Match List I with List If and select the correct answer
ISRO Scientist or Engineer Mechanical 2011
For the following questions answer them individually
Reversible adiabatic process may be expressed as $$\left(\frac {T_1}{T_2}\right)$$ equal to
A gas is so expanded in a cylinder that its temperature remains constant. The resulting variation of pressure vs. volume is
According to first law of thermodynamics
Pick up the incorrect statement for centrifugal pumps
If the discharge of a centrifugal pump is throttled then its suction lift
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
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
Flow takes place at Reynolds Numberof 1500 in two different pipes with relative roughness of 0.001 and 0.002. The friction factor
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$$. The bulk modulus of elasticity of liquid is
A fluid jet is discharging from a 100 mm nozzle and the vena contracta formed has a diameter of 90 mm. If the coefficient of velocity is 0.95, then the coefficient of discharge for the nozzle is
A fully developed laminar viscous flow through a circular tube has the ratio of maximum velocity to average velocityas
If the surface tension of water-air interface is 6.073 N/m, the gauge pressure inside a rain drop of 1 mm diameter will be
A stream function is given by $$(x^2 - y^2)$$. The potential function of the flow will be
The temperature profile between two metal walls joined together is shown in Fig.From the figure it can be concluded that
According to Fourier’s law, amount of heat flow (Q) through the body in unit time is equal to
Pitch diameter is equal to the product of
The tension in the cable supporting a lift moving upwardsis twice the tension when the lift moves downwards. Whatis the acceleration of the lift? |
Whirling speed of a shaft coincides with the natural frequency of its
Oscillation of a particle is prescribed by the equation $$ x = 3 \cos(0.25 \pi t),$$ where t is the time in seconds. The time taken by the particle to move from position of equilibrium to maximum displacement is
If two objects are weighed in water and both of them lose the same weight, then the two objects must have identical
1kg of moist air of RH 70% at $$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$$ is
Two spherical balis of same material and surface finish have their diameters in the ratio of 2:1. Both are heated to same temperature and allowed to cool by radiation. Rate of cooling of big ball as compared to smaller one will be in the ratio of
Ninety kilograms of ice at $$0^\circ C$$ are completely melted. Find the entropy change, in kJ/K, if $$T_2 = 0^\circ C.$$ (Latent heat of fusion is 318.5 kJ/kg.K)
A solid shaft of 100mm diameter transmits 160 HP at 200rpm. The modulus of rigidity $$c = 8 \times 10^5 kg/cm^2$$ .Then the maximum angle of twist for a length of 6 meteris
A perfect gas at $$ 27^\circ C $$ is heated at constant pressure till its volume is double. The final temperature is
The stagnation temperature of an isentropic flow of air (k = 1.4) is 360 K. If the temperature is 200 K at a section, then the Mach numberof the flow will be
Air at $$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$$ , the heat transfer rate is
A small plastic boat loaded with pieces of steel rods is floating in a bath tub. If the cargo is dumped into the water allowing the boatto float empty, the water level in the tub will
When a jet plane flying at 300 m/s is at the very top of its trajectory, the apparent weight of a passenger is one half of her actual weight. Find the radius of curvature R of the flight path at this point. Use $$ g = 10 m/s^2.$$
Two cars are moving in the same direction with a speed of 45 km/hr and a distance of 10 km separates them. If a car coming from the opposite direction meets these two cars at an interval of 6 minutes, its speed would be
If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then energy stored in the later at the same speed will be
Tungsten in High Speed Steel provides.
Which of the following regions of the electromagnetic spectrum would be used to determine the structure of crystallme solids?
Fluidity in. casting (CI) operation is greatly influenced by
Robert Hooke discovered experimentally that within elastic limit
Two heavy rotating masses are connected by shafts of lengths $$ l_1, l_2 and l_3,$$ and the corresponding diameters are $$d_1, d_2 and d_3.$$ this system is reduced to a torsionally equivalent length of the shafts is
Precipitation hardening is applicable for
Match the lists I and II using code given below
The mass moment of inertia of a cube with edges of length b, about an axis passing through an edge
A thin cylinder contains fluid at a pressure of $$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$$. The shell must have minimum wall thickness of.
When a shaft is subjected to combined twisting moment (T) and bending moment (M), the equivalent twisting moment is equal to
Two blocks with masses M and m are in contact with each other and are resting on 2 horizontal friction less floor. When horizontal force F is applied to the heavier, the blocks accelerate to the right. The force between the two blocks are
A machine mounted on a single coil spring has a perriod of free vibration of T. If the spring is cut into four equal parts and placed in parallel and the machine is mounted on them, then the period of free vibration of the new system will be
Dislocations in materials are
Which of the following thermocouple is capable of measuring highest temperature?
Acircular rod of 100mm diameter and 500mm length is subjected to a tensile force of 1000KN. Determine the modulus of rigidity (G) if $$E = 2 \times 10^5 N/mm^2$$ and Poisson’s = 0.3
For the state of stress shown in the above figure, normal stress acting on the plane of maximum shear stress is
The effective diameter of an external or internal screw thread, is known as
Consider the following statements:
If at section away from the ends of the beam, M represents the bending moment, $$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$$
Of these statements
For a column of length L is fixed at both ends, corresponding Euler’s critical load is
Which one of the following figures is the correct sketch of Mohr’s circle of the given state of stress
With a punch for which the maximum crushing stress is 4 times the maximum shearing stress of the plate, the biggest hole that can be punchedi in the plate would be of diameter equal to
A simply supported beam with width ‘b’ and. depth ‘d’ carries a central load W and undergoes deflection $$\delta$$ at the centre. If the width and depth are interchanged, the deflection at the centre of the beam would attain the value:
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
In arc welding, penetration is minimum for
Match list - I (welding effects) with list II (causes) and select the correct answer using the codes given below the lists:
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,
The number of degree of freedom of a five link plane mechanism with five revolute pairs as shown in the figure is
To ensure self locking in a screw jack, it is essential that helix angle is
A cutting tool having tool signature as 10, 9, 6, 6, 8, 8, 2 will have side rake angle
In radiographic test, type of defect not detectable by X-Rayis
In CAM, “Part programming” refers to
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
Which of the following screw thread is adapted for power transmission in one direction
CLA value and RMS values are used for measurement of
A sine bar is specified by
A shaft and hole pair is designated as 50H7d8. This assembly constitutes
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?
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
The equation of the tangent to the curve y (x - 2)(x - 3) - x + 7 = 0, at the point where it cuts the x-axis is
If the imaginary part of $$\frac {2z + 1}{iz + 1}$$ is —2, then the locus of the point z in the complex plane is
General solution of the differential equation $$(D^2 - 2D + 1)y = e^x$$ is
In a simple micrometer with screw pitch 0.5 mm and divisions on thimble 50, the reading corresponding to 5 divisions on barrel and 12 divisions on thimble is
The value of $$\begin{bmatrix}a & b & c \\b + c & c + a & a + b \\a^2 &b^2 & c^2 \\ \end{bmatrix}$$ is
If $$v = (x^2 + y^2 + z^2)^{\frac {-1}{2}}$$, then $$\frac{\partial^2 v}{\partial x^2} + \frac{\partial^2 v}{\partial y^2} + \frac{\partial^2 v}{\partial z^2}$$ is
The image of the point(1,2,3) in the plane 2x + y + z = 13 is
The value of curl of the vector $$v = (xyz)\widehat{i} + (3x^2y)\widehat{j} + (xz^2 - y^2z)\widehat{k}$$ at the point (2, -1, 1) is
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
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
