Description : The draught may be produced by a_________ a) Chimney b) Mechanical fan c) Steam jet d) All of the above
Last Answer : d) All of the above
Description : The relative heat absorption for successively added equal areas of boiler convection heating surfaces__________ (A) Increases (B) Decreases (C) Remain unaffected (D) First increases and then decreases
Last Answer : (B) Decreases
Description : When gas changes to liquid through the process of condensation, the temperature A] Increases. B] Decreases C] Remains constant. D] None of the mentioned
Last Answer : C] Remains constant.
Description : The draught in locomotive boilers is produced by a ___________ a) Chimney b) Centrifugal fan c) Steam jet d) All of the above
Last Answer : c) Steam jet
Description : An economiser in a boiler........ A]Increases steam pressure. B]Increases steam flow C]Decreases fuel consumption D]Decreases steam pressure
Last Answer : C]Decreases fuel consumption
Description : The following is the correct order of energy conversion in thermal power plants a. Chemical energy - Mechanical energy - Electrical energy b. Mechanical energy - Chemical energy - Electrical energy c ... - Mechanical energy - Electrical energy d. Heat energy - Electrical energy - Mechanical energy.
Last Answer : a. Chemical energy – Mechanical energy – Electrical energy
Description : A boiler is a device used to create steam by applying __________to water a) Light energy b) heat energy c) Wind energy d) mechanical energy
Last Answer : b) heat energy
Description : With increase in compression ratio, the efficiency of the otto engine (A) Increases (B) Decreases (C) Remain constant (D) Increases linearly
Last Answer : (A) Increases
Description : Rankine cycle efficiency in a good steam power station may be in the range between........ a.15% - 20% b.35% - 40% c.50% - 60% d.90% - 95%
Last Answer : b.35% - 40%
Description : The product of efficiency & heat transferred to the working fluid is? a. Net temperature change b. Net work done c. Net enthalpy change d. None of the mentioned
Last Answer : b. Net work done
Description : Why single boiler unit per turbine is equipped commonly? • For better turbine control • To reduce the cost • For overcoming losses of power • To improve the efficiency
Last Answer : • For better turbine control
Description : Boiler efficiency is a measure of how effectively _______ energy in fuel is converted into heat energy in steam going to the turbines A Chemical energy B Heat energy C Thermal energy D All of the above
Last Answer : A Chemical energy
Description : The economiser is used in boilers to........ A]Increase thermal efficiency of boiler B]Economise on fuel C]Extract heat from the exhaust the gases D]Increase flue gas temperature
Last Answer : A]Increase thermal efficiency of boiler
Description : When the bubbles of steam are produced? • Once the water reaches saturation temperature • Once the water starts evaporating • Once the temperature decreases • None of the above
Last Answer : • Once the water reaches saturation temperature
Description : If steam is pressurized _____ • It occupies more space • It occupies less space • Both are correct • None of the above
Last Answer : • It occupies less space
Description : A boiler or steam generator is a device used to create steam by applying heat energy to _____. • Water • Petrol • Oil • All of the above
Last Answer : • Water
Description : Once the condensate reaches the _____ , it becomes available to the boiler for recycling. • Condenser • Turbine • Boiler • Generator
Last Answer : • Boiler
Description : A steam and condensate system represents a _____ loop. • Discontinuous • Continuous • None of the above • All of the above
Last Answer : • Continuous
Description : What happens when air dissolves in condensate? a) non corrosive b) temperature of air increases c) corrosive d) none of above
Last Answer : c) corrosive
Description : Adiabatic process is (A) Essentially an isentropic process is___________ (B) Non-heat transfer process (C) Reversible process (D) Constant temperature process
Last Answer : (B) Non-heat transfer process
Description : What is the function of boiler? • To burn the fuel in a confined closed system With the supply of air • To generate steam in varying pressure • To generate steam at constant pressure • To produce flue gases by burning fuel at a given pressure
Last Answer : • To generate steam at constant pressure
Description : When vapour is cooled at constant total system volume, the _______ changes. A] Volume. B] Pressure C] Temperature. D] None of the mentioned
Last Answer : B] Pressure
Description : With increase in compression ratio, the volumetric efficiency of air compressor (A) Increases (B) Decreases (C) Remain same (D) May increase or decrease (depends on the suction pressure)
Last Answer : Option A
Description : What kind of energy output is obtained from a ‘Steam Power Plant’? a. Heat energy b. Sound energy c. Electricity d. Thermal energy
Last Answer : c. Electricity
Description : Temperature of the product during ultrafine grinding (A) Increases (B) Decreases (C) Remain constant (D) May increase or decrease; depends on the material being ground
Description : All resistances during washing of cake (A) Increases (B) Decreases (C) Remain constant (D) None of these
Last Answer : (C) Remain constant
Description : The filtrate flow rate in constant pressure filtration (A) Continuously increases (B) Continuously decreases (C) Remain constant throughout (D) May increase or decrease; depends on the pressure
Last Answer : (B) Continuously decreases
Description : Under conditions of flooding in packed tower, the gas pressure drop (A) Decreases rapidly (B) Increases rapidly (C) Remain constant (D) Is maximum
Last Answer : (D) Is maximum
Description : With lapse of time, the overhead composition of light component in case of batch distillation with constant reflux (A) Increases (B) Decreases (C) Remain same (D) May increase or decrease; depends on system
Description : With increase in the mass velocity of the gas, the rate of drying during the constant rate period __________, if the conduction and radiation through the solid are negligible. (A) Increases (B) Decreases (C) Remain same
Description : For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area (A) Increases (B) Decreases (C) Remain constant (D) Passes through a maxima
Last Answer : (D) Passes through a maxima
Description : The film thickness for laminar film condensation on vertical surface __________ from top to bottom. (A) Cumulatively increases (B) Cumulatively decreases (C) Remain constant (D) And the surface conductance increase
Last Answer : (A) Cumulatively increases
Description : As the temperature of ice rises, the ice melts and its density? A. Decreases B. Remain constant C. Increases (Answer) D. Increases upto 10C
Last Answer : C. Increases (Answer)
Description : With increase in temperature, the thermal conductivity of non-metallic amorphous solids (A) Decreases (B) Increases (C) Remain constant (D) First decreases upto certain temperature and then increases
Last Answer : (B) Increases
Description : The absorptivity of a grey body at a given temperature __________ with increasing wavelength of radiation. (A) Increases (B) Decreases (C) Remain constant (D) May increase or decrease; depends on the material
Last Answer : (D) May increase or decrease; depends on the material
Description : In a single evaporator system, the steam economy __________ by creating vacuum in the evaporator. (A) Increases (B) Decreases (C) Remain constant (D) May increase or decrease, depends on the vacuum
Description : With increase in temperature, the thermal conductivity of most liquids (A) Increases (B) Decreases (C) Remain same (D) First increases upto a certain temperature and then becomes constant
Last Answer : (C) Remain same
Description : C.V. (kcal/Nm3 ) of gaseous fuels __________ with increase in molecular weight. (A) Decreases (B) Increases (C) Remain constant (D) May increase or decrease, depends on combustibles
Last Answer : (D) May increase or decrease, depends on combustibles
Description : During coking of coal, the ash content (percentage) (A) Increases (B) Decreases (C) Remain constant (D) None of these
Description : For water, when the pressure increases, the viscosity (A) Also increases (B) Decreases (C) Remain constant (D) First decreases, and then increases
Last Answer : (D) First decreases, and then increases
Description : With increase in the temperature, viscosity of a liquid (A) Increases (B) Decreases (C) Remain constant (D) May increase or decrease; depends on the liquid
Description : With increase in temperature, the vapor pressure of liquids (A) Increases (B) Increases linearly (C) Decreases (D) Remain constant
Description : With increase in the ratio of orifice diameter to pipe diameter in case of an orificemeter, the overall pressure loss (A) Decreases (B) Increases (C) Remain constant (D) Increases linearly
Description : With the increase in depth, the hydrostatic pressure in an un-accelerated incompressible fluid (in a constant gravitational field) (A) Decreases (B) Increases linearly (C) Increases exponentially (D) Remain constant
Last Answer : (B) Increases linearly
Description : The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated. (A) Decreases (B) Increases (C) Remain constant (D) May increase or decrease; depends on the chemical characteristics of polluted water
Last Answer : (A) Decreases
Description : When a catalyst increases the rate of forward reaction, the value of rate constant (A) Increases (B) Decreases (C) Remain same (D) Becomes infinite
Description : With increase in initial concentration, the fractional conversion of a first order reaction in a given time (A) Increases (B) Decreases (C) Remain constant (D) Unpredictable
Description : When a catalyst increases the rate of chemical reaction, the rate constant (A) Decreases (B) Increases (C) Remain constant (D) Become infinite
Description : The equilibrium constant of a catalytic chemical reaction __________ due to the presence of a catalyst. (A) Increases (B) Decreases (C) Remain unaffected (D) Unpredictable from the data
Last Answer : (C) Remain unaffected
Description : The equilibrium constant of chemical reaction __________ in the presence of catalyst. (A) Increases (B) Decreases (C) Remain unaffected (D) Can either increase or decrease (depends on the type of catalyst)