MCQOPTIONS
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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.
| 7751. |
Which of the following pair is correctly matched? |
| A. | Heat transfer: Thermal diffusivity. |
| B. | Mass transfer: Diffusion co-efficient. |
| C. | Momentum transfer: Kinematic viscosity. |
| D. | all 'a', 'b' & 'c' are correctly matched. |
| Answer» E. | |
| 7752. |
Rate of chemical reaction is not much affected, if the reactants are in __________ form. |
| A. | solids |
| B. | liquids |
| C. | either (a) or (b) |
| D. | gaseous |
| Answer» D. gaseous | |
| 7753. |
Materials used for making permanent magnets containing iron and nickel are made by __________ technique. |
| A. | powder metallurgy |
| B. | casting |
| C. | forging |
| D. | none of these |
| Answer» D. none of these | |
| 7754. |
Lubrication is done to control |
| A. | friction |
| B. | wear |
| C. | temperature |
| D. | all (a), (b) & (c) |
| Answer» E. | |
| 7755. |
Which of the following is a boiler accessory i.e., not a boiler mounting ? |
| A. | Blow off cock |
| B. | Feed check valve |
| C. | Feed water pump |
| D. | Stop valve |
| Answer» D. Stop valve | |
| 7756. |
Which of the following forces does not act on a fluid at rest ? |
| A. | Viscous force |
| B. | Gravity force |
| C. | Hydrostatic force |
| D. | Surface tension force |
| Answer» B. Gravity force | |
| 7757. |
Density in the solid state is slightly less than that in its liquid state, in case of |
| A. | carbon dioxide |
| B. | water |
| C. | mercury |
| D. | none of these. |
| Answer» C. mercury | |
| 7758. |
Ceramic materials |
| A. | are exemplified by clay and mica. |
| B. | are poor electrical conductors due to lack of free electrons. |
| C. | never exhibit polymorphism. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 7759. |
Light weight metallic alloy used in aircraft industry is |
| A. | aluminium |
| B. | high silicon (14%) iron |
| C. | duralumin |
| D. | phosphor bronze |
| Answer» D. phosphor bronze | |
| 7760. |
Which of the following is an alloy of nickel and copper ? |
| A. | Hastelloy |
| B. | Duriron |
| C. | Monel |
| D. | Inconel |
| Answer» D. Inconel | |
| 7761. |
Gunmetal and bronze are not corroded by the action of |
| A. | wet chlorine. |
| B. | synthetic detergent solution. |
| C. | hydrochloric acid (10%). |
| D. | nitric acid (< 25%). |
| Answer» C. hydrochloric acid (10%). | |
| 7762. |
Atmospheric corrosion of metals result from their |
| A. | slow oxidation |
| B. | fast oxidation |
| C. | fast hydration |
| D. | slow dehydration |
| Answer» B. fast oxidation | |
| 7763. |
Aqueous nitric acid is stored in |
| A. | steel drum |
| B. | stainless steel vessel |
| C. | cast iron vessel lined with acid-proof masonry brick |
| D. | cast iron vessel |
| Answer» C. cast iron vessel lined with acid-proof masonry brick | |
| 7764. |
Addition of tungsten to steel imparts |
| A. | magnetic properties |
| B. | cutting hardness |
| C. | corrosion resistance |
| D. | ductility |
| Answer» C. corrosion resistance | |
| 7765. |
Hot working of lead is carried out at |
| A. | 75 C |
| B. | 373 K |
| C. | 150 C |
| D. | room temperature |
| Answer» E. | |
| 7766. |
Thermometer bulb & capillary in case of mercury filled pressure spring expansion thermometer is normally made of __________ as mercury does not amalgamate with it. |
| A. | copper |
| B. | copper alloys |
| C. | stainless steel |
| D. | monel |
| Answer» D. monel | |
| 7767. |
Presence of silicon in steel |
| A. | is in the form of free Si. |
| B. | indicates that steel is not deoxidised properly. |
| C. | decreases the blow holes formation tendency in castings. |
| D. | none of these. |
| Answer» D. none of these. | |
| 7768. |
Pick the odd man out of the following. |
| A. | Calorising |
| B. | Pack carburising |
| C. | Nitriding |
| D. | Cyaniding |
| Answer» B. Pack carburising | |
| 7769. |
Cold work tool steel should have |
| A. | high toughness |
| B. | poor hardenability |
| C. | high wear resistance |
| D. | all (a), (b) & (c) |
| Answer» D. all (a), (b) & (c) | |
| 7770. |
Phenol is not shipped in |
| A. | nickel lined steel tank cars. |
| B. | galvanised or tin lined drums. |
| C. | boxed glass carboys. |
| D. | cast iron containers. |
| Answer» E. | |
| 7771. |
To improve the machinability of steel, it is generally subjected to |
| A. | spheroidising |
| B. | tempering |
| C. | normalising |
| D. | annealing |
| Answer» B. tempering | |
| 7772. |
Hardening of steel is not possible unless it is heated __________ critical point. |
| A. | above the highest |
| B. | above the lowest |
| C. | between the first & second |
| D. | between the second & third |
| Answer» C. between the first & second | |
| 7773. |
Hydrochloric acid absorber in made of |
| A. | cast iron |
| B. | mild steel |
| C. | karbate |
| D. | stainless steel |
| Answer» D. stainless steel | |
| 7774. |
__________ is not a case hardening process. |
| A. | Carburising |
| B. | Nitriding |
| C. | Cyaniding |
| D. | Annealing |
| Answer» E. | |
| 7775. |
Materials having __________ lattice structure are usually most ductile. |
| A. | f.c.c. |
| B. | b.c.c. |
| C. | h.c.p. |
| D. | cubic |
| Answer» B. b.c.c. | |
| 7776. |
Invar contains the highest percentage of |
| A. | vanadium |
| B. | iron |
| C. | tungsten |
| D. | cobalt |
| Answer» C. tungsten | |
| 7777. |
The ability of a material to absorb energy in the elastic range is a measure of its |
| A. | toughness |
| B. | resilience |
| C. | malleability |
| D. | brittleness |
| Answer» C. malleability | |
| 7778. |
Graphite is a good |
| A. | thermal & electrical insulator. |
| B. | conductor of heat. |
| C. | conductor of electricity. |
| D. | both (b) & (c). |
| Answer» E. | |
| 7779. |
Lead alone is not used in storing equipment, because it |
| A. | is very costly. |
| B. | corrodes easily. |
| C. | is having low creep strength. |
| D. | none of these. |
| Answer» D. none of these. | |
| 7780. |
H2SO4 (< 50% concentration) is corrosive to |
| A. | aluminium, mild steel, stainless steel, concrete & tin. |
| B. | copper, cast iron & high silicon iron (14% Si). |
| C. | rubber (butyl and hard), silicone rubber & teflon. |
| D. | glass, graphite, porcelain & stoneware. |
| Answer» B. copper, cast iron & high silicon iron (14% Si). | |
| 7781. |
In the Kraft process of sulphate paper pulp manufacture, the black liquor and the white liquor storage tank is made of |
| A. | concrete |
| B. | wood |
| C. | steel |
| D. | porcelain |
| Answer» D. porcelain | |
| 7782. |
A bearing metal should not have |
| A. | enough plasticity. |
| B. | low thermal conductivity. |
| C. | low co-efficient of friction. |
| D. | high toughness. |
| Answer» C. low co-efficient of friction. | |
| 7783. |
Which of the following is the easiest to bend? |
| A. | Steel |
| B. | Stainless steel |
| C. | Cast iron |
| D. | Wrought iron |
| Answer» E. | |
| 7784. |
Common house hold glass (i.e., soda-lime glass) is a/an __________ material. |
| A. | fully crystalline |
| B. | partly crystalline |
| C. | amorphous |
| D. | none of these |
| Answer» C. amorphous | |
| 7785. |
In the kraft (sulphate) process for the paper manufacture, the digestor is made of |
| A. | cast iron |
| B. | stainless steel |
| C. | karbate carbon |
| D. | wrought iron |
| Answer» C. karbate carbon | |
| 7786. |
Cast iron and steel pipes are produced by __________ casting. |
| A. | die |
| B. | investment |
| C. | slush |
| D. | true centrifugal |
| Answer» E. | |
| 7787. |
Which of the following has the poorest wel-dability ? |
| A. | Low carbon steel |
| B. | Mild steel |
| C. | Wrought iron |
| D. | High-carbon steel |
| Answer» E. | |
| 7788. |
Creep is not exhibited at low temperature by |
| A. | rubber |
| B. | acrylics |
| C. | lead |
| D. | plastics |
| Answer» D. plastics | |
| 7789. |
Nickel and molybdenum are the basic constituents of |
| A. | hastealloy |
| B. | German silver |
| C. | inconel |
| D. | solder |
| Answer» B. German silver | |
| 7790. |
White cast iron as compared to grey cast iron is |
| A. | more durable |
| B. | very brittle |
| C. | very hard |
| D. | all (a), (b) & (c) |
| Answer» E. | |
| 7791. |
__________ iron is produced, when molten pig iron is chilled suddenly. |
| A. | White cast |
| B. | Grey cast |
| C. | Wrought |
| D. | none of these |
| Answer» B. Grey cast | |
| 7792. |
Which of the following is the most suitable material of construction for evaporator & its tubes for concentrating NaOH solution to 70%? |
| A. | Cast iron |
| B. | Steel |
| C. | Nickel |
| D. | Karbate |
| Answer» D. Karbate | |
| 7793. |
Visco-elastic behaviour of materials which is time dependent is common in |
| A. | plastics |
| B. | crystalline solid |
| C. | non-crystalline solids |
| D. | non-crystalline organic polymer |
| Answer» E. | |
| 7794. |
Which of the following is not an alloy of copper ? |
| A. | Muntz metal |
| B. | Admirability gun metal |
| C. | German silver |
| D. | Pewter metal |
| Answer» E. | |
| 7795. |
Which of the following is the most prone to atmospheric corrosion ? |
| A. | Silver |
| B. | Iron |
| C. | Tin |
| D. | Copper |
| Answer» C. Tin | |
| 7796. |
As the impurities are oxidised, the melting point of iron |
| A. | decreases. |
| B. | remains unchanged. |
| C. | increases. |
| D. | may increase or decrease ; unpredictable. |
| Answer» D. may increase or decrease ; unpredictable. | |
| 7797. |
In a plate type heat exchanger, heat transfer plates are never made of |
| A. | stainless steel |
| B. | cast iron |
| C. | titanium |
| D. | hastealloy C |
| Answer» C. titanium | |
| 7798. |
Acetaldehyde is shipped in __________ drums. |
| A. | cast iron |
| B. | steel |
| C. | aluminium |
| D. | either (b) & (c) |
| Answer» E. | |
| 7799. |
German silver is an alloy of copper, nickel and |
| A. | zinc |
| B. | silver |
| C. | tin |
| D. | lead |
| Answer» B. silver | |
| 7800. |
Cast iron compared to steel is better in |
| A. | ductility |
| B. | fluidity & castability |
| C. | strength |
| D. | malleability |
| Answer» C. strength | |