ISRO Technician-B Fitter Question Paper - 2016 (Set-3)

ISRO Technician-B Fitter Question Paper - 2016 (Set-3)

1) The pair of physical quantities having the same unit is

A) Thrust and weight A) Thrust and pressure B) Force and pressure C) Weight and pressure

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2) A wheel of diameter 10 cm describes 600 revolutions per minute. The angular velocity of the wheel is

A) 20 Pie rad/s A) 40 Pie rad/s B) 2 Pie rad/s C) 10 Pie rad/s

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3) The designation of sheet of size 594x841 is

A) A1 A) A4 B) A3 C) A2

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4) Which of the following is the lightest pencil?

A) 2B A) 1B B) HB C) H

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5) the neutral axis of the cross-section of a beam is that axis at which the bending stress is

A) Zero A) minimum B) maximum C) infinity

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6) A steel bar of 6mm is heated from 25 degree Centigrade to 60 degree centigrade and it is free to expand. The bar will induce

A) no stress A) shear stress B) tensile stress C) compressive stress

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7) The stress strain relationship of a Netwonain fluid is

A) linear A) parabolic B) Hyperbolic C) billinear

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8) Francis turbine is best suited for

A) medium head application from 24 to 180 mm A) low head installation up to 30 m B) high head installation above 180 m C) all types of heads

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9) Tempering of quenched martensite steel is necessary to improve

A) Hardness A) Corrosion resistance B) Ductility C) Strength

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10) Which of the following welding techniques require a vaccum environment

A) Ultrasonic welding A) Laser beam B) Plasma arc C) Electron Beam

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11) Positive displacement flow meters are _____ flow meters.

A) Variable area flow A) Differential pressure flow B) Quantity flow C) None of these

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12) Reception of the cutting tool in shaping machines is accomplished by

A) Rack pinion mechanism A) Crank and connecting rod mechanism B) Cam and cam follower mechanism C) Oscillating lever mechanism

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13) Allowance provided to vertical walls of patterns for easy withdrawl is called

A) Shrinkage allowance A) Draft allowance B) Distortion / Camber allowance C) Rapping allowance

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14) In a milling machine, cutting tool is held in position by

A) Chuck A) Spindle B) Arbor C) Tail stock

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15) The Fit on a hole shaft system is specified as G7g6. The type of fit is

A) Interference A) Transition B) Clearance C) Cannon be determined as basic size is not given

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16) A composite shaft consisting of two stepped portions having spring constants k1 and k2 is held between two rigid supports at the ends. Its equivalent spring constant is

A) (k1+k2)/2 A) (k1+k2)/(k1k2) B) (k1k2)/(k1+k2) C) (k1+k2)

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17) Lame's theory is associated with

A) Thin cylindrical shells A) Thick cylindrical shells B) Direct and bending stresses C) None of these

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18) The mach number of the supersonic flow is between

A) 0.8 and 1.2 A) 1.2 and 5 B) 5 and 10 C) None of these

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19) Which one of the following is trapezoidal thread?

A) Acme A) Square B) buttress C) All of the above

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20) Rolling friction is

A) Lesser than sliding friction A) More than sliding friction B) Equal to sliding friction C) Equal to kinetic friction

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21) Which of the following statements are true
1. Stress and Pressure are measured in units of Load/Area
2. Intensity of Pressure at a point is same in all directions whereas Stress depends on load and direction.
3. Pressure and Stress are scalar.

A) 1 and 3 only A) 1, 2, 3 B) 1 and 2 only C) 2 and 3 only

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22) Poisson's ratio of which of t he following materials is neary zero.

A) Rubber A) Aluminium B) Cork C) Steel

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23) The stress developeed in a thin spherical shell (thickness t and diameter D) subjected to an internal pressure P is:

A) (PD/4t) A) (PD/2t) B) (PD/t) C) (PD/8t)

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24) Endurance limit depends on
1. Material
2. Size
3. Surface finish
4. Type of loading

A) 1, 2, 3, 4 A) 1, 3, 4 B) 1 and 4 only C) 1, 2, 3

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25) Shot peening increases the fatigue life of springs because it results in

A) Alteration of stiffness of spring A) Residual compression at surface B) Changes in surface composition C) Abration in surface leads to smooth surface.

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26) Which of the following is applied to brittle materials

A) maximum principal stress theory A) maximum principal strain theory B) maximum strain energy theory C) maximum shear stress theory

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27) Which of the following constituents of steel is softest

A) Ferrite A) Ledeburite B) Pearlite C) Austenite

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28) Which bond gives the softest bond?

A) silicate bond A) shellac bond B) vitrified bond C) all of equal length

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29) Ratio of inertia force to surface tension is known as

A) Weber's number A) Mach number B) Froude number C) Euler number

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30) When a Venturimeter is used in an inclined position, its reading will show variation with

A) Fluid velocity A) Fluid density B) Remains same C) Decreases

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31) If dry steam is heated above saturation temperature, then it is called

A) sensible heat A) superheating B) super saturated steam C) entropy

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32) The cycle generally used for gas turbine is

A) Otto cycle A) Dual cycle B) Diesel cycle C) Brayton cycle

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33) The critical pressure of a liquid is

A) The pressure above which a liquid will explode A) The pressure above which a liquid will always convert into a vapour B) The pressure above which a liquid will remain a liquid C) The pressure below which a liquid will always be a vapour form.

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34) For refrigerating system work done per Kg of air is 30 Kcal and heat extracted per Kg of air is 45 Kcal. Amount of refrigerant used is 10 Kg. The coefficient of performance of system is

A) 6.52 A) 1.5 B) 10.56 C) 0.67

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35) Cold worked components are generally subjected to

A) Normalising A) Tempering B) Hardening C) Annealing

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36) The concept of Just in Timem focuses on

A) eliminating waste A) reduce machining time B) reduce labour expenses C) man power development

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37) The stress concentration factor is

A) It is the ratio of maximum stress to the nominal stress A) It is the ratio of nominal stress to the maximum stress B) It is the ratio of maximum stress to the endurance limit C) It is the ratio of nominal stress to the endurance limit

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38) Arrange the following in steps followed in Powder metallurgy
1. Metal powdering
2. Blending
3. Compacting
4. Sintering

A) 1, 2, 3, 4 A) 1, 2, 4, 3 B) 1, 4, 2, 3 C) 1, 3, 2, 4

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39) If a room is to be maintained at 200K while surroundings are 300K by a refrigeration system using reversed Carnot cycle, Coefficient of Performance (COP) will be

A) 2 A) 3 B) 0.5 C) 5

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40) A differential manometer connected at two points shows a difference in mercury level as 10cm. The difference of pressure at the two points are: (Assume pipe is horizontal, Specific gravity of mercury is 13.6 and fluid in pipe is 0.9, g=10m/square seconds)

A) 127 N/square meter A) 12700 N/square meter B) 12700 N/square millimeter C) None of the above

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41) A steel rod of 1 m length has to transmit a force of 15 kN without stretching more than 1mm. E of steel is 200Gpa. Minimum cross sectional area required is

A) 150 square millimeter A) 75 square meter B) 150 square meter C) 75 square millimeter

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42) A thin cylindrical shell of diameter (d), length (l), and thickness (t) is subjected to an internal pressure (p). The ratio of the longitudinal strain to hoop strain is

A) (m-2)/(2m-1) A) (2m-1)/(m-2) B) (m-2)/(2m+1) C) (m+2)/(2m+2)

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43) Rankine's constant for a mild steel column with both ends hinged is

A) (1/750) A) (1/1600) B) (1/7500) C) None of these

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44) The material used in the manufacture of thermistors are

A) Oxides of manganese and cobalt A) Oxides of iron and zinc B) Carbides of silicon and germanium C) All of these

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45) A metal strip is to be rolled from initial wrought thickness of 3.5 mm to a final rolled thickness of 2.5 mm in a single pass rolling mill having rolls of 250 mm diameter. The strip is 450 mm wide. The average co-efficient of friction in the roll gap is 0.

A) 320 KN A) 420 KN B) 820.6 KN C) 165 KN

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46) Find the melting efficiency for an arc welding process which has a potential of 15 volts and current rating of 250 ampares. Weld has travel speed of 6 mm/s for a cross sectional area of 18 square millimeter. Heat transfer efficiency is 0.80 and heat requir

A) 45.00% A) 43.20% B) 47.20% C) 44.50%

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47) During expansion in steam turbine, entropy

A) increases exponentially A) decrease exponentially B) increase linearly C) none of these

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48) If the strain energy absorbed in a cantilever beam in bending under its own weight is 'K' times greater than the strain energy absorbed in an identical simply supported beam in bending under its own weight, then the magnitude of 'K' is

A) 2 A) 4 B) 6 C) 8

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49) In a 5 KW cooling capacity refrigeration system operating on a simple vapour compression cycle, the refrigerant enters the evaporator with an enthalpy of 75 KJ/kg and leaves with an enthalpy of 182 KJ/kg. The enthalpy of the refrigerant after compression i

A) 4, 1.24 KW A) 4.5, 1.50 KW B) 4.5, 1.40 KW C) 4, 1.40 KW

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50) A centrifugal pump running at 500 rpm and at its maximum efficiency is delivering a head of 30 m at a flow rate of 60 litres/min. If the rpm is changed to 1000, then the head H in meters and flow rate Q in liters/min at maximum efficiency are estimated to

A) H = 60, Q=120 A) H = 120, Q= 120 B) H = 60, Q = 480 C) H = 120, Q = 30

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51) For IT01 grade, tolerance is expressed as

A) 0.3 + 0.02D A) 0.5 + 0.12D B) 0.3 + 0.008D C) 0.8 + 0.02D

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52) The index of performance for a machining operation is a function of
MRR - Material Removal Rate, TWR - Tool Wear Rate

A) (MRR)/(TWR) A) (TWR)/(MRR) B) (MRR-TWR)/(MRR) C) (TWR-MRR)/(TWR)

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53) Degrees of freedom for a robot is

A) 10 A) 6 B) 3 C) 5

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54) Shaving of metals is done in-order to

A) remove burr and improve accuracy A) remove excess metal B) remove scrap C) all of the above

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55) When holes are required to be machined in several faces in small work piece, the jig used is

A) box jig A) latch jig B) pot jig C) post jig

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56) Major draw back of EDM process is that

A) it has very high capital cost A) power consumption is very high B) wear takes place at electrode at each spark C) material removal rate is less

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57) Routing assists engineers in deciding in advance

A) the flow of material in the plant A) the methods of proper utilization of man power B) the methods of proper utilization of machines C) the layout of factory facilitates

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58) In a 2D CAD software, clockwise circular arc of radius 5, specified from P1(15,10) to P2(10, 15) will have its center at

A) (10, 10) A) (15, 10) B) (15, 15) C) (10, 15)

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59) "Equal volumes of all gases at the same temperature and pressure have the same number of molecules" is

A) Boyles law A) Charles law B) Avagadros law C) Daltons law

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60) Which of the following statements are true w.r.t Hydrostatic forces on surfaces.
1. Total pressure is the force exerted by a static fluid on a surface either plane or curved. This force always acts normal to the surface.
2. In a vertical plane surface subm

A) 1, 2 and 3 A) 1 only B) 1 & 3 only C) 1 & 2 only

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61) A bag contains 5 red, 4 blue and 3 green balls. Find the probability of randomly drawing a red ball?