Answer Posted / buddhadev dewasi (imps college
AC stands for alternate current, DC stands for direct
current. Alternate current alternates between positive and
negative and the number of times it does per minute is
called cycles. Depending on the number of poles in the
motor, the speed is constant. Where as in a DC drive, the
speed control is simple, by introducing a resistance.
| Is This Answer Correct ? | 5 Yes | 3 No |
Post New Answer View All Answers
What happens if we give the supply to the rotor of induction motor and make its terminal shorted?
If I have 3 essential main switch board and 3 incoming electricity ,but only 1 genset running is that possible.
if voltage bt phase & nutral is 38v in a panel board . whats the root cause.
What is the difference between single point and double point bonding. please kindly detail about bonding of cables.
please give me solution to rectify the emi(electromagnetic interference)
What do you mean by a current transformer?
full form of electrical?
Is better to supply the voltage for static exciter from the auxiliary power source or from the SG terminals? And why?
How to calibrate or test an LT Air Circuit breaker 440 volts, 35 KA, 800 Amps ?
What are marginally stable systems?
I am going to appear for the RRB Chennai junior Engineer online exam. Please send me the previous exams question papers (also solved) to my mail id: rrkhandhar@yahoo.com
When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<
what is mean by ideal infinite bus? why it is required to consider in fault short circuit calculations?
what is the difference between b c d curves on mcb
1.what is difference between ATS & STS main use. 2.what is difference between ACB& VCB With symobles,and main partes, manimum range. 3.How many types of relays and main function.
