ISRO Scientist or Engineer Mechanical 2008

ISRO Scientist or Engineer Mechanical 2008 - Question 1

Report

The ultimate tensile strength and yield strength of most of the metals, when temperature falls from $$0$$ to $$-150^\circ C$$ will

A

Increase

B

Decrease

C

Remain same

D

First increase and then decrease

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 2

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“Troosite” is obtained when

A

Quenching steel during transformation

B

A fully hardenedsteel is finally drawn at about $$677^\circ C$$

C

Steel is rapidly quenchedin oil

D

When alloy steels are rapidly quenched in water

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 3

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Induction hardening is the process of

A

Hardening the core

B

Uniform hardening

C

Selective hardening

D

Hardening surface for wear resistance

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 4

Report

Heavy water is used in atomic powerplants as

A

Fuel

B

Source of energy

C

Lubricant

D

Moderator

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 5

Report

Which one is not the purpose of heat treatmentof steels?

A

Changing the composition of steel on the surface

B

Changing the percentage of carbon and Si in the bulk

C

Increasing or decreasing the grain size

D

Removing undesirable residual stresses

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 6

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A cold chisel is made of

A

Mild steel

B

Cast iron

C

H.S.S

D

High carbon

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 7

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A body which is permanently deformedis said to have undergone

A

Elastic deformation

B

Limit of elastic deformation

C

Plastic deformation

D

Uniform deformation

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 8

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The defect responsible for the phenomenaofslip, by which most metals deform plastically, is known as

A

Fracture

B

Twinning

C

Dislocation

D

Strain hardening

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 9

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

A

$$\frac{1}{4} \times$$ Thickness of plate

B

$$\frac{1}{2} \times$$ Thickness of plate

C

Plate thickness

D

$$2 \times$$ Plate thickness

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 10

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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 2008 - Question 11

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On loading a ductile material in excess of a certain value, gradual increase in elongation occurs with time. Such phenomenon is known as

A

Creep

B

Fatigue

C

Stress concentration

D

None of the above

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 12

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The failure occurs at a point in a member, when the maximum shear stress in a bi-axial stress system reaches the shearstress at elastic limit in simple tension test, This is according to

A

Rankine’s theory

B

Guest’s theory

C

Lame’s theory

D

None of the above

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 13

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The function of a washer is

A

To fill the axial gap

B

To provide cushioning effect

C

To absorb shocks and vibrations

D

To provide bearing area

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 14

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Surface endurance limit of gear material depends on its

A

Surface hardness

B

Modulusof elasticity

C

Elastic strength

D

All of the above

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 15

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A double strap butt joint is always in

A

Single shear

B

Double shear

C

Either single or double shear

D

None of the above

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 16

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If $$y = \tan^{-1}\frac{2x}{1 - x^2}$$, then $$\frac{dy}{dx}$$ is

A

$$\frac{2}{1 + x^2}$$

B

$$\frac{2}{1 - x^2}$$

C

$$\frac{1}{1 + x^2}$$

D

$$\frac{2x}{\sqrt{1 + x^2}}$$

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 17

Report

Rivets are made of

A

Soft material

B

Hard material

C

Ductile material

D

Brittle material

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 18

Report

The purpose of providing multiple collars on a flat collar pivot bearingis to

A

Increase frictional resistance

B

To establish self — sustaining bearing conditions

C

Distribute the frictional load because of limiting friction

D

Distribute the axial load because of limiting bearing pressure on a collar

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 19

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Angle of dwell of cam is defined as the angle

A

during which the follower returns to its initial position

B

of rotation of the cam for definite displacement of the follower

C

through which the cam rotates during the period in which the follower remainsin the highest position

D

moved by the cam from the instant the follower begins to rise, till it reaches its highest position

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 20

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The supply of working fluid to the engine to suit the load conditions is controlled by

A

Meyer’s expansion valve

B

D-slide valve

C

Governor

D

Throttle valve

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 21

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A pantograph is a device that reproduces a displacement

A

On the same scale

B

On any scale

C

On reduced scale

D

On enlarged scale

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 22

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In the case of gyroscopic effect, the planes of spin, gyroscopic couple and precession are

A

In same plane

B

In different planes

C

Any two in perpendicular planes and third in different plane

D

Mutually perpendicular

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 23

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Which of the following is a lower pair?

A

Piston and cylinder

B

Cam and follower

C

Belt drive

D

Gear

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 24

Report

Match List-I (measuring Devices) with List-IJ (Measuring parameter) and select the correct answer using the codes given below the lists

A

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

B

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

C

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

D

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

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 25

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The following data pertain to a worker: base rate = Rs. 20 per hour
Time taken for completing the job =2 hours
Standard time = 3hours
Under Halsey plan the total earning of the worker is

A

Rs. 36.67

B

Rs. 40.67

C

Rs. 46.67

D

Rs. 56.57

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 26

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What is the correct sequenceof the following parameters in order of their maximum to
minimum influence on toollife?
1. Feed rate
2. Depth of cut
3. Cutting speed
Select the correct answer using the codes given below

A

1, 2, 3

B

3, 2, 1

C

2, 3, 1

D

3, 1, 2

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 27

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Given that cutting speed =9 m/min, the return time to cutting time ratio is = 1:2 the feed rate = 0.3 mm/stroke , the clearanceat each of cut = 25 mm and that the plate Is fixed 700 mm side along the direction of tool travel, the time required for finishing one flat surface of a plate of size 700 $$\times$$ 300 mm in a shaper, will be

A

10 min

B

12.5 min

C

15 min

D

20 min

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 28

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The least count of a metric vernier caliper having 25 divisions on vernier scale , matching with 24 divisions of main scale (1 main scale divisions= 0.5 mm )is

A

0.005 mm

B

0.01 mm

C

0.02 mm

D

0.05 mm

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 29

Report

Standards to be used for reference purposes in laboratories and workshops are termed as

A

Primary standards

B

Secondary standards

C

Tertiary standards

D

Working standards

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 30

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For achieving a specific surface finish in single point turning the most important factor to be controlled is

A

Depth of cut

B

Cutting speed

C

Feed

D

Tool rake angle

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 31

Report

Interchangeability can be achieved by

A

Standardisation

B

Better process planning

C

Simplification

D

Better product planning

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 32

Report

The centre and radius of the circle $$z\overline{z} - (2 + 3i)z - (2 - 3i)\overline{z} + 9 = 0$$ are

A

(2, 3), 2

B

(2, -3), 2

C

(2, 3), $$\sqrt{2}$$

D

(2, -3), $$\sqrt{2}$$

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 33

Report

Enlarging an existing circular hole with rotating single point toolis called

A

Boring

B

Drilling

C

Reaming

D

Internal turning

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 34

Report

Plug gauges are used to

A

Measure the diameter of the workpieces

B

Measure the diameterofthe holes in the workpieces

C

Check the diameter of the holes in the workpieces

D

Check the length of holes in the workpieces

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 35

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Basic shaft and basic hole are those whose upper deviations and lower deviations respectively - are

A

+ve, -ve

B

-ve, +ve

C

Zero, Zero

D

None of the above

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 36

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The general equation of continuity for three-dimensional flow of a compressible fluid for steady flow is (where u, v, w are components of velocity in x, y and z directions respectively)

A

$$\frac{\partial u}{\partial x} + \frac{\partial v}{\partial y} + \frac{\partial w}{\partial z} = 0$$

B

$$\frac{\partial u}{\partial x} = \frac{\partial v}{\partial y} = \frac{\partial w}{\partial z} = 0$$

C

$$\frac{\partial u}{\partial x} + \frac{\partial v}{\partial y} + \frac{\partial w}{\partial z} = 1$$

D

$$\frac{\partial u}{\partial x} + \frac{\partial v}{\partial y} + \frac{\partial w}{\partial z} = u.v.w$$

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 37

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The density of air at $$10^\circ C$$ and 1MPa abs,in SI units is

A

1.231

B

12.31

C

118.4

D

65.0

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 38

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In centrifugal pumps, maximum efficiency is obtained when the blades are

A

Straight

B

Bent forward

C

Bent backward

D

radial

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 39

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If the characteristics of a pump are as shown in fig. What is represented by abscissa

A

Head

B

RPM

C

Discharge

D

Power

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 40

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A rocket exists exhaust gases with $$\rho = 0.5 kg/m^3$$ out a 50 cm diameter nozzle at a velocity of 1200 m/s The thrust, is

A

420 kN

B

280 kN

C

140 kN

D

90 kN

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 41

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Which of the following pairs of velocity components u and v satisfy the continuity equation for a two dimensional flow of an incompressible fluid?

A

$$u = (2x^2 + 3y^3); v = -3xy$$

B

$$u = (3x - y); v = (2x + 3y)$$

C

$$u = A \sin xy; v = -A \sin xy$$

D

$$u = cx; v = -cy$$

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 42

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The flow of a fluid in a pipe takes place from

A

Higher level to lower level

B

Small end to large end

C

Higher pressure to lower pressure

D

Higher energy to lower energy

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 43

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An aeroplane is flying at an height of 14 km where temperature is $$-45^\circ C$$. The speed of the plane is corresponding to M = 2. Find the speed of the plane if R = 287 J/kg K and $$\gamma = 1.4$$.

A

2179 km/h

B

3010 km/h

C

3250 km/h

D

3379 km/h

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 44

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Pipe 1, branches to three pipes as shown in the given figure. The areas and corresponding velocities are as given in the following table The value of $$V_2$$ in cm per second will be

A

15

B

20

C

30

D

35

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 45

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The pressure difference measured by a mercury oil differential manometer on the two sides of the orifice meter gives a reading of 50 cm of mercury. Determine the differential pressure head in orifice. Take the specific gravity ofoil as 0.9.

A

7.05 m of oil

B

5.05 m of oil

C

4.75 m of oil

D

3.35 m of oil

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 46

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The transition Reynolds numberfor flow over flat plate is $$5 \times 10^5$$. What is the distance from the leading edge at which transition will occur for flow of water with a uniform velocity of 1m/s?(For water, the kinematic viscosity, $$v = 0.858 \times 10^{-6} m^2/s$$)

A

1 m

B

0.43 m

C

43 m

D

103 m

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 47

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Pipes of lengths $$l_1, l_2$$ etc and diameter $$d_1, d_2$$, etc are connectedin series. A single pipe of length $$l_1 + l_2 + l_3 + ....$$ having same pressure loss as all pipes in series will have diameter equal to

A

$$\left(\frac{l_1 + l_2 + l_3 + ....}{\frac{l_1}{d_1^4} + \frac{l_2}{d_2^4} + ......}\right)^{\frac{1}{4}}$$

B

$$\left(\frac{l_1 + l_2 + l_3 + ....}{\frac{l_1}{d_1^5} + \frac{l_2}{d_2^5} + ......}\right)^{\frac{1}{5}}$$

C

$$\left(\frac{l_1 + l_2 + l_3 + ....}{\frac{l_1}{d_1^3} + \frac{l_2}{d_2^3} + ......}\right)^{\frac{1}{3}}$$

D

$$\left(\frac{l_1 + l_2 + l_3 + ....}{\frac{l_1}{d_1^2} + \frac{l_2}{d_2^2} + ......}\right)^{\frac{1}{2}}$$

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 48

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Let x have the density function $$f(x) = \begin{cases}\frac{3}{4}(1 - x^2) & if -1 \leq x \leq 1\\0 & otherwise \end{cases}$$. Then the probability $$p\left(\frac{-1}{2} \leq x \leq \frac{1}{2}\right)$$ is

A

68.75%

B

31.36%

C

95%

D

60.7%

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 49

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If thermal conductivity of a material varies as $$K_o(1 + \alpha T)$$, temperature at the center of a 10 cm thick wall of material will be

A

Average of the temperature at two ends of the wall

B

More than the average of the temperature at two ends of the wail

C

Less than the average of the temperature at two ends of the wall

D

Depends on the range of temperature

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 50

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What is the net radiant interchange per square meter for two very large plates at temperatures 800 K and 500 K respectively? (The emissivity of the hot and cold plates are 0.8 and 0.6 respectively. Stefan Boltzmann constant is $$5.67^* 10^{-8} W/m^2 K^4$$).

A

$$10.26 \frac{kW}{m^2}$$

B

$$1.026 \frac{kW}{m^2}$$

C

$$102.6 \frac{kW}{m^2}$$

D

$$1026 \frac{kW}{m^2}$$

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 51

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A 10 kg solid at $$100^\circ C$$ with a specific heat, of 0.8kJ/kg. $$^\circ C$$ is immersed in 40 kg of $$20^\circ C$$ liquid with a specific heat of 4.0 kJ/kg $$^\circ C$$. Estimate the temperature after a long time if the container is insulated?

A

$$30^\circ C$$

B

$$28^\circ C$$

C

$$26^\circ C$$

D

$$24^\circ C$$

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 52

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A spherical shaped vessel of 1.4 m outer diameter is 90 mm thick. Find the rate of heat leakage, if the temperature difference between the inner and outer surfaces is $$220^\circ C$$. Thermal conductivity of the material of the sphere is 0.083 W/m K.

A

0.2 kW

B

0.5 kW

C

1.088 kW

D

1.6 kW

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 53

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$$\left(\frac{\partial p}{\partial V}\right)_T \left(\frac{\partial v}{\partial T}\right)_p \left(\frac{\partial T}{\partial p}\right)_v$$ is equal to

A

Zero

B

1

C

-1

D

Infinity

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 54

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A well insulated vessel containing air is heated to double the pressure and temperature 150% in excess of initial. The amount of air that leaked is

A

20%

B

22.5%

C

25%

D

0%

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 55

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An unconstraint thin circular disc has a concentric hole in it. On heating the diameter of the hole will

A

increase

B

decrease

C

Remain constant

D

first increase then decrease

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 56

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The specific heat of diatomic gas at constant pressure is given by (R = universal gas constant and M = molecular weight of gas)

A

$$\frac{5}{2} \frac{R}{M}$$

B

$$\frac{5}{2} MR$$

C

$$\frac{7}{2} \frac{R}{M}$$

D

$$\frac{7}{2} MR$$

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 57

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The variation of temperature inside a wall is shown by three different curves. In which case thermal conductivity least varies with temperature

A

A

B

B

C

C

D

Cannot be ascertained on the basis of information provided

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 58

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Kinetic energy of the molecules in terms of absolute temperature (T) is proportional to

A

T

B

$$T^4$$

C

$$T^2$$

D

$$\sqrt{T}$$

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 59

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Which type of heat exchanger an automobile radiator is?

A

Parallel flow type

B

Counter flow type

C

Regenerator type

D

Cross flow type

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 60

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Given that Nu = Nusselt number, Re = Reynoids number, Pr = Prandtl number, Sh = Sherwood number, Sc = Schmidt number and Gr = Grashoff number. The functional relationship for free convective heat transfer is given as,

A

Nu = f(Gr, Pr)

B

Sh = f(Sc, Gr)

C

Nu = f(Re, Pr)

D

Sh = f(Re, Sc)

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 61

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The quantity of heat required to change the temperature of 1 gm of ice from $$—6^\circ C$$ to $$—5^\circ C$$ is known as

A

Latent heat of freezing

B

Freezing heat

C

Heat of vaporization

D

Specific heat

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 62

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The spectral energy distribution for a body at temperature T is shown in figure. Now if the temperature of the body is increased

A

$$\lambda_m$$ Will shift towards right

B

$$\lambda_m$$ will shift towards left

C

The total energy emitted by the body will decrease

D

$$\lambda_m$$ will remain the same but $$E_m$$ will increase

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 63

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When K is the thermal conductivity, $$\tau$$ is the density and $$C_p$$, is the specific heat of a substance, then thermaldiffusivity is given by

A

$$\frac{K}{\tau.C_p}$$

B

$$\frac{K.C_p}{\tau}$$

C

$$\frac{\tau.C_p}{K}$$

D

$$\frac{K.\tau}{C_p}$$

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 64

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The determinant of the matrix $$\begin{bmatrix}7 &0 & 0 & 0 \\9 & 3 & 0 & 0 \\4 & -6 & -2 & 0 \\0 & 0 & 0 & 1 \end{bmatrix}$$ is

A

0

B

1

C

-42

D

-68

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 65

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A thin copper wire at $$300^\circ$$ is suddenly immersed in water at $$30^\circ C$$. It cools down to $$150^\circ C$$ in 70 seconds. It is then reheated to the initial temperature of $$300^\circ C$$ and suddenly exposedto air at $$30^\circ C$$ whereit cools down to $$150^\circ C$$ in 200 seconds. This difference in cooling time is due to

A

Larger specific heat of water

B

Larger heat transfer coefficient in water

C

Smaller heat transfer coefficient in water

D

None of the above

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 66

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A heavy block of mass m is slowly placed on a conveyer belt moving with speed v. If coefficient of friction between block and the belt is $$\mu$$, the block will slide on the belt through distance

A

$$\frac{v}{\mu g}$$

B

$$\frac{v^2}{\sqrt{\mu g}}$$

C

$$\left(\frac{v}{\mu g}\right)^2$$

D

$$\frac{v^2}{2 \mu g}$$

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 67

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A car moving with speed u can be stopped in minimum distance x when brakes are applied. If the speed becomes n times, the minimum distance over which the car can be stopped would take the value

A

$$\frac{x}{n}$$

B

nx

C

$$\frac{x}{n^2}$$

D

$$n^2x$$

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 68

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Speed of particle executing simple harmonic motion with amplitude a is half of the maximum speed. At that instant, displacement of the particle is

A

$$\frac{a}{2}$$

B

$$\frac{\sqrt{3}}{2} a$$

C

$$\frac{2a}{\sqrt{3}}$$

D

$$3 \sqrt{2} a$$

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 69

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Two blocks with masses M and mare in contact with each other and are resting on a_ horizontal frictionless floor. When horizontal force is applied to the heavier, the blocks accelerate to the right. The force between the two blocks are

A

$$\frac{(M + m)F}{m}$$

B

$$\frac{MF}{m}$$

C

$$\frac{mF}{M}$$

D

$$\frac{mF}{(M + m)}$$

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 70

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A stone of mass m at the end of a string of length | is whirled in a vertical circle at a constant speed. The tension in the string will be maximum when the stone is

A

At the top of the circle

B

Half-way down from the top

C

Quarter-way downfrom the top

D

At the bottom of the circle

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 71

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Ratio of the radii of the planets $$P_1$$, and $$P_2$$, is k and ratio of the accelerations due to gravity on them is s. Ratio of escape velocities from them will be

A

$$ks$$

B

$$\sqrt{ks}$$

C

$$\sqrt{\frac{k}{s}}$$

D

$$\sqrt{\frac{s}{k}}$$

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 72

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Couple M is applied at C on a simply supported beam AB. The maximum shear on AC will be

A

Zero

B

M

C

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

D

$$\frac{M}{3}$$

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 73

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A short column of external diameter D and internal diameter d, is subjected to a load W, with an eccentricity e, causing zero stress at an extremefiber. Then the value of ‘e’ must be

A

$$\frac{D^2 + d^2}{8 \pi D}$$

B

$$\frac{D^2 + d^2}{8D}$$

C

$$\frac{D^2 - d^2}{8D}$$

D

$$\frac{D^3 - d^3}{8D^2}$$

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 74

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A beam AB is hinge-supported at its ends and is loaded by couple P.c. as shown in the figure. The magnitude of shearing force at a section x of the beam is

A

0

B

P

C

$$\frac{P}{2L}$$

D

$$\frac{P.c}{2L}$$

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 75

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There are two bars of equal length and equal volume and same material, one having stepped diameters and other having uniform diameter. If maximum stress produced in both bars is
same, then stored energy will be

A

More in stepped diameter shaft

B

More in uniform diameter shaft

C

Equal in both

D

Depend on other factors

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 76

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The given figure shows the shear force diagram for the beam ABCD. Bending moment in the portion BC of the beam

A

Is anon-zero constant

B

Is zero

C

Varies linearly from B to C

D

Varies parabolically from B to C

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 77

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$$\sigma_x, \sigma_y$$ and $$\tau_{xy}$$ are the rectangular stress components at a point. The radius of Mohr’s circle is

A

$$\sqrt{\sigma_x^2 - \sigma_y^2 + \tau_{xy}^2}$$

B

$$\sqrt{\left(\frac{\sigma_x + \sigma_y}{2}\right)^2+ \tau_{xy}^2}$$

C

$$\sqrt{\sigma_y^2 - \sigma_x^2 + \tau_{xy}^2}$$

D

$$\sqrt{\frac{(\sigma_y - \sigma_x)^2}{2}+ \tau_{xy}^2}$$

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 78

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For the case of a slender column oflength Land flexural rigidity EI built in at its base and free at the top, the Eulers critical buckling load is

A

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

B

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

C

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

D

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

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 79

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When a beam is subjected to a transverse shearing force, the shear stress in the upper fibers will be

A

Maximum

B

Minimum

C

Zero

D

Depends on other data

View Solution

ISRO Scientist or Engineer Mechanical 2008 - Question 80

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Angle made by $$2i - 3j + 4k$$ with the z-axis is

A

$$\cos^{-1}\left(\frac{4}{\sqrt{29}}\right)$$

B

$$\frac{4}{\sqrt{29}}$$

C

$$\sin^{-1}\left(\frac{4}{\sqrt{29}}\right)$$

D

$$\tan^{-1}\left(\frac{4}{\sqrt{29}}\right)$$

View Solution