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643.

A fully controlled natural commuted 3-phase bridge rectifier is operating with a firing angle α=30°. The peak to peak voltage ripple expressed as a ratio of the peak output dc voltage at the output of the converter bridge is
[1 mark]
(a) 0.5
(b) √3 /2
(c) 1- √3/2
(d) √3 - 1

asked in Electrical Engineering, 2003

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644.

The speed/torque regimes in a dc motor and the control methods suitable for the same are given respectively in Group II and Group I

Group I Group II

P. Field Control 1. Below base speed

Q. Armature Control 2. Above base speed

3. Above base torque

4. Below base torque

[1 mark]
(a) P – 1; Q - 3
(b) P – 2; Q - 1
(c) P – 2; Q - 3
(d) P – 1; Q - 4

asked in Electrical Engineering, 2003

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645.

Fig. shown a MOSFET with an integral body diode. It is employed as a power switching device in the ON and OFF states through appropriate control. The ON and OFF states of the switch are given on the V_DS-I_S plane by

[1 mark]

asked in Electrical Engineering, 2003

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646.

Fig. shows a thyristor with the standard terminations of anode (A), cathode (K), gate (G) and the different junctions named J1, J2 and J3. When the thyristor is turned on and conducting

[1 mark]
(a) J1 and J2 are forward biased and J3 is reverse biased
(b) J1 and J3 are forward biased and J2 is reverse biased
(c) J1 is forward biased and J2 and J3 are reverse biased
(d) J1, J2 and J3 are all forward biased

asked in Electrical Engineering, 2003

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647.

A reading of 120 is obtained when a standard inductor was connected in the circuit of a Q-meter and the variable capacitor is adjusted to a value of 300 pF. A lossless capacitor of unknown value C_x is then connected in parallel with the variable capacitor and the same reading was obtained when the variable capacitor is readjusted to a value of 200 pF. The value of C_x in pF is
[1 mark]
(a) 100
(b) 200
(c) 300
(d) 500

asked in Electrical Engineering, 2003

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648.

The effect of stray magnetic fields on the actuating torque of a portable instrument is maximum when the operating field of the instrument and the stray fields are [1 mark]
(a) perpendicular
(b) parallel
(c) inclined at 60°
(d) inclined at 30°

asked in Electrical Engineering, 2003

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