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.
| 1551. |
Waste heat from the outgoing flue gases in a thermal power plant is recovered by a/an |
| A. | economiser |
| B. | steam superheater |
| C. | air preheater |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 1552. |
In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the |
| A. | rate of firing and emissivity of flame. |
| B. | thermal conductivity of the charge & structural materials of furnace. |
| C. | nature of process ; whether batch, continuous or intermittant. |
| D. | all (a), (b) and (c) |
| Answer» E. | |
| 1553. |
In which of the following furnaces, the gases are sucked through the stock bed from below? |
| A. | Soaking pit |
| B. | Sintering machine |
| C. | Beehive oven |
| D. | None of these |
| Answer» C. Beehive oven | |
| 1554. |
__________ is an indirectly heated furnace. |
| A. | Open hearth furnace |
| B. | Muffle furnace |
| C. | Soaking pit |
| D. | Reheating furnace |
| Answer» C. Soaking pit | |
| 1555. |
The thermal efficiency of an air/fuel gas preheating recuperator may be as high as __________ percent. |
| A. | 50 |
| B. | 65 |
| C. | 85 |
| D. | 99 |
| Answer» D. 99 | |
| 1556. |
Which is not a hearth furnace ? |
| A. | Glass tank furnace |
| B. | Open hearth furnace |
| C. | Cupola |
| D. | Reheating furnace |
| Answer» D. Reheating furnace | |
| 1557. |
An example of shaft furnace is the |
| A. | L.D. converter |
| B. | glass melting tank |
| C. | blast furnace |
| D. | soaking pit |
| Answer» D. soaking pit | |
| 1558. |
In a muffle furnace, the muffle |
| A. | retards the heat transfer. |
| B. | assists in temperature equalisation in the charge. |
| C. | permits the use of controlled atmosphere for the protection of stock. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1559. |
Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent. |
| A. | 20 |
| B. | 40 |
| C. | 60 |
| D. | 80 |
| Answer» E. | |
| 1560. |
Which of the following is not an additive for flue gases from furnace to reduce its dew-point? |
| A. | Ammonia |
| B. | Fine dolomite |
| C. | Alkaline powders |
| D. | None of these |
| Answer» E. | |
| 1561. |
Low stack loss indicates the |
| A. | use of sub-stoichiometric air for combustion. |
| B. | efficient use of fuel. |
| C. | inefficient use of fuel. |
| D. | oxygen enrichment of combustion air. |
| Answer» C. inefficient use of fuel. | |
| 1562. |
The reason for excessive clinker formation in gas producers is the |
| A. | use of coal/coke containing a high % of fines and ash. |
| B. | use of fuel having too low an ash fusion temperature. |
| C. | development of hot spots in the fuel bed and an abnormally high rate of gasification. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1563. |
Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about __________ °C. |
| A. | 80 |
| B. | 130 |
| C. | 180 |
| D. | 250 |
| Answer» C. 180 | |
| 1564. |
In order to maintain a reducing atmosphere in a furnace, it should have |
| A. | no O₂ in flue gas |
| B. | CO in flue gas |
| C. | high excess air |
| D. | none of these |
| Answer» C. high excess air | |
| 1565. |
The heat recoverable from flue gases of furnaces depends on the |
| A. | thermal efficiency of furnace. |
| B. | quantity of flue gases. |
| C. | flue gas temperature drop through the furnace. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 1566. |
Which is the most thermally efficient furnace ? |
| A. | Reheating furnace |
| B. | Reverberatory furnace |
| C. | Rotary kilns |
| D. | Boiler furnace |
| Answer» E. | |
| 1567. |
Which is a continuous furnace ? |
| A. | Coke ovens |
| B. | Annealing furnace |
| C. | Glass tank furnace |
| D. | None of these |
| Answer» D. None of these | |
| 1568. |
Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ °C. |
| A. | 250 |
| B. | 650 |
| C. | 850 |
| D. | 1000 |
| Answer» C. 850 | |
| 1569. |
The operation of removing humps and hollows of uniform concrete surface, is known as |
| A. | floating |
| B. | screeding |
| C. | trowelling |
| D. | finishing |
| Answer» C. trowelling | |
| 1570. |
According to IS : 382-1963, a good aggregate should be |
| A. | chemically inert |
| B. | sufficiently strong |
| C. | hard and durable |
| D. | all the above. |
| Answer» E. | |
| 1571. |
Addition of pozzolana to ordinary port land cement, causes |
| A. | decrease in early strength |
| B. | reduction in chemical action with sulphates |
| C. | increase in shrinkage |
| D. | all the above. |
| Answer» E. | |
| 1572. |
Pick up the correct statement from the following i. |
| A. | Higher workability indicates unexpected increase in the moisture content |
| B. | Higher workability indicates deficiency of sand |
| C. | If the concrete mix is dry, the slump is zero |
| D. | All the above. |
| Answer» E. | |
| 1573. |
When a pattern is made in three parts, the bottom part is known as a cope. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1574. |
The bloom is smaller than a billet. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 1575. |
When a hole or cavity to be cored is not in line with the parting surface, then a __________ is used. |
| A. | horizontal core |
| B. | vertical core |
| C. | drop core |
| D. | balanced core |
| Answer» D. balanced core | |
| 1576. |
In average work, the tolerance produced by investment casting method is |
| A. | ±0.05 mm |
| B. | +0.2 mm |
| C. | +05 mm |
| D. | +1 mm |
| Answer» B. +0.2 mm | |
| 1577. |
The algebraic difference between the maximum limit and the basic size is called |
| A. | actual deviation |
| B. | upper deviation |
| C. | lower deviation |
| D. | fundamental deviation |
| Answer» C. lower deviation | |
| 1578. |
The ferrous metals require more machining allowance than non-ferrous metals. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 1579. |
Galvanising is a |
| A. | zinc diffusion process |
| B. | process of coating zinc by hot dipping |
| C. | process used for making thin phosphate coating on steel |
| D. | none of the above |
| Answer» C. process used for making thin phosphate coating on steel | |
| 1580. |
In a four high rolling mill, there are four rolls out of which |
| A. | one is working roll and three are backing up rolls |
| B. | two are working rolls and two are backing up rolls |
| C. | three are working rolls and one is backing up roll |
| D. | all of the four are working rolls |
| Answer» C. three are working rolls and one is backing up roll | |
| 1581. |
The cold chisels are made by |
| A. | drawing |
| B. | rolling |
| C. | piercing |
| D. | forging |
| Answer» E. | |
| 1582. |
The machining allowance provided on patterns depends upon |
| A. | type of casting metal |
| B. | size and shape of casting |
| C. | method of casting used |
| D. | all of these |
| Answer» E. | |
| 1583. |
The centrifugal casting method, is used for casting articles of |
| A. | symmetrical shape about vertical axis |
| B. | symmetrical shape about horizontal axis |
| C. | irregular shape |
| D. | non-ferrous metal only |
| Answer» C. irregular shape | |
| 1584. |
The fullers are used |
| A. | for finishing flat surfaces |
| B. | for necking down a piece of work |
| C. | for punching a hole |
| D. | to finish the punched hole |
| Answer» C. for punching a hole | |
| 1585. |
In a die casting method, the molten metal is forced into mould under high pressure. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 1586. |
In a centrifugal casting method, the impurities are collected in the centre of the casting. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 1587. |
In submerged arc welding, an arc is produced between a |
| A. | carbon electrode and the work |
| B. | metal electrode and the work |
| C. | bare metal electrode and the work |
| D. | two tungsten electrodes and the work |
| Answer» D. two tungsten electrodes and the work | |
| 1588. |
In a bilateral system of tolerance, the tolerance is allowed on |
| A. | one side of the actual size |
| B. | one side of the nominal size |
| C. | both sides of the actual size |
| D. | both sides of the nominal size |
| Answer» E. | |
| 1589. |
The draft or taper allowance on casting is generally |
| A. | 1 to 2 mm/m |
| B. | 2 to 5 mm/m |
| C. | 5 to 10 mm/m |
| D. | 10 to 15 mm/m |
| Answer» B. 2 to 5 mm/m | |
| 1590. |
In arc welding, the electric arc is produced between the work and the electrode by |
| A. | voltage |
| B. | flow of current |
| C. | contact resistance |
| D. | all of these |
| Answer» D. all of these | |
| 1591. |
Which of the following welding process uses non-consumable electrodes? |
| A. | TIG welding |
| B. | MIG welding |
| C. | Manual arc welding |
| D. | Submerged arc welding |
| Answer» B. MIG welding | |
| 1592. |
In a centrifugal casting method |
| A. | core is made of sand |
| B. | core is made of ferrous metal |
| C. | core is made of non-ferrous metal |
| D. | no core is used |
| Answer» E. | |
| 1593. |
The electrodes used in spot welding have a tip of |
| A. | stainless steel |
| B. | aluminium |
| C. | copper |
| D. | brass |
| Answer» D. brass | |
| 1594. |
Which of the following methods can be used for manufacturing 2 metre long seamless metallic tubes? |
| A. | Drawing |
| B. | Extrusion |
| C. | Rolling |
| D. | Extrusion and rolling |
| Answer» E. | |
| 1595. |
A taper provided on the pattern for its easy and clean withdrawl from the mould is known as |
| A. | machining allowance |
| B. | draft allowance |
| C. | shrinkage allowance |
| D. | distortion allowance |
| Answer» C. shrinkage allowance | |
| 1596. |
Blanking and piercing operations can be performed simultaneously in a |
| A. | simple die |
| B. | progressive die |
| C. | compound die |
| D. | combination die |
| Answer» D. combination die | |
| 1597. |
The type of file used for a wood work is |
| A. | single-cut file |
| B. | double cut file |
| C. | rasp-cut file |
| D. | any one of these |
| Answer» D. any one of these | |
| 1598. |
Surface plate is used to check the trueness of flat surfaces. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 1599. |
The temperature of oxy-hydrogen flame is __________ oxy-acetylene flame. |
| A. | same as |
| B. | less than |
| C. | more than |
| D. | None of these |
| Answer» C. more than | |
| 1600. |
The accuracy of micrometers, calipers, dial indicators can be checked by a |
| A. | feeler gauge |
| B. | slip gauge |
| C. | ring gauge |
| D. | plug gauge |
| Answer» C. ring gauge | |