Q.1

Galvanic corrosion can not be prevented by

  • cathodic protection.
  • anodic protection.
  • usage of largest possible anodic area.
  • any one of these.
Q.2

Carnot cycle is also termed as the constant __________ cycle in thermodynamics.

  • entropy
  • pressure
  • volume
  • heat
Q.3

Which of the following fastening devices has a head at one end and a nut fitted to the other ?

  • Bolt
  • Stud
  • Top bolt
  • None of these
Q.4

Sudden fall of atmospheric pressure by a large amount is an indication of the

  • rain
  • cold wave
  • storm
  • fair weather
Q.5

Consider the equilibrium A(g) + B(g) = AB(g). When the partial pressure of A is 10-2 atm, the partial pressure of B is 10-3 atm and the partial pressure of AB is 1 atm, the equilibrium constant 'K' is

  • 10 atm-1
  • 105 atm-1
  • 10 (dimensionless)
  • 105 (dimensionless)
Q.6

Air-petrol ratio for maximum power generation in spark ignition engine is about

  • 6:1
  • 12 : 1
  • 18 : 1
  • 24 : 1
Q.7

Identify the correct statement.

  • Sphlerite is zinc oxide.
  • The first law of the thermodynamics is stated as δE = δQ - δW.
  • Lead can be produced in a blast furnace.
  • T. ferrooxidans is a fungus that can be used for leaching chalcopyrite.
Q.8

Dowtherm is a

  • high temperature heating medium (a petroleum product).
  • product of coal tar distillation.
  • very heat sensitive material.
  • none of these.
Q.9

Biological shield in a nuclear reactor is generally provided to protect against the

  • α-rays
  • β-rays
  • gamma rays & neutrons
  • electrons
Q.10

In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is

  • more
  • less
  • equal
  • much more
Q.11

Temper brittleness of a material can be fairly detected by the __________ test.

  • fatigue
  • notched bar impact
  • tensile
  • hardness
Q.12

When the wavelength of incident X-rays increases, the angle of diffraction

  • decreases.
  • increases.
  • remains constant.
  • shows no systematic variation.
Q.13

Fire in fuel gas pipelines is extinguished most effectively by

  • spraying water.
  • blanketting the area with nitrogen atmosphere.
  • fire fighting foam.
  • none of these.
Q.14

Thermistors are used in __________ devices.

  • voltage measuring
  • temperature measuring
  • temperature compensating
  • both (b) & (c)
Q.15

Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner ?

  • Output & fineness
  • Velocity
  • Both (a) & (b)
  • None of these
Q.16

Normalising does not __________ of a metal.

  • improve machinability & tensile strength
  • remove internal stresses
  • refine the structure
  • remove strains caused by cold working
Q.17

Which of the following is the most suitable abrasive for grinding high tensile strength materials ?

  • Silicon carbide
  • Corundum
  • Aluminium oxide
  • Boron carbide
Q.18

Broaching tools are usually made of

  • cermets
  • high speed steel
  • tungsten carbide
  • stellite
Q.19

Which of the following hardness tests does not measure the indentation hardness of metals and alloys ?

  • Vicker's hardness test.
  • Shore sceleroscope test.
  • Brinell hardness test.
  • Rockwell hardness test.
Q.20

The ratio of the shear stress to the principal stress on a principal plane is

  • 0
  • 1
  • 1/2
  • 1/3
Q.21

The following type of bonding is strongly directional in solids.

  • Vander Waal's
  • Ionic
  • Metallic
  • Covalant
Q.22

In troposphere (the weather domain), the temperature 't' at height 'h' above the sea level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)

  • t = 15 - 0.0065 h
  • t = 15 + 0.0065 h
  • t = 0.0035 h - 15
  • t = 15 - 0.0035 h
Q.23

Which one of the following is incombustible ?

  • H2
  • CCl4
  • C2H2
  • S
Q.24

Fog is an example of colloidal system of

  • solid dispersed in gas.
  • solid dispersed in liquid.
  • liquid dispersed in gas.
  • gas dispersed in liquid.
Q.25

Chromium molybdenum steel can not be welded using __________ welding.

  • thermit
  • electrical resistance
  • oxy-acetylene
  • any of these
Q.26

__________ circuit is most commonly used to measure strain with the help of a strain gauge.

  • Ballast
  • Voltage balancing potentiometric
  • Simple current sensitive
  • none of these
Q.27

A high pressure boiler generates steam at a pressure greater than __________ kg/cm2 .

  • 10
  • 30
  • 50
  • 80
Q.28

Evaporative cooling process employs a combination of cooling and humidification in which the

  • sensible heat is added.
  • sensible heat is removed and the latent heat is added.
  • latent heat is removed.
  • sensible heat is added and latent heat is removed.
Q.29

In chemical dehumidification process

  • wet bulb temperature increases.
  • dry bulb temperature remains constant.
  • dew point temperature increases.
  • dry bulb temperature increases.
Q.30

The softness or hardness of a grinding wheel depends upon the type & amount of bonding material used. For general purpose cutter grinding __________ grinding wheel is normally used.

  • hard
  • soft
  • silicon carbide
  • aluminium oxide
Q.31

Speisses is a mixture of the following:

  • Arsenides of heavy metals.
  • Antimonides of heavy metals.
  • Arsenides & antimonides of heavy metals.
  • Iron, cobalt and nickel.
Q.32

Which of the following is normally not found in both the S.I. (petrol) & C.I. (diesel) engines ?

  • Air filter
  • Fuel injector
  • Exhaust silencer
  • Battery
Q.33

__________ is a special constituent of chlorophyll without which photosynthesis is not possible.

  • Calcium
  • Nitrogen
  • Phosphorous
  • Hydrogen
Q.34

Which of the following is not an explosive ?

  • TNT
  • CMC
  • RDX
  • Lead azide
Q.35

Secondary hardening in steels arises out of the

  • precipitation of fine alloy carbides at high temperatures.
  • refinement of ferrite grain size by working.
  • decomposition of retained austenite upon heat treatment.
  • precipitation of complex inter-metal-lics upon heat treatment.
Q.36

Tin based white metals are used, where bearings are subjected to

  • high pressure & load.
  • low pressure & load.
  • high temperature.
  • large surface wear.
Q.37

Auto collimator is used to check

  • flatness
  • angle
  • rotor balancing
  • roughness
Q.38

__________ is used as a material of construction for the blade of power saw.

  • Wrought iron
  • Stainless steel
  • Mild steel
  • High speed steel
Q.39

During decarburising of a plain carbon steel, the thickness of ferrite layer growth is proportional to

  • time
  • square root of time
  • square of time
  • cube of time
Q.40

Maxwell's thermodynamic relations applies to the

  • chemical systems in equilibrium.
  • mechanical systems in equilibrium.
  • irreversible thermodynamic processes.
  • reversible thermodynamic processes.
Q.41

Drills are usually made of

  • cermets
  • high speed steel
  • alloy steel
  • tungsten carbide
Q.42

Friction factor for fluid flow in pipe does not depend upon the

  • pipe length.
  • pipe roughness.
  • fluid density & viscosity.
  • mass flow rate of fluid.
Q.43

Tumbling is the process of improving the __________ of the materials/parts.

  • surface finish
  • fatigue limit
  • creep limit
  • surface cleanlineses
Q.44

All of the following alloying elements of steel increases hardness but sacrifice ductility, except

  • nickel
  • vanadium
  • molybdenum
  • chromium
Q.45

The __________ of a double acting reciprocating pump as compared to the single acting pump will be almost double.

  • flow output
  • head developed
  • overall efficiency
  • weight
0 h : 0 m : 1 s