Fourier Theory MCQ’s

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This set of Avionics Multiple Choice Questions & Answers (MCQs) focuses on “Fourier Theory”.

1. What is the duty cycle of a square wave with equal duration positive and negative alterations?
a) 100%
b) 50%
c) 200%
d) 25%

2. What is the frequency of 7th harmonic of a 2KHz sine wave?
a) 14Khz
b) 9KHz
c) 5KHz
d) 2KHz

3. A sine wave whose frequency is some integer multiple of a fundamental sine wave is called?
a) Complex wave
b) Square wave
c) Harmonic
d) Digital pulses

4. An infinite number of odd harmonics are present in a sine wave.
a) True
b) False

5. Which instrument produces frequency domain information?
a) Oscilloscope
b) Spectrum analyzer
c) Frequency divider
d) Beam analyzer

6. A pulse train has a rise time of 6 ns. What is the minimum bandwidth to pass this pulse train faithfully?
a) 58.3MHz
b) 42.6MHz
c) 812MHz
d) 41.5MHz

7. What is the peak value of 5th harmonic if the square wave has a peak voltage of 3v and a frequency of 48Khz?
a) 0.74
b) 0.52
c) 0.76
d) 1.5

8. What is the band width required to pass a signal with t0=75×10-9 without excessive distortions?
a) 14MHz
b) 53.7MHz
c) 13.33MHz
d) 11.56MHz

9. A circuit has a bandwidth of 200 kHz. What is the fastest rise time this circuit will pass?
a) 1.5μs
b) 2.3μs
c) 1.2μs
d) 1.75μs

10. Fourier analysis helps us to determine how much bandwidth a particular signal occupies.
a) True
b) False

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