Electronic Principles Questions pdf - Set 11 - ObjectiveBooks

# Practice Test: Question Set - 11

1. 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

2. 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

3. 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

4. Which one of the following phrases most accurately describes a purely capacitive circuit?
(A) Resistances provide the only opposition to current flow
(B) Capacitive reactance provides the only opposition to current flow
(C) The ac voltage leads the current by 90 degree
(D) Combinations of resistance and capacitive reactance provide any opposition to current flow

5. The equivalent of 1 micro A is:
(A) 10000 A
(B) 1000 A
(C) One-millionth of an ampere
(D) One million amperes

6. Which one of the following statements regarding ac circuits is correct?
(A) Current and voltages are in phase through a resistor
(B) Current leads the voltage through a resistor
(C) Current lags the voltage through a resistor
(D) None of the above

7. The rms value of a sine waveform is:
(A) The number of cycles completed in one second
(B) The time required to complete one full cycle
(C) Equal to 0.707 times the peak amplitude
(D) Equal to 1.41 times the peak amplitude

8. A real voltage source has
(A) Zero internal resistance
(B) Infinite internal resistance
(C) A small internal resistance
(D) A large internal resistance

9. What is the phase shift between total current and voltage in the circuit of a 100 ohm resistor connected in parallel with a capacitor that has a reactance of 100 ohm
(A) 180 degree
(B) 30 degree
(C) 45 degree
(D) 75 degree

10. Which one of the following statements is true for resistance in a parallel circuit?
(A) The total resistance is equal to the sum of the individual resistances in a parallel circuit
(B) The total resistance of a parallel circuit is always less than the value of the smallest resistance
(C) The total resistance of a parallel circuit is equal to the total voltage
(D) The total resistance in a parallel circuit is equal to the average value of the individual resistances

11. The number of free electrons and holes in intrinsic semiconductor increases when the temperature
(A) Decreases
(B) Increases
(C) Stays the same
(D) 0C

12. What kind of battery is most likely included in a cordless electric knife?
(A) Zinc-carbon battery
(B) Mercury-cell battery

13. Which one of the following statements is true for the currents in a parallel RC circuit?
(A) The total current is equal to the sum of the currents for the resistance and capacitance
(B) The current always has the same amplitude and phase for every part of the circuit
(C) The total current is less than the sum of the currents for the resistance and capacitance
(D) The total current is greater than the sum of the currents for the resistance and capacitance

14. Which one of the following statements is true?
(A) Capacitive reactance is at a minimum for dc source voltages
(B) Capacitive reactance decreases as the operating frequency increases
(C) There is no meaningful relationship between capacitive reactance and operating frequency
(D) Capacitive reactance increases as the operating frequency increases

15. A device that converts mechanical into electrical energy is?
(A) Solar cell
(B) Thermocouple
(C) Chemical cell
(D) Generator

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