1
GATE EE 2003
+2
-0.6
Figure shows an ideal single-phase transformer. The primary and secondary coils are wound on the core as shown. Turns ratio $$\left(\frac{N_1}{N_2}\right)$$=2. The correct phasors of voltages $$E_1,\;E_2$$ currents $$I_1,\;I_2$$ and core flux $$\phi$$ are as shown in
A
B
C
D
2
GATE EE 2003
+2
-0.6
Figure shows a $$\triangle$$ - Y connected 3-phase distribution transformer used to step down the voltage from 11000 V to 415 V line-to line. It has two switches S1 and S2. Under normal conditions S1 is closed and S2 is open. Under certain special conditions S1 is open and S2 is closed. In such a case the magnitude of the voltage across the LV terminals a and c is
A
240 V
B
480 V
C
415 V
D
0 V
3
GATE EE 2003
+2
-0.6
Figure shows an ideal three-winding transformer. The three windings 1,2,3 of the transformer are wound on the same core as shown. The turn's ratio N1:N2:N3 is 4:2:1. A resistor of 10 Ω is connected across winding-2. A capacitor of reactance 2.5 Ω is connected across winding-3. Winding-1 is connected across a 400 V, ac supply. If the supply voltage phasor $$\overline V=400\angle0^\circ$$, the supply current phasor $${\overline I}_1$$ is given by
A
(-10 + j10) A
B
(-10 - j10) A
C
(10 + j10) A
D
(10 - j10) A
4
GATE EE 2003
+1
-0.3
Group I lists different applications and Group II lists the motors for these applications. Match the application with the most suitable motor and choose the right combination among the choices given there after:

Group I
P. Food mixer
Q. Cassette tape recorder
R. Domestic water pump
S. Escalator

Group II
1. Permanent magnet dc motor
2. Single phase induction motor
3. Universal motor
4. Three phase induction motor
5. DC series motor
6. Stepper motor

A
$$\begin{array}{l}P\;\;\;Q\;\;\;R\;\;\;S\\3\;\;\;\;6\;\;\;\;4\;\;\;\;5\\\end{array}$$
B
$$\begin{array}{l}P\;\;\;Q\;\;\;R\;\;\;S\\1\;\;\;\;3\;\;\;\;2\;\;\;\;4\\\end{array}$$
C
$$\begin{array}{l}P\;\;\;Q\;\;\;R\;\;\;S\\3\;\;\;\;1\;\;\;\;2\;\;\;\;4\\\end{array}$$
D
$$\begin{array}{l}P\;\;\;Q\;\;\;R\;\;\;S\\3\;\;\;\;2\;\;\;\;1\;\;\;\;4\\\end{array}$$
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