CETA ACTUAL FINALS ANSWERS AND QUESTIONS
SET A+
✔✔If a signal decreases by 3 dB, how much power is lost?
A.
33%
B.
66%
C.
50%
D.
22.5% - ✔✔C.
50%
✔✔-3dBm is equal to how many milliwatts?
A.
1.5mW
B.
.5mW
C.
.4mW
D.
5mW - ✔✔B.
.5mW
✔✔The formula to calculate dBm from mW is:
A.
10 log10( P / 1mW)
B.
20 log10( P / 1mW)
C.
10 log10( P / .5mW)
D.
10 log10( P^mW) - ✔✔A.
, 10 log10( P / 1mW)
✔✔The split capacitors in a Colpitts oscillator provide:
A.
regenerative feedback.
B.
interelement capacitance.
C.
degenerative feedback.
D.
a phase shift in signal. - ✔✔A.
regenerative feedback.
✔✔Why are crystal oscillators preferred over other types of oscillators?
A.
When keeping frequency error or drift at a minimum is important
B.
Reduced amplitude through degenerative feedback is preferred
C.
Tolerance for frequency error or drift is not important
D.
When a resistive dampening effective is needed - ✔✔A.
When keeping frequency error or drift at a minimum is important
✔✔Why is a differentiator used at the input of a flip-flop?
A.
To produce a sharp spike
B.
To provide negative resistance
C.
To provide high input impedance
D.
To produce a rounded waveform - ✔✔A.
To produce a sharp spike
✔✔What is one way to minimize parasitic oscillations?
A.
Place a swamping resistor across the transformer
B.
Increase the resonant tank frequency
C.
Use a blocking oscillator
D.
Reduce the fundamental frequency of frequency-determining-device - ✔✔A.
Place a swamping resistor across the transformer
SET A+
✔✔If a signal decreases by 3 dB, how much power is lost?
A.
33%
B.
66%
C.
50%
D.
22.5% - ✔✔C.
50%
✔✔-3dBm is equal to how many milliwatts?
A.
1.5mW
B.
.5mW
C.
.4mW
D.
5mW - ✔✔B.
.5mW
✔✔The formula to calculate dBm from mW is:
A.
10 log10( P / 1mW)
B.
20 log10( P / 1mW)
C.
10 log10( P / .5mW)
D.
10 log10( P^mW) - ✔✔A.
, 10 log10( P / 1mW)
✔✔The split capacitors in a Colpitts oscillator provide:
A.
regenerative feedback.
B.
interelement capacitance.
C.
degenerative feedback.
D.
a phase shift in signal. - ✔✔A.
regenerative feedback.
✔✔Why are crystal oscillators preferred over other types of oscillators?
A.
When keeping frequency error or drift at a minimum is important
B.
Reduced amplitude through degenerative feedback is preferred
C.
Tolerance for frequency error or drift is not important
D.
When a resistive dampening effective is needed - ✔✔A.
When keeping frequency error or drift at a minimum is important
✔✔Why is a differentiator used at the input of a flip-flop?
A.
To produce a sharp spike
B.
To provide negative resistance
C.
To provide high input impedance
D.
To produce a rounded waveform - ✔✔A.
To produce a sharp spike
✔✔What is one way to minimize parasitic oscillations?
A.
Place a swamping resistor across the transformer
B.
Increase the resonant tank frequency
C.
Use a blocking oscillator
D.
Reduce the fundamental frequency of frequency-determining-device - ✔✔A.
Place a swamping resistor across the transformer
