Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Solved Assignments
Asked Questions
Answered Questions
q. why are magnetic field system employed in practical electromechanical energy conversion devices rather than electric field systems?ans.in case
q. give the expression for inductance of a ?n? turn coil wound on a core having length i cross - sectional area a and magnetic
q. the area of the hysteresis loop of a given magnetic material is 50cm2 with the two axes scaled as 1cm 20at and 1cm 50mwb for 50hz frequency
leakage flux the flux that links the coil only partially passes through the core does not link the coil as the moving or rotating device is called
requisites of refractory material or essential requirements of good refractorya. it should be able to withstand high temperature.
thermal spelling the breaking or cracking or peeling off the refractory is known as spelling. a good refractory must show a good resistance to
refractoriness under load rul this represents the resistance of a refractory material to the combined efforts of heat and load. rul is the
refractoriness it indicates the capacity of a material to withstand heat without appreciable deformation or softening under particular operating
permeability the rate of diffusion of molten solid liquid and gases through refractories is called permeability. low permeability is usually more
bulk density this is represented by the weight per unit volume of the refractory of gcm3. this volume includes the volume of the pores space
properties of good refractory material the requirements of refractories for different furnaces and heating places depend on the working conditions.
spelling resistance the breaking or cracking or peeling off the refractory is known as spelling. a good refractory must show a good resistance to
heat capacity heat capacity of furnace depend on1 thermal conductivity 2 specific heat and 3 specific gravity of
porosity the property of the refractory brick is the ratio of its pore volume to the total volume. the refractory material with high porosity is not
q. how can you measure the refractories and refractoriness under load of a refractory material?
q. what are refractorys? how are they classified? give the essential requirements of good
types of engine the internal combustion engines for the automotive use may be classified according to the following considerationsengine cyclenumber
use of multicylinder engineif in a multi cylinder engine power strokes are staggered the limitation of flywheel can be overcome to a large extent.
basic engine design considerationseffect of engine sizethe two parameters involved are the diameter d and stroke l of the engine. the effect of
firing orderif in multi cylinder engines various cylinders are made to fire one after the other interference between adjacent cylinders would occur
comparison of petrol engines and diesel engines1. in petrol engine a mixture of air and petrol is drawn into the cylinder and
four stroke diesel enginethe cycle of events that takes place in a four -stroke diesel engine has been shown. unlike the petrol which drawn in a
comparison of 2-stroke and 4-stroke engines two-stroke engine possesses the following advantages over the four stroke type1.
working of i.c. enginebasically there are 2 types of internal combustion engines the two stoke type and the 4-stroke type. a brief description of
engine cyclesthe two commonly used cycles on which the i.c. engines operate are1otto cycle. 2 diesel cycle.1 otto