GURU TECHNICAL CLASSES
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Important Diploma Electrical Questions
Q: what happen if we give 220 volts dc supply to d bulb and
tube light?
Answer: tubelight will not work because it's chalk will be burned because of not induction created in it but lamp will be worked cause filament is only need supply,eighter d.c or a.c.
Answer: tubelight will not work because it's chalk will be burned because of not induction created in it but lamp will be worked cause filament is only need supply,eighter d.c or a.c.
Q: What type of motor is used inside computer CPU.....??
Answer: stepper motor or servo motor in stabilizer....................
Answer: stepper motor or servo motor in stabilizer....................
Q: why we can't use more then 50 hz in india ? Is it
possible ? or why some contraries use 50Hz and some use 60Hz supply..???
Answer: 50 Hz frequency is the britis system and every component is manufacturing since that time it self to work by this frequency. 60Hz Frequency is american system....
We know that Ns=120f/P or f=Ns*P/120, P=2,4,6,8 etc. & Ns we can adjust by adjusting the speed of Engine which coupled with alternator so that f comes to 60 or other
frequency.Hence it is possible to generate the frequeny other than 50 Hz.
Now if f = 60 or others, then loss will be vary accordingly, insulation / dielectric loss,dimension of the
all equipment, all machines which is using for manufacture of electrical component has to change. In other words all the existing M/Cs has to modified from root it self , which is not possible for a single day. Hence excisting m/cs are using at 50Hz........
Answer: 50 Hz frequency is the britis system and every component is manufacturing since that time it self to work by this frequency. 60Hz Frequency is american system....
We know that Ns=120f/P or f=Ns*P/120, P=2,4,6,8 etc. & Ns we can adjust by adjusting the speed of Engine which coupled with alternator so that f comes to 60 or other
frequency.Hence it is possible to generate the frequeny other than 50 Hz.
Now if f = 60 or others, then loss will be vary accordingly, insulation / dielectric loss,dimension of the
all equipment, all machines which is using for manufacture of electrical component has to change. In other words all the existing M/Cs has to modified from root it self , which is not possible for a single day. Hence excisting m/cs are using at 50Hz........
Q: Why the capacitor are connected in Delta(Three Phase) for
power factor improvement ?
Answer: The effective capacitance more in delta as compared with star connection provided that same capacitors are used....
Answer: The effective capacitance more in delta as compared with star connection provided that same capacitors are used....
Q: what is the CT of protection and CT of metering ?
Answer: there are two type of ct.
one is metering CT another one is Protection CT
the metering ct has very less error, so we can measure current and actual power by accuratly,
the protecton ct has more error but that has more saturaion level, so during fault condition this ct will not saturate. but Metering ct will saturate when fault condition and that time we can't measure the current value.
Answer: there are two type of ct.
one is metering CT another one is Protection CT
the metering ct has very less error, so we can measure current and actual power by accuratly,
the protecton ct has more error but that has more saturaion level, so during fault condition this ct will not saturate. but Metering ct will saturate when fault condition and that time we can't measure the current value.
Q: what phase and neutral..???
Answer: In AC power system(single/three phase) in which the current flow is known as phase and the return path is neutral. In three phase star system the common point where the three phase are joined together is known as neutral.When there is any unbalance occurs there is a flow of current in neutral also(which is connected to earth). ....
Answer: In AC power system(single/three phase) in which the current flow is known as phase and the return path is neutral. In three phase star system the common point where the three phase are joined together is known as neutral.When there is any unbalance occurs there is a flow of current in neutral also(which is connected to earth). ....
Q: why neutral is required in electrical system..?
Answer: The neutral works as a return path for the current flowing through any equipment.In single phase system it is necessary to close the circuit through neutral wire... and also used for unbalanced 3 phase supply...................
Answer: The neutral works as a return path for the current flowing through any equipment.In single phase system it is necessary to close the circuit through neutral wire... and also used for unbalanced 3 phase supply...................
Q: what is effect of temperature rise on sag ans tension of conductor wire..?
Answer: sag is proportional to temp and tension is inversely proportional to temp............ if temp rise than sag increase but tension decrease...........
Answer: sag is proportional to temp and tension is inversely proportional to temp............ if temp rise than sag increase but tension decrease...........
Q: why we are using the ac supply in domestic purpose, why don't use dc supply.??
Answer: In india the geration and transmission voltage is AC..
1.DC generation also available but we could not going to generate as much as our require because it has somelimitation for commutator & Brush in DC generator and also transmission of DC supply is so complicated in
compared with AC.
2. dc supply is more dangerous compare to ac because dc frequency is zero.
3. dc is transmitted in a same voltage but in ac supply voltage is step up or step down "which we want to use" with the help of transformer.. for decease current.
Answer: In india the geration and transmission voltage is AC..
1.DC generation also available but we could not going to generate as much as our require because it has somelimitation for commutator & Brush in DC generator and also transmission of DC supply is so complicated in
compared with AC.
2. dc supply is more dangerous compare to ac because dc frequency is zero.
3. dc is transmitted in a same voltage but in ac supply voltage is step up or step down "which we want to use" with the help of transformer.. for decease current.
Q: Whether the LIGHTNING is AC or DC???
Answer: Its neither dc nor ac.. its just a high magnitude pulse... more powerful pulse..
Answer: Its neither dc nor ac.. its just a high magnitude pulse... more powerful pulse..
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