Q.1

The boiling & freezing points on a newly defined temperature scale in degree 'D' are 400°D & 100°D respectively. The temperature reading corresponding to 60°C on this new temperature scale will be equal to __________ °D.

  • 140
  • 180
  • 240
  • 280
Q.2

Which of the following is not used as a fuel in rocket propellaht ?

  • Liquid hydrogen
  • Liquid oxygen
  • Liquid hydrazine
  • Kerosene oil
Q.3

Unit of viscosity in CGS system is

  • gm .cm-1 sec-1
  • gm . cm2 . sec-2
  • gm .cm-2, sec-1
  • gm . cm . sec-1
Q.4

Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are

  • cobalt, chromium & tungsten,
  • cobalt, chromium & nickel.
  • molybdenun, tungsten & chromium.
  • cobalt, zirconium & molybdenum.
Q.5

Which of the following is the terminology used for the temperature at which the phase changes occur in a metal ?

  • Critical temperature.
  • Recrystallisation temperature.
  • Phase transformation temperature.
  • Transition temperature.
Q.6

Laser is a device to produce

  • gamma rays.
  • microwaves.
  • a beam of white light.
  • a beam of coherent light.
Q.7

LASER

  • stands for Light Amplification by Stimulated Emission of Radiation.
  • has the same intensity as visible light.
  • can't be used for cutting metals.
  • none of these.
Q.8

Which of the following approaches the ideal gas behaviour most closely ?

  • Wet steam
  • Saturated steam
  • Superheated steam
  • Saturated water
Q.9

Function of blow down valve in a boiler is to

  • maintain the drum level.
  • keep the drum pressure constant.
  • drain out the sludge from the drum.
  • empty the boiler during shutdown.
Q.10

The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at __________ percent relative humidity.

  • 0
  • 100
  • 50
  • none of these
Q.11

Measurement of the area of the indented surface is not involved in the __________ hardhes testing method.

  • Vicker's
  • Rockwell
  • Knoop
  • Brinell
Q.12

The most serious manufacturing defect from fracture toughness point of view is

  • surface roughness
  • pores
  • spherical inclusion
  • crack
Q.13

Presence of nickel & chromium in steel does not raise its

  • elastic limit
  • machining properties
  • ductility
  • resilience
Q.14

Hot extrusion process is not used for making

  • cast iron pipe for domestic water supply.
  • aluminium curtain rods.
  • stainless steel tubes used in furnitures.
  • any of these.
Q.15

Hydrogen in liquid steels is dissolved

  • as tiny gas bubbles.
  • in the atomic form.
  • in the ionic form.
  • in the molecular form.
Q.16

The following is a typical anionic collector used in flotation.

  • Ethyl dixanthogen.
  • Trimethyl cetyl ammonium bromide.
  • Potassium ethyl xanthate.
  • lAuryl amine hydrochloride.
Q.17

Classification of metal forming processes into hot and cold working is based on the following parameters.

  • Stacking fault energy.
  • Recrystallisation temperature.
  • Solidus temperature.
  • Transformation temperature.
Q.18

Property of a material to resist a tensile force without giving away is a measure of its

  • stiffness
  • toughness
  • resilience
  • tenacity
Q.19

Cast iron has the unique property of high

  • ductility
  • damping characteristics
  • hardness
  • malleability
Q.20

Hypo (sodium thiosulphate) because of its complex forming behaviour is used in photography to remove undecomposed silver bromide as a soluble complex for __________ of the picture.

  • printing
  • developing
  • colour
  • fixation
Q.21

Shaft/rotor speed is most accurately measured by a

  • frequency counter.
  • tachometer.
  • strobometer.
  • speedometer.
Q.22

In electrical resistance welding, distortion results from the use of improper

  • clamping methods
  • electrodes
  • current
  • filler material
Q.23

The order of a chemical reaction

  • can be determined only experimentally
  • can be determined from the stoichiometry of the reaction.
  • can not be zero.
  • can be fractional.
Q.24

Lead is poured into the joint between two- __________ pipes.

  • mild steel
  • concrete
  • cast iron
  • asbestos cement
Q.25

Which of the following is the most suitable material of construction for the condenser tubes, where the cooling medium is brine (salty water)?

  • Aluminium
  • Copper
  • Titanium
  • Stainless steel
Q.26

Puddling process is used for converting pig iron into

  • cast iron
  • wrought iron
  • mild steel
  • semi-steel
Q.27

Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron.

  • manganese
  • phosphorous
  • magnesium
  • chromium
Q.28

__________ forces do not act in case of fluids.

  • Vibratory
  • Centrifugal
  • Elastic
  • Tensile
Q.29

Which of the following is not the function of a volute casing provided in a centrifugal pump ?

  • To reduce the head loss in discharge.
  • To increase the pump efficiency.
  • To collect liquid from the periphery of the impeller and to transmit it to the delivery pipe at constant velocity.
  • To increase the pump discharge rate.
Q.30

Insulation of liquid surface can be achieved by __________ on top of its surface.

  • floating hollow polypropylene spheres
  • spraying alumina powder
  • putting cement
  • none of these
Q.31

The process of removal of scale formed during hot rolling of steel is termed as

  • descaling
  • shot blasting
  • pickling
  • skimming
Q.32

Salvage value is the most flexible criteria for analysing a financial investment. 'Salvaging' means

  • disposing off a machine/property on as is where is basis.
  • disposing off machine/property, which is no longer useful in the present scenerio.
  • mortgaging the obsolete machine/property.
  • writing off the obsolete machine/ property.
Q.33

Leakage in a cooking gas cylinder is detected by

  • radio-isotopes.
  • pouring soap solution on the surface and locating the gas bubbles.
  • halide torch.
  • pungent smell of mercaptans present in the gas.
Q.34

Addition of __________ to steel does not help in improving its machinability.

  • sulphur
  • silicon
  • lead
  • phosphorous
Q.35

Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of __________ will facilitate the most accurate measurement of the temperature.

  • copper
  • steel
  • aluminium
  • brass
Q.36

__________ test determines the yield strength, Young's modulus of elasticity, percentage reduction in area & percentage elongation of a material.

  • Tensile
  • Fatigue
  • Impact
  • None of these
Q.37

The conventional mechnical transducer, which converts pressure signal to displacement signal is

  • spring
  • manometer
  • strain gauge
  • none of these
Q.38

A hot short metal is

  • hard when hot.
  • brittle when cold.
  • brittle when hot.
  • brittle under all conditions.
Q.39

Pick out the wrong statement.

  • Lead can creep under its own weight at room temperature.
  • The electrical conductivity of gold is considerably reduced by alloying additions due to the decrease in electron movement.
  • Recrystallisation temperature decreases with decrease in strain in a cold worked metal.
  • With increase in temperature, the electrical conductivity of intrinsic semi-conductor will increase.
Q.40

Metallic surveying tapes are made of __________ which has a low co-efficient of expansion & enough strength.

  • invar
  • hastealloy
  • duralumin
  • monel metal
Q.41

The concentration of (H+) ions is 4 x 10-5 in a solution. Then pH of the solution will be (Given log 4 = 0.6 )

  • 4.4
  • 5.6
  • 8.4
  • 2.4
Q.42

Heat flow across a hollow sphere of inner radius 'r1' and outer radius 'r2' is directly proportional to

Q.43

Gas turbine normally employs a constant __________ cycle.

  • pressure
  • temperature
  • volume
  • none of these
Q.44

Which of the following is an ore dressing operation ?

  • Classification
  • Smelting
  • Roasting
  • None of these
Q.45

Fluorine is not a constituent of

  • freon
  • chloroform
  • teflon
  • fluorocarbons
Q.46

The malleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the maximum malleability ?

  • Lead
  • Copper
  • Aluminium
  • Wrought iron
Q.47

Addition of __________ in steel can help in increasing the depth of hardness.

  • nickel
  • chromium
  • vanadium
  • tungsten
Q.48

Minimum thermal efficiency of a steam boiler may be around __________ percent

  • 25
  • 45
  • 65
  • 20
Q.49

Which of the following is not a natural abrasive ?

  • Silicon carbide
  • Quartz
  • Corundum
  • Emery
Q.50

The pressure outside a bubble/droplet of liquid is __________ the internal pressure.

  • greater than
  • less than
  • equal to
  • unpredictable ; depends on the bubble size
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