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Mechanical Engineering Exam  >  Mechanical Engineering Tests  >  Past Year Questions: Heat Pumps And Cycles - Mechanical Engineering MCQ

Past Year Questions: Heat Pumps And Cycles - Mechanical Engineering MCQ


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6 Questions MCQ Test - Past Year Questions: Heat Pumps And Cycles

Past Year Questions: Heat Pumps And Cycles for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Past Year Questions: Heat Pumps And Cycles questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Past Year Questions: Heat Pumps And Cycles MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Past Year Questions: Heat Pumps And Cycles below.
Solutions of Past Year Questions: Heat Pumps And Cycles questions in English are available as part of our course for Mechanical Engineering & Past Year Questions: Heat Pumps And Cycles 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 Past Year Questions: Heat Pumps And Cycles | 6 questions in 5 minutes | Mock test for Mechanical Engineering preparation | Free important questions MCQ to study for Mechanical Engineering Exam | Download free PDF with solutions
Past Year Questions: Heat Pumps And Cycles - Question 1
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Clearance volume of a reciprocating compressor is 100 ml, and the volume of the cylinder at bottom dead centre is 1.0 litre. The clearance ratio of the compressor is

[1997]

Detailed Solution for Past Year Questions: Heat Pumps And Cycles - Question 1

Clearance ratio = 

Past Year Questions: Heat Pumps And Cycles - Question 2
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An industrial heat pump operates between the temperatures of 27°C and -13°C. The rates of heat addition and heat rejection are 750 W and 1000 W, respectively. The COP for the heat pump is

[2003]

Detailed Solution for Past Year Questions: Heat Pumps And Cycles - Question 2

Heat addition, Q2 = 750 W
Heat rejected, Q1 = 1000 W


T1 = 273 + 27º = 300ºK

 for actual heat pump

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Past Year Questions: Heat Pumps And Cycles - Question 3
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A vapour absorption refrigeration system is a heat pump with three thermal reservoirs as shown in the figure. A refrigeration effect of 100 W is required at 250 K when the heat source available is at 400 K. Heat rejection occurs at 300 K. The minimum value of heat required (in W) is

[2005]

Detailed Solution for Past Year Questions: Heat Pumps And Cycles - Question 3

From question, since refrigeration effect of 100 W is required
So, 

Now for this amount of work, heat is absorbed fromreservoir 3 and rejected to sink 2.

⇒ Q3 =4W = 4 x 20 W = 80 W

Past Year Questions: Heat Pumps And Cycles - Question 4
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The thermodynamic cycle shown in figure (T-s diagram) indicates

[2015]
Detailed Solution for Past Year Questions: Heat Pumps And Cycles - Question 4

T-S diagram represent a reversed brayton cycle used in air conditioning of aeroplanes where air is used as a refrigerant.

Past Year Questions: Heat Pumps And Cycles - Question 5
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A heat engine having an efficiency of 70% is used to drive a refrigerator having a coefficient of performance of 5. The energy absorbed from low temperature reservoir by the refrigerator for each kJ of energy absorbed from high temperature source by the engine is

[2004]
Detailed Solution for Past Year Questions: Heat Pumps And Cycles - Question 5

Given: ηengine = 0.7, (C.O.P)R = 5
 ...(i)

Now,

 ...(ii)
Again, 

Energy absorbed from low temperature reservoir by the refrigerator for each kJ of energy absorbed from high temperature source by the engine = 3.5 kJ.

Past Year Questions: Heat Pumps And Cycles - Question 6
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A thin layer of water in a field is formed after a farmer has watered it. The ambient air conditions are: temp. 20°C and relative humidity 5%. An extract of steam tables is given below.

Neglecting the heat transfer between the water and the ground, the water temperature in the field after phase equilibrium is reached equals

[2006]
Detailed Solution for Past Year Questions: Heat Pumps And Cycles - Question 6

Given data:
φ = 5% = 0.05
Tdb = 20°C
From table
At 20°C, Ps = 2.34 kPa

PV =.117 k Pa
By Interpolation method,

= – 15 + 0.531 = – 14.5° C

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