon cast iron |
D. | procelain |
Answer» C. high silicon cast iron | |
8193. |
Nickel (76%) and chromium (15%) alloys are termed as |
A. | inconel |
B. | monel |
C. | aluminium bronzes |
D. | brass |
Answer» B. monel | |
8194. |
White metal is an alloy of |
A. | lead, tin and cadmium |
B. | copper, tin and zinc |
C. | copper and lead |
D. | none of these |
Answer» E. | |
8195. |
The carbonating tower used in Solvay process of soda ash manufacture is made of |
A. | cast iron |
B. | stainless steel |
C. | karbate |
D. | lead lined steel |
Answer» B. stainless steel | |
8196. |
The most resistant material to alkaline corrosion is |
A. | duriron |
B. | nickel |
C. | aluminium |
D. | karbate |
Answer» C. aluminium | |
8197. |
Tin coating is not done by |
A. | vaporising |
B. | hot dipping |
C. | electro deposition |
D. | spraying |
Answer» B. hot dipping | |
8198. |
Low carbon steels are those in which carbon percentage is around |
A. | 0.1 to 0.35 |
B. | 0.4 to 0.7 |
C. | 0.8 to 1.5 |
D. | 1.5 to 2 |
Answer» B. 0.4 to 0.7 | |
8199. |
Stainless steel is not corroded by |
A. | hydrochloric acid (10%). |
B. | nitric acid (10%). |
C. | sulphuric acid (10%). |
D. | saturated brine. |
Answer» C. sulphuric acid (10%). | |
8200. |
__________ is added in stainless steel to prevent inter crystal corrosion. |
A. | Vanadium |
B. | Niobium |
C. | Chromium |
D. | Nickel |
Answer» C. Chromium | |