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Q1. A power transformer steps 100 V down to 10 V. If the current in its primary winding is 2 A, what is the current in the secondary winding?
(A) 50 A
(B) 12 A
(C) 5 A
(D) 20 A
Answer: (D) 20 A
Q2. 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) 1/4
(B) 1/3
(C) 2
(D) 3
Answer: (D) 3
Q3. How many protons does the nucleus of a silicon atom contain?
(A) 4
(B) 29
(C) 14
(D) 48
Answer: (C) 14
Q4. What is the difference between a conductor and an insulator?
(A) A conductor allows current to flow much easier than an insulator does
(B) An insulator has an excessive number of free electrons, while a conductor has a few free electrons or none at all
(C) An insulator allows current to flow much easier than a conductor does
(D) The difference between conductors and insulators depends on how they are used
Answer: (A) A conductor allows current to flow much easier than an insulator does
Q5. The total capacitance of a series capacitor circuit is:
(A) Equal to the sun of the individual capacitive-reactance values
(B) Equal to the sum of the individual capacitance values
(C) Equal to the source voltage divided by total current
(D) Less than the value of the smallest capacitor
Answer: (D) Less than the value of the smallest capacitor
Q6. What is the barrier potential of a silicon diode at room temperature?
(A) 0.7 V
(B) 0.3V
(C) 1 V
(D) 2 mV per degree Celsius
Answer: (A) 0.7 V
Q7. Which one of the following principles best describes the basic operation of an electromagnet?
(A) Current is induced in a conductor that is moving through a magnetic field
(B) Like magnetic poles repel, while unlike poles attract
(C) Current flowing through a conductor generates a magnetic field
(D) Like magnetic poles attract, while unlike poles repel
Answer: (C) Current flowing through a conductor generates a magnetic field
Q8. Suppose a current source has an Ideal current of 10 mA and an internal resistance of 20 MW. For what values of load resistance will the current source appear stiff?
(A) 20 k Ohm or more
(B) 200 k Ohm or less
(C) 200 k Ohm or more
(D) 20 km or less
Answer:(B) 200 k Ohm or less
Q9. When a parallel RLC circuit is operating at its resonant frequency:
(A) Capacitive reactance is greater than the inductive reactance
(B) Inductive reactance is greater than the capacitive reactance
(C) Inductive reactance is equal to the capacitive reactance
(D) The difference between inductive and capacitive reactance is equal to the resistance
Answer: (C) Inductive reactance is equal to the capacitive reactance
Q10. Electron current is flowing through a conductor in a direction you might describe as straight into this page. What is the direction of the resulting magnetic field?
(A) Clockwise
(B) Counterclockwise
(C) Out of this page
(D) Into this page
Answer: (B) Counterclockwise
Q11. What is one important thing transistors do?
(A) Emit light
(B) Amplify weak signals
(C) Regulate voltage
(D) Rectify line voltage
Answer: (B) Amplify weak signals
Q12. When a series RLC circuit is operating at its resonant frequency:
(A) Capacitive reactance is greater than the inductive reactance
(B) Inductive reactance is greater than the capacitive reactance
(C) Inductive reactance is equal to the capacitive reactance
(D) The difference between inductive and capacitive reactance is equal to the resistance
Answer: (C) Inductive reactance is equal to the capacitive reactance
Q13. What is the total resistance of a series circuit that contains four resistors having values of 220W, 470W, 1W, and 1.2W?
(A) 692.2 Ohm
(B) 844.5 Ohm
(C) 3890 Ohm
(D) 1234 Ohm
Answer: (A) 692.2 Ohm
Q14. A low-pass filter:
(A) Passes lower-frequency signals and reduces higher-frequency signals
(B) Passes higher-frequency signals and reduces lower-frequency signals
(C) Has no effect on ac signals
(D) Reduces the level of all frequencies by a significant amount
Answer: (A) Passes lower-frequency signals and reduces higher-frequency signals
Q15. What causes the depletion layer?
(A) Doping
(B) Recombination
(C) Barrier potential
(D) Ions
Answer: (C) Barrier potential
Electronic Principles MCQ – All Set
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