There is a total of 800 mA of current into four parallel resistors. The currents through three of the resistors are 40 mA, 70 mA, and 200 mA. The current through the fourth resistor is______________?
(A) 490 mA
(B) 800 mA
(C) 310 mA
(D) 0 A
The signal generator generally used in the laboratories is___________oscillator?
(A) Wien-bridge
(B) Hartely
(C) Crystal
(D) Phase shift
If one of the resistors in a parallel circuit is removed, the total resistance_____________?
(A) decreases
(B) increases
(C) remains the same
(D) doubles
The following currents are measured in the same direction in a three-branch parallel circuit: 200 mA, 340 mA, and 700 mA. The value of the current into the junction of these branches is____________?
(A) 200 mA
(B) 540 mA
(C) 1.24 A
(D) 900 mA
In an LC oscillator, if the value of L is increased four times, the frequency of oscillations is __________?
(A) Increased 2 times
(B) Decreased 4 times
(C) Increased 4 times
(D) Decreased 2 times
Four resistors are connected in parallel. Fifteen mA flows through resistor R. If the second resistor is 2R, the third resistor 3R, and the fourth resistor 4R, the total current in the circuit is______________?
(A) 60 mA
(B) 15 mA
(C) 135 mA
(D) 31.25 mA
In a certain oscillator Av = 50. The attention of the feedback circuit must be___________?
(A) 1
(B) 01
(C) 10
(D) 02
____________is a fixed frequency oscillator?
(A) Phase-shift oscillator
(B) Hartely-oscillator
(C) Colpitt’s oscillator
(D) Crystal oscillator
An important limitation of a crystal oscillator is____________?
(A) Its low output
(B) Its high Q
(C) Less availability of quartz crystal
(D) Its high output
The value of negative feedback fraction is always _______________?
(A) Less than 1
(B) More than 1
(C) Equal to 1
(D) None of the above