Full Form of IE2

Let's start with: "What do you think it_{<homework question!>} is?"

(That means, tell us what you know about this_{<homework question!>}.)

http://lmgtfy.com/?q=what%27s+the+basic+difference+between+IE1%2C+IE2%2C+IE3+and+IE4

I just love it when you do that!

It must be mid-terms in the Middle East Here they come, again

No, it's the solar flares draining all the intelligence from that side of the planet.

I'm finding the same problem on a UK site I help run. Its got to the stage of checking IP addresses and chucking them out before the homework questions start.
You may find that a bit harsh but we have our own trainees and they come first.

That said, the guys on here have always helped when I've asked a question. Some of the questions have been on obscure subjects. (Since I retired I've become interested in the history of the electrical industry, hence the obscure questions.)

I think it is about IEC 600034-30: energy-efficiency classes for single-speed, three-phase, cage-induction motors with 2, 4 or 6 poles.

http://en.wikipedia.org/wiki/IEC_60034

I was trying to figure out the connection between Microsoft's browser and motors.

IEC 60034-30 specifies electrical efficiency classes for single-speed, three-phase, 50 Hz and 60 Hz, cage-induction motors that:

• have 2, 4, or 6 poles (3,000; 1,500; and 1,000 RPM at 50 Hz)
• have rated output between 0.75 and 375 kW
• have a rated voltage up to 1000 V
• are rated on the basis of either duty type S1 (continuous duty) or S3 (intermittent duty) with a rated cyclic duration factor of 80% or higher

The table below shows the IEC 60034-30 (2008) efficiency classes and comparable efficiency levels.

The standard also reserves an IE4 class (Super Premium Efficiency) for the future. The following motors are excluded from the new efficiency standard:

• Motors made solely for inverter operation
• Motors completely integrated into a machine (pump, fan, or compressor) that cannot be tested separately from the machine.

Graph is showing as example 50 Hz, 4-pole motors

Ref - http://en.wikipedia.org/wiki/Premium_efficiency

It would have saved you a lot of time typing, cutting and pasting if you would have just told then the correct is "C" on the test.

hmm...so you are the OP.