1
GATE EE 2009
MCQ (Single Correct Answer)
+1
-0.3
The two inputs of a $$CRO$$ are fed with two stationary periodic signals. In the $$X$$-$$Y$$ mode, the screen shows a figure which changes from ellipse to circle and back to ellipse with its major axis changing orientation slowly and repeatedly. The following inference can be made from this.
A
The signals are not sinusoidal.
B
The amplitudes of the signals are very close but not equal
C
The signals are sinusoidal with their frequencies very close but not equal
D
There is a constant but small phase difference between the signals
2
GATE EE 2009
MCQ (Single Correct Answer)
+2
-0.6
A $$200$$ $$V,$$ $$50$$ $$Hz,$$ single-phase induction motor has the following connection diagram and winding orientations shown. $$MM'$$ is the axis of the main stator winding $$\left( {{M_1}{M_2}} \right)$$ and $$AA'$$ is that of the auxiliary winding $$\left( {{A_1}{A_2}} \right).$$ Directions of the winding axis indicate direction of flux when currents in the windings are in the directions shown. Parameters of each winding are indicated. When switch $$S$$ is closed, the motor GATE EE 2009 Electrical Machines - Induction Machines Question 6 English
A
rotates clockwise
B
rotates anticlockwise
C
does not rotate
D
rotates momentarily and comes to a halt
3
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
$$1000$$ $$V$$
4
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
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