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ESE ME 2021 : Technical Quiz-13

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Question 1

Which of the following sensor uses piezoelectric polyvinylidene fluoride (PVDF) for its manufacturing __________.

Question 2

Scab is a defect of ____.

Question 3

In a radial cam with reciprocating roller follower, the smallest drawn circle from the centre will be:

Question 4

The acceleration of the piston at the position when the crank makes an angle of 90^o with the line of slider is equal to

(Consider the length of connecting rod as 250 mm and crank radius as 50 mm)

where R is crank radius and is angular velocity of crank

Question 5

The ratio of the diameter of rivet hole to the pitch of rivet is 0.25, then the tearing efficiency of the joint is

Question 6

A liquid flows through two similar pipes 1 and 2. If the ratio of their flow velocities v₁ : v₂ be 2:3. what will be the ratio of the head loss in the two pipes?

Question 7

Heat is generated steadily in a 3 cm diameter spherical ball. The ball is exposed to ambient air at 26^oC with a heat transfer coefficient of 7.5 W/m²-^oC. The ball is to be covered with a material of thermal conductivity 0.15 W/m-^oC. If the ball surface temperature remains as constant, the thickness of the covering material that will maximize heat generation within the ball, is _________.

Question 8

Which of the following is incorrect with respect to increase in condenser pressure?

Question 9

Air enters the centrifugal compressor at 310 K. The slip factor(ф_s) and work factors(ф_w) are 0.92 and 1.04 respectively. If Impeller external diameter is 0.75 m and running at 12000 rpm, then find the temperature of air at outlet.

Question 10

An economizer in a steam generator performs the function of preheating the

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