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SSC JE 2019-20: Technical Quiz 5

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Question 1

Match List-I (Element) with List-II (Crystal Structure) and select the correct answer using the codes given below the lists:
List-I
[A]. Alpha Iron
[B]. Copper
[C]. Zinc
[D]. Glass
List-II
[1]. Hexagonal closed packed
[2]. Body-centred cubic
[3]. Amorphous
[4]. Face-centred cubic

Question 2

Match List-I with List-II and select the correct answer using the code given below the Lists:
List-I
A) Stanton number
B) Grashoff number
C) Peclet number
D) Schmidt number
List-II
1) Natural convection
2) Mass transfer
3) Forced convection
4) Forced convection for small Pr. Number

Question 3

What is the condition for dynamic balancing of a shaft-rotor system?

Question 4

A bar of 2m length is fixed at both ends. If E = 2 × 10⁶ kg /cm², coefficient of expansion is 1.5 × 10^–6 /°C and the temperature rise is 20°C, the stress developed in the material is

Question 5

An air-conditioned room of volume 10m³ has infiltration of air equivalent to 3 air changes per hour. Density of air is 1.2 kg/m3, specific heat C_P is 1 kJ/kgK and temperature difference between room and ambient air is 20 K. What is the sensible heat load due to infiltrated air?

Question 6

There is no work transfer involved in this process

Question 7

Which of the following factors improve weldability of steel?
1. Low carbon content
2. High carbon content
3. Good affinity to oxygen
4. Poor affinity to oxygen

Question 8

The thermal efficiency of a Carnot heat engine is 30%. If the engine is reversed in operation to work as a heat pump with operating conditions unchanged, then what will be the COP for heat pump?

Question 9

In a Brayton cycle, what is the value of optimum pressure ratio for maximum net work done between temperatures $Description: Description: Practice-Set-7_files\image017.png$ and $Description: Description: Practice-Set-7_files\image018.png$ where $Description: Description: Practice-Set-7_files\image019.png$ is the maximum temperature and $Description: Description: Practice-Set-7_files\image017.png$ is the minimum temperature?

Question 10

In a flat belt drive the belt can be subjected to a maximum tension T and centrifugal tension

. What is the condition for transmission of maximum power?

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