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Q1. In an intrinsic semiconductor, the number of free electrons
(A) Equals the number of holes
(B) Is less than the number of holes
(C) Is greater than the number of holes
(D) Impossible to say
Answer: (A) Equals the number of holes
Q2. If N1/N2 = 2, and the primary voltage is 120 V, what is the secondary voltage?
(A) 0 V
(B) 36 V
(C) 40 V
(D) 60 V
Answer:(D) 60 V
Q3. Which one of the following phrases most accurately describes a purely inductive circuit?
(A) Resistances provide the only opposition to current flow
(B) Inductive reactance provides the only opposition to current flow
(C) Combinations of resistance and inductive reactance provide any opposition to current flow
(D) The ac voltage lags the current by 90 degree
Answer: (B) Inductive reactance provides the only opposition to current flow
Q4. The valence electron of a copper atom experiences what kind of attraction toward the nucleus?
(D) Impossible to say
Answer: (C) Weak
Q5. At cut off, the Q point is at
(A) Upper end of the load line
(B) Middle of the load line
(C) Lower end of the load line
Answer: (C) Lower end of the load line
Q6. Household light bulbs have a given power rating, and they operate at 120 V. Which one of the following equations most directly provides the current rating of these light bulbs?
(A) P = I2R
(B) P = IE
(C) P = E2/R
(D) I = P/E
Answer: (D) I = P/E
Q7. What is the power dissipation of a resistance that has 24 V dropped across it and 0.25 A flowing through it?
(A) 3 W
(B) 6 W
(C) 64 W
(D) 122 W
Answer: (B) 6 W
Q8. When the collector current increases, what does the current gain do?
(B) Stays the same
(D) None of the above
Answer: (C) Increases
Q9. Which one of the following is most likely used for measuring the rate of electron flow?
Answer: (B) Ammeter
Q10. Doubling the number of turns of wire in an inductor:
(A) Reduces the value of inductance by one-half
(B) Multiplies the value of inductance by two
(C) Multiplies the value of inductance by four
(D) Reduces the value of inductance by one-fourth
Answer: (C) Multiplies the value of inductance by four
Q11. How many types of flow are there in a semiconductor?
Answer: (B) 1
Q12. How much current flows through a 60-W light bulb that is operating at 120 V?
(B) 180 A
(C) 2 A
(D) 7200 A
Answer: (A) 0.5A
Q13. In a pure inductor:
(A) AC current leads the voltage by 90 degree
(B) AC current and voltage are exactly in phase
(C) AC current lags the voltage by 90 degree
(D) AC current is converted to dc voltage
Answer: (C) AC current lags the voltage by 90 degree
Q14. An ideal voltage source has
(A) Zero internal resistance
(B) Infinite internal resistance
(C) A load dependent voltage
(D) A load-dependent current
Answer: (A) Zero internal resistance
Q15. Doubling the operating voltage of a purely capacitive circuit:
(A) Has no effect on the capacitive reactance
(B) Doubles the amount of capacitive reactance
(C) Multiplies the capacitive reactance by 7
(D) Cuts the capacitive reactance in half
Answer: (A) Has no effect on the capacitive reactance
Electronic Principles MCQ – All Set
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