Q.1

Atrelative humidity, the dew point temperature of moist air is

  • less than the wet bulb temperature.
  • more than the wet bulb temperature.
  • equal to the wet bulb temperature.
  • equal to the ambient temperature.
Q.2

Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog?

  • Nitrogen oxides
  • Hydrocarbons
  • both 'a' & 'b'
  • Carbon monoxide
Q.3

Cascade control is

  • the continuous adjustment of the set point index of an automatic control loop by a primary (master) controller.
  • used when changes in process conditions cause serious upsets in the controlled variable.
  • useful to control flow from temperature.
  • all 'a', 'b' & 'c'.
Q.4

Use of water as a manometric liquid suffers from the disadvantage of its

  • low vapour pressure.
  • corrosive nature.
  • high vapour pressure.
  • high boiling point.
Q.5

The excess air required for the combustion of pulverised coal is of the order of about __________ percent.

  • 5
  • 15
  • 30
  • 45
Q.6

Killed steels

  • are free from oxygen.
  • contain not even traces of sulphur & phosphorous.
  • are produced by L.D. process only.
  • contain minimum impurity level.
Q.7

According to maximum shear stress failure criterion, yielding in material occurs, when the maximum shear stress is equal to __________ times the yield stress.

  • 0.5
  • 2
  • 2
  • 3/2
Q.8

Which of the following is not a cupro-nick-el alloy ?

  • German silver
  • Monel metal
  • Muntz metal
  • None of these
Q.9

Which one is neutral in character ?

  • N2O4
  • N2O
  • N2O5
  • N2O3
Q.10

Ester is formed, when an alcohol reacts with

  • carboxylic acid
  • aldehyde
  • ketone
  • ether
Q.11

If Reynolds number is greater thanthen the

  • viscous force is larger than the inertia force.
  • inertia force is larger than the viscous force.
  • inertia force is larger than the surface tension force.
  • inertia force is larger than the gravitational force.
Q.12

The ability of a substance to assume two or more crystalline structure is called

  • isomorphism
  • polymorphism
  • amorphism
  • isomerism
Q.13

A thermally thin body is the one for which

  • Biot number is less than 0.1.
  • Gallileo number is less than 0.1.
  • Fourier number is less than 0.1.
  • Fourier number is greater than 0.1.
Q.14

A material expanding freely due to heating will develop __________ stress.

  • no
  • compressive
  • tensile
  • thermal
Q.15

Softening of hardned steel is done by its

  • normalising
  • tempering
  • annealing
  • carburising
Q.16

Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about

  • 9:1
  • 17 : 1
  • 23 : 1
  • 29 : 1
Q.17

The following thermocouple may be used for measuring temperature upto 1873°K.

  • Chromel-alumel
  • Copper-constantan
  • Platinum-platinum rhodium
  • Iron-constatan
Q.18

Thermodynamic cycle involved in the working of a thermal power plant is the __________ cycle.

  • Joule
  • Carnot
  • Rankine
  • Brayton
Q.19

Pick out the wrong statement.

  • Complete unity of command exists in a line organisation.
  • Line organisation is net suitable for expansion and growth of an industry.
  • In line and staff organisation, "line" executes and "staff directs.
  • none of these.
Q.20

Which of the following phenomenon/ phenomena is/are diffusion controlled ?

  • Dislocation climb
  • Cross-slip
  • Twinning
  • Recrystallisation
Q.21

Joule-Thomson co-efficient is the ratio of

  • pressure change to temperature change occuring during adiabatic compression of a gas.
  • pressure change to temperature change occuring during adiabatic throttling of a gas.
  • temperature change to pressure change occuring during adiabatic compression of a gas.
  • temperature change to pressure change occuring during adiabatic throttling of a gas.
Q.22

Transformer cores are normally made from

  • soft ferrites
  • high purity iron
  • grain oriented Fe-Si alloy
  • Al-Ni-Co alloy
Q.23

Electrochemical corrosion occurs

  • where the liquid electrolytes containing free ions are present.
  • only in alloys.
  • only in pure metals.
  • due to direct chemical action of metal with oxygen.
Q.24

Gage pressure within a spherical droplet of a fluid is 'p'. What will be gage pressure within a bubble of the same size & of the same fluid ?

  • p
  • 2 p
  • 0.5 p
  • 0.25 p
Q.25

Which of the following accounts for maximum loss of energy in a coal fired boiler ?

  • Incomplete combustion of fuel.
  • Outgoing flue gases.
  • Radiation heat losses.
  • Unburnt carbon in ash.
Q.26

Presence of sulphur in the fuel fired in a furnace

  • contributes to its heating value.
  • helps in electrostatic precipitation of ash from flue gases.
  • corrodes ducts & air preheater, if the flue gas temperature is low.
  • all 'a' , 'b' & 'c'.
Q.27

The type of pump used for lifting large quantity of sewage is a __________ pump.

  • gear
  • centrifugal
  • reciprocating
  • plunger
Q.28

The main function of the deaerator used in the thermal power plant is to

  • throttle down the steam pressure.
  • enhance feed water temperature.
  • remove dissolved gases from feed-water.
  • remove non-condensable gases from condenser.
Q.29

Air refrigeration cycle is used in the air crafts, because of

  • low temperature encountered at high altitude.
  • its high heat transfer rate.
  • its low unit weight per ton of refrigeration.
  • its higher co-efficient of performance (COP).
Q.30

A machine having assumed life ofyears is purchased for Rs 32000/-. Its scrap value at the end of its life is Rs 8000/-. If the depreciation is calculated by diminishing balance method, then percentage reduction in its value at the end of first year is __________ percent.

  • 6.7
  • 7.6
  • 10.3
  • 15.2
Q.31

Which of the following alloying elements is present in maximum percentage in high speed steel.

  • Molybdenum
  • Chromium
  • Tungsten
  • Vanadium
Q.32

Fibre reinforced plastic (FRP) are

  • made of glass fibre and thermoplastic resins.
  • anisotropic.
  • made of thermosetting resin and glass fibre.
  • both 'b' & 'c'
Q.33

Closeness of packing is maximum in case of __________ crystal lattice.

  • face centred
  • simple cubic
  • body centred
  • none of these
Q.34

__________ of austenite decreases the hardenability in steel.

  • Fine grains
  • Coarse grains
  • Homogeneity
  • Dissolved elements (except cobalt)
Q.35

Expansion device used in a window air-conditioner is a/an

  • automatic expansion valve.
  • thermostatic expansion valve.
  • float valve.
  • capillary tube.
Q.36

__________ test is the appropriate test to determine whether a material is ductile or brittle.

  • Impact
  • Cupping
  • Hardness
  • Tensile
Q.37

The ability of tool steel to resist softening at high temperatures is termed as __________ hardness.

  • red
  • extended
  • super
  • extreme
Q.38

While the bin cards are used in the effective stores management, the queing theory is associated with the __________ time.

  • waiting
  • idle
  • inspection
  • tool replacement
Q.39

Boiling temperature of carbon dioxide at atmospheric pressure is __________ °C.

  • -30.5
  • -78.5
  • -183.5
  • -10.5
Q.40

Which of the following metals is not subjected to electrolytic refinning/purification?

  • Copper
  • Zinc
  • Tin
  • Aluminium
Q.41

Lubricants can be used to

  • transmit power hydraulically.
  • form a seal in compressors.
  • remove contaminants by flushing and to insulate transformers, switchgears etc.
  • all (a), (b) & (c).
Q.42

Which of the following is termed as the boiler mounting ?

  • Feed water pump
  • Steam superheater
  • Blow off cock
  • Economiser
Q.43

Failure of a material is attributed to __________ if it fails below its yield point.

  • impact loading
  • fatigue
  • creep
  • straining
Q.44

More thantons refrigeration capacity plants are usually of __________ type.

  • vapour compression
  • vapour absorption
  • air refrigeration
  • none of these
Q.45

A jig is used while __________ a hole.

  • boring
  • counter boring
  • drilling
  • enlarging
Q.46

Main constituent of bone ash is

  • ammonium phosphate.
  • calcium phosphate.
  • animal charcoal.
  • ammonium sulphate.
Q.47

Improvement in mechanical properties of metals in its hot working is due to the grains

  • recrystallisation
  • refinement
  • growth
  • recovery
Q.48

Diameter of the rivet to be provided on amm. thick boiler plate will be __________ mm.

  • 10
  • 20
  • 30
  • 40
Q.49

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

  • 597
  • 959
  • 1147
  • 1493
Q.50

The most important function of a washer is to provide bearing area and washers are normally specified by their hole diameters. The diameter of washer as compared to the nut is

  • more
  • less
  • same
  • more but less than the diameter of bolt
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