ISRO Scientist or Engineer Mechanical 2011

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ISRO Scientist or Engineer Mechanical 2011 - Question 2

Reversible adiabatic process may be expressed as $$\left(\frac {T_1}{T_2}\right)$$ equal to

ISRO Scientist or Engineer Mechanical 2011 - Question 4

According to first law of thermodynamics

ISRO Scientist or Engineer Mechanical 2011 - Question 7

A cylindrical body of cross-sectional area A height H and the density $$\rho_s$$, is immersed to a depth h in a liquid of density $$\rho$$, and tied to the bottom with a string. The tension in the string is

ISRO Scientist or Engineer Mechanical 2011 - Question 8

A manometer méasures the pressure differential between two locations of a pipe carrying water. If the manometric liquid is mercury (specific gravity 13.6) and the manometer showeda level difference of 20 cm, then the pressure head difference of water between the two tapings will be

ISRO Scientist or Engineer Mechanical 2011 - Question 9

Flow takes place at Reynolds Numberof 1500 in two different pipes with relative roughness of 0.001 and 0.002. The friction factor

ISRO Scientist or Engineer Mechanical 2011 - Question 10

A liquid compressedi in cylinder has a volume of $$0.04 m^3$$ at $$50 kg/cm^2 and a volume of $$0.039 m^3$$ at $$150 kg/cm^2$$. The bulk modulus of elasticity of liquid is

ISRO Scientist or Engineer Mechanical 2011 - Question 11

A fluid jet is discharging from a 100 mm nozzle and the vena contracta formed has a diameter of 90 mm. If the coefficient of velocity is 0.95, then the coefficient of discharge for the nozzle is

ISRO Scientist or Engineer Mechanical 2011 - Question 15

The temperature profile between two metal walls joined together is shown in Fig.From the figure it can be concluded that

ISRO Scientist or Engineer Mechanical 2011 - Question 20

Oscillation of a particle is prescribed by the equation $$ x = 3 \cos(0.25 \pi t),$$ where t is the time in seconds. The time taken by the particle to move from position of equilibrium to maximum displacement is

ISRO Scientist or Engineer Mechanical 2011 - Question 22

1kg of moist air of RH 70% at $$21^\circ C$$ is cooled at constant pressure of 1 bar to $$5^\circ C.$$ The vapour pressure at $$21^\circ C$$ and $$5^\circ C$$ are 0.025 bar and 0.0087 bar. The percentage of water vapour that condenses into water, at $$ 5^\circ C$$ is

ISRO Scientist or Engineer Mechanical 2011 - Question 23

Two spherical balis of same material and surface finish have their diameters in the ratio of 2:1. Both are heated to same temperature and allowed to cool by radiation. Rate of cooling of big ball as compared to smaller one will be in the ratio of

ISRO Scientist or Engineer Mechanical 2011 - Question 25

A solid shaft of 100mm diameter transmits 160 HP at 200rpm. The modulus of rigidity $$c = 8 \times 10^5 kg/cm^2$$ .Then the maximum angle of twist for a length of 6 meteris

ISRO Scientist or Engineer Mechanical 2011 - Question 28

Air at $$20^\circ C$$ blows over a plate of $$50 cm \times 75 cm$$ maintained at $$250^\circ C.$$ If the convection heat transfer coefficient is $$ 25W/m^{2^\circ} C$$ , the heat transfer rate is

ISRO Scientist or Engineer Mechanical 2011 - Question 29

A small plastic boat loaded with pieces of steel rods is floating in a bath tub. If the cargo is dumped into the water allowing the boatto float empty, the water level in the tub will

ISRO Scientist or Engineer Mechanical 2011 - Question 30

When a jet plane flying at 300 m/s is at the very top of its trajectory, the apparent weight of a passenger is one half of her actual weight. Find the radius of curvature R of the flight path at this point. Use $$ g = 10 m/s^2.$$

ISRO Scientist or Engineer Mechanical 2011 - Question 31

Two cars are moving in the same direction with a speed of 45 km/hr and a distance of 10 km separates them. If a car coming from the opposite direction meets these two cars at an interval of 6 minutes, its speed would be

ISRO Scientist or Engineer Mechanical 2011 - Question 32

If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then energy stored in the later at the same speed will be

ISRO Scientist or Engineer Mechanical 2011 - Question 37

Two heavy rotating masses are connected by shafts of lengths $$ l_1, l_2 and l_3,$$ and the corresponding diameters are $$d_1, d_2 and d_3.$$ this system is reduced to a torsionally equivalent length of the shafts is

ISRO Scientist or Engineer Mechanical 2011 - Question 41

A thin cylinder contains fluid at a pressure of $$30 kg/cm^2$$.The inside diameter of the shell is 60 cm and the tensile stress in the material is to be limited to $$900 kg/cm^2$$. The shell must have minimum wall thickness of.

ISRO Scientist or Engineer Mechanical 2011 - Question 42

When a shaft is subjected to combined twisting moment (T) and bending moment (M), the equivalent twisting moment is equal to

ISRO Scientist or Engineer Mechanical 2011 - Question 43

Two blocks with masses M and m are in contact with each other and are resting on 2 horizontal friction less floor. When horizontal force F is applied to the heavier, the blocks accelerate to the right. The force between the two blocks are

ISRO Scientist or Engineer Mechanical 2011 - Question 44

A machine mounted on a single coil spring has a perriod of free vibration of T. If the spring is cut into four equal parts and placed in parallel and the machine is mounted on them, then the period of free vibration of the new system will be

ISRO Scientist or Engineer Mechanical 2011 - Question 47

Acircular rod of 100mm diameter and 500mm length is subjected to a tensile force of 1000KN. Determine the modulus of rigidity (G) if $$E = 2 \times 10^5 N/mm^2$$ and Poisson’s = 0.3

ISRO Scientist or Engineer Mechanical 2011 - Question 50

Consider the following statements:
If at section away from the ends of the beam, M represents the bending moment, $$V$$ the shear force, $$w$$ the intensity of loading and $$y$$ represents the deflection of the beam at the section, then
1.$$\frac{dM}{dx} = V$$
2.$$\frac{dV}{dx} = w$$
3.$$\frac{dw}{dx} = y$$
Of these statements

ISRO Scientist or Engineer Mechanical 2011 - Question 53

With a punch for which the maximum crushing stress is 4 times the maximum shearing stress of the plate, the biggest hole that can be punchedi in the plate would be of diameter equal to

ISRO Scientist or Engineer Mechanical 2011 - Question 54

A simply supported beam with width ‘b’ and. depth ‘d’ carries a central load W and undergoes deflection $$\delta$$ at the centre. If the width and depth are interchanged, the deflection at the centre of the beam would attain the value:

ISRO Scientist or Engineer Mechanical 2011 - Question 55

The given figure shows a cantilever of span ‘L’ subjected to a concentrated load ‘P’ and a moment ‘M’ at the free end. Deflection at the free end is given by

ISRO Scientist or Engineer Mechanical 2011 - Question 58

Two beams of equal cross sectional area are subjected to equal bending moment. If one beam has square section and the other has circular section then,

ISRO Scientist or Engineer Mechanical 2011 - Question 64

A 50mm diameter steel rod was turned at 284 rpm and tool failure occurred in 10 minutes. The speed was changed to 232 rpm and the tool failed in 60 minutes. Assuming straight line relationship between cutting Speed and tool life, the value of Taylorian Exponent is

ISRO Scientist or Engineer Mechanical 2011 - Question 69

A milling machine has the following two index plates supplied along with the indexing head:
Plate 1: 15, 16,17,18, 19, 20, hole circles
Plate 2: 21,23,27,29,31,33, hole circles
It is proposed to mill a spur gear of 28 teeth using simple indexing method. Which one of the following combinations of index plate and number of revolutions is correct?

ISRO Scientist or Engineer Mechanical 2011 - Question 70

The initial blank diameter required to form a cylindrical cup of outside diameter ’d’ and total height ‘h’ having a corner radius ‘r’ is obtained using the formula

ISRO Scientist or Engineer Mechanical 2011 - Question 73

General solution of the differential equation $$(D^2 - 2D + 1)y = e^x$$ is

ISRO Scientist or Engineer Mechanical 2011 - Question 78

The value of curl of the vector $$v = (xyz)\widehat{i} + (3x^2y)\widehat{j} + (xz^2 - y^2z)\widehat{k}$$ at the point (2, -1, 1) is

ISRO Scientist or Engineer Mechanical 2011 - Question 79

An open tank contains water to a depth of 2 m and oil over it toa depth of 1m. If the specific gravity of oil is 0.8, then the pressure intensity at the interface of the two fluid layers will be

ISRO Scientist or Engineer Mechanical 2011 - Question 80

A box contains 6 black and 5 red balls. Twe balls are drawn one after another from the box without replacement. The probability for both balls to be red is

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