MCQOPTIONS
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MCQOPTIONS
This section includes 231 Mcqs, each offering curated multiple-choice questions to sharpen your Computer Science knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
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» C. Auto batteries are secondary dry-cell batteries | |
| 202. |
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» B. 1000 W | |
| 203. |
A certain electromagnet has 1000 turns of wire. How much current must flow through the coil in order to generate an mmf of 100 ampere-turns? |
| A. | 0.1 A |
| B. | 1000 A |
| C. | 0.41666666666667 |
| D. | 100 A |
| Answer» C. 0.41666666666667 | |
| 204. |
As the temperature increases, the current gain |
| A. | increases |
| B. | decreases |
| C. | contant |
| D. | can be any of the above |
| Answer» B. decreases | |
| 205. |
The total inductive reactance of a parallel inductor circuit is: |
| A. | equal to the sum of the individual inductive-reactance values |
| B. | equal to the sum of the individual inductance values |
| C. | equal to the source voltage divided by total current |
| D. | less than the inductance value of the smallest inductor |
| Answer» D. less than the inductance value of the smallest inductor | |
| 206. |
An audio transformer has a turn ratio of 9, What is its impedance ratio? |
| A. | 81 |
| B. | 85 |
| C. | 6 |
| D. | 9 |
| Answer» B. 85 | |
| 207. |
If a load resistance is 1 kW, a stiff current source has a resistance of |
| A. | At least 10 Ohm |
| B. | Less than 10 Ohm |
| C. | More than 100 k Ohm |
| D. | Less than 100 k Ohm |
| Answer» D. Less than 100 k Ohm | |
| 208. |
The component that forms the electrical connection between the rotating coil of wire in a motor and the external source of electrical energy is called the: |
| A. | rotor |
| B. | armature |
| C. | battery |
| D. | commutator |
| Answer» E. | |
| 209. |
Which one of the following principles best describes the basic operation of an electromagnet? |
| A. | Current is induced in a conductor that is moving through a magnetic field |
| B. | Like magnetic poles repel, while unlike poles attract |
| C. | Current flowing through a conductor generates a magnetic field |
| D. | Like magnetic poles attract, while unlike poles repel |
| Answer» D. Like magnetic poles attract, while unlike poles repel | |
| 210. |
The total inductance of a series inductor circuit is: |
| A. | equal to the sum of the individual inductance values |
| B. | equal to the sum of the individual inductive-reactance values |
| C. | less than the value of the smallest inductor |
| D. | equal to the source voltage divided by total current |
| Answer» B. equal to the sum of the individual inductive-reactance values | |
| 211. |
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 |
| Answer» D. equal to 1.41 times the peak amplitude | |
| 212. |
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» E. | |
| 213. |
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» C. 88.8 ohm | |
| 214. |
What form of energy is used for creating static electricity? |
| A. | Solar energy |
| B. | Mechanical energy |
| C. | Chemical energy |
| D. | Light energy |
| Answer» E. | |
| 215. |
Which one of the following kinds of materials has the lowest permeability? |
| A. | A diamagnetic material |
| B. | A paramagnetic material |
| C. | A feiTomagnetic material |
| D. | All of the above |
| Answer» B. A paramagnetic material | |
| 216. |
For a pure capacitor: |
| A. | ac current and voltage are exactly in phase |
| B. | ac current leads the voltage by 90 degree |
| C. | ac current is converted to dc voltage |
| D. | ac current lags the voltage by 90 degree |
| Answer» C. ac current is converted to dc voltage | |
| 217. |
Which one of the following statements is true for the voltages in a series RC circuit? |
| A. | The total voltage is equal to the sum of the voltages across the resistance and capacitance |
| B. | The voltage always has the same amplitude and phase for every part of the circuit |
| C. | The total voltage is less than the sum of the voltages across the resistance and capacitance |
| D. | The total voltage is greater than the sum of the voltages across the resistance and capacitance |
| Answer» D. The total voltage is greater than the sum of the voltages across the resistance and capacitance | |
| 218. |
The rise time of a pulse waveform is the time required for the voltage to rise: |
| A. | from zero to its rms value |
| B. | from zero to its peak value |
| C. | from 10% of the peak value to 70.7% of the peak value |
| D. | from 10% of the peak value to 90% of the peak value |
| Answer» E. | |
| 219. |
A device that converts mechanical into electrical energy is? |
| A. | solar cell |
| B. | thermocouple |
| C. | chemical cell |
| D. | generator |
| Answer» E. | |
| 220. |
The knee voltage of a diode is approximately equal to the |
| A. | Applied voltage |
| B. | Barrier potential |
| C. | Breakdown voltage |
| D. | Forward voltage |
| Answer» C. Breakdown voltage | |
| 221. |
Which one of the following statements is true for current flowing in a parallel circuit? |
| A. | The amount of current flow through each branch of a parallel circuit can be different, depending on the resistance of each branch part and the amount of voltage applied to it |
| B. | The same current always flows through every part of a parallel circuit |
| C. | The total current in a parallel circuit is equal to the total voltage multiplied by the total resistance |
| D. | The total current in a parallel circuit is always less than the smallest amount of current |
| Answer» B. The same current always flows through every part of a parallel circuit | |
| 222. |
Which one of the following statements is true for the voltages in a series RL circuit? |
| A. | The total voltages is equal to the sum of the voltages across the resistance and inductance |
| B. | The voltage always has the same amplitude and phase for every part of the circuit |
| C. | The total voltage is less than the sum of the voltages across the resistance and inductance |
| D. | The total voltage lags the total current by less than 90 |
| Answer» D. The total voltage lags the total current by less than 90 | |
| 223. |
Which one of the following statements best describes magnetic hysteresis? |
| A. | Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet |
| B. | Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet |
| C. | Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently |
| D. | Hysteresis is most apparent when the core material is saturated |
| Answer» D. Hysteresis is most apparent when the core material is saturated | |
| 224. |
A dielectric material is: |
| A. | a good conductor |
| B. | a good insulator |
| C. | a poor conductor of electrostatic fields |
| D. | a good conductor of magnetic fields |
| Answer» C. a poor conductor of electrostatic fields | |
| 225. |
A certain power transformer has a turns ratio of 5. What voltage can you expect at the secondary winding when you apply 120 V to the primary winding? |
| A. | 4.73 |
| B. | 0.4 V |
| C. | 24 V |
| D. | 600 V |
| Answer» D. 600 V | |
| 226. |
How many types of flow are there in a semiconductor? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» C. 2 | |
| 227. |
The total impedance of a parallel RLC circuit: |
| A. | always increases as the applied frequency increases |
| B. | is equal to the sum of the values of resistance, inductive reactance and capacitive reactance |
| C. | always decreases as the applied frequency increases |
| D. | is maximum at the resonant frequency |
| Answer» E. | |
| 228. |
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» B. Unless specified otherwise, the frequency of a waveform is assumed to be 60 Hz | |
| 229. |
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 |
| Answer» D. 75 degree | |
| 230. |
1 Microfarad is the same as: |
| A. | 1 millionth of a picofarad |
| B. | 1000 millifarads |
| C. | 1 million picofarads |
| D. | 1 million farads |
| Answer» D. 1 million farads | |
| 231. |
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» B. Is less than the number of holes | |