SSC JE Mechanical Engineering 2nd March 2017 Shift-1

Instructions

For the following questions answer them individually

Question 1

A football was inflated to a gauge pressure of 1 bar when the ambient temperature was $$15^\circĀ  C$$. When the game started next day, the air temperature at the stadium was $$5^\circ C$$. Assume that the volume of the football remains constant at 2500 $$cm^{3}$$. Gauge pressure of air to which the ball must have been originally inflated so that it would equal 1 bar gauge at the stadium is _____

Question 2

The engine oil at $$150^\circ$$ C is cooled to $$80^\circ$$C in a parallel flow heat exchanger by water entering at $$25^\circ$$C and leaving at $$60^\circ$$ C. The exchanger effectiveness will be

Question 3

The atomic packing factor is the highest in which of the following cubic lattice system?

Question 4

The valves mounted on the boilers which change the direction of flow of steam by $$90^\circ$$ and valves fitted in the pipelines which allow the steam in the same direction are respectively called as _____

Question 5

Which of the following are boiler mountings and not boiler accessories ?
A: Pressure gauge
B: Air preheater
C: Superheater


Question 6

Entropy is a measure of

Question 7

Gibbs free energy is considered at which one of the following condition?

Question 8

In vapour absorption refrigeration systems, which of the following fluids are commonly used?

Question 9

In a cross compound steam engine ......

Question 10

Which of the following is expected to have highest thermal conductivity?

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