# A Carnot cycle refrigerator operates between 250 K and 300 K. Its coefficient of performance is:

1.  6.0

2.  5.0

3.  1.2

4.   0.8

4

5.0

Explanation :
No Explanation available for this question

# In a pulverized-fuel-fired large power boiler, the heat transfer from the burning fuel to the walls of the furnace is

1.  by conduction only

2.  by convection only

3.  by conduction and convection

4

by conduction and convection

Explanation :
No Explanation available for this question

# A gas turbine power plant has a specific output of 350 kJ/kg and a n efficiency of 34%. A regenerator is instaIled and the efficiency increases to 51%. The specific output will be closest to

1.  350 kJ/kg

2.  468 kJ/kg

3.  525 kJ/kg

4.  700 kJ/kg

4

350 kJ/kg

Explanation :
No Explanation available for this question

# Kinematic viscosity of air at 20°C is given to be 1.6x 10-5m2/s. Its kinematic viscosity a t 70°C will be vary approximately

1.  2.2x 10-5m2/s

2.  1.6x 10-5m2/s

3.  1.2x 10-5m2/s

4.  10-5 x m2/s

4

2.2x 10-5m2/s

Explanation :
No Explanation available for this question

# Which of the following statements does NOT apply to the volumetric efficiency of a reciprocating air compressor

1.  It decreases with increase in inlet temperature

2.  It increases with decrease in pressure ratio

3.  It increases with decrease in clearance ratio

4.  It decreases with increase in clearance to stroke ratio

4

It decreases with increase in inlet temperature

Explanation :
No Explanation available for this question

# Ambient air dry-bulb temperature is 45°C and wet bulb temperature is 27°C. Select the lowest possible condensing temperature from the following for a nevaporatively cooled condenser.

1.  25°C

2.  30°C

3.  42°C

4.  48°C

4

48°C

Explanation :
No Explanation available for this question

# Identify the stress-state in the FLANGE portion of a PARTIALLY DRAWN CYLINDRICAL CUP when deep - drawing without a blank holder

1.  Tensile in aIl three directions

2.  No stress in the flange at aIl , because there is no blank - holder

3.  Tensile stress in one direction and compressive in the other direction

4.  Compressive in two directions and tensile in the third direction

4

No stress in the flange at aIl , because there is no blank - holder

Explanation :
No Explanation available for this question

# Which of the following materials requires the largest shrinkage allowance, while making a pattern for casting

1.  Aluminium

2.  Brass

3.  Cast Iron

4.  Plain Carbon Steel

4

Aluminium

Explanation :
No Explanation available for this question

# In Electro-Discharge Machining (EDM), the tool is made of:

1.  Copper

2.  High Speed Steel

3.  Cast Iron

4.  Plain Carbon Steel

4

Copper

Explanation :
No Explanation available for this question

# Choose the correct statement:

1.  A fixture is used to guide the tool a s well a s to locate  and clamp the work piece

2.  A jig is used to guide the tool a s well a s to locate and clamp the work piece

3.  Jigs are used on CNC machines to locate and clamp the work piece and a l so to guide the tool

4.  No arrangements to guide the tool is provided in a jig

4