# Fluid Mechanics & Thermal Sciences [GATE (Graduate Aptitude Test in Engineering) Mechanical Engineering]: Questions 71 - 73 of 77

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## Question 71

Fluid Mechanics & Thermal Sciences
Carnot Cycle

Appeared in Year: 2020

### Question

If a reversed Carnot cycle operates between the temperature limits of and – 3°C, then the ratio of the COP of a refrigerator to that of a heat pump (COP of refrigerator/COP of heat pump) based on the cycle is ________ (round off to 2 decimal places) .

## Question 72

Fluid Mechanics & Thermal Sciences
Properties of Pure Substances

Appeared in Year: 2021

### Question

A rigid tank of volume contains a pure substance as a saturated liquid vapour mixture at 400 kPa. Of the total mass of the mixture, 20 % mass is liquid, and 80 % mass is vapour. Properties at 400 kPa are: Saturation temperature, ; Specific volume of saturated liquid. /kg; Specific volume of saturated vapour, /kg. The total mass of liquid vapour mixture in the tank is ________ kg (round off to the nearest integer) . (February Shift 2)

## Question 73

Fluid Mechanics & Thermal Sciences
Differential Equations of Continuity and Momentum

Appeared in Year: 2021