Time Left - 15:00 mins

GATE 2020 || Electrical Machines || Quiz 1 (App update required to attempt this test)

Attempt now to get your rank among 1130 students!

Question 1

Which losses are basically due to reversal of magnetization of the armature core?

Question 2

In Fleming right-hand thumb rule, thumb represents?

Question 3

Calculate the magneto motive force (MMF) i.e. the number of ampere turns required to produce a flux of 0.5 mWb in an air gap of iron ring of 5 cm2 cross section and 0.3 m mean diameter having an air gap of 1 mm cut across it. Assume the relative permeability of iron to be 1000 and leakage factor 1.2

Question 4

A transformer with tororidal core of permeability μ is shown in the figure. Assuming uniform flux density across the circular core cross-section of radius r<<R, and neglecting any leakage flux, the best estimate for the mean radius R is

Question 5

The emf induced in a conductor of machine driven at 600 rpm, the peak value of flux density is 1 Wb/m2, diameter of machine 2 m and length of machine 0.3 m is ______ V.

Question 6

_______will be the ampere turns per pole of field excitation required for the single gap of a 2 pole generator with the following particulars; 200 V on no-load at 2000 rpm; armature length is 32 cm and effective gap length is 0.8 cm; pole arc 30 cm and 200 armature conductors.
  • 1130 attempts
  • 4 upvotes
  • 2 comments
Dec 13ESE & GATE EE