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q. define coil pitch back pitch front pitch pole pitch commutator pitch resultant pitch multiplex winding and degree of re-entrant of a winding
armature reaction in dc generator armature reaction is the effect of magnetic flux set up by armature current upon the distribution of flux under
q. write a short note on types of enclosure of machine.sol. the various types of d.c. machine
q. what do you understand by demagnetizing and cross magnetizing effects of armature reaction in a d.c. machine. derive the expression for
q. explain the working principle of a d.c. generator. explain clearly the function of commutator in d.c. machines.sol. working principle of a d.c.
q. series generator having a combined armature and field resistance of 0.4? is running at 1000 r.p.m. and delivering 5.5kw at terminal voltage of 110
q. a shunt generator gives full load output of 30 kw at a terminal voltage of 200v. the armature and field resistance are 0.05? and 50? resp.. the
q. what are the different types of dc generation according to the ways in which fields are excited. show the connection diagram of each type.ans.
q. an 8 - pole dc generator has 500 armature conductors and has a useful flux per pole of 0.065 web. what will be the emf generated if it is lap
q. derive the expression for generated emf in a dc generator.ans.expression for generated emf in a dc
q. in a 110v compound generator the armature shunt and series winding resistance are 0.06? 25? and 0.04? respectively. the load consists of 200
dummy coils these coils are used with wave winding and resorted to when the requirement of the winding are not met by the standard armature punching
q. list and explain the factors involved in the voltage build up of shunt generator.ans.following factors are involved in voltage build up of
q. a 6 - pole dc armature with 36 slots and 2 coil - slidesslot is to be wave wound double layer. calculate the back pitch front - pitch and
q. define and explain the critical field circuit resistance and critical speed of a dc shunt generator. ans. the occ and r - line for a dc
with a simple circuitexplain the construction of direct reading probe of a cathode ray
q. enumerate different types of errors in measurement. how can these errors be minimized. sol. types of
q. with suitable example differentiate between accuracy and precision. sol. accuracy accuracy is the closeness with which instrument reading
q. with suitable examples differentiate between limiting and known errors.sol. limiting errors guarantee errors the accuracy and precision of an
reproducibility and repeatability are measures of closeness with which a given input may be measured over again. the two terms cause confusion.
if the instruments has no drift it is perfectly reproducible. no drift means that with a given input the measured values do not vary with time.drift
for large number of measurements the mean is calculated by taking a sample. each sample that is taken has a mean. the mean of various sample
q. explain the different types of probes used in cathode ray oscilloscope cro.sol. probes the probe performs the very important function of
q. write short note on storage oscilloscopes.sol. storage oscilloscope the bistable storage tube is between two to ten times slower than a
consider the characteristics of patterns that appear on the screen of a crt when sinusoidal voltages are simultaneously applied to horizontal and