An ideal gas at 27ºC is heated at constant pressure till its volume becomes three times. What would be then the temperature of gas?
Measurement of temperature is based on which law of thermo dynamics?
Hot coffee stored in a well insulated thermos flask is an example of
Which one of the following expresses the reversible work done by the system (steady flow)
between states 1 and 2?
A closed system receives 60 kJ heat but its internal energy decreases by 30 kJ. Then the work done by the system is
Work transfer between the system and the surroundings
The value of for an irreversible cycle is
One Joule (J) is equal to
1 joule (J) = 1.00 newton meters (N-m)
The temperature at which the volume of a gas becomes zero is called
The molecular mass expressed in gram (i.e. 1 gmole) of all gases, at N. T. P., occupies a volume of
The sum of internal energy (U) and the product of pressure and volume (p.v) is known as
Carnot cycle has maximum efficiency for
A refrigeration system
The C.O.P. of a refrigerator working on a reversed Carnot cycle is where
T1 = Lowest absolute temperature, and
T2 = Highest absolute temperature
The leakage in a refrigeration system using freon is detected by
The COP of a heat pump βhp and the COP of a refrigerator βRef are related as
In electrolux refrigerator
The correct sequence of the given four cycles on T-s plane in figure 1, 2, 3, 4 is
An Otto cycle has a compression ratio of 8. If 250 kJ of work is extracted from the cycle, the heat rejected by the cycle is
The two reference fuels used for cetane rating are
The stoichiometric air-fuel ratio for petrol is 15 :
1. What is the air-fuel ratio regarded for maximum power ?
Match List-I (SI Engine Operating Mode) with List –II (Appromimate A/F Ratio) and select the correct answer using the code given below the lists
A spark plug gap is kept from
The ignition quality of petrol is expressed by
Which of the following is not a boiler mounting?
The function of a safety valve is
An air preheater is installed
Match List-I (Type of boiler) with List-II (Classification of boiler) select the correct answer
using the codes given below the lists:
Benson boiler is one of the high pressure boilers having
The draught in locomotive boilers is produced by
The function of economizer in a boiler is to
The critical pressure ratio for maximum discharge through a nozzle is given by
Surging basically implies
Phenomenon of chocking in compressor means
The instantaneous centre of rotation of a rigid thin disc rolling on a plane rigid surface is located at
A four-bar chain has
Which one of thefollowing conversions is used by a lawn-sprinkler which is a four barme chanisms?
Which one of the following drives is used for a constant velocity ratio, positive drive with large centre distance between the driver and driven shafts?
The number of degrees of freedom of an epicyclic gear train is
In which one of the following is a fly wheel generally employed?
The motion between a pair when limited to a definite direction, irrespective of the direction of force, applied, is known as
Which of the following is an example of a higher pair?
The relation between number of pairs (P) forming a kinematic chain and the number of links (l)
The design calculations for members subject to fluctuating lads with the same factor of safety yield the most conservative estimates when using
When a nut is tightened by placing a washer below it the bolt will be subjected to
In a fillet welded joint, the weakest area of the weld is
18/8 steel contains
An aluminium member is designed on the basis of
Guest's theory is used for
The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kv as
The dimensions of surface tension are
If the surface tension of water air interface is 0.073 N/m, the gauge pressure inside a rain drop
of 1 mm diameter will be
When can a piezometer be not used for pressure measurement in pipes?
Three immiscible liquids of specific densities ρ , 2ρ and 3ρ are kept in a jar. The height of the liquids in the jar and at the piezo meter fitted to the bottom of the jar are as shown in the figure below.
The ratio H/h is.
The critical value of Reynolds number for transition from laminar to turbulent boundary layer in external flows is taken as
The head loss in turbulent flow in pipe varies
Laminar flow between closely spaced parallel plates is governed by the consideration of which one of the following pair of forces?
A centrifugal pump gives maximum efficiency when its blades are
A manometer is used to measure
When a body is placed over a liquid, it will float if
The discharge through a large rectangular orifice is given by
where H1= Height of the liquid above the top of the orifice,
H2= Height of the liquid abvoe the bottom of the orifice,
b = Breadth of the orifice, and
Cd= Coefficient of discharge
The coefficient of viscosity may be determined by
The unit discharge through the turbine is
The deformation of a bar under its own weight as compared to that when subjected to a direct axial load equal to its own weight will be
What is the relationship between the linear elastic properties; Young's modulus (E), rigidity modulus
(G) and bulk modulus (K)?
Which one of the following mohr's circles represents the state of pure shear?
Auto frettage is the method of
A simply supported beam is loaded as shown in the figure below.
The maximum shear force in the beam will be
The ratio of the compressive critical load for a long column fixed at both the ends and a column with one end fixed and the other end free is
A short column of external diameter D and internal diameter d carries an eccentric load W.
The greatest eccentricity which the load can be applied without producing tension on the crosssection of the column would be
The Poisson's ratio for cast iron varies from
The relation between Young's modulus (E), shear modulus (C) and bulk modulus (K) is given by
The point of contraflexure occurs in
The slenderness ratio is the ratio of
Fatigue test is carried out for
According to lami's theorem
A couple produces
The ratio of static friction to dynamic friction is always
A framed structure as shown fig. is a
Eutectoid reaction occurs at
Addition of magnesium to cast iron increases its
Consider the following quenching media:
The correct sequence of these media in order of increasing hardness of steel ounder going heat
Gunmetal, which is used in journal bearings, contains
A sand casting mould assembly is shown in the given figure. The elements marked A and B are respectively
The process of removing the burrs of flash from a forged component in drop forging is called
Which one of the following processes is the wire drawing process?
High speed electron beam of electron beam welding is focused on the weld spot using
The ratio between Oxygen and Acetylene gases for neutral flame in gas welding is
The instrument or device used to measure the cutting forces in machings is
Which of the following property is desirable in parts subjected to shock and impact loads?
18 - 4 - 1 high speed steel contains
The type of tool used on lathe, shaper and planer is
Flank wear occurs mainly on the
Cutting fluids are used to
The tool life is said to be over if
A mandrel is used to hold
In a planer
Surface grinding is done to produce
A simply supported beam 'A' of length l, breadth b and depth d carries a central load W. Another beam 'B' of the same dimensions carries a central load equal to 2 W. The deflection of beam 'B' will be __________ as that of beam 'A'.