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739.

In a dc motor running at 2000 rpm, the hysteresis and eddy current losses are 500W and 200W respectively. If the flux remains constant, calculate the speed at which the total iron losses are halved.
[5 marks]

asked in Electrical Engineering, 2001

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740.

Consider the voltage waveform v, shown in Fig. Find.

(a) the dc component of v,
(b) the amplitude of the fundamental component of v, and
(c) the rms value of the ac part of v.
[5 marks]

asked in Electrical Engineering, 2001

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741.

An ideal transformer has a linear B/H characteristic with a finite slope and a turns ratio of 1:1. The primary of the transformer is energized with an ideal current source, producing the signal i as shown in Fig. Sketch the shape (neglecting the scale factor) of the following signals, labeling the time axis clearly:

(a) the core flux φ_oc with the secondary of the transformer open
(b) the open-circuited secondary terminal voltage v₂(t)
(c) the short-circuited secondary current i₂(t), and
(d) the core flux φ_sc with the secondary of the transformer short-circuited.
[5 marks]

asked in Electrical Engineering, 2001

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742.

Determine the resonance frequency and the Q-factor of the circuit shown in Fig. Data: R = 10Ω, C= 3µF, L₁ = 40 mH, L₂ = 10 mH and M = 10 mH

[5 marks]

asked in Electrical Engineering, 2001

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743.

A single-phase full-bridge voltage source inverter feeds a purely inductive load, a shown in Fig, where T₁, T₂, T₃, T₄ are power transistors and D₁, D₂, D₃, D₄ are feedback diodes. The inverter is operated in square-wave mode with a frequency of 50 Hz. If the average load current is zero, what is the time duration of conduction of each feedback diode in a cycle?

[2 marks]
(a) 5 msec
(b) 10 msec
(c) 20 msec
(d) 2.5 msec

asked in Electrical Engineering, 2001

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744.

A half-wave thyristor converter supplies a purely inductive load, as shown in Fig. If the triggering angle of the thyristor is 120°, the extinction angle will be

[2 marks]
(a) 240°
(b) 180°
(c) 200°
(d) 120°

asked in Electrical Engineering, 2001

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