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Q1. 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
Answer:(A) 200 W
Q2. Suppose the voltage from a power outlet is 120 Vrms. What is the peak voltage?
(A) 100 V
(B) 120 V
(C) 170 V
(D) 180 V
Answer: (C) 170 V
Q3. Which is the most widely used semiconductor?
(D) None of the above
Q4. Silicon atoms combine into an orderly pattern called a
(B) Covalent bond
(D) Valence orbit
Answer: (A) Crystal
Q5. A zener regulator has an input voltage from 15 to 20 V and a load current from 5 to 20 mA. If the zener voltage is 6.8 V, what value should the series resistor have?
(A) 310 Ohm
(B) 400 Ohm
(C) 410 Ohm
(D) 550 Ohm
Answer:(C) 410 Ohm
Q6. Which one of the following statements most accurately applies to the frequency of a waveform?
(A) The actual frequency of a sine waveform is 1.41 times the working frequency
(B) Unless specified otherwise, the frequency of a waveform is assumed to be 60 Hz
(C) The higher the amplitude of a waveform, the higher its frequency
(D) The longer the period of a waveform, the lower its frequency
Answer: (A) The actual frequency of a sine waveform is 1.41 times the working frequency
Q7. The equivalent of 1 megohms is:
(A) 1 k ohm
(B) 100,000 ohm
(C) One-millionth of an ohm
(D) One million ohms
Answer: (D) One million ohms
Q8. Most AC power is obtained from:
Answer: (C) Oscillators
Q9. At room temperature an intrinsic semiconductor has
(A) A few free electrons and holes
(B) Many holes
(C) Many free electrons
(D) No holes
Answer: (A) A few free electrons and holes
Q10. Which one of the following statements applies to common auto batteries?
(A) Auto batteries are primary wet-cell batteries
(B) Auto batteries are secondary wet-cell batteries
(C) Auto batteries are secondary dry-cell batteries
(D) Auto batteries are primary dry-cell batteries
Answer: (B) Auto batteries are secondary wet-cell batteries
Q11. How may valence electrons does a silicon atom have?
Answer: (D) 4
Q12. What is the total resistance of a parallel circuit that contains two resistors having values of 220 ohm and 470 ohm?
(A) 220 ohm
(B) 150 ohm
(C) 445 ohm
(D) 690 ohm
Answer: (B) 150 ohm
Q13. The emitter diode is usually
(D) Operating in the breakdwon region
Answer: (A) Forward-biased
Q14. The primary impedance of a transformer is 60 ohm and the secondary impedance is 120 ohm. What is the impedance ratio?
Answer: (C) 0.5
Q15. A battery is a device composed of one or more:
(A) Chemical cells
(B) Voltage generators
(C) Solar cells
(D) Piezoeletric cells
Answer: (A) Chemical cells
Electronic Principles MCQ – All Set
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