Electronic Principles MCQ Questions & Answers

1

Which one of the following statements is true for the voltages in a series RL circuit?

A) The total voltages is equal to the sum of the voltages across the resistance and inductance B) The voltage always has the same amplitude and phase for every part of the circuit C) The total voltage is less than the sum of the voltages across the resistance and inductance D) The total voltage lags the total current by less than 90 E) None of the above

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Answer & Solution

Answer: Option C

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2

The core of an electromagnet is said to be in saturation when:

A) the core is permitted to move freely within the coil B) an increase in current through the coil causes no further increase in the mmf C) frequent changes in the direction of current through the coil causes heating effects in the core material D) changing the polarity of the current in the coil changes the polarity of the magnetic field around the core E) None of the above

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Answer & Solution

Answer: Option B

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3

As the temperature increases, the current gain

A) increases B) decreases C) contant D) can be any of the above E) None of the above

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Answer & Solution

Answer: Option A

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4

Assuming 100% efficiency, what is the power being consumed at the secondary winding of the transformer described in question 91?

A) 200 W B) 1000 W C) 20 W D) 100 W E) None of the above

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Answer & Solution

Answer: Option A

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5

Doubling the diameter of the coil in an inductor:

A) multiplies the value of inductance by two B) reduces the value of inductance by one-half C) reduces the value of inductance by one-fourth D) multiplies the value of inductance by four E) None of the above

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Answer & Solution

Answer: Option A

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6

Which one of the following statements is true for the impedance of a series RC circuit?

A) The impedance is greater than the sum of the resistance and capacitive reactance B) The impedance is equal to the sum of the resistance and capacitive reactance C) The impedance is greater than either the resistance or capacitive reactance but less than their sum D) The impedance is less than the sum of the resistance and capacitive reactance E) None of the above

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Answer & Solution

Answer: Option C

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7

If a transistor operates at the middle of the load line, an increase in the current gain will move the Q point

A) down B) up C) nowhere D) off the load line E) None of the above

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Answer & Solution

Answer: Option B

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8

What is the turns ratio of a power transformer that shows 50 V at its secondary winding when you apply 150 V to its primary winding?

A) 01-Apr B) 01-Mar C) 2 D) 3 E) None of the above

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Answer & Solution

Answer: Option D

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9

What is the inductive reactance of a 0.1-H coil that is operating at 1000 Hz?

A) 100 Ohm B) Less than 1 Ohm C) 628 Ohm D) 444 Ohm E) None of the above

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Answer & Solution

Answer: Option C

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10

Which one of the following is a statement of KirchhofFs voltage law?

A) The total voltage in a parallel circuit is less than the value of the smallest voltage B) The algebraic sum of voltages in a loop is equal to zero C) The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it D) The algebraic sum of voltages entering and leaving a point is equal to zero E) None of the above

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Answer & Solution

Answer: Option B

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Electronic Principles MCQ Questions & Answers | Computer Science