Mechanical Engineering - Online Test

Q1. In a condenser of a power plant, the steam condenses at a temperature of 60o C . The cooling water enters at 30o C and leaves at 45o C . The logarithmic mean temperature difference (LMTD) of the condenser is 
Answer : Option B
Explaination / Solution:

Flow configuration in condenser as shown below. 


Q2. Green sand mould indicates that
Answer : Option D
Explaination / Solution:
No Explaination.


Q3. The word kanban is most appropriately associated with
Answer : Option B
Explaination / Solution:
No Explaination.


Q4. Square roots of − i, where i = √-1, are
Answer : Option B
Explaination / Solution:
No Explaination.


Q5. A manufacturer can produce 12000 bearings per day. The manufacturer received an order of 8000 bearings per day from a customer. The cost of holding a bearing in stock is Rs.0.20 per month. Setup cost per production run is Rs.500. Assuming 300 working days in a year, the frequency of production run should be
Answer : Option C
Explaination / Solution:
No Explaination.


Q6. Heat and work are
Answer : Option D
Explaination / Solution:

Heat and work are path functions. Since δQ and δW are dependent on path followed between two given end states of a thermodynamic process undergone by system.

Q7. The coefficient of restitution of a perfectly plastic impact is
Answer : Option A
Explaination / Solution:

Coefficient of Re stitution = Relative velocity of separation/Relative velocity of approach
                                         = O for perfectly plastic impact
 since both bodies clinge together after impact.

Q8. A function y = 5x2 + 10x is defined over an open interval x = (1,2). Atleast at one point in this interval, dy/dx is exactly
Answer : Option B
Explaination / Solution:
No Explaination.


Q9. A streamline and an equipotential line in a flow field
Answer : Option B
Explaination / Solution:


Slope of equipotential Line × slope of stream function= -1 
They are orthogonal to each line other. 

Q10. A pipe of 25mm outer diameter carries steam. The heat transfer coefficient between the cylinder and surroundings is 5W /m2K . It is proposed to reduce the heat loss from the pipe by adding insulation having a thermal conductivity of 0.05W/mK. Which one of the following statements is TRUE? 
Answer : Option C
Explaination / Solution:
No Explaination.