1) Unipolar modulation is generally used in
a. AC - AC converters
b. AC - DC converters
c. DC - AC converters
d. DC - DC converters
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Answer
Explanation
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ANSWER: DC - DC converters
Explanation:
No explanation is available for this question!
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2) In bipolar modulation, the carrier is symmetric about zero with amplitude equal to Cm, the PWM output
a. Zero
b. Switches between - 1 / 2 and + 1 / 2
c. Switches between - 1 and + 1
d. Switches between 0 and + 1
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Answer
Explanation
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ANSWER: Switches between - 1 / 2 and + 1 / 2
Explanation:
No explanation is available for this question!
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3) Double fourier series analysis of PWM is
a. Two dimensional functions
b. Three dimensional functions
c. One dimensional functions
d. All of these
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Answer
Explanation
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ANSWER: Two dimensional functions
Explanation:
No explanation is available for this question!
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4) In variable frequency, PWM gain
a. Phase lead helps to increase the phase margin of the control loop
b. Phase lag helps to increase the phase margin of the control loop
c. Phase lead helps to decrease the phase margin of the control loop
d. Phase lag helps to decrease the phase margin of the control loop
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Answer
Explanation
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ANSWER: Phase lead helps to increase the phase margin of the control loop
Explanation:
No explanation is available for this question!
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5) In constant frequency PWM, at perturbation the amplitude of the sinusoidal component is a
a. Linear function
b. Non linear function
c. Constant function
d. None of these
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Answer
Explanation
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ANSWER: None of these
Explanation:
No explanation is available for this question!
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6) The transfer function of PWM is generally developed in
a. Time domain
b. Frequency domain
c. Either (a) or (b)
d. None of these
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Answer
Explanation
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ANSWER: Either (a) or (b)
Explanation:
No explanation is available for this question!
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7) Regulator sampling PWM is usually used in
a. High power inverters
b. Rectifiers
c. Low power inverters
d. Only (a) and (b)
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Answer
Explanation
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ANSWER: Only (a) and (b)
Explanation:
No explanation is available for this question!
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8) A combination of synchronized leading edge and trailing edge modulation has also been used to control a
a. Boost single - phase power factor converter
b. A buck dc - dc converter to reduce ripple in the intermediate dc bus capacitor
c. Both (a) and (b)
d. None f these
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Answer
Explanation
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ANSWER: Both (a) and (b)
Explanation:
No explanation is available for this question!
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9) Double edge modulation eliminates certain harmonics when the reference is a
a. Sine wave
b. Square wave
c. Triangular wave
d. Trapezoidal wave
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Answer
Explanation
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ANSWER: Sine wave
Explanation:
No explanation is available for this question!
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10) The carrier which are commonly used in constant - frequency PWM is
a. Sawtooth carrier
b. Inverted sawtooth carrier
c. Triangle carrier
d. All of these
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Answer
Explanation
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ANSWER: All of these
Explanation:
No explanation is available for this question!
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