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Q1. A device that converts chemical energy to electrical energy is called a:
(A) Solar cell
(B) Thermocouple
(C) Chemical cell
(D) Electric device
Answer: (C) Chemical cell
Q2. An unloaded zener regulator has a source voltage of 20 V, a series resistance of 330 W, and a zener voltage of 12 V, What is the Zener current?
(A) 28.4 mA
(B) 24.2 mA
(C) 34.4 mA
(D) 68.4 mA
Answer: (B) 24.2 mA
Q3. When operating above 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:(B) Parallel RC circuit
Q4. Which one of the following statements is true?
(A) Inductive reactance decreases with operating frequency
(B) Inductive reactance is at a maximum for dc source voltages
(C) Inductive reactance increases with operating frequency
(D) There is no meaningful relationship between inductive reactance and operating frequency
Answer: (C) Inductive reactance increases with operating frequency
Q5. A typical light switch in your home is a:
(A) Knife switch
(B) Toggle switch
(C) Rotary switch
(D) Momentary push button switch
Answer: (B) Toggle switch
Q6. When the Q point moves along the load line, the voltage increases when the current
(A) Decreases
(B) Stays the same
(C) Increases
(D) Can be any of above
Answer: (C) Increases
Q7. A resistor has a rated value of 100 ohm and a tolerance of 10%. What is its minimum and maximum allowable resistance value?
(A) 90 Ohm – 101 ohm
(B) 90 Ohm – 110 ohm
(C) 98 Ohm – 100.1 ohm
(D) 99 Ohm – 102 ohm
Answer: (B) 90 Ohm – 110 ohm
Q8. The merging of a free electron and a hole is called
(A) Covalent bonding
(B) Lifetime
(C) Recombination
(D) Thermal energy
Answer: (B) Lifetime
Q9. What is the smallest number of polarities required for current flow?
(A) One – a negative terminal
(B) Two – a negative terminal and a positive terminal
(C) Three – negative, positive and neutral terminals
(D) Four – two negative and two positive
Answer: (B) Two – a negative terminal and a positive terminal
Q10. For normal operation of the transistor, the collector diode has to be
(A) Forward-biased
(B) Reverse-biased
(C) Non-conducting
(D) Operating in the breakdown region
Answer: (B) Reverse-biased
Q11. A step-up transformer has a turns ratio of 1:4. If the line voltage is 115 V rms, what is the peak secondary voltage?
(A) 700 V
(B) 707 V
(C) 651 V
(D) 208 V
Answer: (C) 651 V
Q12. Norton’s theorem replaces a complicated circuit facing a load by an
(A) Ideal voltage source and parallel resistor
(B) Ideal current source and parallel resistor
(C) Ideal voltage source and series resistor
(D) Ideal current source and series resistor
Answer:(B) Ideal current source and parallel resistor
Q13. Which one of the following equations most directly leads to the resistance of an ordinary household light bulb, assuming that you know the power and voltage rating?
(A) R = E2/P
(B) P = PR
(C) P = E2/R
(D) I = P/E
Answer: (A) R = E2/P
Q14. The current gain of a transistor is defined as the ratio of the collector current to the
(A) Base current
(B) Emitter current
(C) Supply current
(D) Collector current
Answer: (A) Base current
Q15. When applying a square waveform to a capacitor, the circuit tends to:
(A) Peak the voltage and round off the current waveforms
(B) Peak the current and round off the voltage waveforms
(C) Round off both the voltage and current waveforms
(D) Peak both the voltage and current waveforms
Answer: (B) Peak the current and round off the voltage waveforms
Electronic Principles MCQ – All Set
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