# 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

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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

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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.

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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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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

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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

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(&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

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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

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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

4

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

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