  # ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2013

Instructions

For the following questions answer them individually

Question 11

# A perfect gas at $$27^\circ C$$ is heated at constant pressure till its volume is double. The final temperature is: Question 12

# $$1 m^3$$ of air at a pressure of $$10 kg/cm^2$$ is allowed to expand freely to a volume of $$10 m^3$$. The work done will be: Question 13

# One reversible heat engine operates between 1400 K and $$T_2K$$ and another reversible heat engine operates between T2K and 600 K. If both the engines have the same heat input and output, then temperature $$T_2$$ is equal to: Question 14

# Carnot cycle consists of: Question 15

# The operating temperature of a cold storage is $$-4^\circ C$$. The heat leakage from the surrounding is 30 kW for the ambient temperature of $$35^\circ C$$. The actual C.O.P. of refrigeration plant used is one-fifth that of ideal plant working between the same temperatures. The power required to drive the plant is: Question 16

# The essential constituent of a hardened steel is: Question 17

# In a vibrating system, if the actual damping coefficient is 50 N/m/s and critical damping coefficient is 500 N/m/s, then logarithmic decrement is equal to: Question 18

# A block of mass 1.2 kg moving at a speed of 20 cm/s collides head on with a similar block | keptat rest, the coefficient of restitution is 3/5, the loss of kinetic energy during the collision is: Question 19

# Stage efficiency of a turbine is equal to: Question 20

# A pendulum bob has a speed of 3 m/s while passing throughits lowest position, the speed of the bob when it makes an angle of $$60^\circ$$ with the vertical is: (Assume g = 10 m/sec$$^2$$ and Length of pendulum is 0.5 m): OR