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ESE 2022 ME - Technical Quiz 7

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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 90o  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 26oC 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

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

Question 10

A 30 mm diameter disc is to be punched out from a steel sheet 2 mm thick. The diameter (in mm ) of the punch is _____ (Shear strength of material is 225 MPa)
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