ISRO Scientist or Engineer Mechanical 2010

ISRO Scientist or Engineer Mechanical 2010 - Question 1

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If thermal conductivity of a material of wall varies as $$k_0(1 - \alpha T)$$, the temperature at the center of the wall will be ($$\alpha$$ is +ve)

A

Depends on other factors

B

More than that in case of constant thermal conductivity

C

Less than that in case of constant thermal conductivity

D

None of the above

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ISRO Scientist or Engineer Mechanical 2010 - Question 2

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The spectral emissive power $$E_1$$ ; for a diffusely emitting surface is $$E_1 = 0 for \lambda < 3\mu m; E_1 = 150 W/m^2 \mu m for 3 < \lambda < 12 \mu m; E_1 = 300W/m^2 \mu m for 12 < \lambda < 25 \mu m; E_1 = 0 for \lambda > 25 \mu m.$$ The total emissive power of the surface over the entire spectrum is

A

$$1250 W/m^2$$

B

$$2500 W/m^2$$

C

$$4000 W/m^2$$

D

$$5250 W/m^2$$

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ISRO Scientist or Engineer Mechanical 2010 - Question 3

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A wire is plastically deformed bent by supplying a force of 40 N over a distance of 0.8 m. (The force moves in the direction in which the distance is measured). If the wire has a mass of 0.2 kg and a specific heat of $$0.5 kJ/kg.^\circ C$$ estimate the maximum increase in the average temperature of the wire

A

$$0.03^\circ C$$

B

$$0.3^\circ C$$

C

$$3^\circ C$$

D

$$30^\circ C$$

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ISRO Scientist or Engineer Mechanical 2010 - Question 4

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Two rods one of length L and the other of length 2L are made of the same material and have the same diameter. The two ends of the longer diameter. The two ends of the longer rod are maintained at $$100^\circ C$$. One end of the shorter rod is maintained at $$100^\circ C$$ while the other end is insulated. Both the rods are exposed to the same environment at $$40^\circ C$$. The temperature at the insulated end of the shorter rod is measured to be $$55^\circ C$$. The temperature at the midpoint of the longer rod would be

A

$$40^\circ C$$

B

$$50^\circ C$$

C

$$55^\circ C$$

D

$$100^\circ C$$

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ISRO Scientist or Engineer Mechanical 2010 - Question 5

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A sphere, a cube and disc all of the same material, quality and volume are heated to 900 K and left in air. Which of these will have the lowest rate of cooling

A

Cube

B

Disc

C

Sphere

D

All will have the same rate of cooling

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ISRO Scientist or Engineer Mechanical 2010 - Question 6

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Air with initial condition of p1,vl expands to final condition of $$p1/2, 3v_1.$$ The process is

A

Hyperbolic

B

Adiabatic

C

Polytropic with n > 1

D

Polytropic with n < 1

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 7

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Sun’s surface at 5800 K emits radiation at a wavelength of $$0.5\mu A$$ furnace at $$300^\circ C$$ will emit through a small opening, radiation at a wavelength of

A

$$5\mu$$

B

$$0.5\mu$$

C

$$2.5\mu$$

D

$$0.25\mu$$

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 8

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Polytropic index x is given by

A

$$\frac{\log \left( \frac {p_2}{p_1}\right)}{\log \left( \frac {v_1}{v_2}\right)}$$

B

$$\frac{\log \left( \frac {p_1}{p_2}\right)}{\log \left( \frac {v_1}{v_2}\right)}$$

C

$$\frac{\log \left( \frac {v_1}{v_2}\right)}{\log \left( \frac {p_2}{p_1}\right)}$$

D

$$\frac{\log \left( \frac {v_2}{v_1}\right)}{\log \left( \frac {p_2}{p_1}\right)}$$

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 9

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The heat flow rate through parallel walls of thickness $$L_1, L_2, and L_3$$ and having surface areas $$A_1, A_2, and A_3$$, thermal conductivities $$k_1, k_2, and k_3,$$ respectively and first and last walls maintained at temperatures $$t_1 and t_2$$ will be

A

$$\frac{t_1 - t_2}{\frac {L_1}{A_1K_1} + \frac{L_2}{A_2K_2} + \frac{L_3}{A_3K_3}}$$

B

$$\frac{t_1 - t_2}{\frac {k_1}{A_1L_1} + \frac{k_2}{A_2L_2} + \frac{k_3}{A_3L_3}}$$

C

$$\frac{t_1 - t_2}{\frac {k_1A_1}{L_1} + \frac{k_2A_2}{L_2} + \frac{k_3A_3}{L_3}}$$

D

$$\frac{t_1 - t_2}{\frac {L_1A_1}{k_1} + \frac{L_2}{k_3} + \frac{L_3}{k_3}}$$

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 10

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Which of the following property of air does not increase with rise in temperature?

A

Specific gravity

B

Kinematic viscosity

C

Thermal conductivity

D

Thermal diffusivity

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ISRO Scientist or Engineer Mechanical 2010 - Question 11

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Choose the correct figure representing gas to gas heat transfer in parallel flow heat exchanger?

A

B

C

D

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ISRO Scientist or Engineer Mechanical 2010 - Question 12

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The value of Prandtl number for air is about

A

0.1

B

0.3

C

0.7

D

10.5

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 13

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4 body cools from $$90^\circ C to 80^\circ C$$ in 5 minutes. Under the same external conditions to cool from $$80^\circ C to 70^\circ C$$ the body will take

A

5 minutes

B

4 minutes

C

2.5 minutes

D

More than 5 minutes

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 14

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When the temperature of a solid surface changes from $$227^\circ C to 1227^\circ C$$ its total emissive power changes from $$E_1 to E_2.$$ The ratio $$\left(\frac {E_2} {E_1}\right)$$ will be

A

3

B

9

C

81

D

Cannot be determined on the basis of information provided

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ISRO Scientist or Engineer Mechanical 2010 - Question 15

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Characteristic gas constant of a gas is equal to

A

$$\frac {C_p}{C_v}$$

B

$$\frac {C_v}{C_p}$$

C

$$ C_p - C_v $$

D

$$ C_p + C_v $$

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ISRO Scientist or Engineer Mechanical 2010 - Question 16

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The matrix $$A = \begin{bmatrix}-4 & -3 & -3 \\1 & 0 & 1 \\4 & 4 & x \end{bmatrix}$$ is its own adjoint. The value of x will be

A

5

B

3

C

-3

D

-5

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 17

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The temperature of sun can be measured using a

A

Standard thermometer

B

Radiation pyrometer

C

Platinum resistance thermometer

D

Mercury thermometer

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ISRO Scientist or Engineer Mechanical 2010 - Question 18

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A car moving with uniform acceleration covers 450 m in a 5 second interval, and covers 700 m in the next 5 second interval. The acceleration of the car is

A

$$7 m/s^2$$

B

$$50 m/s^2$$

C

$$25 m/s^2$$

D

$$10 m/s^2$$

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ISRO Scientist or Engineer Mechanical 2010 - Question 19

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A particle starts from rest with a constant acceleration $$\alpha m/sec^2$$ and after some time it decelerates at a uniform rate of $$\beta 8 m/sec^2$$ till it comes to rest. If the total time taken between two rests positions is t, the maximum velocity acquired by the particle would be

A

$$\frac {\alpha + \beta}{2} t $$

B

$$\frac {\alpha - \beta}{2} t $$

C

$$\left(\frac {\alpha \beta}{\alpha + \beta} \right) t$$

D

$$\left(\frac {\alpha + \beta}{\alpha - \beta} \right) t$$

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ISRO Scientist or Engineer Mechanical 2010 - Question 20

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Two metallic blocks having masses in the ratio 2: 3 are made to slide down a friction less inclined plane starting initially from rest position. When these blocks reach the bottom of the inclined plane, they will have their kinetic energies in the ratio

A

2 : 3

B

3 : 5

C

3 : 2

D

7 : 4

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ISRO Scientist or Engineer Mechanical 2010 - Question 21

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A particle is projected at an angle $$\theta$$ to the horizontal and it attains a maximum height H. The time taken by the projectile to reach the highest point, of its path is

A

$$\frac{\sqrt{H}}{g}$$

B

$$\frac{\sqrt{2H}}{g}$$

C

$$\frac{\sqrt{2H \sin \theta}}{g}$$

D

$$\frac{\sqrt{2H}}{\sin \theta}$$

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ISRO Scientist or Engineer Mechanical 2010 - Question 22

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The tension in the cable supporting a lift moving upwards is twice the tension when the lift moves downwards. Whatis the acceleration of the lift?

A

$$\frac{g}{4}$$

B

$$\frac{g}{3}$$

C

$$\frac{g}{2}$$

D

$$g$$

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 23

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For the apparent weight of a body at equator to become zero, the earth should rotate with an angular velocity of

A

$$\sqrt{\frac{2g}{r}}$$

B

$$\sqrt{\frac{g}{r}}$$

C

$$\sqrt{\frac{g}{2r}}$$

D

$$\frac{g}{r}$$

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 24

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A cantilever beam AB of length L and uniform flexural rigidity EI has a bracket AC attached to its free end shown in Fig. Vertical load is applied to the free end C of the bracket. In order that the deflection of point A to be zero the ratio a/L should be

A

$$\frac{1}{2}$$

B

$$\frac{1}{3}$$

C

$$\frac{1}{4}$$

D

$$\frac{2}{3}$$

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ISRO Scientist or Engineer Mechanical 2010 - Question 25

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Given that
$$P_E$$ = the crippling load given by Euler
$$P_C$$ = the loadat failure due to direct compression
$$P_R$$ = the load in accordance with the Rankine’s criterion of failure
Then $$P_R$$ is given by

A

$$\frac{(P_E + P_C)}{2}$$

B

$$\sqrt {P_E \times P_C}$$

C

$$\frac{P_C.P_E}{P_C + P_E}$$

D

None of the above

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ISRO Scientist or Engineer Mechanical 2010 - Question 26

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Bending moment M and torque is applied on a solid circular shaft. If the maximum bending stress equals to maximum shear stress developed, them M is equal to

A

$$\frac{T}{2}$$

B

$$T$$

C

$$2T$$

D

$$4T$$

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 27

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For solid shaft subjected to a torque of 18000 Nm having a permissible shear stress of $$60N/mm^2$$, the diameter of shaft is

A

115mm

B

121mm

C

149mm

D

108mm

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 28

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Shear force is

A

Rate of change of loading

B

Sum of bending moments

C

Rate of change of bending moment

D

None of the above

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ISRO Scientist or Engineer Mechanical 2010 - Question 29

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Maximum deflection in cantilever due to pure bending moment M atits end is

A

$$\frac{MI^2}{2EI}$$

B

$$\frac{MI^2}{3EI}$$

C

$$\frac{MI^2}{4EI}$$

D

$$\frac{MI^2}{6EI}$$

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 30

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Maximum shear stress in Mohr’s circle is equal to

A

Radius of circle

B

Diameter of circle

C

Center of circle from y-axis

D

Chord of circle

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 31

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Hardness of steel depends on

A

Amount of carbon it contains

B

The shape and distribution of the carbides in iron

C

Method of fabrication

D

Contents of alloying elements

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 32

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The modulus of $$1 + \cos \alpha + i \sin \alpha$$ is

A

$$2 \sin \frac {\alpha}{2}$$

B

$$2 \cos \frac {\alpha}{2}$$

C

$$\sin^2 \frac {\alpha}{2} - 1$$

D

$$\cos^2 \frac {\alpha}{2} - 1$$

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 33

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Hardnes of martensite is about

A

RC 65

B

RC 48

C

RC 57

D

RC 80

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 34

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Materials after cold working are subjected to following process to relieve stresses

A

Hot working

B

Tempering

C

Normalizing

D

Annealing

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ISRO Scientist or Engineer Mechanical 2010 - Question 35

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In drop forging the forging is done by

A

Dropping the workpiece at high velocity

B

Dropping the hammer at high velocity

C

Dropping the die with hammer at high velocity

D

Dropping a weight on hammer to produce requisite impact

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 36

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Which of the machine tools can be used for boring
1. Lathe
2. Drilling machine
3. Vertical milling machine
4. Horizontal milling machine

A

1, 2, 3

B

1, 3, 4

C

2 and 4

D

1 and 2

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 37

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The vernier reading should not be taken at its face value before an actual check has been taken for

A

Zero error

B

Its calibration

C

Flatness of measuring jaws

D

Temperature equalization

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 38

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High carbon steel carries carbon percentage of

A

0.1 to 0.3%

B

0.3 to 0.6%

C

0.6 to 0.8%

D

0.8 to 1.5%

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 39

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In order to measure/detect materials by non-destructive testing the method generally used is

A

Acoustic emission

B

Infrared radiometer

C

Liquid crystallography

D

Thermochemic point

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 40

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Shock resisting steels should have

A

Low wear resistance

B

High wear resistance

C

Toughness

D

Poor hardenability

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 41

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A screw having coefficient of friction equal to or greater than the tangent of the load angle is known as

A

Machine screw

B

Self locking screw

C

Set-screws

D

Ball-bearing type screws

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 42

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A bolt is designed with a large factor of safety, on the basis of

A

Direct tensile stress

B

Direct compressive stress

C

Direct bending stress

D

Direct shear stress

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ISRO Scientist or Engineer Mechanical 2010 - Question 43

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For two springs having same stiffness (k) are in series, the equivalent stiffness would be

A

$$\frac{k}{4}$$

B

$$\frac{k}{2}$$

C

$$k$$

D

$$2k$$

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 44

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A material is classified as brittle, if the elongation in a gauge length of 59 mm,is less than

A

1%

B

3%

C

4%

D

5%

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 45

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In an extra humid atmosphere which one of the following motor would you select?

A

Open type

B

Semi-protected

C

Drip proof

D

Totally enclosed fan cooled

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 46

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In fillet weld throat is

A

Perpendicular distance from the root to the hypotenuse

B

The smaller side of triangle of the fillet

C

The larger side of triangle of the fillet

D

None of the above

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 47

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Sensitiveness of a governor is

A

The ratio of the difference between the maximum and minimum equilibrium speed to the mean equilibrium speed.

B

The ratio of the maximum speed to minimum speed with in the operating range

C

The ratio of the difference between the maximum and mean speed to that of minimum to mean speed

D

The range of variation of engine speed

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 48

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The value of c which makes the angle $$45^\circ$$ between $$\overline{a} = i + cj$$ and $$\overline{b} = i + j$$ is

A

$$1$$

B

$$\frac {1}{\sqrt2}$$

C

$$\frac {-1}{\sqrt2}$$

D

$$0$$

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 49

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For traction applications, the type of motor best suited is

A

Induction motor

B

Synchronous motor

C

DC shunt motor

D

DC series motor

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 50

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In simple harmonic motion the acceleration is proportional to

A

Displacement

B

Linear velocity

C

Angular velocity

D

Rate of change of angular velocity

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 51

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A vibro meter

A

Indicates vibration aplitude

B

Indicates vibration frequency

C

Indicates mature of vibrations

D

Only indicates second and above harmonics

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 52

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At node of the shaft

A

The vibrations are minimum

B

The vibrations are maximum

C

The vibrations are average

D

The vibrations are zero

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ISRO Scientist or Engineer Mechanical 2010 - Question 53

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Match list I with list II and select the correct answer using the codes. given below the lists.

A

A-4, B-2, C-1, D-3

B

A-3, B-4, C-2, D-5

C

A-5, B-4, C-2, D-3

D

A-3, B-2, C-1, D-5

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 54

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The cutting speed of the tool in a mechanical shaper is

A

Maximum at the beginning of the cutting stroke

B

Maximum at the end of the cutting stroke

C

Maximum at the middle of the cutting stroke

D

Minimum at the middle of the cutting stroke

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 55

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Which is not correct statement about the function of flux in brazing

A

To avoid thermal distortion and cracking

B

To dissolve surface oxide coatings which have formed prior to brazing

C

To prevent oxides from forming during the brazing operation on both the base metal and the brazing material

D

To facilitate the wetting process by reducing the viscosity of the melt

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 56

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Investment casting is used for

A

Shapes which are made by difficulty using complex patterns in sand casting

B

Mass production

C

Shapes which are very complex and intricate and can’t be cast by any other method

D

There is nothing like investment casting

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 57

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Internal and external threads can be produced on tapered surfaces conveniently by

A

Universal milling machine

B

Plano miller

C

Planetary milling machine

D

lathe

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 58

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Optical square is

A

Engineer’s square having stock and blade set at $$90^\circ$$

B

A constant deviation prism having the angle of deviation between the incident ray and reflected ray, equal to $$90^\circ$$

C

A constant deviation prism having the angle of deviation betweenthe incident ray and reflected ray, equal to $$45^\circ$$

D

Used to produce interference fringes

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 59

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A master gauge is

A

A new gauge

B

An international reference standard

C

A standard gauge for checking accuracy of gauges used on shop floors

D

A gauge used by experienced technicians

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ISRO Scientist or Engineer Mechanical 2010 - Question 60

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Dimension of the hole is $$50_{-0.00}^{+0.02} mm $$ and shaft is $$50_{+0.00}^{+0.02} mm. $$ The minimum clearance is

A

0.02 mm

B

0.00 mm

C

-0.02 mm

D

0.01 mm

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 61

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Two cutters are mounted on the arbor so that two faces are machined simultaneously in

A

Gang milling

B

Straddle milling

C

Pendulum milling

D

Profile milling

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 62

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The main alloying elements in high speed steel in order of increasing proportion are

A

Vanadium, chromium,tungsten

B

Tungsten,titanium, vanadium

C

Chromium,titanium, vanadium

D

Tungsten, chromium,titanium

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 63

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Surface roughness on a drawing is represented by

A

Triangles

B

Circles

C

Squares

D

Rectangles

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ISRO Scientist or Engineer Mechanical 2010 - Question 64

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A husband and wife appearin an interview for two vacancies for same post. The probability of husband getting selected is $$\frac {1}{5}$$ while the probability of wife getting selected is $$\frac {1}{7}$$. Then the probability that anyone of them getting selected is

A

$$\frac {11}{35}$$

B

$$\frac {12}{35}$$

C

$$\frac {1}{35}$$

D

$$\frac {34}{35}$$

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 65

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Cylindrical parts are held on planer by

A

V-blocks and arrestors

B

Angle plates

C

V-block, T-bolts and clamps

D

T-bolt and clamps

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ISRO Scientist or Engineer Mechanical 2010 - Question 66

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Expressing a dimension as $$25.3^{\pm 0.05} mm is the case of

A

Unilateral tolerance

B

Bilateral tolerance

C

Limiting dimensions

D

All of the above

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ISRO Scientist or Engineer Mechanical 2010 - Question 67

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In comparison to an open-loop system a closed loop system is

A

More stable

B

More accurate

C

More complex

D

All of the above

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ISRO Scientist or Engineer Mechanical 2010 - Question 68

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The Moody diagram is shown in Fig. The friction factor for turbulent flow in a smooth pipe is given by curve

A

A

B

B

C

C

D

D

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 69

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A piping system consists of three pipes arranged in series, the lengths of the pipes are 1200m, 750 m and 600 m and diameters 750 mm, 600 mm, 450 mm respectively. Transform the system to an equivalent 450 mm diameter pipe

A

671.3m

B

771.3m

C

871.3m

D

971.3m

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 70

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Friction drag is generally larger than the pressure drag in

A

Flow past a sphere

B

Flow past a thin sheet

C

Flow past an airfoil

D

Flow past a cylilnder

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ISRO Scientist or Engineer Mechanical 2010 - Question 71

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If D is the diameter of impeller at inlet, w is the width of impeller at inlet and $$V_f$$ is the velocity of flow at inlet, then discharge through a centrifugal pump is equalto

A

$$\pi DV_f$$

B

$$DV_f w$$

C

$$\pi DV_f w$$

D

$$\pi Dw$$

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 72

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Cavitation parameter is defined by

A

$$\frac {P_v - P}{\frac {\rho V^2}{2}}$$

B

$$\frac {P_atm - P_v}{\frac {\rho V^2}{2}}$$

C

$$\frac {P - P_atm}{\frac {\rho V^2}{2}}$$

D

$$\frac {P - P_v}{\frac {\rho V^2}{2}}$$

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 73

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The maximum thickness of boundary layerin a pipe of radius R is

A

0.1 R

B

0.22 R

C

0.5 R

D

R

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ISRO Scientist or Engineer Mechanical 2010 - Question 74

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At a point A in a pipe lilne carrying water, the diameter is 1 m, the pressure 98 KPa and the velocity 1 m/s. At a point B, 2 m higher than A, the diameter is 0.5m and the pressure 20 KPa. The direction of flow would be

A

A to B

B

B to A

C

Cannot be ascertained from data

D

None of these

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 75

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In the given figure pressure p in kPa, is

A

37

B

48.0

C

45.2

D

51.3

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ISRO Scientist or Engineer Mechanical 2010 - Question 76

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

A

Rise

B

Fall

C

Not change

D

Rise then fall

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ISRO Scientist or Engineer Mechanical 2010 - Question 77

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Four cars, with a mass of 1500 kg each, are loaded on a 6 m wide, 12 m long small car ferry. How far, in cm will it sink in the water?

A

15.2

B

11.5

C

10.2

D

8.3

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 78

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Water enters a turbine at 900kPa with negligible velocity. What maximum speed, in m/s, can it reach before it enters the turbine rotor?

A

42

B

47

C

45

D

52

View Solution

ISRO Scientist or Engineer Mechanical 2010 - Question 79

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Given that:
Specific gravity of mercury = 13.6;
Intensity of pressure = 40kPa
Express the intensity of pressure (gauge) in various units (S.I)

A

0.3 bar, 3.077 m of water, 0.15 m of mercury

B

0.4 bar, 4.077 m of water, 0.299 m of mercury

C

0.5 bar, 5.077 m of water, 0.339 m of mercury

D

None of the above

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ISRO Scientist or Engineer Mechanical 2010 - Question 80

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The differential equation satisfying $$y = Ae^{3x} + Be^{2x}$$ is

A

$$\frac {d^2y}{dx^2} + 5\frac{dy}{dx} - 6y = 0$$

B

$$\frac {d^2y}{dx^2} - 5\frac{dy}{dx} + 6y = 0$$

C

$$\frac {d^2y}{dx^2} + 5\frac{dy}{dx} + 6y = 0$$

D

$$\frac {d^2y}{dx^2} - 5\frac{dy}{dx} - 6y = 0$$

View Solution