Outside micrometer is calibrated with the help of

1.   inside micrometer

2.  depth micrometer

3.  ring gages

4.  slip gages

View Answer  
4
Correct Answer :

slip gages


Explanation :
No Explanation available for this question

In mass manufacturing, two holes in a plate type of component are ideally located with the help of

1.  one solid pin in the larger hole and one diamond pin in the smaller hole

2.  two solid pins in either holes

3.  two diamond pins in either holes

4.  one solid pin in the smaller hole and one diamond pin in the larger hole

View Answer  
4
Correct Answer :

two diamond pins in either holes


Explanation :
No Explanation available for this question

A pipe carrying saturated steam is covered with a layer of insulation and exposed to ambient air. The thermal resistances are as shown in the following figure. Which one of the following statements is correct in this regard

1.  Rsteam and Rpipe are negligible as compared to Rins and Rair

2.  Rpipe and Rair are negligible as compared to Rins and Rsteam

3.  Rsteam and Rair are negligible as compared to Rpipe and Rins

4.  No quantitative data is provided therefore no comparison is possible

View Answer  
4
Correct Answer :

Rsteam and Rpipe are negligible as compared to Rins and Rair


Explanation :
No Explanation available for this question

Consider the development of laminar boundary layer for a moving non-reacting fluid on contact with a flat plate of length ‘1’ along the flow direction. The average value of heat transfer coefficient can be obtained by multiplying the local heat transfer coefficient at the trailing edge by the factor

1.  0.75

2.  1.0

3.  1.5

4.  2.0

View Answer  
4
Correct Answer :

2.0


Explanation :
No Explanation available for this question

When there is a flow of fluid over a flat plate of length ‘1’, the average heat transfer coefficient is given by (Nux = local Nusselt number; other symbols have the usual meaning)

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

Boundary layer is defined as

1.  A thin layer at the surface where gradients of both velocity and temperature are small

2.  A thin layer at the surface where velocity and velocity gradients are large

3.  A thick layer at the surface where velocity and temperature gradients are large

4.  A thin layer at the surface where gradients of both velocity and temperature are large

View Answer  
4
Correct Answer :

A thin layer at the surface where gradients of both velocity and temperature are large


Explanation :
No Explanation available for this question

A fluid flowing over a flat plate has the following properties: Dynamic viscosity: 25 * 10-6 kg/ms Specific heat: 2.0 kJ/kg K Thermal conductivity: 0.05 W/mk The hydrodynamic boundary layer thickness is measured to be 0.5 mm. The thickness of thermal boundary layer would be

1.  0.1 mm

2.  0.5 mm

3.  1.0 mm

4.  None of these

View Answer  
4
Correct Answer :

0.5 mm


Explanation :
No Explanation available for this question

For a current carrying wire of 20 mm diameter exposed to air (h = 25 W/m2 K), maximum heat distribution (k = 0.5 W/m K) is

1.  20 mm

2.  10 mm

3.  1.5 mm

4.  0 mm

View Answer  
4
Correct Answer :

Explanation :
No Explanation available for this question

If ρ is density of substance S is specific heat and k is thermal conductivity, then thermal diffusivity (h) is equal to

1.  S/(ρ.k)

2.  ρk/S

3.  k/ρ.S

4.  ρ.S/k

View Answer  
4
Correct Answer :

k/ρ.S


Explanation :
No Explanation available for this question

Unit of thermal diffusivity is

1.  m/hr 0C

2.  m2/hr

3.  m/hr

4.  m2/hr 0C

View Answer  
4
Correct Answer :

m2/hr


Explanation :
No Explanation available for this question
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