MCQOPTIONS
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MCQOPTIONS
This section includes 2171 Mcqs, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1651. |
When two metal pieces of different thicknesses are to be welded by projection welding, then the projections should be made on __________ metal piece. |
| A. | thinner |
| B. | thicker |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1652. |
The operation of producing cup shaped parts from flat sheet metal blanks by bending and plastic flow of metal, is known as |
| A. | drawing |
| B. | squeezing |
| C. | coining |
| D. | planishing |
| Answer» B. squeezing | |
| 1653. |
The minimum size of a bloom is |
| A. | 5 cm x 5 cm |
| B. | 10 cm x 10 cm |
| C. | 15 cm x 15 cm |
| D. | 20 cm x 20 cm |
| Answer» D. 20 cm x 20 cm | |
| 1654. |
In fore-hand welding, the weld is made |
| A. | from left to right |
| B. | from right to left |
| C. | first from left to right and then from right to left |
| D. | either from left to right or from right to left |
| Answer» C. first from left to right and then from right to left | |
| 1655. |
Swab is used for |
| A. | smoothing and cleaning out depressions in the mould |
| B. | cleaning the moulding sand |
| C. | moistening the sand around the edge before removing pattern |
| D. | reinforcement of sand in the top part of the moulding box |
| Answer» D. reinforcement of sand in the top part of the moulding box | |
| 1656. |
The welding process used in joining mild steel shanks to high speed drills, is |
| A. | spot welding |
| B. | seam welding |
| C. | flash butt welding |
| D. | upset butt welding |
| Answer» D. upset butt welding | |
| 1657. |
An oxidising flame is obtained when equal volumes of oxygen and acetylene are supplied. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1658. |
A large electrode is used in un-shielded arc welding. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 1659. |
In a cold chamber die casting machine |
| A. | melting pot is separate from the machine |
| B. | melting pot is an integral part of the machine |
| C. | melting pot may have any location |
| D. | low temperature and pressure is used |
| Answer» B. melting pot is an integral part of the machine | |
| 1660. |
The purpose of a gate is to |
| A. | deliver molten metal into the mould cavity |
| B. | act as a reservoir for the molten metal |
| C. | feed the molten metal to the casting in order to compensate for the shrinkage |
| D. | deliver molten metal from pouring basin to gate |
| Answer» B. act as a reservoir for the molten metal | |
| 1661. |
The oxidising flame is similar to neutral flame but the inner cone is less luminous and shorter. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 1662. |
The torch used for oxygen cutting is same as for oxy-acetylene welding. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1663. |
Sand wash is a casting defect which |
| A. | results in a mismatching of the top and bottom parts of a casting |
| B. | results in general enlargement of the casting |
| C. | occurs near the ingates as rough lumps on the surface of a casting |
| D. | occurs as sand patches on the upper surface of a casting |
| Answer» D. occurs as sand patches on the upper surface of a casting | |
| 1664. |
The two rolls in a two high rolling mills are of __________ size. |
| A. | equal |
| B. | different |
| C. | Can't say |
| D. | None of these |
| Answer» B. different | |
| 1665. |
A stripper-plate machine is used to draw the pattern from the mould. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 1666. |
Forming is the operation of removing metal to the desired shape from the edge of a plate. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1667. |
The property of sand due to which it evolves a great amount of steam and other gases is called |
| A. | collapsibility |
| B. | permeability |
| C. | cohesiveness |
| D. | adhesiveness |
| Answer» C. cohesiveness | |
| 1668. |
Cast iron and steel pipes are produced by |
| A. | slush casting |
| B. | investment casting |
| C. | true centrifugal casting |
| D. | die casting |
| Answer» D. die casting | |
| 1669. |
The tolerance produced by shell moulding process of casting is |
| A. | +0.05 mm |
| B. | ±0.2 mm |
| C. | +0.5 mm |
| D. | ±1 mm |
| Answer» C. +0.5 mm | |
| 1670. |
In piercing operation, the clearance is provided on |
| A. | punch |
| B. | die |
| C. | half on the punch and half on the die |
| D. | either on punch or die depending upon designer's choice |
| Answer» C. half on the punch and half on the die | |
| 1671. |
In shielded arc welding |
| A. | large electrode is used |
| B. | welding rod coated with slag is used |
| C. | welding rod coated with fluxing material is used |
| D. | none of the above |
| Answer» D. none of the above | |
| 1672. |
For smoothing and cleaning out depressions in the mould, a __________ is used. |
| A. | slick |
| B. | lifter |
| C. | swab |
| D. | gagger |
| Answer» C. swab | |
| 1673. |
A casting defect which occurs due to improper venting of sand is known as |
| A. | cold shuts |
| B. | blow holes |
| C. | shift |
| D. | swell |
| Answer» C. shift | |
| 1674. |
The teeth of hacksaw blade are bent |
| A. | towards right |
| B. | towards left |
| C. | alternately towards right and left and every third or fourth left straight |
| D. | may be bent in any direction |
| Answer» D. may be bent in any direction | |
| 1675. |
The width of slot cut by a hacksaw blade is __________ the width of the blade. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| D. | None of these |
| Answer» D. None of these | |
| 1676. |
A neutral flame is obtained by supplying |
| A. | equal volumes of oxygen and acetylene |
| B. | more volume of oxygen and less volume of acetylene |
| C. | more volume of acetylene and less volume of oxygen |
| D. | none of the above |
| Answer» B. more volume of oxygen and less volume of acetylene | |
| 1677. |
Lap joints are employed on plates having thickness |
| A. | less than 3 mm |
| B. | 5 to 10 mm |
| C. | 12.5 mm |
| D. | above 25 mm |
| Answer» B. 5 to 10 mm | |
| 1678. |
The low pressure acetylene is produced at the welding site by the chemical reaction between water and calcium carbonate. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1679. |
In a compound die |
| A. | only one operation is performed at each stroke of the ram |
| B. | two or more operations are performed simultaneously at the single stroke of the ram |
| C. | two or more cutting operations are performed at one station of the press in every stroke of the ram |
| D. | both cutting and non-cutting operations are performed at one station of the press in every stroke of the ram |
| Answer» D. both cutting and non-cutting operations are performed at one station of the press in every stroke of the ram | |
| 1680. |
Hot piercing is extensively used for making bolts and nuts. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1681. |
For welding plates of thickness less than 5 mm, its edges |
| A. | do not require bevelling |
| B. | should be bevelled to a single-V or U-groove |
| C. | should have a double-V or U-groove on one side |
| D. | should have a double-V or U-groove on both sides |
| Answer» B. should be bevelled to a single-V or U-groove | |
| 1682. |
Cold working of metal increases |
| A. | tensile strength |
| B. | yield strength |
| C. | hardness |
| D. | all of these |
| Answer» E. | |
| 1683. |
When the molten metal is fed in the cavity of a metallic mould by gravity, the method of casting is known as |
| A. | die casting method |
| B. | slush casting method |
| C. | permanent mould casting method |
| D. | centrifugal casting method |
| Answer» D. centrifugal casting method | |
| 1684. |
A sand employed on the faces of the pattern before moulding, is called |
| A. | green sand |
| B. | dry sand |
| C. | loam sand |
| D. | parting sand |
| Answer» E. | |
| 1685. |
The cutting edge of a chisel should be |
| A. | hardened |
| B. | tempered |
| C. | hardened and tempered |
| D. | case hardened |
| Answer» D. case hardened | |
| 1686. |
For gas welding, the pressure desired at the welding torch for oxygen is |
| A. | 7 to 103 kN/m² |
| B. | 70 to 280 kN/m² |
| C. | 280 to 560 kN/m² |
| D. | 560 to 840 kN/m² |
| Answer» C. 280 to 560 kN/m² | |
| 1687. |
The operation of cutting a sheet of metal in a straight line along the length, is known as |
| A. | plunging |
| B. | notching |
| C. | slitting |
| D. | forming |
| Answer» D. forming | |
| 1688. |
The flux commonly used in brazing is |
| A. | zinc chloride |
| B. | ammonium chloride |
| C. | rosin plus alcohol |
| D. | borax |
| Answer» E. | |
| 1689. |
A zinc diffusion process is called |
| A. | galvanising |
| B. | anodising |
| C. | parkerising |
| D. | sherardizing |
| Answer» E. | |
| 1690. |
Tandem drawing of wires and tubes is necessary because |
| A. | it is not possible to reduce at one stage |
| B. | annealing is needed between stages |
| C. | accuracy in dimensions is not possible otherwise |
| D. | surface finish improves after every drawing stage |
| Answer» C. accuracy in dimensions is not possible otherwise | |
| 1691. |
The essential ingradient of all the synthesis gas is |
| A. | H₂ |
| B. | O₂ |
| C. | CO₂ |
| D. | N₂ |
| Answer» B. O₂ | |
| 1692. |
P₂O₅ content in superphosphate is about __________ percent. |
| A. | 30-35 |
| B. | 15-20 |
| C. | 65-70 |
| D. | 85-90 |
| Answer» C. 65-70 | |
| 1693. |
In an ammonia plant, the purge off is essential to |
| A. | maintain inert gas concentration within a limit. |
| B. | remove excess poisonous gases. |
| C. | maintain H₂ : N₂ ratio at 3 :1. |
| D. | remove uncondensed ammonia vapour. |
| Answer» D. remove uncondensed ammonia vapour. | |
| 1694. |
Fertilizer plant getting its hydrogen requirement partly from coke oven gas is situated at |
| A. | Rourkela (under SAIL) |
| B. | Barauni (under HFC) |
| C. | Nangal (under NFL) |
| D. | Talchar (under FCI) |
| Answer» B. Barauni (under HFC) | |
| 1695. |
Ammonium nitrate is |
| A. | having about 40% N₂. |
| B. | not hygroscopic. |
| C. | not prone to explosive thermal decomposition. |
| D. | mixed with limestone powder to reduce its explosive nature before using it as a fertilizer. |
| Answer» E. | |
| 1696. |
__________ is the undesirable by-product produced in the manufacture of urea. |
| A. | Ammonium carbonate |
| B. | Biuret |
| C. | Carbon dioxide |
| D. | Ammonium carbamate |
| Answer» C. Carbon dioxide | |
| 1697. |
Potassic fertilisers do not promote the development of |
| A. | stems & leaves during early stage of plant growth. |
| B. | starches of potatoes & grains. |
| C. | sugar of fruits & vegetables. |
| D. | fibrous materials of plants. |
| Answer» B. starches of potatoes & grains. | |
| 1698. |
Raw materials for nitric acid manufacture are |
| A. | hydrogen peroxide, air and water. |
| B. | anhydrous ammonia and air. |
| C. | anhydrous ammonia, air and water. |
| D. | wet ammonia, air and water. |
| Answer» D. wet ammonia, air and water. | |
| 1699. |
Iron is not used alone as a catalyst in ammonia synthesis, because |
| A. | its activity declines rapidly, if heated to above 520°C. |
| B. | it decomposes ammonia. |
| C. | it gets oxidised above 500°C. |
| D. | none of these. |
| Answer» B. it decomposes ammonia. | |
| 1700. |
Which nutrient in fertiliser makes the plant stems stronger and increases branching ? |
| A. | Nitrogen |
| B. | Phosphorous |
| C. | Potassium |
| D. | Calcium |
| Answer» C. Potassium | |