Carnot Cycle consists of
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Carnot Cycle consists of
One reversible heat engine operates between $$1600^\circ$$K and $$T_{2}^\circ$$K and another reversible heat engine operates between $$T_{2}^\circ$$K and $$400^\circ$$K. If both the engines have the same heat input and output, then temperature $$T_{2}^\circ$$ is equal to
Isentropic flow is
Reversed Joule cycle is known as
The thermal efficiency of Gas turbine plant is
A 100 W electric bulb was switched on in a $$2.5 m \times 3m \times 3 m$$ size thermally insulated room having temperature of $$20^\circ$$C. The room temperature at the end of 24 hrs. will be
A solar energy based heat engine which receives 80 kJ of heat at $$100^\circ$$C and rejects 70 kJ of heat to the ambient at $$30^\circ$$C is to be designed. The thermal efficiency of heat engine is
A mixure of gases expand from $$0.03 m^{3} to 0.06 m^{3}$$ at constant pressure of 1 MPA and absorb 84 kJ of heat during the process. The change in internal energy of the mixture is
If the concentrated load applied at the free end of a cantilever beam is doubled along with its length and moment of inertia also, then the deflection at free end will increase by
In the case of a beam simply supported at both ends, if the same load instead of being concentrated at centre is distributed uniformly throughout the length, then deflection at
centre will get reduced by
If the Bending moment is increased three times, then to keep the stress in the beam same, sectional modulus shall be
A beam with rectangular section of $$120 mm \times 40 mm$$ is placed horizontally by mistake, (with width as 120 mm and depth as 40 mm) whereas it was designed to be placed vertically. (with width as 40 mm and depth as 120 mm). The ratio of section modulus will be
If a shaft is required to transmit twice the power at twice the speed for which it is designed, its diameter must
The strength of a hollow shaft in comparison to solid shaft, both having outer diameter D and inner diameter of hollow shaft as $$\frac{D}{2}$$
Steel bar of $$40 mm \times 40 mm$$ square section is subjected to an axial compressive load of 200 kN. If the length of the bar is 2 m and E (Youngs modulus) = 200 GPa. The elongation of bar will be
The shear force diagram for a simply supported beam carrying uniformly distributed load of w per unit length, consists of
The power transmitted by a shaft 60 mm diameter at 180 RPM, if the permissible stress is $$85 N/mm^{2}$$
A material has a young’s modulus of $$1.25 \times 10^{5}$$ $$\frac{N}{mm^{2}}$$ and a poisson’s ratio of 0.25. The bulk modulus of the material will be
Neutral solution is one which has pH value
Forced feed lubrication system means that oil is delivered to the engine by
The purpose of thermostat in an engine cooling system is to
In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kj. If the calorific value of coal is 2050 $$\frac{kj}{KGg}$$, then boiler efficiency will be
A throttle governed steam engine develops 15 kW with 280 kg power of steam and 35 kW with 520 kg per hour of steam. The steam consumption in kg per hour when developing 20 kW of power will be nearly
A fluid which obeys Newton’s law of viscosity is termed as
A water tank contains 1.3 m deep water. The pressure exerted by water per metre length of tank is
The gauge pressure at the surface of a liquid of density 900 $$\frac{Kg}{m^{3}}$$ is 0.4 bar. If the atmospheric pressure is $$1 \times 10^{5}pa$$ the absolute pressure at a depth of 50 M is
In Hydro-Electric plants, power transmitted through pipe is maximum when the head lost due to friction is
Reynolds number is ratio of Inertial forces to
A pelton wheel develops 1750 kW under a head of 100 mts while running at 200 rpm and discharging 2500 litres of water per sec. The unit power of wheel will be
Power required to drive a centrifugal pump is
The specific speed of a centrifugal pump delivering 810 Litres of water per sec. against head of 16 mts. at 725 RPM is
A centrifugal pump delivers 1000 lts per minute at 2000 RPM against total head of 50 mts. and requires 32 BHP for its operation. If speed is reduced to 1000 RPM, the discharge and head developed will be
A flow is said to be supersonic, if the
Fouling factor is used in heat exchangers due to
In a Counter flow heat exchanger design, fluid rates and specific heats were chosen in such a manner that heat capacities of both the fluids are same. A hot fluid enters at $$100^\circ$$ C and leaves at $$60^\circ$$C. The cold fluid enters heat exchanger at $$40^\circ C$$. The mean temperature difference between the two fluids is
The unit of overall coefficient of heat transfer is:
The heat transfer by conduction through a thick cylinder of inner radius $$r_{1}$$ ,outer radius $$r_{2}$$, Higher temperature $$T_{1}$$,lower temperature $$T_{2}$$, length of cylinder l and thermal conductivity k is given by:
According to Stefan-Boltzmann law, the total radiation from black body per second per unit area is directly proportional to the
In a condenser of a power plant, the steam condenses at temperature of $$60^\circ$$ C. The cooling water enters at $$30^\circ$$C and leaves at $$45^\circ$$C. The logarithmic mean temperature difference will be around
In shell and tube heat exchanger, baffles are mainly used for
For a glass plate, transitivity and reflectivity are specified as 0.86 and 0.08 respectively, the absorptivity of the glass plate is
A composite slab has two layers of different materials with thermal conductivities $$k_{1}$$ and $$k_{2}$$. If each layer has same thickness, then the equivalent thermal conductivity will be:
The ratio of heat flow $$\frac{Q_{1}}{Q_{2}}$$ from two walls of same thickness having their thermal conductivities as $$K_{1} = 2K_{2}$$ will be:
In case of saddle key, power is transmitted by means of
The angle of twist for a transmission shaft is inversely proportional to
Two mating spur gears have 40 and 120 teeth respectively. The pinion transmits at 1200 rpm and transmits a torque of 20 N-m. The torque transmitted by gear is:
The expected life of a ball bearing subjected to a load of 9800 N and operating at 1000 RPM is 3000 hrs. What is the expected life of the same bearing for similar load of 4900 N and speed of 2000 RPM
Neutral axis of a beam is;
A Gas engine has a swept volume of $$300 cm^{3}$$ and its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. The volume of mixture taken in per stroke is
The ratio of the brake power to indicated power is called
A heat engine is supplied with 250 $$\frac{KJ}{s}$$ of heat at a constant fixed temperature of $$227^\circ$$C. The heat is rejected at $$27^\circ$$C. If the cycle is reversible, the amount of heat rejected is :
A heat Engine gives an output of 3 kW when the input is 10000 $$\frac{joules}{sec}$$. The thermal efficiency of the engine is
A base load power station of capacity 35 MW has annual output of $$150 \times 10^{6}$$ kWh. The plant capacity factor of the power plant is
Diesel engine having brake thermal efficiency of 30% and the calorific value of fuel used is 10000 $$\frac{kcal}{kg}$$, the brake specific fuel consumption will be
The control rods in the control system of nuclear reactors are used to
Efficiency of Carnot engine is 80%. If the cycle direction is reversed, what will be the value of COP of reversed Carnot cycle
If the evaporator temperature of a refrigeration plant is lowered, keeping condensing temperature constant, the horse power requirement of compressor will
For Ammonia refrigeration system, the pipe for carrying refrigerant shall be made of following material:
In psychrometric chart, relative humidity lines are:
The operating temperature of a cold storage is $$-9^\circ$$C and load for the refrigeration plant is 20 kW for ambient temperature of $$24^\circ$$C. The actual COP of the plant used is one fourth that of ideal plant working between the same temperatures. The power required to drive the plant is:
The formation of frost on cooling coils in a refrigerator
The effect of Sub cooling in a refrigeration cycle will result in
In order to cool and dehumidify a stream of moist air, it must be passed over the coil at a temperature
In a chemical dehumidification process, the dry bulb temperature of air
The atmospheric air at dry bulb temperature of $$15^\circ$$C enters a heating coil maintained at $$40^\circ$$C. The air leaves the heating coil at $$25^\circ$$C. The by-pass factor of the heating coil is
A grinding wheel of 150 mm diameter is rotating at 3000 rpm. The grinding speed is :
The angle made by the face of the tool and the plane parallel to the base of cutting tool is called
When the metal is removed by erosion caused by rapidly recurring spark discharges between the tool and work, the process is known as
In order to double the period of a simple pendulum, the length of the string should be :
In a multiple V-belt drive system, when a single belt is damaged, it is preferable to change the complete set in order to
Mohan is five times older than his son. After 4 years the sum of their ages will be 44 years. Find the present age of Mohan?
For a sphere of radius 10 cm, the numerical value of surface area is what percent of numerical value of its volume?
A man bought a house and a cart. If he sells the house at 10% loss and cart at 20% gain, he will not lose anything. But, if he sells the house at 5% loss and cart at 5% gain he would lose Rs.100. The amount paid by him for the house and cart will be?
Average marks of 15 students in a class is 145, maximum marks being 150. If two lowest scores are removed, the average increases by 5. Also two lowest scores are consecutive
multiples of 9. What is the lowest score in the class?
In a mixture of wheat and barley, wheat is 60% of 400 kg of mixture. Further, some quantity of barley is added and percentage of wheat becomes 53 $$\frac{1}{3}$$ % .How many kg of barley is added?
I see an object 3 kms to east and 4 kms to north. It appears to be moving at 1 km per minute in south west direction. At what speed (km per minute) is it getting closer to me?
Eigen values of a $$4 \times 4$$ matrix [A] are given as 2, -3, 13 and 7. Then, what is the value of
$$\mid det[A] \mid$$?
The mean value of a function f(x) from point ‘a’ to point ‘b’ is given by
The area of a circle of radius ‘a’ can be found by following integral
In a box there are 5 red balls, 3 blue balls and 2 green balls. If a ball is selected at random what is the probability that it is blue or green?
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