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Mechanical Engineering Exam  >  Mechanical Engineering Tests  >  Mock Test: SSC JE (ME)- 6 - Mechanical Engineering MCQ

Mock Test: SSC JE (ME)- 6 - Mechanical Engineering MCQ


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30 Questions MCQ Test - Mock Test: SSC JE (ME)- 6

Mock Test: SSC JE (ME)- 6 for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Mock Test: SSC JE (ME)- 6 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Mock Test: SSC JE (ME)- 6 MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Mock Test: SSC JE (ME)- 6 below.
Solutions of Mock Test: SSC JE (ME)- 6 questions in English are available as part of our course for Mechanical Engineering & Mock Test: SSC JE (ME)- 6 solutions in Hindi for Mechanical Engineering course. Download more important topics, notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free. Attempt Mock Test: SSC JE (ME)- 6 | 100 questions in 60 minutes | Mock test for Mechanical Engineering preparation | Free important questions MCQ to study for Mechanical Engineering Exam | Download free PDF with solutions
Mock Test: SSC JE (ME)- 6 - Question 1
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Match the following List - I with List -II:

Mock Test: SSC JE (ME)- 6 - Question 2
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Which one of the following is not the correct statement about control volume?

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Mock Test: SSC JE (ME)- 6 - Question 3
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Match List - I with List -II the following:

Mock Test: SSC JE (ME)- 6 - Question 4
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Heat transferred to a closed stationary system at constant volume is equal to
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The first law of thermodynamics is dQ= du+dw. (Where symbols have usual meaning) For a chemical system dw= pdv, but when the volume is constant, dv=0 and, dQ=du. So, under the condition of constant volume heat transferred is equal to the change in the internal Energy of the system.

Mock Test: SSC JE (ME)- 6 - Question 5
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It is desired to bring about a certain change in the state of a system by performing work on thesystem under adiabatic conditions.
Mock Test: SSC JE (ME)- 6 - Question 6
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Key concept in analyzing the filling of an evacuated tank is
Mock Test: SSC JE (ME)- 6 - Question 7
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In the vander waal’s equation, the unit of constant a is
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Mock Test: SSC JE (ME)- 6 - Question 8
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An Open system is one in which
Mock Test: SSC JE (ME)- 6 - Question 9
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The specific heat of water is
Mock Test: SSC JE (ME)- 6 - Question 10
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Which of the following statement is correct ?
Mock Test: SSC JE (ME)- 6 - Question 11
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The....... states that changes of internal energy of a perfect gas is directly proportional to the change of temperature.
Mock Test: SSC JE (ME)- 6 - Question 12
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When gas is heated at constant pressure, the heat supplied is utilised in
Mock Test: SSC JE (ME)- 6 - Question 13
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Thermoelectric refrigeration system is based on
Mock Test: SSC JE (ME)- 6 - Question 14
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A reversible heat engine runs between high temperature T1 and low temperature T2. The work output of this heat engine is used to run a reversible refrigeration cycle absorbing heat at temperature T2. What is the COP of the combined system ?
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Mock Test: SSC JE (ME)- 6 - Question 15
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Superheating in refrigeration cycle
Detailed Solution for Mock Test: SSC JE (ME)- 6 - Question 15

The refrigerators are the heat pumps which are used to lower the temperature of a given volume by doing work on fluid. The refrigerators work on a reverse Carnot cycle. The cool liquid passing through a chamber which is warmer does work on this fluid to convert it into the gaseous form thus lowering the temperature in the chamber. This process continues so as to bring the temperature of the chamber to a required temperature.

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The quality or efficiency of performance of a refrigerator is determined by the coefficient of performance (COP) which is the ratio of the heat supplied or the work done by the air in the chamber to the work required by the system.

COP=Q/W

The work done W is the external work provided to the system for this non-spontaneous process to happen, in our case the electrical energy.
The superheating is the process in which the excess amount of heat is provided to the coolant. This increases the rate of cooling, which is a good indicator for COP.
But also, we should understand that if superheating occurs in a refrigerator, the external energy should be greater to keep the cycle moving.
From the above observations, the coolant evaporates faster adding efficiency of the system, on the other hand, the W required by the system increases, which clearly denotes a decline in the efficiency or the coefficient of performance of the refrigerator.
We get to know that the COP either increases or decreases when superheating takes place in a refrigerator, it is not consistent and therefore unpredictable.

Mock Test: SSC JE (ME)- 6 - Question 16
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A one tonner refrigerating machine means that
Mock Test: SSC JE (ME)- 6 - Question 17
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Hydrogen is used in electrolux refrigeration system so as to ....... the rate of evaporation ofthe liquid ammonia passing through the evaporator.
Mock Test: SSC JE (ME)- 6 - Question 18
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Engine of different cylinder dimensions, power and speed are compared on the basis of
Mock Test: SSC JE (ME)- 6 - Question 19
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Match the List-I (IC engine parts) with List-II (Materials) following :
Mock Test: SSC JE (ME)- 6 - Question 20
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When the engines are built to withstand the same thermal and mechanical stresses
Mock Test: SSC JE (ME)- 6 - Question 21
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The float in the carburetor of a petrol engine controls
Mock Test: SSC JE (ME)- 6 - Question 22
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In an I.C. engine, the process of removing the burnt gases from the combustion chamber of the engine cylinder is known as
Mock Test: SSC JE (ME)- 6 - Question 23
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The exhaust valve in a four stroke cycle petrol engine
Mock Test: SSC JE (ME)- 6 - Question 24
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Diesel as compared to petrol is
Mock Test: SSC JE (ME)- 6 - Question 25
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The crown of the fire box is made hemispherical in order to
Mock Test: SSC JE (ME)- 6 - Question 26
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Which of the following is not the desirable property of a good fuel?
Mock Test: SSC JE (ME)- 6 - Question 27
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Calorific value of gaseous fuels can be found be
Mock Test: SSC JE (ME)- 6 - Question 28
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Reheating of steam under ideal condition takes place at constant
Detailed Solution for Mock Test: SSC JE (ME)- 6 - Question 28


Reheating of steam under ideal condition takes place at constant temperature.In reheating type boiler-turbine plant the heat/energy transferred into the steam per kilo is higher and enthalpy loss in condenser is relatively lower (it is always constant kJ/kg).

Mock Test: SSC JE (ME)- 6 - Question 29
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Atomic number of an element in the periodic table represents the numbers of
Mock Test: SSC JE (ME)- 6 - Question 30
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Boiler water reactor employs
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