In a band brake the ratio of tight side band tension to the tension on the slack side is 3. If the angle of overlap of band on the drum is 180° the coefficient of friction required between drum and the band is

1.  0.20

2.  0.25

3.   0.30

4.  0.35

View Answer  
4
Correct Answer :

0.35


Explanation :
No Explanation available for this question

A water container is kept on a weighting balance. Water from a tap is falling vertically into the container with a volume flow rate of Q; the velocity of the water when it hits the water surface is U. At a particular instant of time the total mass of the container and water is m. the force registered by the weighing balance at this instant of time is

1.  mg + pQU

2.  mg + 2p QU

3.  mg + pQU2/2

4.  pQU2/2

View Answer  
4
Correct Answer :

mg + pQU


Explanation :
No Explanation available for this question

In a counter flow heat exchanger, for the hot fluid the heat capacity = 2k]/kg K, mass flow rate = 5 kg/s, inlet temperature = 150°C, outlet temperature = 100°C. for the cold fluid, heat capacity = 4 kJ/kg K, mass flow rate = 10 kg/s, inlet temperature=20°C. Neglecting heat transfer to the surroundings, the outlet temperature of the cold fluid in °C is

1.  7.5

2.  32.5

3.   45.5

4.  70.0

View Answer  
4
Correct Answer :

32.5


Explanation :
No Explanation available for this question

Air flows through a venturi and into atmosphere. Air density is p; atmospheric pressure is Pa; throat diameter is D exit diameter is D and exit velocity is U. the throat is connected to a cylinder containing a frictionless piston attached to a spring. The spring constant is k. the bottom surface of the piston is exposed to atmosphere. Due to the flow, the piston moves by distance x. assuming incompressible friction less flow, x is

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

Match the following Work Material Type of Joining P. Aluminium 1. Submerged Arc Welding Q. Die Steel 2. Soldering R. copper wire 3. Thermit Welding S. Titanium Sheet 5. Gas Tungsten Arc Welding   6. Laser Beam Welding  

1.  P-2 Q-1 R-7 S-6

2.  P-3 Q-1 R-5 S-7

3.  P-1 Q-3 R-1 S-5

4.  P-3 Q-4 R-7 S-6

View Answer  
4
Correct Answer :

P-3 Q-4 R-7 S-6


Explanation :
No Explanation available for this question

is equal to

1.  0

2.  -1

3.   1

4.  none

View Answer  
4
Correct Answer :

1


Explanation :
No Explanation available for this question

The linear acceleration of the reel is

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

the tension in the thread is

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

Considering the relationship TdS=dU+pdV between the entropy (S), internal energy (U), pressure (p), temperature (T) and volume (V), which of the following statements is correct

1.  It is applicable only for a reversible process

2.  For an irreversible process, TdS > dU + pdV

3.  It is valid only for an ideal gas

4.  It is equivalent to 1 law, for a reversible process

View Answer  
4
Correct Answer :

It is equivalent to 1 law, for a reversible process


Explanation :
No Explanation available for this question

In a gas turbine, hot combustion products with the specific heats C = 0.98 kJ/kgK, C=0.7538 kJ/kg K enter the turbine at 20 bar, 1500 K and exit at 1 bar. The isentropic efficiency of the turbine is 0.94. The work developed by the turbine per kg of gas flow is

1.  689.64 kJ/kg

2.    794.66 kJ/kg

3.  1009.72 kJ/kg

4.  1312.00 kJ/kg

View Answer  
4
Correct Answer :

689.64 kJ/kg


Explanation :
No Explanation available for this question
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