Thermodynamics - 1 - Mechanical Engineering


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15 Questions MCQ Test GATE Mechanical (ME) 2023 Mock Test Series - Thermodynamics - 1

Thermodynamics - 1 for Mechanical Engineering 2023 is part of GATE Mechanical (ME) 2023 Mock Test Series preparation. The Thermodynamics - 1 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Thermodynamics - 1 MCQs are made for Mechanical Engineering 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Thermodynamics - 1 below.
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Thermodynamics - 1 - Question 1

Consider the following properties:

  1. Temperature
  2. Viscosity
  3. Specific entropy
  4. Thermal conductivity

Which of the above properties of a system is/are intensive?

Detailed Solution for Thermodynamics - 1 - Question 1

(d) Intensive properties are independent of the mass in the system, for example, density, pressure, temperature. Extensive properties are related to mass, for example, volume, energy.

Thermodynamics - 1 - Question 2

Pressure reaches a value of absolute zero

Detailed Solution for Thermodynamics - 1 - Question 2

(d) Temperature and pressure are the measures of molecular moment of the system. The molecular moment of the system is zero, the absolute temperature and absolute pressure becomes zero.

Thermodynamics - 1 - Question 3

Ice kept in a well insulated thermos flask is an example of which system?

Detailed Solution for Thermodynamics - 1 - Question 3

(b) Heat and work cannot be transferred into the ice kept in a well insulated thermos flask, hence, it is an isolated system.

Thermodynamics - 1 - Question 4

A thermodynamic system is considered to be an isolated one if

Detailed Solution for Thermodynamics - 1 - Question 4

(c) An isolated system has no interaction with its surroundings.

Thermodynamics - 1 - Question 5

The phenomenon of magnetic arc blow is observed almost exclusively with

Thermodynamics - 1 - Question 6

Work transfer between the system and surround­ings

Detailed Solution for Thermodynamics - 1 - Question 6

(d) The change in a property of a system is independent of the path the system follows during the change of state. Therefore, properties are point functions. Work transfer is not a property of the system.

Thermodynamics - 1 - Question 7

A hot metal piece kept in air cools from 80°C to 70°C in t1 seconds, from 70°C to 60°C in t2 seconds and from 60°C to 50°C in t3 seconds, then

Thermodynamics - 1 - Question 8

A cyclic heat engine does 50 kJ of work per cycle. If the efficiency of the heat engine is 75%, the heat rejected per cycle is

Detailed Solution for Thermodynamics - 1 - Question 8

Given that

W = 50 KJ

η = 0.75

Heat rejected per cycle is determned as

 

Thermodynamics - 1 - Question 9

It is proposed to build a refrigeration plant for cold storage to be maintained at — 3°C. The ambient temperature is 27° C. If 5 x 106 kJ/h of energy is tobe continuously removed from the cold storage, the minimum power required to run the refrigerator will be

Detailed Solution for Thermodynamics - 1 - Question 9

Given that

T2 = 270 K

T1 = 27 + 273 

=  300 K

Thermodynamics - 1 - Question 10

A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigeration machine with all other conditions unchanged, the coefficient of performance will be

Detailed Solution for Thermodynamics - 1 - Question 10

Given that ηe = 0.3 . The COP of the refrigerater is

Thermodynamics - 1 - Question 11

A heat engine is supplied with 250 kJ/s of heat at a constant fixed temperature of 227° C. The heat is rejected at 27° C. The cycle is reversible, if the amount of heat rejected is

Detailed Solution for Thermodynamics - 1 - Question 11

The  minimum heat rejected by reversible cycle is given by

Thermodynamics - 1 - Question 12

Which one of the following pairs best expresses a relationship similar to that expressed in the pair “pressure-volume” for a thermodynamic system undergoing a process?

Thermodynamics - 1 - Question 13

A heat pump working on a reversed Carnot cycle has a COP of 5. If it works as a refrigerator taking 1 kW of work input, the refrigeration effect will be

Detailed Solution for Thermodynamics - 1 - Question 13

COP of the heat Pump is

 

The COP of the refrigerater is 

Thermodynamics - 1 - Question 14

One reversible heat engine operates between 1600 K and T2 K, and smother reversible engine operates between T2 K and 400 K. If both engines have the same heat input and output, then the temperature T2 must be equal to

Detailed Solution for Thermodynamics - 1 - Question 14

The given condition means equal efficiency of both engines , therefore

Thermodynamics - 1 - Question 15

A heat engine using lake water at 12° C as source and the surrounding atmosphere at 2°C as sink executes 1080 cycles per minute. If the amount of heat drawn per cycle is 57 J, then the output of the engine will be

Detailed Solution for Thermodynamics - 1 - Question 15

Given That

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