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SSC JE 2019-20: Technical Quiz 13

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Question 1

The flow through a circular pipe is laminar. Now, the fluid through the pipe is replaced with a more viscous fluid and passed through the pipe again with the same velocity. What can we say about the nature of this flow?

Question 2

A closed system receives 60 kJ heat but its internal energy decreases by 30 kJ. Then the work done (in KJ) by the system is _____.

Question 3

Match List-I (Alloying Element) with List-II (Effect on Steel) and select the correct answer using the codes give below the lists:
List-I
[A]. Vanadium
[B]. Molybdenum
[C]. Silicon
[D]. Chromium
List-II
[1]. Increases endurance strength
[2]. Improves creep properties
[3]. Increases hardness
[4]. Increases resistance to high temperature oxidation

Question 4

For a polished glass tube of  , what will be the approximate rise in capillary if the containing liquid is water at?

Question 5

A wall surface of 200 mm thickness has an outside temperature of 50 °C and inside temperature of 25 °C with thermal conductivity of 0.51 W/mK. The heat transfer through this wall will be

Question 6

Match List-I with List-II and select the correct answer using the code given below the lists:
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Question 7

A reversible heat engine is operating between the temperature limits of 606

And 20. The work done by the engine per 2kJ input of heat is

Question 8

For a strain gauge (gauge factor = 2.1 and resistance = 50), subjected to a maximum strain of 0.001, the maximum change in resistance is

Question 9

An ideal closed-cycle gas turbine plant is working between the temperatures 927 °C and 27 °C using air as working fluid. The pressure ratio for maximum output is

Question 10

Thickness of a steel plate is reduced from 20mm to 10mm by passing it through rolls of diameter 300mm in a multipass rolling operation. If the coefficient of friction is 0.1, then calculate the minimum number of passes required.
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