# The linear operation L(x) is defined by the cross product L(x) = bxx, where b = [0 1 0]T and x = [x1 x2 x3]T are three dimensional vectors. The 3 x 3 matrix M of this operation satisfies L(x) = M   Then the eigenvalues of M are

1.  0, + 1, -1

2.  1, -1, 1

3.  i, -i, 1

4.  i, -i, 0

4

i, -i, 1

Explanation :
No Explanation available for this question

# In the figure, transformer T1 has two secondaries, all three windings having the same number of turns and with polarities as indicated. One secondary is shorted by a 10 resistor R, and the other by a 15 µF capacitor. The switch SW is opened (t = 0) when the capacitor is charged to 5 V with the left plate as positive. At t = 0+ the voltage Vp and current IR are

1.  - 25 V, 0.0 A very large voltage, very large current 5.0 V, 0.5 A - 5.0 V, - 0.5 A

2.  very large voltage, very large current

3.  5.0 V, 0.5 A

4.  - 5.0 V, - 0.5 A

4

- 5.0 V, - 0.5 A

Explanation :
No Explanation available for this question

# IC 555 in the adjacent figure is configured as an astable multivibrator. It is enabled to oscillate at t = 0 by applying a high input to pin 4. The pin description is : 1 and 8 - supply ; 2 - trigger; 4 - reset; 6 - threshold; 7- discharge. The waveform appearing across the capacitor starting from t  = 0, as observed on a storage CRO is

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# In the circuit of adjacent figure the diode connects the ac source to a pure inductance L.  The diode conducts for

1.  90°

2.  180°

3.  270°

4.  360°

4

270°

Explanation :
No Explanation available for this question

# The circuit in the figure is a current commutated dc - dc chopper where, ThM is the main SCR and ThAUX is the auxiliary SCR. The load current is constant at 10 A. ThM is ON. ThAUX is triggered at t = 0. ThM is turned OFF between

1.  0 µs < t ≤ 25 µs

2.  25 µs < t ≤ 50 µs

3.  50 µs < t ≤ 75 µs

4.  75 µs < t ≤ 100 µs

4

25 µs < t ≤ 50 µs

Explanation :
No Explanation available for this question

# In the circuit shown in figure switch SW1 is initially CLOSED and SW2 is OPEN. The inductor L carries a current of 10 A and the capacitor is charged to 10 V with polarities as indicated. SW2 is initially CLOSED at t = 0 - and SW1 is OPENED at t = 0. The current through C and the voltage across L at t = 0 + is

1.  55 A, 4.5 V

2.  5.5 A, 45 V

3.  45 A, 5.5 V

4.  4.5 A, 5.5 V

4

4.5 A, 5.5 V

Explanation :
No Explanation available for this question

# The R-L-C series circuit shown is supplied from a variable frequency voltage source. The admittance-locus of the R-L-C network at terminals AB for increasing frequency ω is

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# In the figure given below all phasors are with reference to the potential at point "O". The locus of voltage phasor VYX as R is varied from zero to infinity is shown by

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# A 3 V dc supply with an internal resistance of 2 supplies a passive non-linear resistance characterized by the relation VNL= I2NL. The power dissipated in the non-linear resistance is

1.  1.0 W

2.  1.5 W

3.  2.5 W

4.  3.0 W

4

1.0 W

Explanation :
No Explanation available for this question

1.  1

2.  0.25

3.  0.1

4.  0

4