MCQ Hive - Changing Pathways to Wisdom

A Wien bridge oscillator uses___________feedback?

A. Only positive
B. Only negative
C. Both positive and negative
D. None of the above

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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

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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

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The signal generator generally used in the laboratories is___________oscillator?

A. Wien-bridge
B. Hartely
C. Crystal
D. Phase shift

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If one of the resistors in a parallel circuit is removed, the total resistance_____________?

A. Decreases
B. Increases
C. Remains the same
D. Doubles

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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

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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

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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

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Six resistors are in parallel. The two lowest-value resistors are both 1.2 kΩ. The total resistance______________?

A. Is less than 6 kω
B. Is greater than 1.2 kω
C. Is less than 1.2 kω
D. Is less than 600 ω

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In Colpitt’s oscillator, feedback is obtained___________?

A. by magnetic induction
B. By a tickler coil
C. From the centre of split capacitors
D. None of the above

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