A unity feedback control system has open-loop transfer function G(s) = K/[s(s+2)(s+4)]. For the system to be marginally stable, the value of K should be approximately:
Q.202Medium
In a lead compensator design, if the phase lead angle required is 45°, the value of α (attenuation factor) in the compensator Gc(s) = (1+αTs)/(1+Ts) should be:
Q.203Medium
Which of the following statements about state-space representation is INCORRECT?
Q.204Medium
A single-phase full-wave bridge rectifier with a 230V AC input produces an average output voltage of approximately:
Q.205Medium
Which of the following thyristors can be turned off by a gate signal?
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Q.206Medium
In a step-down DC-DC converter (buck converter), the output voltage is always:
Q.207Medium
The switching frequency of power electronic devices is increased to:
Q.208Medium
A 3-phase diode rectifier (6-pulse) produces a ripple frequency of:
Q.209Medium
The holding current of an SCR is important because:
Q.210Medium
A PWM (Pulse Width Modulation) controlled DC motor drive uses which power electronic device?
Q.211Medium
The commutation of a thyristor in a circuit means:
Q.212Medium
The reverse recovery time of a diode is critical in power electronics because it:
Q.213Medium
Which of the following devices can block voltage in both forward and reverse directions?
Q.214Medium
In a flyback converter, the energy transfer occurs during:
Q.215Medium
In a three-phase bridge inverter with 120° conduction mode, each switch conducts for:
Q.216Medium
In an induction motor fed by a variable frequency drive (VFD), the V/f ratio is maintained constant to:
Q.217Medium
The parasitic capacitance in a power MOSFET causes:
Q.218Medium
A series RLC filter connected at the output of an inverter serves to:
Q.219Medium
The snubber capacitor in a power converter acts to:
Q.220Medium
The phenomenon of commutation in a thyristor-based rectifier circuit refers to:
