Q.1

Paint spray gun works on the principle of

  • Bernoulli's theorem.
  • Boyle's law.
  • Newton's law of viscosity.
  • none of these.
Q.2

Protection of ship hulls against sea water corrosion is done by coating with zinc because of the fact that zinc compared to iron is

  • reduced preferentially.
  • cheaper.
  • oxidised preferentially.
  • lighter.
Q.3

Which of the following pairs regarding the effect of alloying elements in steels are not matched correctly ?

  • Cobalt: It contributes to rerl hardness by hardening ferrite.
  • Molybdenum: It forms abrasion resisting particles.
  • Phosphorous: It improves machinability in free cutting steels.
  • Silicon: It reduces oxidation resistance.
Q.4

Pick out the wrong statement.

  • In a thin spherical shell under internal pressure, hoop stress is equal to the half of axial stress.
  • Thermoplastic material does not follow Hooke's law of elasticity.
  • Components under longitudinal compression is called 'struts' and the load under which strut fails is called crippling or buckling load.
  • At low temperatures (sub-zero) in pressure vessels, the ductility of metal diminishes and brittle fracture occurs while at high temperature in pressure vessels, embrittlement of material may take place.
Q.5

Young's modulus of elasticity of a material is the slope of the initial linear portion of the stress-strain curve. It decreases ap-preciablyby

  • alloying additions
  • heat treatment
  • cold work
  • increasing temperature
Q.6

The increase in hardness of metal due to its cold working is termed as the __________ hardening.

  • work
  • age
  • induction
  • flame
Q.7

The unit of gc is

Q.8

__________ is not a heat treatment process.

  • Cyaniding
  • Pakerising
  • Austempering
  • Martempering
Q.9

The term 'Value' in value engineering technique refers to the __________ cost of the product.

  • function (utility)
  • selling
  • production
  • total
Q.10

An atom bomb works on the principle of

  • nuclear fission
  • nuclear fusion
  • both the nuclear fission & fusion
  • ionisation
Q.11

__________ is not used as a material of construction in thermocouples.

  • Alumel
  • Rhodium
  • Constantan
  • Duralumin
Q.12

Melting point & boiling points of liquid oxygen are respectively - 218.8°C & - 183°C, while the same for liquid nitrogen is - 210°C & - 195.8°C respectively. The difference in melting points of liquid oxygen & liquid nitrogen is not equal to 8.8

  • °C
  • °F
  • °K
  • °R
Q.13

Eutectic reaction for iron-carbon system occurs at a temperature of __________ °C.

  • 723
  • 959
  • 1147
  • 1493
Q.14

Coarse grained steels have

  • low toughness
  • no tendency to distort
  • high density
  • very high toughness
Q.15

An ingot is hot forged to areduction in cross-section area. The percentage reduction in the volume for the above process is

  • 0
  • 60
  • 30
  • 20
Q.16

Pick out the correct statement.

  • A base is always soluble in water.
  • Hydrogen is released whenever a metal reacts with an acid.
  • Sodium hydroxide is both a base and an alkali.
  • All indicators give red solution with an acid.
Q.17

A material being tested for endurance strength is subjected to the __________ load.

  • impact
  • completely reversed
  • dynamic
  • static & dynamic
Q.18

Semi-conductors normally employ __________ bonding.

  • co-ordinate
  • ionic
  • covalant
  • metallic
Q.19

When water is sprayed on air, passing through an insulated chamber maintained at a temperature higher than the dew point of entering air but lower than its dry bulb temperature, then the air is

  • cooled and dehumified.
  • heated and humidified.
  • cooled and humidified.
  • heated and dehumidified.
Q.20

The entropy change for a spontaneous process is

  • > 0 for the system.
  • < 0 for the system.
  • > 0 for the system & the surrounding.
  • < 0 for the system & the surrounding.
Q.21

Milligram of KOH required to saponify 1 gm of oil is called its __________ number.

  • saponification
  • acid
  • precipitation
  • emulsion
Q.22

Which of the following is an example of stress corrosion ?

  • Season cracking of brass.
  • Caustic embrittlement of steel.
  • Both (a) & (b).
  • Neither (a) nor (b).
Q.23

Steel balls are manufactured by cold heading. After cold forming, they are subjected to

  • tempering
  • normalising
  • stress-relieving
  • artificial ageing
Q.24

Flywheel is provided in a machine to

  • provide structural strength to the shaft.
  • smoothen the power impluses.
  • help in quick starting of the machine.
  • none of these.
Q.25

In cold working of metal as compared to its hot working

  • cracks and blow holes are eliminated.
  • ductility and impact strength improves.
  • appreciable strain hardening is produced.
  • yield stress, hardness and fatigue strength is not at all affected.
Q.26

Volute casing of a centrifugal pump does not facilitate

  • uniform flow of fluid coming out of the impeller.
  • increase in the pump efficiency.
  • conversion of the part of the velocity head to the pressure head.
  • conversion of the part of the pressure head to velocity head.
Q.27

Unit molar solution of __________ is the best conductor of electricity.

  • sodium chloride
  • acetic acid
  • sulphuric acid
  • sucrose
Q.28

Heat transfer by radiation from a hot body will be most rapid, if its surface is __________ because of its higher emissivity.

  • white & rough
  • black & rough
  • white & polished
  • black & polished
Q.29

Ageing of steel refers to the

  • degradation of steel by corrosion.
  • failure of steel structure by overstress-ing.
  • return of sharp yield point in temper rolled low carbon sheet after a period of time.
  • decarburisation of steel by overheating.
Q.30

Pick out the wrong statement.

  • Molecules with symmetrical arrangements (.e.g. CH4 or CCl4) are nonpolar.
  • Generally, nonpolar compounds are chemically inactive, conduct electricity poorly and do not ionise.
  • Most of the hydrocarbons are nonpolar.
  • none of these.
Q.31

High endurance limit of carburised machine parts is because of the fact that carburisation

  • suppresses any stress concentration produced in the parts.
  • enhances the yield point of the material.
  • introduces a compressive layer on the surface.
  • produces a better surface finish.
Q.32

The hardness of the lathe bed material is measured by the

  • shore sceleroscope.
  • Brinnel hardness tester.
  • Vicker's hardness tester.
  • Rockwell hardness tester.
Q.33

Pick out the wrong statement about a fast breeder reactor.

  • uses molten sodium as moderator.
  • converts fertile fuel into fissile fuel.
  • requires highly enriched fuel.
  • produces more fuel than it consumes.
Q.34

FeO (s) + CO (g) = Fe (s) + CO2 (g), k =at 1173E; At equilibrium, what will be the number of moles of CO gas required to reduce one mole of FeO atK?

  • 1.0
  • 1.3
  • 2.3
  • 3.3
Q.35

Free oxygen is removed from boiler feed water, because it

  • reduces heat transfer co-efficient.
  • is corrosive.
  • causes explosion.
  • none of these.
Q.36

Out of the following, the materials having maximum magnetic permeability is

  • silicon steel (Si = 4%)
  • cast iron
  • wrought iron
  • mild steel
Q.37

Nickel is a __________ material.

  • ferromagnetic
  • semi-conductor
  • paramagnetic
  • ferroelectric
Q.38

Grey cast iron (used for making underground water pipes and manhole covers) as compared to steel has higher

  • ductility
  • impact strength
  • machinability
  • melting point
Q.39

__________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength.

  • Lancing
  • Shot peening
  • Slugging
  • Spinning
Q.40

Desert air coolers being rendered ineffective in rainy season is due to

  • low humidity
  • low temperature
  • high humidity
  • sunny weather
Q.41

A coal with high __________ content will ignite most easily.

  • hydrogen
  • oxygen
  • volatile matter
  • fixed carbon
Q.42

The routing function in a production system design is concerned with the

  • material flow optimisation through the plant.
  • machine utilisation.
  • quality control of the product.
  • manpower utilisation.
Q.43

Reduction reaction involves the

  • loss of electrons.
  • increase in oxidation number.
  • gain of electrons.
  • addition of oxygen.
Q.44

The phenomenon of strain-ageing is generally experienced with

  • cast iron.
  • low carbon steel.
  • high manganese steel.
  • high carbon steel.
Q.45

Gas carrying pipelines are best joined by

  • nuts & bolts
  • rivetting
  • welding
  • none of these
Q.46

The maximum axial compression stress during cold upsetting of a cylinderical rod of radius (r) occurs at

  • the outer edge of the rod.
  • r/3 from the centre.
  • r/2 from the centre.
  • the centre.
Q.47

When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the

  • partial pressure of water vapour is less than the total pressure.
  • humidity is < 100% & dew point temperature of air has not reached.
  • dew point temperature of air has not reached & air is not saturated fully.
  • air is fully saturated.
Q.48

Old cycle handles are coated with nickel using

  • cementation.
  • spray coating.
  • galvanising process.
  • tinning process.
Q.49

CANDU type nuclear reactor using natural uranium as fuel is the extensively used nuclear reactor because of the fact that the

  • specific fuel consumption is very low due to the use of heavy water.
  • fuel cost is much lower than that used in pressurised water or boiling water reactor.
  • heavy water is used both as coolant as well as moderator.
  • both 'b' & 'c'
Q.50

In __________ process, there is an increase in entropy with no degradation of energy.

  • isothermal expansion
  • isochoric heat addition
  • polytropic expansion
  • isobaric heat addition
0 h : 0 m : 1 s