# 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

4

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

4

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

4

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.

4 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

4

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

4

1

Explanation :
No Explanation available for this question

# The linear acceleration of the reel is

1.

2.

3.

4.

4 Explanation :
No Explanation available for this question

# the tension in the thread is

1.

2.

3.

4.

4 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

4

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

4