List of top Thermodynamics and Marine Engineering Questions on Marine Engineering asked in GATE NM

Consider the psychrometric process denoted by the straight line from state 1 to 2 in the figure. The specific humidity, Dry Bulb Temperature (DBT), and Wet Bulb Temperature (WBT) at the two states are shown in the table. The latent heat of vaporization of water \( h_{fg} = 2440 \, {kJ/kg} \). If the flow rate of air is 1 kg/s, the rate of heat transfer from the air is_________kW (rounded off to two decimal places).

 

Water of density \( \rho = 1000 \, {kg/m}^3 \) flows with a velocity \( V = 50 \, {m/s} \) through a 180° curved tube of uniform cross-section as shown in the figure. If the flow rate is \( 0.06 \, {m}^3/{s} \), the magnitude of the reaction force \( F_x \) required to keep it stationary is ________ kN (rounded off to one decimal place).

A tank with a constant water level of 4 m above the centreline of an opening of diameter 100 mm is shown in the figure. Neglect all losses and assume \( g = 9.81 \, {m/s}^2 \). The discharge through the opening is ________ litres/s (answer in integer).

A ship moving at a steady forward speed of \(10 \, {m/s}\) experiences a total resistance of \(140 \, {kN}\). The Quasi Propulsive Coefficient (QPC) is \(0.70\); the propeller shaft losses are \(5%\) and the mechanical efficiency of the main engine is \(80%\).
The indicated power of the main engine is ________ kW (rounded off to two decimal places).
A two-stroke four-cylinder large marine diesel engine has a cylinder bore of \(600 \, {mm}\) and stroke length of \(2400 \, {mm}\). The brake thermal efficiency (\( \eta_{{bth}} \)) is 45%, and fuel consumption rate (\( \dot{m}_f \)) is \(0.265 \, {kg/s}\) at an engine speed (\( N \)) of 100 rpm. Assuming the calorific value of fuel is \(42 \, {MJ/kg}\), the brake mean effective pressure (bmep) is ________ bar (rounded off to one decimal place).

Consider the psychrometric process denoted by the straight line from state 1 to 2 in the figure. The specific humidity, Dry Bulb Temperature (DBT), and Wet Bulb Temperature (WBT) at the two states are shown in the table. The latent heat of vaporization of water \( h_{fg} = 2440 \, {kJ/kg} \). If the flow rate of air is 1 kg/s, the rate of heat transfer from the air is _________ kW (rounded off to two decimal places).


 

Water of density \( \rho = 1000 \, {kg/m}^3 \) flows with a velocity \( V = 50 \, {m/s} \) through a 180° curved tube of uniform cross-section as shown in the figure. If the flow rate is \( 0.06 \, {m}^3/{s} \), the magnitude of the reaction force \( F_x \) required to keep it stationary is ________ kN (rounded off to one decimal place).

A tank with a constant water level of 4 m above the centreline of an opening of diameter 100 mm is shown in the figure. Neglect all losses and assume \( g = 9.81 \, {m/s}^2 \). The discharge through the opening is ________ litres/s (answer in integer).

Which of the following components is/are NOT found in a two-stroke marine diesel engine?
Which one of the following is the most common type of gear assembly used for coupling steam turbine and propeller shafts?
In ships, a flash evaporator is used to obtain ________.
For marine engine shafts subjected to high radial and axial thrust loads, which one of the following types of bearings is the most suitable?
A ship moving at a steady forward speed of \(10 \, {m/s}\) experiences a total resistance of \(140 \, {kN}\). The Quasi Propulsive Coefficient (QPC) is \(0.70\); the propeller shaft losses are \(5\%\) and the mechanical efficiency of the main engine is \(80\%\).
The indicated power of the main engine is ________ kW (rounded off to two decimal places).
A two-stroke four-cylinder large marine diesel engine has a cylinder bore of \(600 \, {mm}\) and stroke length of \(2400 \, {mm}\). The brake thermal efficiency (\( \eta_{{bth}} \)) is 45%, and fuel consumption rate (\( \dot{m}_f \)) is \(0.265 \, {kg/s}\) at an engine speed (\( N \)) of 100 rpm. Assuming the calorific value of fuel is \(42 \, {MJ/kg}\), the brake mean effective pressure (bmep) is ________ bar (rounded off to one decimal place).
A ship has a propeller of 5 m pitch rotating at 120 rpm. The ship travels at 8 m/s and the wake fraction is 0.25. The apparent slip ratio and real slip ratio are ________ respectively.
Which of the following boiler arrangements will ensure that there is NO contamination of the primary feed system?