Which one of the following thermodynamic processes approximates the steaming of food ina pressure cooker ?
Ice kept in a well insulated thermo flask is an example of which system ?
For a simple closed system of constant composition, the difference between the net heat and work interactions is identifiable as the change in
Assertion (A) : Thermodynamic work is path–
dependent except for an adiabatic process.
Reason (R) : It is always possible to take a
system from a given initial state to any final state
by performing adiabatic work only.
Which one of the following is correct ?
The cyclic integral of (dQ –dW) for a process is
The variables which control the physical properties of a perfect gas are
In an isothermal process
In a free expansion process
The isothermal and adiabatic process are regarded as
The efficiency of Joule cycle is
In a vapour compression refrigeration system, throttle valve is used in place of an expander because
Vapour absorption refrigeration system works using the
In a 3 ton capacity water cooler, water enters at 30ºC and leaves at 15ºC steadily. What is the water flow rate per hour ?
The correct sequence of the given components of a vapour compression refrigerator is
Where is an air refrigeration cycle generally employed ?
The subcooling in a refrigeration cycle
A vapour absorption refrigeration system
Which gas power cycle consist of four processes during which work alone is transferred during which work alone is transferred during two processes and heat alone is transferred during the other two processes ?
Divided chamber diesel engines use lower injection pressure compared to open chamberengines because
The tendency of knocking in CI engine reduced by
The discharge of hydrocarbons from petrol automobile exhaust is minimum when the vehicle is
Which one of the following fuels can be obtained by fermentation of vegetable matter ?
Which one of the following automobile exhaust gas pollutants is a major cause of photochemical smog ?
When a hydrocarbon fuel burns is excess air orsat analysis of products of combustion will show
Of all power plants, hydel is more disadvantageous when one compares the
In thermal power plants, the deaerator is used mainly to
The degree of reaction of a turbine is defined as the ratio of
The expression for the maximum efficiency of a Parson's turbine is (a is the angle made by
absolute velocity at inlet)
The degree of reaction of an impulse turbine
With natural uranium, which of the following is used as moderator ?
A safety valve mainly used with locomotive and marine boilers is
A device used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit, is called
In a boiler, the heat is lost
The fittings mounted on the boiler for its proper and safe functioning is a
Which one of the following sequences indicates the correct order for flue gas flow in the steam power plant layout ?
Statement (I) : A small insect can sit on the free surface of a liquid though insect's density is higher than that of the liquid.
Statement (II) : Liquids have viscosity
In the boundary layer, the flow is
For an irrotation flow, the velocity potential lines and the streamlines are always
The instrument preferred in the measurement of highly fluctuating velocities in air flows is
A venturi meter is a device based on the bernoulli principle and is used for measuring
The loss of head due to sudden enlargement is attributed to
For laminar flow through a pipe, the discharge varies
Why are surge tanks used in pipe line ?
The correct sequence of the given hydraulic turbines in decreasing order of their specific speeds is
With an increase in size of tube, the rise or depression of liquid in the dube due to surface tension will
A differential can be used to measure
In one dimensional flow, the flow
The forces which do not meet at one point and their lines of action do not lie on the same plane are known as
The point, through which the whole weight of the body acts, irrespective of its position, is known as
The moment of inertia of a square of side (a) about an axis through its centre of gravity is
Which of the following is a scalar quantity ?
A rod of length l tapers uniformly from a diameter D at one end to a diameter d at the other. The Young's modulus of the material is E. The extension caused by an axial load P is
What are the normal and shear stresses on the 45º planes shown ?
What is the safe working pressure for a spherical pressure vesel 1.5 m internal diameter and 1.5 cm wall thickness, if the maximum allowable tensile stress is 45 MPa ?
Which one of the following portions of the loaded beam shown in the given figure is subjected to pure bending ?
Match List-I (End conditions of columns) with List-II (Lowest critical load) and select the
correct answer using the codes given below the lists:
Strain energy stored in a body of volume V subjected to uniform stress s is
Every direct stress is always accompanied by a strain in its own direction and an opposite kind of stain in every direction, at right angles to it. Such a strain is known as
When a rectangular bar of length l, breadth b and thickness t is subjected to an axial pull of P,
then linear strain (e) is given by
A concentrated load is one which
When shear force at a point is zero, then bending moment is .......... at that point.
The Young's modulus of a material is 125 GPa and Poissons ratio is 0.25.The modulus rigidityof the material is
The shear force at the centre of a simply supported beam with a gradually varying load from zero at both ends to w per metre at the centre , is
When a slider moves with a velocity 'V' on a link rotating at an angular speed ofw the Coriolis
component of acceleration is given by
The choice of displacement diagram during rise or return of a follower of a cam-follower mechanism is based on dynamic considerations. For high speed cam follower is
In a slider-crank mechanism, the velocity of piston becomes maximum when
Where r = crank radius, ω = crank speed, n = Obliquity ratio
Velocity of slider will be maximum at θ = 90°, (∵ sin function is maximum at 90° i.e. sin 90° = 1)
∴ Vmax = rω(1 + 0) = rω
When θ = 90°, i.e. crank is perpendicular to the line of stroke, the velocity of the slider is maximum.
A reverted gear train is one in which the output shaft and input shaft
Which of the following is a turning pair ?
A combination of kinematic pairs, joined in such a way that the relative motion between the links is completely constrained, is called a
The method of obtaining different mechanisms by fixing in turn different links in a kinematic chain, is known as
The mechanism in which two are turning pairs and two are sliding pairs, is called a
Which of the following is an inversion of a single slider crank chain ?
When two links are connected by a pin joint, there instantaneous centre lies
If the size of a standard specimen for fatigue testing machine is increased the endurance limit for the material will
Disruptive strength is the maximum strength of a metal, when
The bolts in a rigid flanged coupling connecting two shafts transition power are subjected to
The railway carriage couplings have
The acme threads are usually found on
Which of the following has threads at both ends ?
The washer is generally specified by its
Magnetic forming is an example of
Match List-I (Type of Forging) with List-II (Operation) and select the correct answer using
the codes given below the lists:
What does hydrostatic pressure in extrusion process improve ?
Which one of the following metal forming processes is not a high energy rate forming processes ?
The correct sequence of the given processes in manufacturing by powder metallurgy is
Arc blow is more common in
In which of the following welding process flux is used in the form of granules ?
Lathe machine with turret can turn a work piece of limited length only because
Tool life increases with increase in
The most important function of the cutting fluid is to
The mode of deformation of the metal during spinning is
The increase in hardness due to cold working, is called
When the molten metal is fed in the cavity of a metallic mould by gravity, the method of casting is known as
The negative rake is usually provided on
Flank wear occurs on the
Which of the following property is desirable for materials used in tools and machines ?
The property of a material due to which it breaks with little permanent distortion, is called
Malleable cast iron is produced
Connecting rod is , usually, made from
Which of the following is a point imperfection ?