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MCQOPTIONS
This section includes 4791 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1551. |
An imbalance wheel during vehicle operation |
| A. | makes large noise when its heavy point hits the road surface |
| B. | deflects in the vehicle's longitudinal direction |
| C. | bounces vertically or deflects from side to side (as seen from front or rear) |
| D. | creates a standing wave |
| Answer» D. creates a standing wave | |
| 1552. |
The anti-knock property of compression ignition engine fuel can be improved by adding |
| A. | tetraethyl lead |
| B. | trimethyl pentane |
| C. | amyl nitrate |
| D. | hexadecane |
| Answer» D. hexadecane | |
| 1553. |
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. | |
| 1554. |
The oxygen cylinder is usually painted with |
| A. | black colour |
| B. | white colour |
| C. | maroon colour |
| D. | yellow colour |
| Answer» B. white colour | |
| 1555. |
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 | |
| 1556. |
Thermit, used in thermit welding, is a mixture of |
| A. | charcoal and iron oxide |
| B. | charcoal and aluminium |
| C. | iron oxide and aluminium |
| D. | charcoal, iron oxide and aluminium |
| Answer» D. charcoal, iron oxide and aluminium | |
| 1557. |
The width of slot cut by a hacksaw blade is __________ the width of the blade. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| Answer» D. | |
| 1558. |
A gimlet is a __________ tool. |
| A. | boring |
| B. | marking |
| Answer» B. marking | |
| 1559. |
The recrystallisation temperature of steel is |
| A. | 400 C |
| B. | 600 C |
| C. | 800 C |
| D. | none of these |
| Answer» D. none of these | |
| 1560. |
Piercing is an operation of cutting |
| A. | a cylindrical hole in a sheet of metal by the punch and the die |
| B. | a hole (other than cylindrical) in a sheet of metal by the punch and the die |
| C. | a flat sheet to the desired shape |
| D. | a number of holes evenly spaced in a regular pattern on a sheet of metal |
| Answer» C. a flat sheet to the desired shape | |
| 1561. |
Acetylene gas is stored in cylinders in |
| A. | solid form |
| B. | gaseous form |
| C. | liquid form |
| D. | any one of these |
| Answer» D. any one of these | |
| 1562. |
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 | |
| 1563. |
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 | |
| 1564. |
A hacksaw blade is specified by its |
| A. | length |
| B. | material |
| C. | width |
| D. | number of teeth |
| Answer» B. material | |
| 1565. |
A device used in a boiler to control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required, is known as |
| A. | blow off cock |
| B. | fusible plug |
| C. | superheater |
| D. | stop valve |
| Answer» E. | |
| 1566. |
The function of an eccentric is to provide __________ motion to the slide valve. |
| A. | reciprocating |
| B. | rotary |
| Answer» B. rotary | |
| 1567. |
Blow off cock in a boiler is used to |
| A. | control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required |
| B. | empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler |
| C. | put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit |
| D. | increase the temperature of saturated steam without raising its pressure |
| Answer» C. put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit | |
| 1568. |
The amount of water evaporated or steam produced in kg per kg of fuel burnt is termed as evaporative capacity of a boiler. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 1569. |
The clearance in the engine cylinder |
| A. | increases the mean effective pressure |
| B. | increases the workdone |
| C. | decreases the efficiency of the engine |
| D. | all of these |
| Answer» E. | |
| 1570. |
The draught (in mm of water), for maximum discharge of flue gases through the chimney, is given by (where H = Height ot the chimney in metres, and T1 = Absolute temperature of air outside the chimney in K) |
| A. | <img src="/_files/images/mechanical-engineering/steam-boilers-and-engines/291-145-1.png"> |
| B. | <img src="/_files/images/mechanical-engineering/steam-boilers-and-engines/291-145-2.png"> |
| C. | <img src="/_files/images/mechanical-engineering/steam-boilers-and-engines/291-145-3.png"> |
| D. | <img src="/_files/images/mechanical-engineering/steam-boilers-and-engines/291-145-4.png"> |
| Answer» E. | |
| 1571. |
Which of the following are boiler accessories ? |
| A. | economiser |
| B. | superheater |
| C. | both (a) and (b) |
| D. | none of these |
| Answer» D. none of these | |
| 1572. |
When the circulation of water, in a boiler, is by convection currents which are set up during the heating of water, then the boiler is known as |
| A. | internally fired boiler |
| B. | externally fired boiler |
| C. | natural circulation boiler |
| D. | forced circulation boiler |
| Answer» D. forced circulation boiler | |
| 1573. |
The amount of water evaporated in kg per kg of fuel burnt is called |
| A. | evaporative capacity of a boiler |
| B. | equivalent evaporation from and at 100 C |
| C. | boiler efficiency |
| D. | none of these |
| Answer» B. equivalent evaporation from and at 100 C | |
| 1574. |
In normalising process, the hypo-eutectiod steel is heated from 30 C to 50 C above the upper critical temperature and then cooled in still air. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 1575. |
Crystal structure of a material is, generally, examined by |
| A. | naked eye |
| B. | optical microscope |
| C. | metallurgical microscope |
| D. | X-ray techniques |
| Answer» E. | |
| 1576. |
Which of the following statement is true about brittle fracture? |
| A. | High temperature and low strain rates favour brittle fracture |
| B. | Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture |
| C. | Brittle fracture is always preceded by noise |
| D. | Cup and cone formation is characteristic for brittle materials |
| Answer» C. Brittle fracture is always preceded by noise | |
| 1577. |
The electric process of steel making is especially adopted to |
| A. | alloy and carbon tool steel |
| B. | magnet steel |
| C. | high speed tool steel |
| D. | all of these |
| Answer» E. | |
| 1578. |
Induction hardening is basically a |
| A. | carburising process |
| B. | surface hardening process |
| C. | core-hardening process |
| D. | none of these |
| Answer» C. core-hardening process | |
| 1579. |
A refrigeration system |
| A. | removes heat from a low temperature body and delivers it to a high temperature body |
| B. | removes heat from a high temperature body and delivers it to a low temperature body |
| C. | rejects energy to a low temperature body |
| D. | none of the above |
| Answer» B. removes heat from a high temperature body and delivers it to a low temperature body | |
| 1580. |
The condition of refrigerant after leaving the compressor and before entering the condenser is superheated vapour. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 1581. |
The automobile radiator is a heat exchanger of |
| A. | parallel flow type |
| B. | counter flow type |
| C. | cross flow type |
| D. | regenerator type |
| Answer» D. regenerator type | |
| 1582. |
The calorific value of petrol is about |
| A. | 36.5 - 38.5 MJ/kg |
| B. | 39.4 - 42.5 MJ/kg |
| C. | 42.7 - 43.5 MJ/kg |
| D. | 45.5 - 47 MJ/kg |
| Answer» D. 45.5 - 47 MJ/kg | |
| 1583. |
The crescent-shaped cavity on the piston head top surface is called as |
| A. | piston oil hole |
| B. | snap ring |
| C. | valve recess |
| D. | valve clearance |
| Answer» D. valve clearance | |
| 1584. |
Strain energy is the |
| A. | energy stored in a body when strained within elastic limits |
| B. | energy stored in a body when strained upto the breaking of a specimen |
| C. | maximum strain energy which can be stored in a body |
| D. | proof resilience per unit volume of a material |
| Answer» B. energy stored in a body when strained upto the breaking of a specimen | |
| 1585. |
When a rectangular beam is loaded transversely, the maximum compressive stress is developed on the |
| A. | top layer |
| B. | bottom layer |
| C. | neutral axis |
| D. | every cross-section |
| Answer» C. neutral axis | |
| 1586. |
Resilience is the |
| A. | energy stored in a body when strained within elastic limits |
| B. | energy stored in a body when strained upto the breaking of the specimen |
| C. | maximum strain energy which can be stored in a body |
| D. | none of the above |
| Answer» E. | |
| 1587. |
The stress induced in a body, when suddenly loaded, is __________ the stress induced when the same load is applied gradually. |
| A. | equal to |
| B. | one-half |
| C. | twice |
| D. | four times |
| Answer» D. four times | |
| 1588. |
If the tearing efficiency of a riveted joint is 50%, then ratio of rivet hole diameter to the pitch of rivets is |
| A. | 0.20 |
| B. | 0.30 |
| C. | 0.50 |
| D. | 0.60 |
| Answer» D. 0.60 | |
| 1589. |
The stress at which the extension of the material takes place more quickly as compared to the increase in load, is called |
| A. | elastic limit |
| B. | yield point |
| C. | ultimate point |
| D. | breaking point |
| Answer» C. ultimate point | |
| 1590. |
The power per tonne of refrigeration is |
| A. | 3.5/C.O.P. |
| B. | C.O.P/3.5 |
| C. | 3.5 x C.O.P. |
| D. | none of these |
| Answer» B. C.O.P/3.5 | |
| 1591. |
The specific humidity during cooling and dehumidification |
| A. | remains constant |
| B. | increases |
| C. | decreases |
| Answer» D. | |
| 1592. |
The process of undercooling is generally brought about by |
| A. | circulating more quantity of cooling water through the condenser |
| B. | using water colder than the main circulating water |
| C. | employing a heat exchanger |
| D. | any one of the above |
| Answer» E. | |
| 1593. |
The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called |
| A. | sub-cooling or under-cooling |
| B. | super-cooling |
| C. | normal cooling |
| D. | none of these |
| Answer» B. super-cooling | |
| 1594. |
It is desired to condition the outside air from 70% relative humidity and 45 C dry bulb temperature to 50% relative humidity and 25 C dry bulb temperature (room condition). The practical arrangement will be |
| A. | dehumidification |
| B. | cooling and humidification |
| C. | cooling and dehumidification |
| D. | dehumidification and pure sensible cooling |
| Answer» D. dehumidification and pure sensible cooling | |
| 1595. |
During heating and humidification, the final relative humidity of air |
| A. | is higher than that of the entering air |
| B. | is lower than that of the entering air |
| C. | can be lower or higher than that of the entering air |
| D. | none of the above |
| Answer» D. none of the above | |
| 1596. |
The fluids used in electrolux refrigerator are |
| A. | water and hydrogen |
| B. | ammonia and hydrogen |
| C. | ammonia, water and hydrogen |
| D. | none of these |
| Answer» D. none of these | |
| 1597. |
In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the |
| A. | expansion valve to the evaporator |
| B. | evaporator to the thermostat |
| C. | condenser to the expansion valve |
| D. | condenser to the evaporator |
| Answer» E. | |
| 1598. |
The temperature of air recorded by a thermometer, when it is not effected by the moisture present in the air, is called |
| A. | wet bulb temperature |
| B. | dry bulb temperature |
| C. | dew point temperature |
| D. | none of these |
| Answer» C. dew point temperature | |
| 1599. |
R-12 has the __________ freezing point. |
| A. | lowest |
| B. | highest |
| Answer» B. highest | |
| 1600. |
In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by |
| A. | liquid pump |
| B. | generator |
| C. | absorber and generator |
| D. | absorber, generator and liquid pump |
| Answer» E. | |