A fin will be more effective when Bio number is

A tank of length, breadth and height in the ratio of 2:1:2 is full of water. The ratio of hydrostatic force at the bottom to that at any larger vertical surface is

Which of the following fluids exhibit a certain shear stress at zero shear strain rate followed by a straight line relationship between shear stress and shear strain rate?

What is the specific gravity of a marble stone, which weighs 400N in air, and 200N in water? (g=10m/s²)

What is the intensity of pressure in the following SI units, when specific gravity of mercury is 13.6 and the intensity of pressure is 400KPa ?

Consider the following statements:
1.If a small upward displacement is given to a floating body, it results in the reduction of the buoyant force acting on the body
2.A slight horizontal displacement does not change either the magnitude or the location of the buoyant force 
Which of the above statements is/are correct? 

State whether following flow field is physically possible? 

In a differential manometer, a head of 0.5 m of fluid A in limb 1 is found to balance a head of 0.3 m of fluid B in limb 2. The atmospheric pressure is 760 mm of mercury. The ratio of specific gravities of A to B is

On which of the following just in time manufacturing philosophy emphasizes ?

In a stream line steady flow, two points A and B on a stream line are 1m apart and the flow velocity varies uniformly from 2m/s to 5m/s. What is the acceleration of fluid at B?

The stream function is given by Ψ = 3xy, then the velocity at the point (2,3) is

The boundary layer thickness at a given distance from the leading edge of a flat plate is

In a laminar flow through a circular pipe, the discharge varies

A fluid is flowing over a flat plate. At distance of 8 cm from the leading edge, the Reynolds number is found to be 25600. The thickness of the boundary layer at this point is

Air is flowing over a flat plate with a free stream velocity of 24 m/s, and its kinematic viscosity is 72 ×10^-6m²/s. If at a particular point, the Reynolds number is 30000, its location from the leading edge is

In a refrigerator, the evaporator and condenser coil temperatures are –33°C and 27°C, respectively. Assuming that the maximum COP is realized, the required power input for a refrigerating effect of 4 kW is
 

In a hydraulic coupling

Consider the following statements:
1.The wheel can be operated freely in air
2.Pressure at the exit of the nozzle is atmospheric
3.Pressure does not vary along the moving vanes
4.Change the direction of momentum imparts thrust over moving vanes Which of the following statements are applied to impulse turbine?

A water jet 0.0015m²in area issues from a nozzle with 15 m/s velocity. It is made to impinge perpendicular on to a plate that moves away from the jet with a velocity of 5 m/s. The force on the plate due to this impact is

Consider the following statements with regard to hydraulic turbines:
1.Kaplan turbines are most efficient at part load operations.
2.If n is the number of jets in a Pelton turbine, then the specific speed is proportional to n².
3.The flow ratio of Francis turbines are in the range of 0.1 – 0.3. 
Which of the above statements is/are correct? 

Which of the following is a Vector quantity ?

Bernoulli’s equation is applicable between any two points located in

Water flows through a smooth circular pipe of diameter D and length L because of a pressure difference ΔP across the length. The volume flow rate is Q and the flow is turbulent with Reynolds number 10⁵. If the pressure difference is increased to 4ΔP the volume flow rate will be

For laminar flow through a round pipe, the shear stress

Percentage clongation during tensile test is indicative of

Which of the above statements is not correct in the context of laminar flow through a pipeline?

Laminar flow between closely spaced parallel plates is governed by the consideration of which one of the following pair of forces?

Formation and collapse of vapour bubbles are believed to be the root cause for cavitation in hydraulic turbines. Most favorable condition for the formation of bubbles is set in the turbine at

For fully developed laminar flow through a circular pipe with Reynolds number Rethe friction factor is

The ratio of power outlet of the pump to the power input to the pump is known as

A pump is defined as a device which converts

The specific speed of a pump is defined as the speed of the unit of such a size that is

Negative slip occurs  in reciprocating pumps, when delivery pipe is

The pressure inside a soap bubble of 50 mm diameter is 25 N/m² above the atmospheric pressure. The surface tension in soap film would be

A Newtonian fluid is one which

Unlike the viscosity of fluids, the viscosity of gases increases with increasing temperature. This is due to

Manometer is a device used for measuring

When a dolphin glides through air, it experiences an external pressure of 0.75 m of mercury. The absolute pressure on dolphin when it is 5m below the free surface of the water is

Which of the above statements is correct?

A flownet is a graphical representation of streamlines and euqipotnetial lines such as these lines

Which of the above statements is correct for the velocity of potential?

Angle of diverging portion of the venturimeter is limited to 7°, because:
1.Flow decelerates in the diverging portion and pressure increases in the downstream direction. Hence, the fluid experience an adverse pressure gradient, if the divergence angle is large.
2 .Flow separation takes place due to adverse pressure gradient when divergence angle is large.
3 .If the divergence angle is large, a negative pressure is created at the throat which obstructs the flow of fluid. 
Which of the above reasons are correct? 

A gas is flowing through an insulated nozzle. If the inlet velocity of gas is negligible and there is an enthalpy drop of 45kJ/kg, the velocity of gas leaving the nozzle is 

Which of the above statements are correct for turbo-prop powered aircrafts?
1 .The propulsion efficiency of turbo-prop is higher than that of turbo-jet and rockets for low speeds up to about 800km/hr.
2.For the same thrust the turbine in the turbo prop aircraft is smaller than in the turbo-jet aircraft.
3.For the turbo-prop the flight velocity cannot exceed the jet velocity. 

If absolute jet exit velocity from a jet engine is 2800m/s and forward flight velocity is 1400m/s then propulsive efficiency is

An air-breathing aircraft is flying at an altitude where the air density is half the value at ground level. With reference to the ground level, the air fuel ratio at this altitude will be

Which of the above statements are correct for rockets?
1.Unlike the turbo-jet aircraft, in rockets the flight velocity can exceed the jet velocity.
2.In rockets gases having lower molecular weight increase the specific thrust.
3.In rockets the gases are expanded in the nozzle up to the atmospheric pressure. 

In a differential manometer a head of 0.6m of fluid A in limb 1 is found to balance a head of 0.3m of fluid B in limb 2. The ratio of specific gravities of A to B is

At x = 0, the function f (x) = |x| will be

The center of pressure of a plane submerged surface

A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6, what fraction of its volume is under mercury?

A right circular cylinder, open at the top, is filled with a liquid of specific gravity 1.2, and rotated about its vertical axis at such a speed that half of the liquid spills out. The pressure at the center of the bottom is

Consider the following statements about velocity potential:
1.Velocity potential is a vector function similar to stream function
2.It is a fully three dimensional function and not limited to two
coordinates
3.Velocity potential does not exist at stagnation points
4.Velocity potential exists only if the flow is irrotational 
Which of the above statements are correct? 

Principle mechanism of material removal in ECM?

In flow through a pipe, the transition from laminar to turbulent flow does not depend on

A 0.20m diameter pipe 20m long transports oil at a flow rate of0.01m³/s. Calculate power required to maintain flow if dynamic viscosity and density of oil is 0.08 Pas and 900 kg/m³ respectively

Pressure loss for laminar flow through pipeline is dependent

Fanno line is a flow in a constant area duct 

In an adiabatic flow with friction through a constant area duct, the following phenomenon are predicted:
1.The flow downstream tends to be sonic irrespective of the Mach-number upstream
2.In the case of initially supersonic flow, any increase in duct length beyond choked flow would make the exit flow subsonic
3.In the case of initially subsonic flow, any increase in duct length will not change sonic flow at the exit
4.The optimum pipe length for sonic outlet in supersonic flow is considerably longer than that of subsonic flow for the same flow rate 
Which of these are correct? 

In a reciprocating pump, air vessels are used to

Consider the following statements pertaining to centrifugal pumps:
1.The inlet to the impeller of a centrifugal pump is always axial, while the outlet may be radial or inclined.
2.The impeller may be shrouded on both sides with an eye at the centre and vanes curved backwards.
3.Impeller of double entry type has a balanced radial thrust.
4.Un-shrouded and part shrouded impeller are used only where high efficiency is unimportant. 
Which of these statements are correct? 

A centrifugal pump is fully primed, but on starting it fails to deliver fluid. Thr probable reasons are listed below:
1.Leaky foot valve or suction line
2.Suction head is very slow
3.Insufficient motor speed
4.Damaged or closed delivery valve 
Which of these reasons are correct? 

A centrifugal pump is to discharge 0.118 m³/s at speed of 1450 rpm against a head of 25m. The impeller diameter is 25cm, its width at outlet is 5cm and manometric efficiency is 75%. The vane angle at outer periphery of impeller is

A turbine is working under a head of 200m. The power developed by the turbine is 100kW and discharge through the turbine is 0.125 m³/s. In such case, the ratio of unit power to unit discharge for the turbine will be

Two geometrical similar pumps are running at 1000 rpm speed (both). If one pump has impeller diameter of 0.3m and discharges 20Ips against 20m head, and the other pump gives half of this discharge rate; calculate head and diameter of second pump

Frictional losses in the nozzle

In a nozzle designed for maximum discharge conditions, the flow velocity in the convergent section of the nozzle is

In the centrifugal compressor, the work input is equal to the sum of

For a centrifugal compressor with radial vanes, slip factor is the ratio of

The specific speed of a centrifugal compressor is generally

In a centrifugal compressor, the highest Mach number leading to shock wave in the fluid flow occurs at

The rating of the fuse wire is always expressed in

In an axial flow compressor, the ratio of pressure rise in the rotor blades to the pressure rise in the compressor in one stage is known as

CNC machine interpolator controls

If a row interchanged in the matrix, then the  determinant of matrix is

Water is coming out from a tap and falls vertically downwards. At the tap opening, the stream diameter is 20 mm with uniform velocity of 2 m/s. Assuming steady inviscid flow, constant pressure atmosphere everywhere, and neglecting curvature and surface tension effects, the diameter of the stream 0.5 m below the tap opening is nearly
 

A body of mass 20kg falls freely in vacuum. It has fallen through a vertical distance of 50m. The gravitational acceleration may be assumed as 10m/s². What is the thermodynamic work done by the body?

A closed gaseous system undergoes a reversible constant pressure process at 2bar in which 100 kJ of heat is rejected and the volume changes from 0.2m³ to 0.1m³. The change in the internal energy of the system is

A Carnot engines receives 100kJ of heat at 600K. Heat is rejected at 300K. The displacement volume is 0.2 m³. The mean effective pressure is

The ratio of static enthalpy rise in the rotor to the static enthalpy rise in the stage of an axial flow compressor is defined as:

The eigen values of a symmetric matrix are all

During a thermodynamic process, 100kJ of heat is transferred from a reservoir at 800K to a sink at 400K. The ambient temperature is 300K. the loss of available energy is

The vapor pressure of a liquid at any arbitrary temperature can be estimated approximately with the help of

In order to determine the quality of wet steam by a separating and throttling calorimeter, the steam should be first separated and then throttled such that the final state is

A rotor weighing 2 kN is supported on bearings A and B which are 1 m apart. The centre of mass of the rotor is at a distance 0.4 m from bearing A. It is observed that there is an unbalanced couple of magnitude 300 N-m which *leaves the shaft balanced statically. The dynamic reactions at the supports will be

A cam is a mechanical member used to impart a desired motion to a follower by direct contact. Which one of the under-listed follower motion types will produce the least jerk to the system?

The tendency of detonation is high in engines of larger cylinder diameter because of

An open cycle pressure gas turbine uses a fuel of calorific value 40,000 kJ/kg with airfuel ratio of 80 : 1 and develops a net output of 80kJ/kg of air. The thermal efficiency of the cycle is

Consider the following statements regarding cycles:
1.Stirling cycle consists of two isothermal and two adiabatic processes.
2.In vapor compression cycle, the refrigerant is in form of dry saturated vapor before entering compressor.
3.Diesel cycle consists of one constant pressure; one constant volume and two isentropic processes 
Which of the above statements are correct? 

The efficiency of vapor power Rankine cycle can be increased by
1 .Increasing the temperature of the working fluid at which heat is added
2.Increasing the pressure of the working fluid at which heat is added
3.Decreasing the temperature of the working fluid at which heat is rejected 
Which of the above statements are correct? 

The velocity of a gas flowing through a duct is 300 m/s; its temperature is 127°C; Gas constant R = 0.25 kJ/kg K, the ratio of specific heat is C_p/C_V = 𝛾 = 1.6. What is the value of Mach number?

When a system is taken from state ‘x’ to state ‘y’, 30kJ of heat flows into the system and the system does 10kJ of work. When the system is returned from ‘y’ to ‘x’ along another path, work done on the system is 8kJ. What is the amount of heat liberated or absorbed?

The values of heat transfer and work transfer for the processes of a thermodynamic cycle are given below:
Process                         Heat transfer                          Worktransfer
                                                (kJ)                                      (kJ) 
1                                        300                                          300
2                                         0                                             250
3                                      -100                                           -100
4                                       0                                               -250
The thermal efficiency of the cycle and the work ratio will be respectively