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MCQOPTIONS
This section includes 4320 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 3901. |
The barrier potential accross each depletion layer is |
| A. | 0 |
| B. | 0.8 V |
| C. | 0.7 V |
| D. | 20 V |
| E. | None of the above |
| Answer» D. 20 V | |
| 3902. |
Which one of the following properties of a magnetic circuit can be directly compared to voltage in an electrical circuit? |
| A. | Flux density |
| B. | Number of lines of force |
| C. | Magnetomotive force |
| D. | Reluctance |
| E. | None of the above |
| Answer» D. Reluctance | |
| 3903. |
The equivalent of 1 kV is: |
| A. | 1.00 V |
| B. | 1000 V |
| C. | 100 mV |
| D. | 1000 mV |
| E. | None of the above |
| Answer» C. 100 mV | |
| 3904. |
The period of a waveform is: |
| A. | the time required to complete one full cycle |
| B. | the number of cycles completed in one second |
| C. | the time required for the voltage to rise from 10% to 90% of the peak amplitude |
| D. | equal to 0.707 times the peak amplitude |
| E. | None of the above |
| Answer» B. the number of cycles completed in one second | |
| 3905. |
Which one of the following statements is true for the voltage in a parallel RL circuit? |
| A. | The voltage always has the same amplitude and phase for every part of the circuit |
| B. | The total voltage is equal to the sum of the voltages across the resistance and inductance |
| C. | The total voltage lags the total current by less than 90 |
| D. | The total voltages is less than the sum of the voltages across the resistance and inductance |
| E. | None of the above |
| Answer» B. The total voltage is equal to the sum of the voltages across the resistance and inductance | |
| 3906. |
A low-pass filter: |
| A. | passes lower-frequency signals and reduces higher-frequency signals |
| B. | passes higher-frequency signals and reduces lower-frequency signals |
| C. | has no effect on ac signals |
| D. | reduces the level of all frequencies by a significant amount |
| E. | None of the above |
| Answer» B. passes higher-frequency signals and reduces lower-frequency signals | |
| 3907. |
What is one important thing transistors do? |
| A. | Emit light |
| B. | Amplify weak signals |
| C. | Regulate voltage |
| D. | Rectify line voltage |
| E. | None of the above |
| Answer» C. Regulate voltage | |
| 3908. |
At room temperature an intrinsic silicon crystal acts approximately like |
| A. | a battery |
| B. | a conductor |
| C. | an insulator |
| D. | a piece of copper wire |
| E. | None of the above |
| Answer» D. a piece of copper wire | |
| 3909. |
What kind of battery is most likely included in a cordless electric knife? |
| A. | Zinc-carbon battery |
| B. | Mercury-cell battery |
| C. | Nicad battery |
| D. | Lead-acid battery |
| E. | None of the above |
| Answer» C. Nicad battery | |
| 3910. |
A step-down transformer has turns ration of 5:1. If the primary voltage is 120 Vrms, what is the secondary voltage? |
| A. | 12 V |
| B. | 18 V |
| C. | 24 V |
| D. | 30 V |
| E. | None of the above |
| Answer» D. 30 V | |
| 3911. |
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 |
| E. | None of the above |
| Answer» C. Ideal voltage source and series resistor | |
| 3912. |
Doubling the operating frequency of a capacitive circuit: |
| A. | doubles the amount of a capacitive reactance |
| B. | has no effect on the capacitive reactance |
| C. | cuts the capacitive reactance in half |
| D. | multiplies the capacitive reactance by 6.28 |
| E. | None of the above |
| Answer» D. multiplies the capacitive reactance by 6.28 | |
| 3913. |
The total capacitive reactance of a parallel capacitor circuit is: |
| A. | equal to the sum of the individual capacitive-reactance values |
| B. | equal to the sum of the individual capacitance values |
| C. | equal to the source voltage divided by total current |
| D. | less than the capacitance value of the smallest capacitor |
| E. | None of the above |
| Answer» D. less than the capacitance value of the smallest capacitor | |
| 3914. |
Thevenin 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 |
| E. | None of the above |
| Answer» D. Ideal current source and series resistor | |
| 3915. |
What kind of device is a diode? |
| A. | Bilateral |
| B. | Linear |
| C. | Nonlinear |
| D. | Unipolar |
| E. | None of the above |
| Answer» D. Unipolar | |
| 3916. |
Who invented the first junction transistor? |
| A. | Smith |
| B. | Gomes |
| C. | Fisher |
| D. | Shockley |
| E. | None of the above |
| Answer» E. None of the above | |
| 3917. |
Which one of the following statements applies to common, non-rechargeable flashlight batteries? |
| A. | Common flashlight batteries are secondary wet-cell batteries |
| B. | Common flashlight batteries are primary wet-cell batteries |
| C. | Common flashlight batteries are primary dry-cell batteries |
| D. | Common flashlight batteries are secondary dry-cell batteries |
| E. | None of the above |
| Answer» D. Common flashlight batteries are secondary dry-cell batteries | |
| 3918. |
When a series RLC circuit is operating at its resonant frequency: |
| A. | capacitive reactance is greater than the inductive reactance |
| B. | inductive reactance is greater than the capacitive reactance |
| C. | inductive reactance is equal to the capacitive reactance |
| D. | the difference between inductive and capacitive reactance is equal to the resistance |
| E. | None of the above |
| Answer» D. the difference between inductive and capacitive reactance is equal to the resistance | |
| 3919. |
What causes the depletion layer? |
| A. | Doping |
| B. | Recombination |
| C. | Barrier potential |
| D. | Ions |
| E. | None of the above |
| Answer» D. Ions | |
| 3920. |
Which one of the following statements most accurately reflects the nature of ac power? |
| A. | The current in an ac circuit flows in one direction, but changes value periodically |
| B. | The current in an ac circuit flows in one direction at a steady level |
| C. | The current in an ac circuit changes direction periodically |
| D. | The current in an ac circuit flows in two directions at the same time |
| E. | None of the above |
| Answer» D. The current in an ac circuit flows in two directions at the same time | |
| 3921. |
The net charge of a neutral copper atom is |
| A. | 0 |
| B. | +1 |
| C. | -1 |
| D. | +4 |
| E. | None of the above |
| Answer» C. -1 | |
| 3922. |
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 |
| E. | None of the above |
| Answer» D. less than the inductance value of the smallest inductor | |
| 3923. |
Which one of the following statements best applies to a series RLC circuit? |
| A. | The voltage waveform for each component always has the same amplitude and phase as the applied voltage |
| B. | The current waveform for each component always has the same amplitude and phase as the applied current |
| C. | All of the above |
| D. | The sum of the current is always less than the applied current |
| E. | None of the above |
| Answer» C. All of the above | |
| 3924. |
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 |
| E. | None of the above |
| Answer» C. round off both the voltage and current waveforms | |
| 3925. |
Which one of the following properties of a magnetic circuit can be directly compared to current in an electrical circuit? |
| A. | Number of lines of force |
| B. | Flux density |
| C. | Reluctance |
| D. | Magnetomotive force |
| E. | None of the above |
| Answer» B. Flux density | |
| 3926. |
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 |
| E. | None of the above |
| Answer» D. 208 V | |
| 3927. |
A transistor has a current gain of 125 and a base current of 30 A. What is the collector current? |
| A. | 3.75 mA |
| B. | 3.2 mA |
| C. | 0.05 mA |
| D. | 13 mA |
| E. | None of the above |
| Answer» B. 3.2 mA | |
| 3928. |
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 |
| E. | None of the above |
| Answer» D. The total voltage is greater than the sum of the voltages across the resistance and capacitance | |
| 3929. |
Which one of the following principles best describes the basic operation of a generator? |
| A. | Like magnetic poles repel; unlike poles attract |
| B. | Current is induced in a conductor that is moving through a magnetic field |
| C. | Like magnetic poles attract; unlike poles repel |
| D. | Current flowing through a conductor generates a magnetic field |
| E. | None of the above |
| Answer» C. Like magnetic poles attract; unlike poles repel | |
| 3930. |
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 |
| E. | None of the above |
| Answer» B. emitter current | |
| 3931. |
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 |
| E. | None of the above |
| Answer» C. 445 ohm | |
| 3932. |
What is the algebraic sum of this series of values:+2, -3, -6,+4? |
| A. | -6 |
| B. | -3 |
| C. | 0 |
| D. | +2 |
| E. | None of the above |
| Answer» C. 0 | |
| 3933. |
When operating below 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 |
| E. | None of the above |
| Answer» B. parallel RC circuit | |
| 3934. |
A battery is a device composed of one or more: |
| A. | chemical cells |
| B. | voltage generators |
| C. | solar cells |
| D. | piezoeletric cells |
| E. | None of the above |
| Answer» B. voltage generators | |
| 3935. |
How much current flows through a 0.02-H choke that is operating from a 12-V ac, 100-Hz source? |
| A. | 0.02 A |
| B. | 0.955 A |
| C. | 10 A |
| D. | 2.02 A |
| E. | None of the above |
| Answer» C. 10 A | |
| 3936. |
The knee voltage of a diode is approximately equal to the |
| A. | Applied voltage |
| B. | Barrier potential |
| C. | Breakdown voltage |
| D. | Forward voltage |
| E. | None of the above |
| Answer» C. Breakdown voltage | |
| 3937. |
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 |
| E. | None of the above |
| Answer» B. doubles the amount of capacitive reactance | |
| 3938. |
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 |
| E. | None of the above |
| Answer» D. 550 Ohm | |
| 3939. |
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 |
| E. | None of the above |
| Answer» D. equal to 1.41 times the peak amplitude | |
| 3940. |
Which one of the following is a direct statement of Ohm's law? |
| A. | The voltage drop across a resistance is proportional to the value of resistance and the amount of current flowing through it |
| B. | The total resistance of a parallel circuit is less than the value of the smallest resistance |
| C. | The algebraic sum of voltages in a loop is equal to zero |
| D. | The algebraic sum of currents entering and leaving a point is equal to zero |
| E. | None of the above |
| Answer» B. The total resistance of a parallel circuit is less than the value of the smallest resistance | |
| 3941. |
A high-pass filter: |
| A. | passes lower-frequency signals and reduces higher-frequency signals |
| B. | passes higher-frequency signals and reduces lower-frequency signals |
| C. | has no effect on ac signals |
| D. | increases the level of all frequencies by a significant amount |
| E. | None of the above |
| Answer» C. has no effect on ac signals | |
| 3942. |
What form of energy is used to maintain an imbalance of charges between the terminals of a battery? |
| A. | Electronical energy |
| B. | Mechanical energy |
| C. | Chemical energy |
| D. | Solar energy |
| E. | None of the above |
| Answer» D. Solar energy | |
| 3943. |
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 |
| E. | None of the above |
| Answer» D. Hysteresis is most apparent when the core material is saturated | |
| 3944. |
Which one of the following devices is most often used for measuring opposition to current flow in a circuit? |
| A. | Ammeter |
| B. | Voltmeter |
| C. | Ohmmeter |
| D. | Wattmeter |
| E. | None of the above |
| Answer» D. Wattmeter | |
| 3945. |
Which one of the following phrases best describes residual magnetism? |
| A. | Magnetism that remains in the core of an electromagnet after the current through the coil is turned off |
| B. | The force of attraction between the poles of a permanent and temporary magnetic field |
| C. | The amount of magnetic flux that is not confined to the core material of an electromagnet |
| D. | The circular magnetic field that surrounds a conductor carrying a current |
| E. | None of the above |
| Answer» B. The force of attraction between the poles of a permanent and temporary magnetic field | |
| 3946. |
A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current? |
| A. | 7.8 mA |
| B. | 208 mA |
| C. | 200 mA |
| D. | 300 mA |
| E. | None of the above |
| Answer» C. 200 mA | |
| 3947. |
What is the total resistance of a series circuit that contains four resistors having values of 220W, 470W, 1W, and 1.2W? |
| A. | 692.2 Ohm |
| B. | 844.5 Ohm |
| C. | 3890 Ohm |
| D. | 1234 Ohm |
| E. | None of the above |
| Answer» B. 844.5 Ohm | |
| 3948. |
Holes act like: |
| A. | Atoms |
| B. | Crystals |
| C. | Negative charges |
| D. | Positive charges |
| E. | None of the above |
| Answer» E. None of the above | |
| 3949. |
How may valence electrons does a silicon atom have? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 4 |
| E. | None of the above |
| Answer» E. None of the above | |
| 3950. |
Reducing the amount of current through an inductor: |
| A. | reduces the value of inductance by one-half |
| B. | multiplies the value of inductance by four |
| C. | multiplies the value of inductance by two |
| D. | has no effect on the inductance |
| E. | None of the above |
| Answer» E. None of the above | |