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1
GATE EE 2021
MCQ (Single Correct Answer)
+2
-0.67

In a single phase transformer, the total iron loss is 2500 W at nominal voltage of 440 V and frequency 50 Hz . The total iron loss is 850 W at 220 V and 25 Hz . Then, at nominal voltage and frequency, the hysteresis loss and eddy current loss respectively are

A

1600 W and 900 W

B

900 W and 1600 W

C

250 W and 600 W

D

600 W and 250 W

2
GATE EE 2018
MCQ (Single Correct Answer)
+2
-0.6
A transformer with toroidal core of permeability $$\mu $$ is shown in the figure. Assuming uniform flux density across the circular core cross-section of radius r $$ \ll $$ R, and neglecting any leakage flux, the best estimate for the mean radius R is GATE EE 2018 Electrical Machines - Transformers Question 10 English
A
$${{\mu V{r^2}N_P^2\omega } \over I}$$
B
$${{\mu I{r^2}{N_P}{N_S}\omega } \over V}$$
C
$${{\mu V{r^2}N_P^2\omega } \over {2I}}$$
D
$${{\mu V{r^2}N_P^2\omega } \over {2V}}$$
3
GATE EE 2018
Numerical
+2
-0
A 3-phase 900 kVA, 3 kV / $$\sqrt 3 $$ kV (Δ/Y), 50 Hz transformer has primary (high voltage side) resistance per phase of 0.3 Ω and secondary (low voltage side) resistance per phase of 0.02 Ω. Iron loss of the transformer is 10 kW. The full load % efficiency of the transformer operated at unity power factor is _______ (up to 2 decimal places).
Your input ____
4
GATE EE 2017 Set 2
Numerical
+2
-0
If the primary line voltage rating is 3.3 kV (Y side) of a 25 kVA. $$Y-\triangle$$ transformer (the per phase turns ratio is 5:1), then the line current rating of the secondary side (in Ampere) is_______.
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