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Company >> Fiat >> Fiat Questions
 Fiat interview questions  Fiat Interview Questions (4)
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Question   entry of salary after deducting esi and pf Rank Answer Posted By  
 Interview Question Submitted By :: Jeetaman
I also faced this Question!!   ALL Interview .com
Salary a/c........Dr.         5000
To esi ....                             45
To pf ...                               155
To salary payeble.             4800
0 Simar
salary                             5000
to esi..                                       45
to pf                                          155
to salary payeble                              4800
0 Shelendra Pratap Singh
[Kailash Associates]
Question   1hp=how much rpm Rank Answer Posted By  
 Interview Question Submitted By :: Bulbulekunal
I also faced this Question!!   ALL Interview .com
0 Madhu
Data is missing in the question 
according to formula p

P=2x3.14NT/60 we have to at least torque & power to
calculate speed
0 Gajanan Kuhite
Question   Why Power generation in India is at 50Hz while in America its 60Hz so is there any advantage/Disadvantage of this ?? Rank Answer Posted By  
 Interview Question Submitted By :: Crmeena
I also faced this Question!!   ALL Interview .com
machine are rating 4 this frequency
1 Chandan
it used accordingly to the standerd of the power generation.
0 Subrat Kumar Das
[NTPC Ltd.]
in US the frequency is 60hz and 110v supply. but in india 
is about 240v,50hz supply. for a particular load say 100kw 
the current will be 0.416A. but in US the same load will 
consume about 0.9A. here the thing is the heat produced in 
the cable bcoz of the flow of current will be large in US 
compare to india. since US is a cold country they can use 
this level but not by india.
2 Mullu
[NTPC Ltd.]
i m not agree with MULLU. coz if this the only reason then 
the distribution cost will increase due to bigger conductor 
size & insulation
0 Parminder
[NTPC Ltd.]
For the same supply ,IN US  FREQUENCY IS 60 HZ,DUE TO THAT 
all the  EQUIPMENTs ARE RUNNING WITH (60-50)/50*100 i.e 20%
higher SPEED as compared to if N would be higher
(w=2pief),generated emf wld be more;

i.e for the same supply ,but for different frequency ;the 
generated e.m.f wld be more.
0 Deepak Kumar
[NTPC Ltd.]
During the development of commercial electric power systems 
in the late 19th and early 20th centuries, many different 
frequencies (and voltages) had been used. Large investment 
in equipment at one frequency made standardization a slow 
process. However, as of the turn of the 21st century, 
places that now use the 50 Hz frequency tend to use 220-240 
V, and those that now use 60 Hz tend to use 100-120 V. Both 
frequencies co-exist today (some countries such as Japan 
use both) with no technical reason to prefer one over the 
other and no apparent desire for complete world-wide 

Unless specified by the manufacturer to operate on both 50 
and 60 Hz, appliances may not operate efficiently or even 
safely if used on anything other than the intended 
0 Sarfraz
[NTPC Ltd.]
In my point of view,it may be due to the construction and 
speed of the generator.We know that "f=NP/120".According to 
this equation frequency is directly propotional to the 
product of speed and the number of poles.For example,
speed,N=1500rpm and number of poles,P=4,then the 
frequency,f=50Hz.If the speed,N=1800rpm,then the 
0 Vineeth
[NTPC Ltd.]
i can easily understand mr Vineeth answer, thanking for 
0 Gtmanikandan
[NTPC Ltd.]
I Think in Us they are using Pure Power coz they have 
surplus amount of electricity n tht's why for gaining pure 
power they use 60Hz frequency.
0 Rohit Chourey
[NTPC Ltd.]
i dont agree with any one
0 Udy
[NTPC Ltd.]
what is the difference between pure and impure power "ROHIT"
0 Shahulsnfa
[NTPC Ltd.]
what may be the country ,if we increase the frequency load
requirement is less for example if we normally use 50Hz 220v
supply .now frequency is  dropped to 49HZ then load
requirement is higher than increase the frequency is
the way to tame the load requirement(refer cl.wadwha)
0 Prabveen Patel
[NTPC Ltd.]
0 Vijay
[NTPC Ltd.]
We all know that as the frequency is increased the conductor
size must be increased, In  INDIA (being a economically
backward country when compared to US) found operating at
50hz is more economical than that of the 60Hz.and coming to
US it has a very high quality of power because the
investment for the power is also high which it can afford.

So my friends it is only for the Economical reason why India
is using 50Hz and Us with 60Hz frequency,and not any other
reason.So only all the equipment in India designed to work
at 50Hz to make the equipment economical for a common man.

Thank u
0 Thuranga
[NTPC Ltd.]
If frequency is high then losses are more 
as we know that hysterysis loss 
ph=k*B^1.6*f and eddy current loss
the transformers produced in India can be used there too
but transformers designd there cannot be used here
0 Akhil
[NTPC Ltd.]
Well what i feel is that their is no particular reason for 
US using 60 hz and we going for 50 hz. But the ratio V/f is 
what really matters i.e. any m/c made to operate at a 
particular v/f ratio will either be under rated or under 
utilized if the ratio goes less and vice versa. With 
increased freq., freq losses also increases and so eff. 
goes low and o/p is reduced.
0 Gautam Himmatramka
[NTPC Ltd.]
well, for the safety reason of the consumer in the US, they 
decided to kept voltage level at 110V a.c. at the consumer 
end. but to avoid distribution loss and over heating of the 
conductors they kept frequency of AC supply at 60 Hz. to 
reduce that losses.
0 Vishvesh
[NTPC Ltd.]
in britain they used 50 hz supply so they installed plants
in india on their own standard,but americans followed to use
60 hz.there is no practical difference between these two
rated frequencies.
0 Don
[NTPC Ltd.]
0 Tripple X
[NTPC Ltd.]
Mr 'Tripple X'. if u know the answer then u post it.It was
my opinion I have told to that question.if u have that much
of guts then u also post some unique answer.


u tell me where do u not find the backwardness in our
country......if u roam in atleast in one lane of India, u
will find many food less people...if u think that India is
such a forward country then there must not be any such kind
of hungry deaths or unemployment deaths. If India is such a
forward country then each and every person must be having
food 3times a day......
if u have that much guts bring back the money in swiss bank
accounts and give it to that they may live
happily from now onwards atleast....

aap ki desh prem ko main salaam kartha hoon lekin sachhayi
toh yahi hain naa.....shayad aap ki city main aur town main
aisa nahi ho lekin 70-80 % bharat log ko khana nahi mil raha

insaan ko ek baar main samaj mein aajaataah hai......main
expect kar raha hon ki aap ko samaj main aa gaya......

thank u....for giving me a chance to speak the burden in my
heart......and gud byee.....
0 Thuranga
[NTPC Ltd.]
hey guys I found another answer for it......

if we consider the temperature parameters of the
America....then it is almost cool all through the
year,excepting 2 to 3 months maximum.

we all know that in conductors, heating the conductors will
lower its resistance,similarly,cooling also increases the
so for preventing the losses, the driving current must be
high, but to maintain the power constant the voltage is
reduced to 110V. So to make the current high,frequency will
be high,and they found that losses were low on operation of
equipment at 60Hz than at 50Hz.

but when u take tropical places almost the whole operation
is with 50Hz.

but here arises another question that,equator passes through
America also,but even then they use 60Hz for their operation.?
My answer is, there will be no different power generations
with different ratings of voltage and frequencies,as all the
states are interconnected just similar to other countries to
meet the demand of power.
so for small number of states the whole country is not going
to change the operation of frequency.
0 Thuranga
[NTPC Ltd.]
The reasons for power supply frequency in India to be 50 Hz 
and in US to be 60 HZ are:
1.ENVIRONMENTAL FACTORS :::::The average annual temperature 
of India is greater than US
2.POWER GENERATION REASONS     :To generate power of that 
frequency it costs alot and the size of the alternator is 
huge and it costs an incredible amount which we cant afford
3.EDDY CURRENT LOSSES  :As frequency increases eddy current 
and hysteriss losses increasesand hence power loss also 
0 Hitesh Pulluru
[NTPC Ltd.]
i think there is no technical reason behind the generation 
of power at 50Hz in India and 60Hz in America. It is just 
the standardization of country. America firstly designad 
their equipments at 60Hz and after that India and other 
countries designad their equipments at 50Hz.
0 Dheeraj
[NTPC Ltd.]
Early in the history or electricity, Thomas Edison's 
General Electric 
company was distributing DC electricity at 110 volts in the 
United States. 
Then Nikola Tesla the devised a system of three-phase AC 
electricity at 
240 volts. Three-phase meant that three alternating 
currents slightly out 
of phase were combined in order to even out the great 
variations in 
voltage occurring in AC electricity. He had calculated that 
60 cycles per 
second or 60Hz was the most effective frequency. Tesla 
later compromised 
to reduce the voltage to 110 volts for safety reasons. 
Europe goes to 50Hz: 
With the backing of the Westinghouse Company, Tesla's AC 
system became the 
standard in the United States. Meanwhile, the German 
company AEG started 
generating electricity and became a virtual monopoly in 
Europe. They 
decided to use 50Hz instead of 60Hz to better fit their 
metric standards, 
but they kept the voltage at 110V. 
50Hz AC has greater losses and is not as efficient as 60HZ. 
Due to the slower speed 50Hz electrical generators are 20% 
less effective 
than 60Hz generators. Electrical transmission at 50Hz is 
about 10-15% less 
efficient. 50Hz transformers require larger windings and 
50Hz electric 
motors are less efficient than those meant to run at 60Hz. 
They are more 
costly to make to handle the electrical losses and the 
extra heat 
generated at the lower frequency. 
Europe goes to 220V 
Europe stayed at 110V AC until the 1950s, just after World 
War II. They 
then switched over to 220V for better efficiency in 
transmission. Great Britain not only switched to 220V, but 
they also 
changed from 60Hz to 50Hz to follow the European lead. 
Since many people 
did not yet have electrical appliances in Europe after the 
war, the 
change-over was not that expensive for them. 
U.S. stays at 110V, 60Hz 
The United States also considered converting to 220V for 
home use but felt 
it would be too costly, due to all the 110V electrical 
appliances people 
had. A compromise was made in the U.S. in that 220V would 
come into the 
house where it would be split to 110V to power most 
appliances. Certain 
household appliances such as the electric stove and 
electric clothes dryer 
would be powered at 220V. 
My opinion on this is that even though high frequency can 
save your cost in  manufacture, but it also cause 
significant loss in power transmission  
especially for large scale power systems. So we need trade-
In the debate 50 - 60 Hz, Prof Trevor Blackburn treated the 
subject very well in the case of 
transformers, cf below reference, appendix I.2. There are 
several loss components that actually 
increase with higher frequency (some even increase 
proportional to the square of the frequency), 
such as hysteresis loss, eddy current loss, losses caused 
by harmonics and skin effect. 
Higher frequencies would limit the size of transmission 
lines and power 
transmitted on high voltage transmission systems. 

@Thuranga: Indian economy will surpass the US economy by 
0 Mohit Yadav
[NTPC Ltd.]
in US the frequency is 60hz and 110v supply. but in india 
is about 240v,50hz supply. for a particular load say 100kw 
the current will be 0.416A. but in US the same load will 
consume about 0.9A. here the thing is the heat produced in 
the cable bcoz of the flow of current will be large in US 
compare to india. since US is a cold country they can use 
this level but not by india.
0 Hitesh
[NTPC Ltd.]
according to the the formula n=120f/p, we can only obtain 
the frequency of 60 hz,if the number of pole is 2.5 so usa 
is able to developed 2.5 pole machine but india  cannot.SO 
don't think why power generation in india is at 50 hz while 
in america its 60 hz.THINK THIS THAT WHO TO MAKE 2.5 POLE 
0 Mahesh Kumar Yadav
[NTPC Ltd.]
we all know that the power generation in India is at 220v at frequency 50hz but in America it is 110v at frequency 60hz,the main reason behind this is that the impedance of inductor increases with frequency and that of capacitor decreases.if we find over all impedance of the combination of inductor,capacitor and resister we can see that the current supply would increase with a little decrease of frequency.the formula for current calculation is given as..
i= v/(r^2+(wL-1/wC)^2).
0 Shah Alam
[NTPC Ltd.]
i think 
 it is just 
the standardization of country.
0 Ankit Kaushal
[NTPC Ltd.]
Though it may be 60 or 50hzs, it never matter>>>>>enjoy the
power u get.........
0 Raaju
[NTPC Ltd.]
m nt satisfied with the answers pls give some right answers..
0 Mullu
[NTPC Ltd.]
its an hypothetical question ...........
0 Harish Repalle
[NTPC Ltd.]
for the frequency less than 50 hz electrical lamps will
appear to dark and glow .human eye cannot see the
fluctuation for frequency more than 50 hz, but if frequency
is increased more losses will increase and the voltage
applied can be reduced.In India 50 hz is used too prevent
losses but it is more danderous for human life.In USA 60 hz
is used because they can bear losses but not the loss in
human life.
0 Vivek Singh
[NTPC Ltd.]
i think dis is not an adv or disadv bz as Indian appliances are manufactured for 50 hz we use dat but US appliances are made for 60 hz it is not at all economical for us to change now to 60 hz and more over our gen is less compared to US
0 Meenakshi
[NTPC Ltd.]
its true that the power stations include a fixed speed of
rotor(3000 rpm) and fixed no. of poles as producing 50 hz
supply but i think it is fixed due to the conventional
electrical equipments which were using the same supply and
now a days equip.are designed on the basis of that...
0 Afzal Ansari
[NTPC Ltd.]
Transmission losses would be high if we use 60hz and it is of high cost when compared. A motor that is designed to run on 60 Hz and is plugged into a 50 Hz system will turn 17% slower, the internal current will go up 17%, the amount of power (watts) will go down 17%, and the mechanical cooling will be 17% less. The end result will be that the motor will be using a higher current then what the motor was designed for, and this in turn will burn up the insulation of the electrical wiring which can result in burnout which could cause a fire because of the excessive heat. The reason that 120v service was chosen, was economic. Originally electricity was delivered to homes, and most businesses, for a single purpose and that was lighting. Can openers, TVs, washers, dryers, electrical factory machinery, etc. came later. At the time the most cost effective form of light bulb was a carbon filament bulb that operated best (optimally) at 100v to 110v. This, adjusted for transmission voltage drop, set most supply lines at 120v.
0 Chadak Singh Rathode
[NTPC Ltd.]
In India the electrical system is come later as compared with U.S. USA is choose 60hz frequency for 110-120v. The losses are increased in any machine by increase the frequency. but the voltage is low as compared with India. then the voltage loss  occur in machine is low when compared to India.but the frequency losses are more . My conclusion is in India the machines are supported to 240v,50hz for cover the losses and in U.S is 120v,60hz respectively.
   advantages for USA supply
1: it is safe from shock hazards because the voltage is low 
2: suppose the supply is grounded less power is loss as compare with India
  the above two points are disadvantages for India
 suppose we use 60hz with 240v it is very dangerous and it cause more losses in machine.
0 Pratap Kumar
[NTPC Ltd.]
Question   how we can calculate the withholding tax for company? who will bear the tax? Rank Answer Posted By  
 Interview Question Submitted By :: Prafull Dhole
I also faced this Question!!   ALL Interview .com
it is the tax system which is followed by u.s the company 
will bear the tax
0 Ravi
The term With holding Tax has same meaning as that of TDS. 
in India, if a company pays  any fee, royality, commission 
or brokerage to a person who is not a resident, then the 
company shall deduct with holding tax according to rates 
prescribed by DTAA (Double taxation Avoidence Agreement) 
and shall remmit such tax to the government treasury
0 Mohd Abdul Qader
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