ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2018

For a glass plate, transitivity and reflectivity are specified as 0.86 and 0.08 respectively, the absorptivity of the glass plate is

A composite slab has two layers of different materials with thermal conductivities $$k_{1}$$ and $$k_{2}$$. If each layer has same thickness, then the equivalent thermal conductivity will be:

The ratio of heat flow $$\frac{Q_{1}}{Q_{2}}$$ from two walls of same thickness having their thermal conductivities as $$K_{1} = 2K_{2}$$ will be:

In case of saddle key, power is transmitted by means of

The angle of twist for a transmission shaft is inversely proportional to

Two mating spur gears have 40 and 120 teeth respectively. The pinion transmits at 1200 rpm and transmits a torque of 20 N-m. The torque transmitted by gear is:

The expected life of a ball bearing subjected to a load of 9800 N and operating at 1000 RPM is 3000 hrs. What is the expected life of the same bearing for similar load of 4900 N and speed of 2000 RPM

Neutral axis of a beam is;

A Gas engine has a swept volume of $$300 cm^{3}$$ and its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. The volume of mixture taken in per stroke is

The ratio of the brake power to indicated power is called