1
GATE EE 2009
MCQ (Single Correct Answer)
+2
-0.6
A field excitation of $$20A$$ in a certain alternator results in a armature current of $$400$$ $$A$$ in short circuit and a terminal voltage of $$2000$$ $$V$$ on open circuit. The magnitude of the internal voltage drop with in the machine at a load current of $$200$$ $$A.$$
A
$$1$$ $$V$$
B
$$10$$ $$V$$
C
$$100$$ $$V$$
D
$$1000$$ $$V$$
2
GATE EE 2009
MCQ (Single Correct Answer)
+2
-0.6
Figure shows the extended view of a $$2$$ pole $$dc$$ machine with $$10$$ armature conductors. Normal brush positions are shown by $$A$$ and $$B,$$ placed at the inter polar axis. If the brushes are now shifted, in the direction of rotation to $$A'$$ and $$B'$$ as shown, the voltage waveform $${V_{A'B'}}$$ will resemble GATE EE 2009 Electrical Machines - D.C Machines Question 4 English
A
GATE EE 2009 Electrical Machines - D.C Machines Question 4 English Option 1
B
GATE EE 2009 Electrical Machines - D.C Machines Question 4 English Option 2
C
GATE EE 2009 Electrical Machines - D.C Machines Question 4 English Option 3
D
GATE EE 2009 Electrical Machines - D.C Machines Question 4 English Option 4
3
GATE EE 2009
MCQ (Single Correct Answer)
+1
-0.3
The single phase, $$50$$ $$Hz$$ iron core transformer in the circuit has both the vertical arms of cross sectional area $$20\,\,c{m^2}$$ and both the horizontal arms of cross sectional area $$10\,\,c{m^2}$$. If the two windings shown were wound instead on opposite horizontal arms, the mutual inductances will GATE EE 2009 Electrical Machines - Transformers Question 28 English
A
double
B
remain same
C
be halved
D
become one quarter
4
GATE EE 2009
MCQ (Single Correct Answer)
+2
-0.6
GATE EE 2009 Electrical Machines - Transformers Question 20 English

The figure above shows coil $$1$$ and $$2,$$ with dot markings as shown, having $$4000$$ and $$6000$$ turns respectively. Both the coils have a rated current of $$25$$ $$A.$$ Coil $$1$$ is excited with single phase, $$400$$ $$V,$$ $$50$$ $$Hz$$ supply.

The coils are to be connected to obtain a single-phase, $${{400} \over {1000}}\,\,V,$$ auto-transformer to drive a load of $$10$$ $$kVA.$$ Which of the options given should be exercised to realize the required auto-transformer?

A
Connect $$A$$ and $$D;$$ Common $$B$$
B
Connect $$B$$ and $$D;$$ Common $$C$$
C
Connect $$A$$ and $$C;$$ Common $$B$$
D
Connect $$A$$ and $$C;$$ Common $$D$$
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