Inverters – 1 – 1

1. A single-phase full bridge inverter can operate in load-commutation mode in case load consists of :

(a) RL
(b) RLC underdamped
(c) RLC overdamped
(d) RLC critically damped

ANSWER

EXPLANATION

2. In single-pulse modulation of PWM inverter, the pulse width is 120 degree. For an input voltage of 220v dc, the rms value of output voltage is :

(a) 179.63 V
(b) 254.04 V
(c) 127.02 V
(d) 185.04 V

ANSWER

EXPLANATION

3. A time-margin for series inverter ensures :

(a) low poer loss
(b) safety of the device
(c) improved power factor
(d) absence of harmonics

ANSWER

EXPLANATION

4. Output voltage of a single-phase bridge inverter, fed from a fixed dc fixed dc source, is varied by :

(a) varying the switching frequency
(b) pulse-width modulation
(c) pulse amplitude modulation
(d) all of the above

ANSWER

EXPLANATION

5. In a series resonant inverter :

(a) the load current has square waveform
(b) trigger frequency is higher than damped resonant frequency
(c) change of frequency does not alter transferred power
(d) output voltage depends upon damping factor of the load

ANSWER

EXPLANATION

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