GATE ME Applications PYQs & Answers

Questions 1–10 of 61. Imported answers require independent review unless marked reviewed.

For an ideal regenerative Rankine cycle, as shown in the figure below, which one of the following options is the correct representation of temperature-entropy (T-s) diagram?

Diagram for Mechanical Engineering question 44

Your answerChoose one option.

Diagram for Mechanical Engineering question 44 (figure 2)

Diagram for Mechanical Engineering question 44 (figure 3)

Diagram for Mechanical Engineering question 44 (figure 4)

Diagram for Mechanical Engineering question 44 (figure 5)

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An inward flow reaction turbine, having an outer diameter of 1 m, runs at 600 RPM. The normal component of absolute velocity at the inlet is 10 m/s. If the guide blade angle is 15°, then the inlet vane angle of the runner is ______ degree (rounded off to 1 decimal place).

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In a psychometric chart, one axis represents dry-bulb temperature. The axis, that is perpendicular to the dry-bulb temperature axis, represents

Your answerChoose one option.

wet-bulb temperature

specific humidity

relative humidity

enthalpy

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The thermal efficiency of an ideal air-standard Otto cycle is 0.5. The value of specific heat ratio of air is 1.4. The compression ratio of the cycle is ____________ (rounded off to 1 decimal place).

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A thermal power plant is running with no heat regeneration. The specific enthalpy and specific entropy of steam at the turbine inlet are 3344 kJ kg

and 6.5 kJ kg

, respectively. The turbine isentropic efficiency is 0.9, and the mass flow rate of steam at the turbine inlet is 102 kg s

. The turbine power output is __________ MW (rounded off to 1 decimal place).

Properties of saturated liquid and saturated vapor at turbine exit pressure

Saturated liquid water: Specific enthalpy (kJ kg )	Saturated liquid water: Specific entropy (kJ kg K )	Saturated water vapor: Specific enthalpy (kJ kg )	Saturated water vapor: Specific entropy (kJ kg K )
341	1.1	2645	7.6

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Consider a Pelton wheel of 1 m diameter. The magnitude of relative velocity of water at the bucket inlet is same as the magnitude of relative velocity of water at the bucket exit. The absolute speed of water at the bucket inlet is 125.66 m s

. For maximum power output from the Pelton wheel, the rpm of the Pelton wheel is ________________ (rounded off to 1 decimal place).

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A heat pump, operating in reversed Carnot cycle, maintains a steady air temperature of 300 K inside an auditorium. The heat pump receives heat from the ambient air. The ambient air temperature is 280 K. Heat loss from the auditorium is 15 kW. The power consumption of the heat pump is ________ kW (rounded off to 2 decimal places).

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Which one of the following statements regarding a Rankine cycle is FALSE?

Your answerChoose one option.

Superheating the steam in the boiler increases the cycle efficiency.

The pressure at the turbine outlet depends on the condenser temperature.

Cycle efficiency increases as condenser pressure decreases.

Cycle efficiency increases as boiler pressure decreases.

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Steady, compressible flow of air takes place through an adiabatic converging-diverging nozzle, as shown in the figure. For a particular value of pressure difference across the nozzle, a stationary normal shock wave forms in the diverging section of the nozzle. If

and

denote the flow conditions just upstream and downstream of the normal shock, respectively, which of the following statement(s) is/are TRUE?

Diagram for Mechanical Engineering question 40

Your answerSelect all correct options. You can choose more than one.

Static pressure at

is lower than the static pressure at $F

Density at

is lower than the density at $F

Mach number at

is lower than the Mach number at $F

Specific entropy at

is lower than the specific entropy at $F

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Consider an air-standard Brayton cycle with adiabatic compressor and turbine, and a regenerator, as shown in the figure. Air enters the compressor at 100 kPa and 300 K and exits the compressor at 600 kPa and 550 K. The air exits the combustion chamber at 1250 K and exits the adiabatic turbine at 100 kPa and 800 K. The exhaust air from the turbine is used to preheat the air in the regenerator. The exhaust air exits the regenerator (state 6) at 600 K. There is no pressure drop across the regenerator and the combustion chamber. Also, there is no heat loss from the regenerator to the surroundings. The ratio of specific heats at constant pressure and volume is

. The thermal efficiency of the cycle is ________ % (answer in integer).

Diagram for Mechanical Engineering question 45

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GATE ME Applications PYQs

How to practice Applications

Question 44

Question 58

Question 19

Question 32

Question 52

Question 53

Question 55

Question 21

Question 40

Question 45