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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
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
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 CP 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
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 and where is the maximum temperature and 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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ESE & GATE MEGeneralDec 9ESE & GATE ME