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GATE 2019: Thermodynamics Rapid Quiz-3 (App update required to attempt this test)

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Question 1

A vehicle powered by a spark ignition engine follows air standard Otto cycle

The engine generates 70 kW while consuming 10.3 kg/hr of fuel. The calorific value of fuel is 44,000 kJ/kg. The compression ratio is __________ (correct to two decimal places).

Question 2

8 Kg of water in a constant pressure container is agitated by a paddle unit, the temperature rises from 50^oC to 90^oC. The change in entropy ( in KJ/K) of water is

Question 3

SI engines are governed by

Question 4

The specific power output of a gas turbine is 336.5 kW/Kg and the exhaust gases leave the turbine at 700 K. If the value of C_P and C_V are 1 kJ/kg-K and 0.717 kJ/kg-K respectively, the turbine pressure ratio is

Question 5

A heat engine operates between three thermal reservoirs. It absorbs 258 kJ of energy as heat from a reservoir at 52⁰C and rejects 100 kJ and 88 kJ of energy as heat to reservoirs at 27⁰C and 2⁰C repectively.It delivers 70 kJ of work.This heat engine _______.

Question 6

Consider two identical blocks of copper, each having a mass of 200 kg and specific heat of 0.3831 kJ/kg-k.One block is available at 600 K and other at 1200 K.Two blocks are brought into thermal contact with each other and allowed to reach a state of thermal equilibrium.Loss of available energy if the ambient temperature is 27⁰C___________________kJ.

Question 7

One kg of air is available at 500 kPa and 300 K.The air is allowed to expand to a pressure of 100 kPa while in contact with the surroundings at 300 k. The final temperature of air is 300 K.Maximum amount of work that can be obtained is ________________kJ.

Question 8

For an engine operating on air standard Otto cycle, the clearance volume is 10% of the swept volume. The specific heat ratio of air is 1.4. the air standard cycle efficiency is

Question 9

In a heat engine, the ideal gas carries maximum temperature at point ................

Question 10

A Carnot steam cycle operates between a source at temperature of 311.6 °C, pressure 10 MPa and sink temperature of 32.88 °C and pressure 5 kPa. Related table is given below

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Work ratio of the carnot cycle will be

Question 11

Air enters an adiabatic nozzle at 20 bar and 50 °C with a velocity of 80 m/s and leaves with a velocity of 300 m/s. If the area ratio of the nozzle is 4 : 1. The exit pressure (in bar) of the air is
[Take C_p = 1.0 kJ/kgK for air]

Question 12

The internal energy of a certain system is a function of temperature alone and is given by formula E = 25 + 0.25 t kJ (where t is the temperature). If this system executes a process for which the work done by it per degree temperature increase is 0.75 kN-m, the heat-interaction per degree temperature increase is _________ kJ.

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ESE & GATE ME Thermodynamics

Apr 26ESE & GATE ME