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1.

A separately excited dc motor is controlled by varying its armature voltage using a single phase full-converter bridge as shown in Fig. the field current is kept constant at the rated value. The motor has an armature resistance of 0.2Ω, and the motor voltage constant is 2.5 V/(rad/sec). The motor is driving a mechanical load having a constant torque of 140 Nm. The triggering angle of the converter is 60°. The armature current can be assumed to be continuous and ripple free.
(a) Calculate the motor armature current
(b) Evaluate the motor speed in rad/sec.
(c) Calculate the rms value of the fundamental component of the input current to the bridge.

[5 marks]

last reply by CpjJwWHV • 13 years ago • asked in Electrical Engineering, 2001

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2.

A voltage commutated thyristor chopper circuit is shown in Fig. The chopper is operated at 500 Hz with 50% duty ratio. The load takes a constant current of 20A.
(a) Evaluate the circuit turn off time for the main thyristor Th_i.
(b) Calculate the value of inductor L, if the peak current through the main thyristor Th_i is limited to 180% of the load current.
(c) Calculate the maximum instantaneous output voltage of the chopper.

[5 marks]

asked in Electrical Engineering, 2001

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3.

A simple active filter is shown in Fig. Assume ideal op-amp. Derive the transfer function v₀/v₁ of the circuit, and state the type of the filter (i.e., highpass, low-pass, band-pass, or band-reject). Determine the required values of R₁, R₂ and C in order for the filter to have a 3-dB frequency of 1 kHz, a highfrequency input resistance of 100 kΩ, and a high frequency gain magnitude of 10.

[5 marks]

asked in Electrical Engineering, 2001

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4.

The transistor in the amplifier circuit shown in Fig. is biased at I_C = 1mA. Use V_T = KT/q = 26 mV, β_o = 200, r_b = 0 and r_o →∞
(a) Determine the ac small signal midband voltage gain v₀/v_I of the circuit.
(b) Determine the required value of C_E for the circuit to have a lower cutoff frequency of 10 Hz.

[5 marks]

last reply by CpjJwWHV • 13 years ago • asked in Electrical Engineering, 2001

View Comments [1 Reply]
5.

For the op-amp circuit shown in Fig, determine the output voltage v₀. Assume that the op-amps are ideal.

[5 marks]

asked in Electrical Engineering, 2001

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6.

For the ring counter shown in Fig, find the steady state sequence if the initial state of the counters is 1110 (i.e., Q₃,Q₂,Q₁,Q₀=1110). Determine the MOD number of the counter.

[5 marks]

asked in Electrical Engineering, 2001

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