This set of Thermal Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Centrifugal & Reciprocating Pumps”. 1. Which hydraulic machine convert mechanical energy into pressure energy? a) Pump b) Refrigerator c) Heat engine d) Turbine 2. Which of the following is a positive displacement pump? a) Centrifugal pump b) Diffuser pump c) Axial pump … Read more
This set of Thermal Engineering Questions and Answers for Aptitude test focuses on “Availability and Irreversibility”. 1. Availability function (∅) is given by ______ a) U-p0V-T0S b) U+p0V-T0S c) –U+p0V-T0S d) p0V-T0S 2. What is the lowest temperature at which heat rejection can takes place? a) 100°C b) 0K c) 273K d) Temperature equal to … Read more
This set of Thermal Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Psychrometers”. 1. Wet bulb depression, under saturated ambient air conditions _____________ a) Is always positive b) Is always negative c) Is always zero d) May have value depending upon the dew point temperature 2. What is the minimum temperature to which water … Read more
This set of Thermal Engineering Multiple Choice Questions & Answers (MCQs) focuses on “ Heat Transfer – Fins”. 1. A finned surface consists of root or base area of 1m2 and fin surface area of 2m2. The average heat transfer coefficient for finned surface is 20W/m2K effectiveness of fins provided is 0.75. If finned surface … Read more
This set of Thermal Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Heat Exchangers”. 1. A periodic type heat exchanger is known as _____ a) Direct contact heat exchanger b) Indirect contact heat exchanger c) Recuperator d) Regenerator 2. Surface heat exchangers are also known as _______ a) Direct contact heat exchanger b) Indirect … Read more
This set of Thermal Engineering Questions & Answers for Exams focuses on “Heat Transfer by Radiation”. 1. What is the equivalent emissivity for radiant heat exchange between a small body (emissivity = 0.4) in a very large enclosure (emissivity = 0.5)? a) 0.5 b) 0.4 c) 0.2 d) 0.1 2. If a body is at … Read more
This set of Thermal Engineering online test focuses on “Heat Transfer by Convection”. 1. Hot air at 50°C. If the forced heat transfer convection is 75 W/m2K, the heat gain rate gain rate by the plate through an area of 2m2 will be _____ a) 15KW b) 22.5KJ/sec c) 7.5KJ/sec d) 25KJ/sec 2. Nusselt number … Read more
This set of Thermal Engineering Objective Questions & Answers focuses on “Heat Transfer by Conduction”. 1. If the radius of any current carrying conductor is less than the critical radius, then why the addition of electrical insulation will enable the wire to carry a higher current? a) The heat loss from the wire would decrease … Read more
This set of Thermal Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Centrifugal Compressor”. 1. A centrifugal compressor delivers a certain quantity of air at a pressure of 1.65bar and 87°C. The intake conditions are 17°C and 1bar. Which of the following is the isentropic efficiency of the compressor? Consider n = 1.625. a) … Read more
This set of Thermal Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Rotary Compressor”. 1. A roots blower compressor compresses 0.08m3 of air from 1bar to 1.8bar per revolution. Which of the following is the actual work done per revolution? a) 6.25kJ b) 5.6kJ c) 5.4kJ d) 6.4kJ 2. A roots blower compressor compresses … Read more
