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MCQOPTIONS
This section includes 2253 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1051. |
For a thermodynamic system undergoing a process, which of the following pairs best expresses the relationship similar to that expressed by the pressure volume plot ? |
| A. | Temperature - entropy. |
| B. | Temperature - pressure. |
| C. | Enthalpy - entropy. |
| D. | Enthalpy-pressure. |
| Answer» B. Temperature - pressure. | |
| 1052. |
Change in volume of metals from absolute zero temperature to their melting points is |
| A. | almost same for all metals. |
| B. | different for different metals. |
| C. | less for low melting point metals. |
| D. | less for high melting point metals. |
| Answer» B. different for different metals. | |
| 1053. |
The weight of a body at the centre of the earth is |
| A. | infinite. |
| B. | zero. |
| C. | same as on the surface of the earth. |
| D. | none of these. |
| Answer» C. same as on the surface of the earth. | |
| 1054. |
A machine having assumed life of 20 years is purchased for Rs 32000/-. Its scrap value at the end of its life is Rs 8000/-. If the depreciation is calculated by diminishing balance method, then percentage reduction in its value at the end of first year is __________ percent. |
| A. | 6.7 |
| B. | 7.6 |
| C. | 10.3 |
| D. | 15.2 |
| Answer» B. 7.6 | |
| 1055. |
The most important consideration, while designing the refrigeration system of an aircraft is that the refrigeration system |
| A. | is as light as possible. |
| B. | has very high C.O.P. |
| C. | employs minimum quantity of refrigerant. |
| D. | consumer minimum horse power. |
| Answer» B. has very high C.O.P. | |
| 1056. |
Pick out the correct statement about the condensation. |
| A. | Filmwise condensation gives a lower heat transfer rate than the dropwise condensation. |
| B. | Suitable coating or vapour additive is used to promote film wise condensation. |
| C. | If a condensing liquid does not wet the surface dropwise, even then condensation will take place on it. |
| D. | Reynolds number of condensing liquid is based on its mass flow rate. |
| Answer» C. If a condensing liquid does not wet the surface dropwise, even then condensation will take place on it. | |
| 1057. |
Faraday's law of electrolysis is related to the |
| A. | cation speed. |
| B. | atomic number of the cation. |
| C. | equivalent mass of the electrolyte. |
| D. | none of these. |
| Answer» D. none of these. | |
| 1058. |
In the floatation process, pine oil is used as the |
| A. | collector |
| B. | activator |
| C. | frother |
| D. | depressant |
| Answer» D. depressant | |
| 1059. |
Presence of sulphur in steel reduces the |
| A. | hardness. |
| B. | grain size. |
| C. | tensile strength. |
| D. | toughness & transverse ductility. |
| Answer» E. | |
| 1060. |
Grey cast iron (used for making underground water pipes and manhole covers) as compared to steel has higher |
| A. | ductility |
| B. | impact strength |
| C. | machinability |
| D. | melting point |
| Answer» D. melting point | |
| 1061. |
Puddling process is used for converting pig iron into |
| A. | cast iron |
| B. | wrought iron |
| C. | mild steel |
| D. | semi-steel |
| Answer» D. semi-steel | |
| 1062. |
On increasing the yield strength of a steel from 450 to 650 MPa, its __________ will increase. |
| A. | ultimate tensile strength (UTS) |
| B. | modulus of toughness |
| C. | percent elongation |
| D. | modulus of resilience |
| Answer» C. percent elongation | |
| 1063. |
Uniform ramming of sand in green sand moulding process leads to |
| A. | reduced chance of gas porosity. |
| B. | greater dimensional stability of the casting. |
| C. | uniform flow of molten metal into the mould cavity. |
| D. | less sand expansion type of casting defect. |
| Answer» C. uniform flow of molten metal into the mould cavity. | |
| 1064. |
Property responsible for the talcum powder to cling to the skin is the |
| A. | capillary action |
| B. | adhesion |
| C. | cohesion |
| D. | surface tension |
| Answer» C. cohesion | |
| 1065. |
Coarse grained steels have |
| A. | low toughness |
| B. | no tendency to distort |
| C. | high density |
| D. | very high toughness |
| Answer» C. high density | |
| 1066. |
α-rays are$ |
| A. | negatively charged. |
| B. | positively charged. |
| C. | neutral. |
| D. | same as X-rays. |
| Answer» C. neutral. | |
| 1067. |
Measurement of the area of the indented surface is not involved in the __________ hardhes testing method. |
| A. | Vicker's |
| B. | Rockwell |
| C. | Knoop |
| D. | Brinell |
| Answer» C. Knoop | |
| 1068. |
The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler. |
| A. | evaporative capacity |
| B. | evaporation efficiency |
| C. | thermal efficiency |
| D. | steam load |
| Answer» B. evaporation efficiency | |
| 1069. |
Which of the following has the highest value of refractive index ? |
| A. | Brine (sea water) |
| B. | Diamond |
| C. | Distilled water |
| D. | Glass |
| Answer» C. Distilled water | |
| 1070. |
Large diameter shafts are manufactured by |
| A. | hot rolling. |
| B. | cold drawing. |
| C. | casting and turning to size. |
| D. | forging and turning to size. |
| Answer» E. | |
| 1071. |
RADAR is |
| A. | acronym for Radio Detection and Ranging. |
| B. | name of technique for locating distant objects. |
| C. | name of instrument for locating distant objects. |
| D. | all (a), (b) & (c) |
| Answer» E. | |
| 1072. |
While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterised by the |
| A. | low impact strength. |
| B. | high flexibility. |
| C. | better finish and surface appearance. |
| D. | high plastic deformation. |
| Answer» B. high flexibility. | |
| 1073. |
Bad odour in sanitary latrines is reduced by periodically sprinkling |
| A. | bleaching powder. |
| B. | lime powder. |
| C. | aluminium sulphate. |
| D. | none of these. |
| Answer» C. aluminium sulphate. | |
| 1074. |
A pycnometer is used for the measurement of |
| A. | flow rate of molten metal. |
| B. | specific gravity of a liquid. |
| C. | composition of alloys. |
| D. | concentration of a solution. |
| Answer» C. composition of alloys. | |
| 1075. |
Electrolytes conduct electric current by |
| A. | the movement of ions. |
| B. | the movement of molecules. |
| C. | allowing electrons to flow through them from cathode to anode. |
| D. | movement of electric charge through them. |
| Answer» B. the movement of molecules. | |
| 1076. |
Preheating before welding is done to |
| A. | make the plate softer. |
| B. | burn oil & grease sticking to plate surfaces. |
| C. | avoid plate distortion. |
| D. | prevent cold cracks. |
| Answer» E. | |
| 1077. |
In case of a, centrifugal pump, the ratio h1/h2 is termed as the __________ efficiency (where, h1 = actual measured head & h2 = head imparted to the fluid by impeller). |
| A. | mechanical |
| B. | overall |
| C. | volumetric |
| D. | impeller |
| Answer» B. overall | |
| 1078. |
Dryness fraction of dry steam is |
| A. | 0 |
| B. | ‚àû |
| C. | 1 |
| D. | 0.5 |
| Answer» D. 0.5 | |
| 1079. |
A 2 kg object weighs 1.8 kgf on a spring balance. The value of 'g' at that location in m/sec2 is |
| A. | 8.82 |
| B. | 9.81 |
| C. | 10.88 |
| D. | 0.95 |
| Answer» B. 9.81 | |
| 1080. |
Circulation of liquid metal (i.e. molten sodium) in a liquid metal cooled nuclear reactor is done by a/an __________ pump. |
| A. | electromagnetic |
| B. | axial flow |
| C. | diaphragm |
| D. | reciprocating |
| Answer» B. axial flow | |
| 1081. |
The most suitable material for a sewer for carrying storm water is |
| A. | asbestos cement |
| B. | cast iron |
| C. | mild steel |
| D. | cement concrete |
| Answer» E. | |
| 1082. |
Fatigue strength of a material can not be increased by |
| A. | cold working |
| B. | hot working |
| C. | shot peening |
| D. | any of these |
| Answer» C. shot peening | |
| 1083. |
If Reynolds number is greater than 1, then the |
| A. | viscous force is larger than the inertia force. |
| B. | inertia force is larger than the viscous force. |
| C. | inertia force is larger than the surface tension force. |
| D. | inertia force is larger than the gravitational force. |
| Answer» C. inertia force is larger than the surface tension force. | |
| 1084. |
All the atoms of the world comprise of electrons, proton & neutron except that of __________ atom in which neutron is absent. |
| A. | deuterium |
| B. | hydrogen |
| C. | neon |
| D. | helium |
| Answer» C. neon | |
| 1085. |
Which set of materials is used as a moderator in nuclear reactor ? |
| A. | Zircalloy & berrylium. |
| B. | Zircalloy & heavy water. |
| C. | Zirconium & berrylium. |
| D. | Heavy water & berrelium. |
| Answer» E. | |
| 1086. |
Which of the following is an example of cathodic protection of metals against corrosion ? |
| A. | Painted steel |
| B. | Galvanised iron |
| C. | Case hardened steel |
| D. | Lead lined reactor |
| Answer» C. Case hardened steel | |
| 1087. |
Increase in the entropy of a system represents the |
| A. | degradation of energy. |
| B. | decrease in system pressure. |
| C. | increase in the availability of energy. |
| D. | increase in the temperature. |
| Answer» B. decrease in system pressure. | |
| 1088. |
Annealing of cast iron |
| A. | softens it to facilitate machining. |
| B. | decreases the free carbon. |
| C. | increases the strength. |
| D. | none of these. |
| Answer» B. decreases the free carbon. | |
| 1089. |
'Ice point' is designated on Farenhite temperature scale by |
| A. | 0° |
| B. | 32° |
| C. | 62° |
| D. | 212° |
| Answer» C. 62¬∞ | |
| 1090. |
Out of the following, maximum temperature drop for a given heat flow & for the same thickness will be in the case of |
| A. | steel |
| B. | glass wood |
| C. | copper |
| D. | fireclay bricks |
| Answer» C. copper | |
| 1091. |
The primary strengthening mechanism in 70 : 30 brass is the |
| A. | solid solution strengthening. |
| B. | precipitation hardening. |
| C. | dispersion strengthening. |
| D. | order hardening. |
| Answer» B. precipitation hardening. | |
| 1092. |
__________ is the most suitable lubricant for drawing mild steel wires? |
| A. | Kerosene |
| B. | Water |
| C. | Sodium stearate |
| D. | Lime water |
| Answer» D. Lime water | |
| 1093. |
Use of flux during soldering is done to |
| A. | increase flidity of solder by lowering its melting temperature. |
| B. | prevent oxide formation. |
| C. | wash away surplus solder. |
| D. | full up the joint gap. |
| Answer» C. wash away surplus solder. | |
| 1094. |
The concentration of (H+) ions is 4 x 10-5 in a solution. Then pH of the solution will be (Given log 4 = 0.6 ) |
| A. | 4.4 |
| B. | 5.6 |
| C. | 8.4 |
| D. | 2.4 |
| Answer» B. 5.6 | |
| 1095. |
Presence of nickel & chromium in steel does not raise its |
| A. | elastic limit |
| B. | machining properties |
| C. | ductility |
| D. | resilience |
| Answer» B. machining properties | |
| 1096. |
What is the percentage of chromium in 18-4-1 high speed steel ? |
| A. | 1 |
| B. | 4 |
| C. | 18 |
| D. | 23 |
| Answer» D. 23 | |
| 1097. |
'GASOHOL' widely used in Brazil as a motor fuel is a mixture of alcohol and |
| A. | petrol. |
| B. | LPG. |
| C. | light hydrocarbon gases (e.g. butane or propane). |
| D. | none of these. |
| Answer» B. LPG. | |
| 1098. |
The activity of pure hydrogen gas at 1000°C and 5 atm pressure$ |
| A. | is always less than 1. |
| B. | is always greater than 1. |
| C. | can be 5. |
| D. | depends on the choice of the standard state. |
| Answer» E. | |
| 1099. |
Brazing is the joining of metals |
| A. | without melting the base metal. |
| B. | with a non-ferrous filler. |
| C. | both (a) & (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 1100. |
The escape velocity of a body on earth which is independent of its mass is about __________ km/second. |
| A. | 3 |
| B. | 7 |
| C. | 11 |
| D. | 15 |
| Answer» D. 15 | |