# Fluid Mechanics & Thermal Sciences [GATE (Graduate Aptitude Test in Engineering) Mechanical Engineering]: Questions 53 - 55 of 77

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## Question 53

Appeared in Year: *2020*

### Question

MCQ▾For an air-standard Diesel cycle

### Choices

Choice (4) | Response | |
---|---|---|

a. | heat addition is at constant volume and heat rejection is at constant volume | |

b. | heat addition is at constant pressure and heat rejection is at constant pressure | |

c. | heat addition is at constant pressure and heat rejection is at constant volume | |

d. | heat addition is at constant volume and heat rejection is at constant pressure |

## Question 54

Appeared in Year: *2020*

### Question

Numeric Answer▾Water flows through a tube of 3 cm internal diameter and length 20 m. The outside surface of the tube is heated electrically so that it is subjected to uniform heat flux circumferentially and axially. The mean inlet and exit temperatures of the water are and , respectively. The mass flow rate of the water is 720 kg/h. Disregard the thermal resistance of the tube wall. The internal heat transfer coefficient is 1697 W/. Take specific heat of water as 4.179 kJ/kg. K. The inner surface temperature at the exit section of the tube is ________ (*round off to one decimal place*) .

## Question 55

Appeared in Year: *2019*

### Question

MCQ▾The wall of a constant diameter pipe of length 1 m is heated uniformly with flux q″ by wrapping a heater coil around it. The flow at the inlet to the pipe is hydrodynamically fully developed. The fluid is incompressible and the flow is assumed to be laminar and steady all through the pipe. The bulk temperature of the fluid is equal to at the inlet and at the exit. The wall temperatures are measured at three locations, P, Q and R as shown in the figure. The flow thermally develops after some distance from the inlet. The following measurements are made:

Point | P | Q | R |

Wall Temp () | 50 | 80 | 90 |

Among the locations P, Q and R, the flow is thermally developed at

### Choices

Choice (4) | Response | |
---|---|---|

a. | P and Q only | |

b. | P, Q and R | |

c. | Q and R only | |

d. | R only |