EV605/EE605

EV605/EE605

In 180° conduction mode, each controlled switch is gated ON for

1: In 180° conduction mode, each controlled switch is gated ON for

60°

120°

180°

360°

With respect to the negative DC rail, the possible pole-voltage levels (Vao) are:

2: With respect to the negative DC rail, the possible pole-voltage levels (Vao) are:

−Vdc/3 and +Vdc/3

−Vdc/2 and +Vdc/2

0 and Vdc

−Vdc and +Vdc

The common-mode voltage relative to the DC-link midpoint is

3: The common-mode voltage relative to the DC-link midpoint is

Vao + Vbo + Vco

(Vab + Vbc + Vca)/3

(Vao + Vbo + Vco)/3

(Vao - Vbo - Vco)/3

Which switching-state pair produces zero line voltages across all three phases

4: Which switching-state pair produces zero line voltages across all three phases

(100) and (011)

(000) and (111)

(111) and (001)

(101) and (000)

An equal common-mode voltage added to all three pole voltages, which statement is correct

5: An equal common-mode voltage added to all three pole voltages, which statement is correct

Increases all line voltages

Cancels when calculating line voltages

Decreases all line voltages

Reverses the phase sequence

In conventional three-phase six-step operation, the switching state changes every:

6: In conventional three-phase six-step operation, the switching state changes every:

30°

90°

60°

120°

In linear three-phase SPWM, if ma remains constant and Vdc increases by 20%, the fundamental output-voltage magnitude

7: In linear three-phase SPWM, if ma remains constant and Vdc increases by 20%, the fundamental output-voltage magnitude

Decreases by 20%

Remains unchanged

Increases by 20% %

Increases by 40

When the sinusoidal reference peak exceeds the carrier peak in conventional SPWM, the inverter enters:

8: When the sinusoidal reference peak exceeds the carrier peak in conventional SPWM, the inverter enters:

Under-modulation

Overmodulation

Zero-vector operation only

Regenerative operation only

In conventional unipolar SPWM, the two bridge-leg reference signals are:

9: In conventional unipolar SPWM, the two bridge-leg reference signals are:

In phase

Displaced by 180°

Displaced by 120°

Displaced by 90°

In ideal conventional unipolar SPWM, the dominant output switching-ripple components are generally centred around

10: In ideal conventional unipolar SPWM, the dominant output switching-ripple components are generally centred around

Half the carrier frequency

Twice the carrier frequency

At the carrier frequency

Three times the carrier frequency