The mechanism used in a shaping machine is

1.  a closed 4-bar chain having 4 revolute pairs

2.  a closed 6-bar chain having 6 revolute pairs

3.  a closed 4-bar chain having 2 revolute and 2 sliding pairs

4.  an inversion of the single slider-crank chain

View Answer  
4
Correct Answer :

a closed 4-bar chain having 2 revolute and 2 sliding pairs


Explanation :
No Explanation available for this question

The lengths of the links of a 4-bar linkage with revolute pairs only are p,q,r and s units.Given that p < q < r < s. which of these links should be the fixed one, for obtaining a ‘double crank’ mechanism

1.  link of length p

2.  link of length q

3.  link of length r

4.  link of length s

View Answer  
4
Correct Answer :

link of length s


Explanation :
No Explanation available for this question

Consider the arrangement shown in the figure below where J is the combined polar mass moment of inertia of the disc and the shafts. K1, K2, K3 are the torsional stiffness of the respective shafts. The natural frequency of torsional oscillation of the disc is given by

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

Maximum shear stress developed on the surface of a solid circular shaft under pure torsion is 240 MPa. If the shaft diameter is doubled then the maximum shear stress developed corresponding to the same torque will be

1.  120 MPa

2.  60 MPa

3.  30 MPa

4.  15 MPa

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4
Correct Answer :

30 MPa


Explanation :
No Explanation available for this question

A wire rope is designated as 6 x 19 standard hoisting. The numbers 6 x 9 represent

1.  diameter in millimeter x length in meter

2.  diameter in centimeter x length in meter

3.  number of strands x number of wires in each strand

4.  number of wires in each strand x number of strands

View Answer  
4
Correct Answer :

number of strands x number of wires in each strand


Explanation :
No Explanation available for this question

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

1.  &Rho:ghA

2.  (Ρs-Ρ)ghA

3.  (Ρ-Ρs)ghA

4.  (Ρh-ΡsH)ghA

View Answer  
4
Correct Answer :

(&Rho;h-&Rho;sH)ghA


Explanation :
No Explanation available for this question

A 2 kW, 40 litre water heater is switched on for 20 minutes. The heat capacity Cp for water is 4.2 kJ/kg K. Assuming all the electrical energy has gone into heating the water, increase of the water temperature in degree centigrade is

1.  2.7

2.  4.0

3.  14.3

4.  25.25

View Answer  
4
Correct Answer :

14.3


Explanation :
No Explanation available for this question

An industrial heat pump operates between the temperatures of 27°C and -13°C. The rates of heat addition and heat rejection are 750 W and 1000W, respectively. The COP for the heat pump is

1.  7.5

2.  6.5

3.  4.0

4.  3.0

View Answer  
4
Correct Answer :

4.0


Explanation :
No Explanation available for this question

A plate having 10 cm2  area each side is hanging in the middle of a room of 100m2 total surface area. The plate temperature and emissivity are respectively 800K and 0.6. the temperature and emissivity values for the surfaces of the room are 300K and 0.3 respectively. Boltzmann’s constant G=5.67x108 W/m2K4. The total heat loss from the two surfaces of the plate is

1.  13.66 W

2.  27.32 W

3.  27.87 W

4.  13.66 W

View Answer  
4
Correct Answer :

27.32 W


Explanation :
No Explanation available for this question

For air with a relative humidity of 80%

1.  the dry bulb temperature is less than the wet bulb temperature

2.  the dew point temperature is less than wet bulb temperature

3.  the dew point and wet bulb temperatures are equal

4.  the dry bulb and dew point temperatures are equal

View Answer  
4
Correct Answer :

the dew point temperature is less than wet bulb temperature


Explanation :
No Explanation available for this question
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