ISRO Scientist or Engineer Mechanical Dec 2017

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 1

Report

The most applicable failure theory for metals like Aluminium is

A

Maximum principal stress theory

B

Maximum principal strain theory

C

Total strain energy theory

D

Maximum distortion energy theory

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 2

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Which one of the following is FALSE?

A

Number of Taps generally used for hand tappingis 3

B

Piispanen’s model in machiningis usedto estimate shear strain

C

Chip hammering during machiningis due to improperchip control

D

Cemented carbide tools are generally poor in compression

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 3

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A statistical process control chart which shows the number of defects found in a subgroup of fixed size is

A

C-chart

B

R-chart

C

Control chert

D

Gantt chart

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 4

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Complex irregular three dimensional surfaces can be located using the following method

A

Sighting

B

Nesting

C

Integral locators

D

Buttons

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 5

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The force in member BC of steel truss structure shown in figure below is (Cross section of each member is A, Length of each member is ‘l')

A

P1 + 2P2

B

2P1 + P2

C

2 * (P1 + P2)

D

(P1 + P2)/2

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 6

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Buckling loads (Pi) of 4 columns of equal length and cross section, but with different end conditions are shown below. Which ofthe following is TRUE?

A

$$p_1 < p_2 < p_3 < p_4$$

B

$$p_3 < p_1 < p_4 < p_2$$

C

$$p_1 < p_4 < p_2 < p_3$$

D

$$p_3 < p_4 < p_1 < p_2$$

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 7

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The bar AB weighs 10 kg per meter and is supported by cable AC and a pin at B. Reaction at B is ( take g = 10 m/s$$^2$$)

A

200 N, vertical

B

200 N, at $$30^\circ$$ to horizontal

C

100 N vertical

D

100 N at $$60^\circ$$ to horizontal

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 8

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Arrange the metals Aluminium, Copper, Iron & Silver in increasing order of thermal conductivity

A

Iron, Aluminium, Copper, Silver

B

Aluminium, Iron, Copper, Silver

C

Copper, Iron, Silver, Aluminium

D

Iron, Copper, Aluminium, Silver

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 9

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Modulus of resilience for the below material is

A

200 kN/m$$^2$$

B

100 kN/m$$^2$$

C

606.25 kN/m$$^2$$

D

12.29 MN/m$$^2$$

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 10

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Which of the following is FALSE?

A

Heat flow by conduction is directly proportional to the area and temperature gradient

B

Heat flow by convection is directly proportional to the area and temperature difference

C

Heat flow by radiation is directly proportional to the cube of absolute temperature of the radiating body

D

Emissivity of perfect black body is unity

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 11

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Two dimensionally equal blocks made of material M1 and M2 are placed on flat horizontal surface as shown in figure below. Young’s modulus of the materials are El & E2 resp. A
uniform pressure ‘p’ is applied over the blocks through a thick plate (AB) symmetrically placed over the blocks. For E1 > E2, consider the statements below.

(p) Stress in both blocks are same
(q) Strain in both blocks are same
(r) Plate AB tilts and point B moves downward
(s) Plate AB tilts and point A moves downward
Which of the above sentencesare correct?

A

p, q & r

B

q & r

C

p & s

D

p & r

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 12

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In tolerancing of a part, unless otherwise specified, individual features of size must

A

not violate size limits of MMCat anycross section

B

not violate an envelope of perfect form at LMC

C

not violate an envelopeof perfect form at MMC

D

none of these

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 13

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A horizontal bar AB assumedto be rigid, is supported by two wires CE & DF, having lengths L and 2L respectively and pinned at A. If each wire hascross sectional area A, the tensile stress $$\sigma_1$$ and $$\sigma_2$$ in wires CE and DF are respectively,

A

$$\frac{3P}{5A}$$ and $$\frac{6P}{5A}$$

B

$$\frac{2P}{5A}$$ and $$\frac{4P}{5A}$$

C

$$\frac{3P}{A}$$ and $$\frac{6P}{A}$$

D

$$\frac{P}{A}$$ each

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 14

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A 3 m long steel shaft has to transmit 7.5 kW at 3600 rpm. Required shaft diameter is given by (Take allowable shear stress = 100 N/mm$$^2$$, $$\pi^2 = 10$$)?

A

10 mm

B

7.5 mm

C

25 mm

D

12.5 mm

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 15

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For thin cylindrical shell structures loaded in compression, the design is based on

A

Yield strength of material

B

Ultimate strength of material

C

Buckling strength of the structure

D

Shear strength of the structure

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 16

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Thefrictional shear stress ($$\tau$$) in metal forming is expressed as
where ‘m’is the friction shear factor and ‘$$\overline{\sigma}$$’ is the flow stress

A

$$\frac{m \overline{\sigma}}{\sqrt{3}}$$

B

$$\frac{\overline{\sigma}}{\sqrt{3m}}$$

C

$$\frac{\overline{\sigma}}{m \sqrt{3}}$$

D

$$\frac{\sqrt{3}}{m}\overline{\sigma}$$

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 17

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Governing differential equation for small deflections of elastic beamsis given by

A

$$\frac{\partial^2 y}{\partial x^2} = \frac{M}{EI}$$

B

$$EI\frac{\partial^3 y}{\partial x^3} = V(x)$$

C

$$EI\frac{\partial^4 y}{\partial x^4} = q(x)$$

D

All the above

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ISRO Scientist or Engineer Mechanical Dec 2017 - Question 18

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A point moves accordingto the relation $$x = 8t^2 \cos(\omega t), y = -4t^3 \sin(\omega t)$$, where x and y are in meters, and t in seconds. If angular velocity $$\omega = 8 \pi$$ rad/sec, velocity vector of the point at t = 0.5 sec is given by

A

$$8 + j4 \pi$$

B

$$6 + j20 \pi$$

C

$$8 - j4 \pi$$

D

$$-20 \pi - j6$$

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 19

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A 10 mm thick plate-1 is welded to another plate-2 (10 mm thk) using fillet weld of thickness 10 mm,on two sides of plate-1 as shown in figure. Plate-1 projects outside plate-2 by 85 mm. An end load of 1 KN acts on plate-1. The primary shear stress produced in the weld throat is

A

173 N/mm$$^2$$

B

2.4 N/mm$$^2$$

C

85 N/mm$$^2$$

D

None of these

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 20

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Isochoric changesin ideal gas are characterized by

A

$$\frac{V}{T} = Const$$

B

$$PV = Const$$

C

$$\frac{P}{T} = Const$$

D

None of these

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 21

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A cantilever beam ofcross section area ‘A’, moment of Inertia ‘I’ and length ‘L’ is having
natural frequency $$\omega 1$$. If the beam is accidently broken into two halves, the natural
frequency of the remaining cantilever beam $$\omega 2$$ will be such that

A

$$\omega 1 < \omega 2$$

B

$$\omega 2 > \omega 1$$

C

$$\omega 2 = \omega 1$$

D

Cannot be obtained from the given data

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ISRO Scientist or Engineer Mechanical Dec 2017 - Question 22

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In CAD, the geometric transformation is expressed as P * = [T]P where T is the transformation matrix. If the matrix T is diagonal, then the transformation is called

A

translation

B

reflection

C

rotation

D

scaling

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 23

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A water tank is located 3 m above ground and depth of water in tank is 2 m. Exit pipe is 50 mm in dia and 50 m long. Velocity of water at the exit at the ground level is approximately (Take friction factor f = 0.05, g = 10 m/s$$^2$$)

A

1.5 m/s

B

2 m/s

C

0.7 m/s

D

1/4 m/s

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 24

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The work ratio of a gas turbine is a function of

A

temperature ratio and pressure ratio

B

pressure ratio

C

temperature ratio

D

none of these

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 25

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The distribution of temperature T, at a particular instant, across a large concrete wall, 1 m thick, which is heated from one sideis given by the equation $$T = 150 - 80x + 16x^2$$, where the distance x is in meters and Tis in degree Celsius. Thermal conductivity of wall is 0.6 W/mK, area of cross section is 10 m?. The heat accumulated in unit time at this instant in the concrete wall is —

A

768 J/sec

B

384 J/sec

C

96 J/sec

D

192 J/sec

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 26

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Which one of the following is the permanent mould casting process?

A

Investment casting process

B

Full mould process

C

Vacuum casting process

D

Die casting process

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 27

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Identify the geometric characteristic that describe the feature geometry and the inter-relationship of part features

A

form tolerance

B

form

C

orientation tolerance

D

dimension

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 28

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Isothermal compressibility of an ideal gas is

A

$$\frac{nR}{VP}$$

B

$$\frac{nRT}{VP^2}$$

C

$$\frac{nR}{VP^2}$$

D

$$\frac{nRT}{VP}$$

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 29

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Datum features on the part are

A

permanent

B

temporary

C

either permanent or temporary

D

none of these

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 30

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The eigen values of $$A = \begin{bmatrix}2 & 2 & 4 \\2 & -1 & 2 \\4 & 2 & 2 \end{bmatrix}$$ are,

A

2, 7, 2

B

-7, -2, -2

C

-2, -2, 7

D

2, -1, 2

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 31

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In process charts, the symbol used for inspection is

A

B

C

D

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 32

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Efficiency of gas turbines lies between

A

85 to 95%

B

50 to 60%

C

30 to 50%

D

15 to 18%

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 33

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Which one of the following is impulse turbine?

A

Francis turbine

B

Kaplan turbine

C

Pelton turbine

D

none of these

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 34

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Which of the following is FALSEfor bolted joints?

A

Bolted joints are preloaded to avoid vibration loosening

B

Threads madeby thread rolling process are preferred over machined threadsin bolts

C

When external load is applied to a preloaded bolt joint, a bigger percentage of that load relieves compression of flanges and remaining percentage increases tension in bolts

D

Bolted joints are designed suchthatbolt stiffnessis higher than flange stiffness

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 35

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Root opening of a Single Vee groove weld joint of plate thickness "t" is

A

$$\frac{t}{3}$$

B

$$\frac{t}{4}$$

C

$$\frac{t}{5}$$

D

$$\frac{t}{6}$$

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 36

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A cubic B-spline curve requires minimum .......... control points.

A

3

B

4

C

5

D

6

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 37

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Transportation method is concerned with

A

Value analysis

B

Linear programming

C

Queing theory

D

Break-even analysis

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ISRO Scientist or Engineer Mechanical Dec 2017 - Question 38

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The reaction in which a liquid phase transform into twodifferent solid phases is called

A

Eutectoid reaction

B

Peritectic reaction

C

Eutectic reaction

D

Peritectoid reaction

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 39

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Margin wearin drill is due to

A

abrasion

B

vibration

C

thermal softening

D

diffusion

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 40

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The specific speed of the Kaplan turbine is

A

2.0 — 5.0

B

< 0.3

C

0.3 - 2.0

D

none of these

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 41

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If $$f(t) = e^{at}$$, its Laplace Transform (for s > a) is given by

A

$$\frac{a}{s^2} + (s - a)$$

B

$$\frac{\sqrt{\pi}}{2(s - a)}$$

C

$$\frac{1}{(s - a)}$$

D

Does not exist

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 42

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Smallest thickness which can be measured bya slip gauge is

A

1.001 mm

B

0.01 mm

C

0.001 mm

D

none of these

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 43

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The deflection of an elastic member at the point of application of a force in the direction of that force is given by the derivative of member's total strain energy taken with respect to applied force. This is known as

A

Principle of conservation of strain energy

B

Castigliano’s theorem

C

Conservation of momentum

D

Saint-Venant's Principle

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 44

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Thumb rule between feed and nose radius in rough turning is

A

f = 0:3 r

B

f = 0.5 r

C

f = 0.7 r

D

f = 0.9 r

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 45

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Which of the following is FALSE?

A

A reverted gear train is one in which the first and last gears are on the same axis.

B

Train value for a gear is the ratio of productof driven tooth numbers to product of driving tooth numbers.

C

A planetary gear train is one in which the axes of some of the gears may have a motion.

D

A compound geartrain is one which has two or more gears on each axis.

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 46

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Which of the following is true for ductile materials?

A

Engineering stress - strain curve cannot have negative slope

B

Most applicable failure theory is maximum principal stress theory

C

Ultimate strain is the strain at ultimate stress

D

Strain hardening is represented by a negative slope in engineering stress strain curve

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 47

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The specific metal cutting energy is expressed as
where '$$\alpha$$' is rake angle, '$$\beta$$' is friction angle, '$$\phi$$' is shear angle and '$$\tau$$' shear stress

A

$$\frac{\tau \cos(\beta - \alpha)}{\sin \phi \cos (\phi + \beta - \alpha)}$$

B

$$\frac{\tau \sin(\beta - \alpha)}{\sin \phi \cos (\phi - \beta + \alpha)}$$

C

$$\frac{\tau \cos(\alpha - \beta)}{\sin \phi \cos (\phi - \beta + \alpha)}$$

D

$$\frac{\tau \sin(\alpha - \beta)}{\sin \phi \cos (\phi + \beta - \alpha)}$$

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 48

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For isotropic materials, the modulus of Elasticity in tension and shear (E and G)are related to the Poisson’s ratio (v) as follows

A

$$E = \frac{G}{2(1 + v)}$$

B

$$G = \frac{E}{2(1 + v)}$$

C

$$G = \frac{E}{2(1 - v)}$$

D

$$E = \frac{G}{2(1 - v)}$$

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 49

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Which of the following is NOT true?

A

For direct impact of two bodies, coefficient of restitution is the ratio of relative velocity of approachof the two bodies to their relative velocity of separation

B

Conservation of angular momentum implies that total angular momentum of a system remains constant unless acted on by an external torque

C

Conservation of linear momentum in a given direction implies that the sum of external forces in that direction is zero

D

The coefficient of friction is independent of area of contact

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 50

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A block (of cross section 4 $$\times$$ 3 m size) of 20 kg mass rests on a flat horizontal surface as shown in figure below. If the coefficient of friction between the block and the surface is $$\frac{1}{4}$$, the force ‘F’ which will cause block to move is approximately given by

A

20 kgf

B

10 kgf

C

5 kgf

D

8.7 kgf

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 51

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A point P moves along the path $$y = x^2 - 4$$. What is the displacement when the point moves from x = 1 to x = 3

A

$$8.24, @ \tan^{-1} (4)^\circ$$

B

$$2, @ \tan^{-1} (1)^\circ$$

C

$$11.3, @ \tan^{-1} (4)^\circ$$

D

$$11.3, @ \tan^{-1} (1)^\circ$$

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 52

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The pulley system shown in figure has a mass of 1.5 kg and a radius of gyration of 0.2 m. The angular acceleration of the pulleys, when the suspended masses are released is

A

5 rad/sec$$^2$$

B

$$\frac{10}{1.3}$$ rad/sec$$^2$$

C

$$\frac{15}{1.3}$$ rad/sec$$^2$$

D

10 rad/sec$$^2$$

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 53

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A U tube manometer shown in figure is used to measure the gauge pressure of water of density $$\rho_1 = 1000 kg/m^3$$. If the density of manometer liquid $$\rho_2$$ is $$12000 kg/m^3$$ hl = 0.5 m & h2 = 1.0 m, gauge pressure at ‘A’, the centre of tube is (take g = 10 m/s$$^2$$)

A

125 kPa

B

115 kPa

C

60 kPa

D

5 kPa

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 54

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A man draws 3 balls from a jug containing 5 whiteballs and 7 black balls. He gets Rs. 20 for each white ball and Rs. 10 for each black ball. What is his expectation?

A

Rs. 21.25

B

Rs. 42.50

C

Rs. 31.25

D

Rs. 45.21

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 55

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The missing dimension in the following simple part is

A

$$11.5 \pm 1.5$$

B

$$11.5 \pm 2.5$$

C

$$11.5 \pm 3.5$$

D

$$11.5 \pm 4.5$$

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 56

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Which one of the following is FALSE about Boronizing process?

A

it is a pack cementation process

B

it can be done only on high carbon steels

C

it is used to obtain extremely high wearresistant surfaces on steels

D

it leads to high distortion

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 57

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In dynamic balancing of machines, which of the following is NOT a method of measuring the magnitude andlocation of correction weight for a two plane correction?

A

Pivoted cradle method

B

Mechanical compensation method

C

Pivoted compensation method

D

Nodal point method

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 58

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The stress produced in a wire of diameter 6 mm, when it is bend around a large cylinder of diameter 2 m can be obtained as (Young’s modulus of both wire and cylinder = 200 GPa, the stress strain curve of the material is given below)

A

600 MPa

B

300 MPa

C

100 MPa

D

200 MPa

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 59

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The critical pressure ratio for maximum discharge in steam nozzle is

A

$$\frac{2}{\gamma + 1}$$

B

$$\left(\frac{2}{\gamma + 1}\right)^{\gamma}$$

C

$$\left(\frac{2}{\gamma + 1}\right)^{\gamma - 1}$$

D

$$\left(\frac{2}{\gamma + 1}\right)^{\frac{\gamma}{\gamma - 1}}$$

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 60

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The type of locator used to prevent jamming during locating of a workpiece is

A

concentric locator

B

integral locator

C

equilateral locator

D

spherical locator

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 61

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A carton carrying vessel of mass 10 tons (width = length = 5 m, height = 6 m), floats on water. The mass of contents of the vessel are symmetrically placed. If the vessel tilts by 0.01 radians by moving a 50 kg carton from the centre by a distance of 2 m towards side in horizontal direction, the metacentric height of the vessel is (g = 10m/s$$^2$$)

A

1 m

B

3 m

C

1.5 m

D

2 m

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 62

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The maximum value of reduction in rolling process is
Where ‘D’ is roll diameter and ‘$$\alpha$$’ is the angleof bite

A

$$\frac{D}{2}\left[1 - \frac{\cos \alpha}{2}\right]$$

B

$$\frac{D}{2}\left[1 - \cos \alpha\right]$$

C

$$D \left(1 - \sin \alpha\right)$$

D

$$\frac{D}{2}\left[1 - \sin \alpha\right]$$

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 63

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Which of the following is TRUE for vibration of a mechanical system

A

Dampingratio ($$\xi$$) is the ratioof thecritical damping to the actual damping

B

The damping can be obtained from the response of the system under forced vibration using logarithmic decrement method

C

For damped mechanical systems, the amplitude of vibration tends to become infinity when excitation frequency ($$\omega$$) reaches the system’s natural frequency ($$\omega_n$$)

D

Amplitude ratio and transmissibility of a vibration isolator is unity when the frequency of exciting force is $$\sqrt{2}$$ times the natural frequency

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ISRO Scientist or Engineer Mechanical Dec 2017 - Question 64

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What is the maximum rate that a heat pump which uses 1 kW of electric power can supply heat to a house at $$27^\circ C$$ when the outside temperature is $$12^\circ C$$

A

50 J/s

B

25 kJ/s

C

20 kJ/s

D

30 J/s

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 65

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Evaluate $$\int_{0}^{1} \int_{0}^{1} \frac{1}{\sqrt{(1 - x^2)(1 - y^2)}} dxdy$$

A

$$\frac{\pi}{2}$$

B

$$\frac{\pi}{4}$$

C

$$\frac{\pi^2}{2}$$

D

$$\frac{\pi^2}{4}$$

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 66

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White iron structure consists of

A

Pearlite

B

Cementite

C

Ferrite

D

Pearlite and Cementite

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 67

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A cantilever beam of rectangular cross section (depth ‘d’, width ‘b’ & length ‘L’) is subjected to a shear force ‘F’ at its free end as shown in figure. The beam is made of material which follows maximum shear stress theory. Which of the following is TRUE?

A

The beam section has a uniform shearstress, $$\frac{F}{bd}$$

B

Maximum shearstress in section and maximum bending stress in beam is equal when $$L = \frac{d}{2}$$

C

For $$L > \frac{d}{2}$$, bending stress decides the failure stress.

D

Bending stress developed in the beam is independent of ‘b’

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ISRO Scientist or Engineer Mechanical Dec 2017 - Question 68

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A jet engine consumes 1 kgof fuel for each 40 kg ofair intake. Fuel consumption is 1 kg/sec. When aircraft travels in still air at 200 m/sec, velocity of discharge gases with respect to engine is 700 m/sec. The power developed by engine is

A

7200 kW

B

5600 kW

C

2070 kW

D

4140 kW

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ISRO Scientist or Engineer Mechanical Dec 2017 - Question 69

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Which of the following is most appropriate for vapour power cycles?

A

In Carnot cycle, expansion of vapour occurs without change in entropy

B

In Rankine cycle, transformation of liquid water in steam generator occurs at constant temperature

C

In Carnotcycle, heating of vapor occurs at constant volume

D

In Rankinecycle, entropy of vapor increases during its expansion in steam turbine

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ISRO Scientist or Engineer Mechanical Dec 2017 - Question 70

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Load Vs Displacement curve shown in the following figure pertains to

A

Extrusion

B

Bending

C

Blanking

D

Coining

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ISRO Scientist or Engineer Mechanical Dec 2017 - Question 71

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The reheatfactor $$R_f$$ for a steam turbineis usually in the range of

A

O to 1

B

1 to 1.065

C

2 to 2.065

D

5 to 10

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 72

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Adaptive responserate forecasting is related to

A

Production Planning

B

Production Scheduling

C

Value analysis

D

Inventory control

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ISRO Scientist or Engineer Mechanical Dec 2017 - Question 73

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Process in which lowest tolerances in cast products of ferrous and non ferrous metals can be achieved is

A

Die casting

B

Shell casting

C

Investment casting

D

Sand casting

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 74

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Pickling treatment is cleaning the casting with

A

Soda ash

B

Dilute acid

C

Compressed air and sand particles

D

Iron shots

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ISRO Scientist or Engineer Mechanical Dec 2017 - Question 75

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Element which makes steel stainless

A

Mg

B

Ni

C

C

D

Cr

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 76

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Isentropic process is related to

A

Adiabatic Expansion

B

Reversible Adiabatic Expansion

C

Isothermal Expansion

D

Reversible Isothermal Expansion

View Solution

ISRO Scientist or Engineer Mechanical Dec 2017 - Question 77

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Tolerances generally followed for tooling design are

A

5 - 10% of workpiece tolerance

B

11 - 30% of workpiece tolerance

C

31 - 50% of workpiece tolerance

D

none of these

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ISRO Scientist or Engineer Mechanical Dec 2017 - Question 78

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Whichof the following is FALSE about Normal distribution?

A

Normal Distribution is applied for discrete Random Distribution

B

The shape of the Normal Curveis Bell Shaped

C

The area under a standard normal curveis 1

D

The standard normal curve is symmetric about the value 0

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ISRO Scientist or Engineer Mechanical Dec 2017 - Question 79

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The temperature of the products of combustion when the maximum amountof chemical energy is converted to thermal energy is

A

Higher than adiabatic flame temperature

B

Lower than adiabatic flame temperature

C

Equalto adiabatic flame temperature

D

Independent of adiabatic flame temperature

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ISRO Scientist or Engineer Mechanical Dec 2017 - Question 80

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Fredric W Taylor introduced a system of working known as

A

line organisation

B

effective organisation

C

functional organisation

D

none of the above

View Solution