A long thin walled cylindrical shell, closed at both ends, is subjected to an internal pressure.  The  ratio  of  the  hoop  stress  (circumferential  stress)  to  longitudinal stress developed in the shell is

1.  0.5

2.  1.0

3.  2.0

4.  4.0

View Answer  
4
Correct Answer :

2.0


Explanation :
No Explanation available for this question

If two nodes are observed at a frequency of 1800 rpm during whirling of a simply supported long slender rotating shaft, the first critical speed of the shaft in rpm is

1.  200

2.  450

3.  600

4.  900

View Answer  
4
Correct Answer :

900


Explanation :
No Explanation available for this question

A planar closed kinematic chain is formed with rigid links PQ = 2.0m, QR = 3.0m, RS = 2.5m and SP = 2.7m with all revolute joints. The link to be fixed to obtain a double rocker (rocker-rocker) mechanism is

1.  PQ

2.  QR

3.  RS

4.  SP

View Answer  
4
Correct Answer :

RS


Explanation :
No Explanation available for this question

Let X be a nominal variable with mean 1 and variance 4. The probability  P(X

1.   0.5

2.  Greater than zero and less than 0.5

3.  Greater than 0.5 and less than 1

4.  1.0

View Answer  
4
Correct Answer :

Greater than zero and less than 0.5


Explanation :
No Explanation available for this question

Choose the CORRECT set of functions, which are linearly dependent

1.  Sinx, sin2x and cos2x

2.  cosx, sinx and tan x

3.  cos2x, sin2x and cos2x

4.  cos2x, sinx and cosx

View Answer  
4
Correct Answer :

cos2x, sin2x and cos2x


Explanation :
No Explanation available for this question

The  following  surface  integral  is  to  be  evaluated  over  a  sphere  for  the  given steady  velocity  vector  field,  F=xi+yj+zk defined  with  respect  to  a  Cartesian coordinate system having i, j, and k as unit base vectors Where S is the sphere, x2+y2+z2=1 and n is the outward unit normal vector to the sphere. The value of the surface integral is

1.  Π

2.  2π

3.  3π/4

4.  4π

View Answer  
4
Correct Answer :

Π


Explanation :
No Explanation available for this question

The function f(t) satisfies the differential equation d2f/dt2+f=0 and  the  auxiliary conditions, f(0)=0, df/dt(0)=4.  The Laplace transform of   f(t) is given by

1.  2/s+1

2.  4/s+1

3.  4/s2+1

4.  2/s4+1

View Answer  
4
Correct Answer :

4/s2+1


Explanation :
No Explanation available for this question

Specific  enthalpy  and  velocity  of  steam  at  inlet  and  exit  of  a  steam  turbine running under steady state, are as given below                                                     Specific enthalpy (kJ/kg)   Velocity(m/s)   Inlet steam condition                         3250                            180   Exit steam condition                         2360                              5 The  rate  of  heat  loss  from  the  turbine  per  kg  of  steam  flow  rate  is  5  kW. Neglecting changes  in potential energy of steam, the power developed  in kW by the steam turbine per kg of steam flow rate, is

1.  901.2

2.  911.2

3.  17072.5

4.  17082.5

View Answer  
4
Correct Answer :

17072.5


Explanation :
No Explanation available for this question

Water  is  coming  out  from  a  tap  and  falls  vertically  downwards.    At  the  tap opening,  the  stream  diameter  is  20mm  with  uniform  velocity  of  2  m/s. Acceleration  due  to  gravity  is  9.81m / s2 .  Assuming  steady,  inviscid  flow, constant atmospheric pressure everywhere and neglecting curvature and surface tension  effects,  the  diameter  is  mm  of  the  stream  0.5m  below  the  tap  is approximately

1.  10

2.  15

3.  20

4.  25

View Answer  
4
Correct Answer :

15


Explanation :
No Explanation available for this question

A steel ball of diameter 60 mm  is  initially  in  thermal equilibrium at  1030 0 C in a furnace.  It  is  suddenly  removed  from  the  furnace  and  cooled  in  ambient  air  at 30 0 C ,  with  convective  heat  transfer  coefficient  h=20 W/m2K. The  thermo-physical  properties  of  steel  are:  density 7800 kg /m3, conductivity k=40 w/mk and specific heat c=600 j/Kgk. The time required in seconds to cool the steel ball in air from 1030 0 C to  430 0 C  is

1.  519

2.  931

3.  1195

4.  2144

View Answer  
4
Correct Answer :

2144


Explanation :
No Explanation available for this question
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