GATE XE purpose:exam-prep PYQs & Answers — Page 10

Questions 91–100 of 1772. Imported answers require independent review unless marked reviewed.

Which ONE of the following statements is CORRECT?

Your answerChoose one option.

For an ideal gas, specific enthalpy (

) is a function of both temperature and pressure.

Internal energy (

), entropy (

), and enthalpy (

) are path functions.

Heat transferred (

) and work done (

) are state (point) functions.

Temperature (

), pressure (

), and specific volume (

) are intensive properties.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A mixture of carbon-dioxide (CO₂), nitrogen (N₂) and oxygen (O₂) are introduced in a rigid and impermeable tank containing only liquid water (H₂O). Assume that the components are non-reacting and un-dissociated. The system is kept isolated till an equilibrium is achieved, where only two phases are present. The degrees-of-freedom of the equilibrium mixture, as obtained from the phase rule, is

Your answerChoose one option.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A stream of moist air at 101 kPa and 25 °C undergoes a constant pressure process such that its dry bulb temperature increases and specific humidity decreases. For this process, which of the following statements is/are always CORRECT?

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

Wet bulb temperature increases.

Dew point temperature decreases.

Relative humidity decreases.

Adiabatic saturation temperature increases.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Which of the following is/are example(s) of a pure substance at 25 °C and 101 kPa?

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

Gaseous oxygen

Mixture of liquid water and water vapor

Mixture of liquid water and gaseous oxygen

Homogenous mixture of gaseous oxygen and water vapor

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A house looses heat at a rate of 150 MJ per hour. The temperature outside the house is −3 °C. The minimum power (in kW) required to maintain the temperature inside the house at 25 °C using a heat pump is ____________ (rounded off to two decimal places).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Consider an ideal Otto-cycle with cold-air-standard assumptions to be applicable. The temperature of the working fluid at the start and the end of the compression process is 300 K and 750 K, respectively. For the working fluid take the ratio of the specific heat capacities as 1.4. The thermal efficiency (in %) of the cycle is __________________ (rounded off to two decimal places).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Consider a real gas, which obeys the following equation-of-state:

where

is the mass specific volume,

is the pressure,

is the temperature and

is the gas constant.

and

are constants. If

is the mass specific entropy, the quantity

for the gas is given by

Your answerChoose one option.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

M kg of a liquid at a temperature

is mixed with M kg of the same liquid at another temperature

in an isolated tank at constant pressure. The mass specific heat capacity at constant pressure of the liquid is

, which is a constant. The total entropy change in the process is

Your answerChoose one option.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A fluid undergoes a process where its pressure (P), temperature (T) and volume (V) changes from

. During the process, volume expansivity (

) and isothermal compressibility (

) remain constant. Given that

and

, the ratio

Your answerChoose one option.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Consider an ideal Rankine cycle with fixed conditions at the turbine inlet. If the condenser pressure is lowered, which of the following statements is/are CORRECT?

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

Pump work input remains the same.

Moisture content at turbine exit decreases.

Heat rejected in the condenser decreases.

Turbine work output increases.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

GATE XE purpose:exam-prep PYQs

Question 91

Question 92

Question 93

Question 94

Question 95

Question 96

Question 97

Question 98

Question 99

Question 100