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Q1. Which one of the following phrasers best describes flux density?
(A) The concentration of lines of magnetic force
(B) The rate of change of the number of lines of magnetic force
(C) The opposition to a build-up of magnetic fields
(D) The force that maintains lines of force
Answer: (A) The concentration of lines of magnetic force
Q2. What kind of device is a diode?
(A) Bilateral
(B) Linear
(C) Nonlinear
(D) Unipolar
Answer: (C) Nonlinear
Q3. The transistor has a collector current of 2 mA. If the current gain is 135, what is the base current?
(A) 14.8 µA
(B) 10.3 µA
(C) 7.8 µA
(D) 7.75 µA
Answer: (A) 14.8 µA
Q4. A device that converts thermal energy to electrical energy is called a:
(A) Thermocouple
(B) Solar cell
(C) Chemical cell
(D) Piezoelectric devices
Answer:(A) Thermocouple
Q5. Absolute Zero temperature equals
(A) 0o C
(B) –273o C
(C) –276o C
(D) 25o C
Answer:(B) –273o C
Q6. In a step-down transformer, which is larger?
(A) Primary voltage
(B) Secondary voltage
(C) Impossible to say
(D) None of the above
Answer: (A) Primary voltage
Q7. Current can flow through a normally open push button switch as long as:
(A) You are pressing the button
(B) You are not pressing the button
(C) Its contact remain open
(D) Its contact remain open
Answer: (C) The impedance is greater than either the resistance or capacitive reactance but less than their sum
Q8. 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
Answer: (C) The impedance is greater than either the resistance or capacitive reactance but less than their sum
Q9. At room temperature a conductor has low many holes?
(A) Same number as free electrons
(B) Only those produced by thermal energy
(C) Less than the free electrons
(D) None of the above
Answer: (A) Same number as free electrons
Q10. When the graph of current versus voltage is a straight line, the device is referred to as
(A) Active
(B) Linear
(C) Nonlinear
(D) Bipolar
Answer: (B) Linear
Q11. When operating below its resonant frequency, a parallel RLC circuit has the characteristics of a:
(A) Parallel RL circuit
(B) Parallel RC circuit
(C) Parallel RLC circuit operated above its resonant frequency
(D) Purely resistive circuit
Answer: (A) Parallel RL circuit
Q12. A diode is in series with 220W. If the voltage across the resister is 4V, what is the current through the diode?
(A) 55 A
(B) 55.86 A
(C) 18.2 mA
(D) 16.3 mA
Answer: (C) 18.2 mA
Q13. What is the impedance of a circuit composed of a 100 ohm resistor connected in parallel with an inductor that has a reactance of 200 W?
(A) 77.7 ohm
(B) 89.3 ohm
(C) 88.8 ohm
(D) 224 ohm
Answer: (B) 89.3 ohm
Q14. What is the impedance of a circuit composed of a 100 ohm resistor connected in parallel with a capacitor that has a reactance of 100 ohm?
(A) 60 Ohm
(B) 99.3 Ohm
(C) 250 Ohm
(D) 70.7Ohm
Answer: (D) 70.7Ohm
Q15. When operating above its resonant frequency, a series RLC circuit has the characteristics of a:
(A) Series RL circuit
(B) Series RC circuit
(C) Series RLC circuit operated below its resonant frequency
(D) Purely resistive circuit
Answer: (A) Series RL circuit
Electronic Principles MCQ – All Set
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