For an oscillator to properly start, the gain around the feedback loop must initially be_________?
(A) 1
(B) Greater than 1
(C) Less than 1
(D) Equal to attenuation of feedback circuit
In a certain three-branch parallel circuit, R1 has 12 mA through it, R2 has 15 mA through it, and R3 has 25 mA through it. After measuring a total of 27 mA, you can say that____________?
(A) R3 is open
(B) R1 is open
(C) R2 is open
(D) the circuit is operating properly
Five 100 Ω resistors are connected in parallel. If one resistor is removed, the total resistance is______________?
(A) 25 Ω
(B) 500 Ω
(C) 100 Ω
(D) 20 Ω
One condition for oscillation is_____________?
(A) A phase shift around the feedback loop of 180o
(B) A gain around the feedback loop of one-third
(C) A phase shift around the feedback loop of 0o
(D) A gain around the feedback loop of less than 1
The total resistance of a parallel circuit is 50 Ω. If the total current is 120 mA, the current through the 270 Ω that makes up part of the parallel circuit is approximately_______________?
(A) 22 mA
(B) 120 mA
(C) 220 mA
(D) 50 mA
The crystal oscillator frequency is very stable due to___________of the crystal?
(A) Rigidity
(B) Vibrations
(C) Low Q
(D) High Q
In an LC circuit, when the capacitor is maximum, the inductor energy is____________?
(A) Minimum
(B) Maximum
(C) Half-way between maximum and minimum
(D) None of the above
The output impedance of an emitter follower is______________?
(A) High
(B) Very high
(C) Almost zero
(D) Low
A Wien bridge oscillator uses___________feedback?
(A) Only positive
(B) Only negative
(C) Both positive and negative
(D) None of the above
Quartz crystal is most commonly used in crystal oscillators because:____________?
(A) It has superior electrical properties
(B) It is easily available
(C) It is quite inexpensive
(D) None of the above