Which of the following is the unit of kinematic viscosity _________________?

Consider the following processes:
1. Extension of a spring
2. Plastic deformation of a material
3. Magnetization of a material exhibiting hysteresis
Which of the above process are irreversible?

Which of the following statements are correct for a throttling process?
1. It is an adiabatic steady flow process
2. The enthalpy before and after throttling is same
3. In the processes, due to fall in pressure, the fluid velocity at outlet is always more than inlet velocity

A Reversed Carnot Engine removes 50 kW from a heat sink. The temperature of the heat sink is 250 K and the temperature of the heat reservoir is 300 K. The power required of the engine is

A heat engine receives heat at the rate of 2500 kJ/min and gives an output of 12.4 kW. Its thermal efficiency is, nearly

One reversible heat engine operates between 1000 K and T₂ K and another reversible heat engine operates between T₂K and 400 K. If both the engines have the same heat input and output, then the temperature T₂ must be equal to

Consider the following statements for isothermal process:
1. Change in internal energy is zero
2. Heat transfer is zero
Which of the above statements is/are correct?

A system of 100 kg mass undergoes a process in which its specific entropy increases from 0.3 kJ/kg K to 0.4 kJ/kg K. At the same time, the entropy of the surroundings decreases from 80 kJ/K to 75 kJ/K. The process is:

Which one of the following statements is correct during adiabatic charging of an ideal gas into an empty cylinder from a supply main?

Consider the following systems :
1. An electric heater
2. A gas turbine
3. A reciprocating compressor
The steady flow energy equation can be applied to which of the above systems?

Consider the following conditions for the reversibility of a cycle:
1. The P and T of the working substance must not differ appreciably, from those of the surroundings at any state in the process.
2. All the processes, taking place in the cycle, must be extremely slow.
3. The working parts of the engine must be friction-free.
Which of the following conditions are correct?

A Carnot engine operates between 300 K and 600 K. If the entropy change during heat addition is 1 kJ/K, the work produced by the engine is:

1000 kJ/s of heat is transferred from a constant temperature heat reservoir maintained at 1000 K to a system at a constant temperature of 500 K. The temperature of the surroundings is 300 K. The net loss of available energy as a result of this heat transfer is:

The effects of heat transfer from a high temperature body to a low temperature body are:
1. The energy is conserved
2. The entropy is not conserved
3. The availability is not conserved
Which of the above statements are correct?

Which of the following statements pertaining to entropy are correct?
1. The entropy of a system reaches its minimum value when it is in a state of equilibrium with its surroundings
2. Entropy is conserved in all reversible processes
3. Entropy of a substance is least in solid phase
4. Entropy of a solid solution is not zero at absolute zero temperature

Consider the following statements:
1. Gases have a very low critical temperature
2. Gases can be liquefied by isothermal compression
3. In engineering problems, water vapour in atmosphere is treated as an ideal or perfect gas
Which of the above statements are correct?

The property of a thermodynamic system is:

Consider the following statements :
1. There is no change in temperature when a liquid is being evaporated into vapour.
2. Vapour is a mixed phase of liquid and gas in the zone between saturated liquid line and saturated vapour line.
3. The saturated dry vapour curve is steeper as compared to saturated liquid curve on a T-s diagram.
4. The enthalpy of vaporization decreases with increase in pressure.
Which of the above statements are correct?

The performance of a single stage reciprocating air compressor is evaluated by its:

In a two stage reciprocating air-compressor with a suction pressure of 2 bar and delivery pressure of 8 bar, the ideal intercooler pressure will be:

Consider the following motions :
1. Piston reciprocating inside an engine cylinder
2. Motion of a shaft between foot-step bearings
Which of the above can rightly be considered as successfully constrained motion?

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?

In a circular are cam with a roller follower, acceleration of the follower depends on
1. cam speed and location of centre of circular arc
2. roller diameter and radius of circular arc
Which of the above is/are correct?

A manufacturing company is selling a product for 15 per unit with variable cost of  10 per unit. The fixed cost of the asset is 50,000. How many units should be produced to breakeven?

Hot wire anemometer is used to measure_______________?

A gear of 28 cm pitch circle diameter has 40 teeth. The circular pitch will nearly be

Consider the following statements regarding gear tooth designing for gear drive :
1. Tooth profiles not designed as per ‘law of gearing’ will cause vibration and impact problems even at low speed.
2. As the gears go through their mesh, the pitch point must remain stationary on the line of centres.
3. In a correctly designed tooth profile, the line of action of successive instantaneous points of contact will pass through the stationary pitch point.
Which of the above statements are correct?

The flywheel of a steam engine has a radius of gyration of 1 m and mass 2000 kg. The starting torque of the engine is 2000 N-m. The kinetic energy of the flywheel after 10 seconds from start is

Consider two shafts connected with two gears as per the following options :
1. One on each shaft.
2. Through an intermediate gear mounted on an intermediate shaft, and every shaft having one gear only.
3. Through an intermediate gear mounted on an intermediate shaft having two gears, whereas the other shafts have one gear each
Which of the above represent(s) a simple gear train?

A riveting machine is driven by a constant-torque 3 kW motor. The moving parts including the flywheel are equivalent to 150 kg at 0.6 m radius. One riveting operation takes 1 second and absorbs 10000 N-m of energy. The speed of the flywheel is 300 r.p.m. before riveting. What is the speed (to nearest 10 r.p.m.) after riveting and what is the number of rivets that can be closed per minute?

Which one of the following statements is correct?

The thickness of the continuous weld used for connecting a horizontal square bar of 150 mm size and of cantilevered length 500 mm to a vertical plate, with the bar carrying a 25 kN vertical load at its outer tip, given that the permissible direct shear stress of the weld is 20 N/mm², is

A shaft of 50 mm diameter transmits a torque of 800 N-m. The width of the rectangular key used is 10 mm. The allowable shear stress of the material of the key being 40 MPa, the required length of the key would be

A governor is said to be hunting if the speed of the engine

The diameter of the pin in a bushed pin type flexible coupling is to be increased for the purpose of

The problem of interference in involute profile gears can be overcome by which one of the following means?

The bearing modulus for a bearing is 1628. What is the bearing characteristic number considered for bearing design?

Two shafts of diameter 30 mm each are connected by a flange coupling. Six bolts, each of diameter 8 mm, are used on a pitch circle of diameter 90 mm. If the allowable shear stress of the bolt material is 80 MPa, what is the torque transmitting capacity of the bolts to the nearest 10 units?

While selecting the elements of power transmission with speed reduction, the order of preference based on a minimum cost is

A spherical waterdrop of 1 mm in diameter splits up in air into 64 smaller drops of equal size. The surface tension coefficient of water in air is 0.073 N/m. The work required in splitting up the drop is

Consider the following statements pertaining to stability of floating bodies:
1. A floating body will be stable when the centre of gravity is above the centre of buoyancy.
2. The position of metacentres corresponding to different axes of rotation are generally different for the same floating object.
3. For cargo ships, the metacentric height varies with loading.
Which of the above statements are correct?

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

Consider the following statements:
1. At low Reynolds numbers of any flow, viscous forces dominate over inertial forces.
2. Transition from laminar to turbulent flow occurs over a range of Reynolds numbers depending on the surface presented to the flow.
Which of the above statements is/are correct?

In a steady laminar flow of a given discharge through a circular pipe of diameter D, the head loss is proportional to

The centre-line velocity in a pipe flow is 2m/s. What is the average flow velocity in the pipe if the Reynolds number of the flow is 800?

During a constant pressure expansion of a gas, 33.3% heat is converted into work while the temperature rises by 20 K. The specific heat of the gas at constant pressure as a proportion of work, W is

A system of 100 kg mass undergoes a process in which its specific entropy increases from 0.3 kJ/kg K to 0.4 kJ/kg K. At the same time, the entropy of the surroundings decreases from 80 kJ/kg K to 75 kJ/kg K. The process is

A reversible heat engine rejects 80% of the heat supplied during a cycle of operation. If the engine is reversed and operates as a refrigerator, then its coefficient of performance shall be

For the same efficiency of the Brayton cycle and the Carnot cycle working between temperature limits of T_max and T_min, the power contribution of the Brayton cycle will be

A heat engine working on the Carnot cycle receives heat at the rate of 50 kW from a source at 1300 K and rejects it to a sink at 400 K. The heat rejected is

An ideal gas is flowing through an insulated pipe at the rate of 3.3 kg. There is a pressure drop of 15% from the inlet to the outlet of the pipe. What is the rate of energy loss because of this pressure drop due to friction, given that R_gas= 0.287 kJ/kg K and the reference temperature T0 is 300 K?

A furnace is provided with an insulating refractory lining. The overall thermal conductivity of the material is 0.03 W/mK. The thickness of the lining is 100 mm. The inner and outer temperatures are 250°C and 50°C, respectively. The heat loss to the surroundings will be

A wall of 0.6m thickness has normal area of 1.5 m² and is made up of material of thermal conductivity 0.4 W/mK. If the temperature on the two sides of the wall are 800°C and 1000°C, the thermal resistance of the wall is

Heat is lost from a 100 mm diameter steam pipe placed horizontally in ambient air at 30°C. If the Nusselt number is 25 and the thermal conductivity of the air is 0.03 W/m K, then the heat transfer coefficient will be

Knocking in a spark ignition engine can be reduced by
1. retarding the spark
2. supercharging
3. increasing the engine speed
4. using a fuel of long straight chain structure Select the correct answer using the code given below.

A 4-cylinder diesel running at 1200 r.p.m. developed 18.6 kW. The average torque when one cylinder was cut out was 105 N m. If the calorific value of the fuel was 42000 kJ/kg and the engine used 0.34 kg of diesel/kW hr, the indicated thermal efficiency was nearly

In a Morse test on a 2-cylinder, 2-stroke SI engine, the brake power is 9 kW and the BHP of individual cylinders with spark cutoff are 4.25 kW and 3.75 kW, respectively. The mechanical efficiency of the engine is

Consider the following statements for refrigeration and air-conditioning:
1. In a refrigerating machine, the heat exchanger that absorbs heat is connected to a conditioned space.
2. A refrigerating cycle operating reversibly between two heat reservoirs has the highest coefficient of performance.
3. The lower the refrigeration required and the higher the temperature of heat rejection to the surroundings, the larger the power consumption.
Which of the above statements are correct?

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

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

If a submerged body displaced from its equilibrium position, returns to its original position, it is called __________.

In a flow measurement, a venturi meter is preferred over an orifice plate because _____.

Pitot tube measures ______.

Which of the following is not a property of an ideal fluid ?

Nozzle used in steam turbines convert ________.

Which of the following assumptions is the most relevant in air-standard cycle analysis ?

The modern Francis turbine is a ___________flow turbine .

Variation of stress with strain rate for a Newtonian fluid is ______ .

Which of the following is NOT a part of refrigeration systems ?

Which of the following is NOT an intensive property ?

Which of the following does NOT represent a unit of viscosity ?

__________ in the fuel is oxidised during knocking .

_________ is defined as the ability of a material to resist deformation under action of an external load .

Draught is produced in locomotive boilers by which of the following components ?

For a steady flow, the value of all fluid properties at any fixed point _________ .

For a floating body, if the metacentre is below the centre of gravity, then the body is said to be __________ equilibrium .

________ is useful for measuring flow of a conducting fluid .

A two- stroke engine consists of ________ port (s)

Air Cooling is mostly preferred for _________ .

_______ valves are provided in reciprocating compressors .