ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2015

Study showed the percentage of occurrence of an activity as 50%. The number of observations for 95% confidence level and an accuracy of $$\pm$$2% is

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

Suppose that a particle moves on a coordinate line so that its velocity at time t is $$v(t) = t^2 - 2t$$ m/s. The displacementofthe particle during time interval $$0 \leq t \leq 3$$ is

Approach of cooling tower means

Which of the following is not the intensive property?

A carnot cycle consists of

Two loads P act at right angles to one another at the free end of a cantilever beam having square cross-section $$d \times d$$ and length l on the vertical and horizontal faces. Maximum bending stress in the beam will be equal to

The head loss due to sudden expansion assuming incompressible flow is expressed by

PERT has the following time estimate

‘Two plane slabs of equal areas and conductivities in the ratio 1 : 2 are held together and temperature in between surface ends are $$t_1$$ and $$t_2$$. If junction temperature in between two surfaces is desired to be $$\frac{t_1 + t_2}{2}$$, then their thicknesses should be in the ratio of