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MCQOPTIONS
This section includes 1728 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 501. |
When a Wheatstone bridge is in a balanced condition, the center voltmeter in the bridge will read: |
| A. | twice the source voltage |
| B. | the same as the source voltage |
| C. | zero volts |
| D. | half the source voltage |
| Answer» D. half the source voltage | |
| 502. |
When a load is connected to a voltage divider, the total resistance of the circuit will: |
| A. | decrease |
| B. | double |
| C. | increase |
| D. | remain the same |
| Answer» B. double | |
| 503. |
Holding current for an SCR is best described as |
| A. | the minimum current required for turn-off |
| B. | the current required before an SCR will turn on |
| C. | the amount of current required to maintain conduction |
| D. | the gate current required to maintain conduction |
| Answer» D. the gate current required to maintain conduction | |
| 504. |
What is the voltage across the inductor in the given circuit on the falling edge of the first input pulse? |
| A. | 0.2 V |
| B. | 0.2 V |
| C. | 9.8 V |
| D. | 9.8 V |
| Answer» B. 0.2 V | |
| 505. |
Which of the following is true for a capacitor? |
| A. | A capacitor acts like a short to instantaneous changes in current. |
| B. | A capacitor's voltage cannot change instantaneously. |
| C. | A capacitor acts like an open to dc. |
| D. | All of the above |
| Answer» E. | |
| 506. |
If the capacitor in an RC integrator shorts, the output |
| A. | is at ground |
| B. | would measure the same as the input |
| C. | would measure zero volts |
| D. | None of the above |
| Answer» B. would measure the same as the input | |
| 507. |
When the current through a coil reverses direction, the magnetic field around the coil _____. |
| A. | does not change |
| B. | disappears |
| C. | increases in strength |
| D. | reverses direction |
| Answer» E. | |
| 508. |
A capacitor and an output resistor form a series circuit with a square wave applied. The circuit is: |
| A. | an integrator |
| B. | a differentiator |
| C. | a multiplier |
| D. | a divider |
| Answer» C. a multiplier | |
| 509. |
What is the moving part of a linear variable differential transformer? |
| A. | Primary |
| B. | Secondary |
| C. | Diaphragm |
| D. | Core |
| Answer» E. | |
| 510. |
What is the zero-voltage switch used for? |
| A. | To reduce radiation of high frequencies during turn-on of a high current to a load |
| B. | To control low-voltage circuits |
| C. | To provide power to a circuit when power is lost |
| D. | For extremely low-voltage applications |
| Answer» B. To control low-voltage circuits | |
| 511. |
Temperature sensing can be achieved by the use of |
| A. | thermocouples |
| B. | RTDs |
| C. | thermistors |
| D. | All of the above |
| Answer» E. | |
| 512. |
The purpose of compensation for a thermocouple is |
| A. | to decrease temperature sensitivity |
| B. | to increase voltage output |
| C. | to cancel unwanted voltage output of a thermocouple |
| D. | used for high-temperature circuits |
| Answer» D. used for high-temperature circuits | |
| 513. |
The change in value of an analog signal during the conversion process produces what is called the |
| A. | quantization error |
| B. | resolution error |
| C. | Nyquist error |
| D. | sampling error |
| Answer» B. resolution error | |
| 514. |
Which of the following performance specifications applies to a sample-and-hold circuit? |
| A. | Aperture time |
| B. | Aperture droop |
| C. | Feedback |
| D. | Acquisition jitter |
| Answer» B. Aperture droop | |
| 515. |
The given circuit is an |
| A. | RL integrator |
| B. | RC differentiator |
| C. | RL differentiator |
| D. | RC integrator |
| Answer» E. | |
| 516. |
What is a shift register that will accept a parallel input and can shift data left or right called? |
| A. | tri-state |
| B. | end around |
| C. | bidirectional universal |
| D. | conversion |
| Answer» D. conversion | |
| 517. |
What happens to the parallel output word in an asynchronous binary down counter whenever a clock pulse occurs? |
| A. | The output word decreases by 1. |
| B. | The output word decreases by 2. |
| C. | The output word increases by 1. |
| D. | The output word increases by 2. |
| Answer» B. The output word decreases by 2. | |
| 518. |
When the output of a tri-state shift register is disabled, the output level is placed in a: |
| A. | float state |
| B. | LOW state |
| C. | high impedance state |
| D. | float state and a high impedance state |
| Answer» E. | |
| 519. |
A comparison between ring and johnson counters indicates that: |
| A. | a ring counter has fewer flip-flops but requires more decoding circuitry |
| B. | a ring counter has an inverted feedback path |
| C. | a johnson counter has more flip-flops but less decoding circuitry |
| D. | a johnson counter has an inverted feedback path |
| Answer» E. | |
| 520. |
What is meant by parallel-loading the register? |
| A. | Shifting the data in all flip-flops simultaneously |
| B. | Loading data in two of the flip-flops |
| C. | Loading data in all four flip-flops at the same time |
| D. | Momentarily disabling the synchronous SET and RESET inputs |
| Answer» D. Momentarily disabling the synchronous SET and RESET inputs | |
| 521. |
A repetitive pulse with a 50% duty cycle is being applied to the input of an RC integrator. If one time constant is less than one-fifth the pulse width, the capacitor will be able to fully charge and discharge. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 522. |
RTDs are typically connected with other fixed resistors |
| A. | in a pi configuration |
| B. | in a bridge configuration |
| C. | and variable resistors |
| D. | and capacitors in a filter-type circuit |
| Answer» C. and variable resistors | |
| 523. |
All triacs operate in __________. |
| A. | quadrant 1 and quadrant 2 |
| B. | quadrant 1 and quadrant 3 |
| C. | quadrant 2 and quadrant 4 |
| D. | quadrant 3 and quadrant 4 |
| Answer» C. quadrant 2 and quadrant 4 | |
| 524. |
Permeability is the inverse equivalent of which electrical term? |
| A. | Voltage |
| B. | Current |
| C. | Resistance |
| D. | Conductance |
| Answer» D. Conductance | |
| 525. |
What theorem replaces a complex network with an equivalent circuit containing a source voltage and a series resistance? |
| A. | Multinetwork |
| B. | Norton |
| C. | Thevenin |
| D. | Superposition |
| Answer» D. Superposition | |
| 526. |
An RL integrator and an RC differentiator can act as what types of filters, respectively? |
| A. | low-pass, low-pass |
| B. | low-pass, high-pass |
| C. | high-pass, high-pass |
| D. | high-pass, low-pass |
| Answer» C. high-pass, high-pass | |
| 527. |
In a repetitive-pulse RC integrator circuit, what would the steady-state voltage equal at the end of the fifth pulse? Assume a Vin of 20 V. |
| A. | 1.46 V |
| B. | 14.62 V |
| C. | 20 V |
| D. | 0 V |
| Answer» C. 20 V | |
| 528. |
What is a circuit that produces short-duration spikes? |
| A. | A trigger pulse generator |
| B. | An RL integrator |
| C. | A timing circuit |
| D. | <br> |
| E. | A pulse waveform-to-dc converter |
| Answer» B. An RL integrator | |
| 529. |
When does maximum power transfer happen from the source to the load? |
| A. | When the source resistance is greater than the load resistance |
| B. | When the source resistance is less than the load resistance |
| C. | When there is negligible source resistance |
| D. | When the source resistance equals the load resistance |
| Answer» E. | |
| 530. |
Electricity may be generated by a wire: |
| A. | carrying current |
| B. | wrapped as a coil |
| C. | that has neutral domains |
| D. | passing through a flux field |
| Answer» E. | |
| 531. |
In a 20 Vac series RC circuit, if 20 V is measured across the resistor and 40 V is measured across the capacitor, the applied voltage is: |
| A. | 45 V |
| B. | 50 V |
| C. | 55 V |
| D. | 60 V |
| Answer» B. 50 V | |
| 532. |
The resistive change of a strain gauge |
| A. | is based on the weight placed upon it, but can be many thousands of ohms |
| B. | is usually no more than 100 |
| C. | <img src="/_files/images/basic-electronics/basics/omega.gif" alt="omega.gif" align="absmiddle"> |
| D. | is based on the gauge factor, but is typically less than an ohm |
| E. | has a positive temperature coefficient |
| Answer» D. is based on the gauge factor, but is typically less than an ohm | |
| 533. |
The output voltage of a typical thermocouple is |
| A. | less than 100 mV |
| B. | greater than 1 V |
| C. | Thermocouples vary resistance, not voltage. |
| D. | None of the above |
| Answer» B. greater than 1 V | |
| 534. |
The connections to a thermocouple |
| A. | can produce an unwanted thermocouple effect, which must be compensated for |
| B. | produce an extra desirable thermocouple effect |
| C. | must be protected, since high voltages are present |
| D. | produce an extra desirable thermocouple effect and must be protected, since high voltages are present |
| Answer» B. produce an extra desirable thermocouple effect | |
| 535. |
What is a varistor? |
| A. | a voltage-dependent resistor |
| B. | a voltage-dependent diode |
| C. | a current-dependent resistor |
| D. | a current-dependent diode |
| Answer» B. a voltage-dependent diode | |
| 536. |
When checking a good SCR or TRIAC with an ohmmeter it will: |
| A. | show high resistance in both directions |
| B. | show low resistance with positive on anode and negative on cathode, and high resistance when reversed |
| C. | show high resistance with negative on anode and positive on cathode, and low resistance when reversed |
| D. | show low resistance in both directions |
| Answer» B. show low resistance with positive on anode and negative on cathode, and high resistance when reversed | |
| 537. |
What device is similar to an RTD but has a negative temperature coefficient? |
| A. | Strain gauge |
| B. | Thermistor |
| C. | Negative-type RTD |
| D. | Thermocouple |
| Answer» C. Negative-type RTD | |
| 538. |
If the voltage across a fixed value of resistance is increased five times, what does the current do? |
| A. | It increases by a factor of five. |
| B. | It decreases by a factor of five. |
| C. | It stays the same. |
| D. | Not enough information |
| Answer» B. It decreases by a factor of five. | |
| 539. |
In a series parallel circuit consisting of R1 and R2 in series and connected in parallel with R3, if R1 opens, then R2's voltage will: |
| A. | increase |
| B. | decrease |
| C. | remain the same |
| D. | cannot tell |
| Answer» C. remain the same | |
| 540. |
If the current in the given circuit is increased to 24 mA, the source voltage must have tripled. |
| A. | True |
| B. | False |
| Answer» C. | |
| 541. |
A group of force lines going from the north pole to the south pole of a magnet is called the magnetic ___. |
| A. | retentivity |
| B. | reluctance |
| C. | hysteresis |
| D. | flux |
| Answer» E. | |
| 542. |
What is the voltage across the capacitor? |
| A. | 7.07 V |
| B. | 1.11 V |
| C. | 111 mV |
| D. | 7.07 mV |
| Answer» D. 7.07 mV | |
| 543. |
Ceramic capacitors have higher voltage ratings than electrolytic capacitors. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 544. |
The phase angle in the given circuit equals___. |
| A. | 90 |
| B. | 36.87 |
| C. | 0 |
| D. | 53.13 |
| Answer» C. 0 | |
| 545. |
Lenz's law states that the current induced in a circuit due to a change in the magnetic field is so directed as to oppose the change in flux or to exert a mechanical force opposing the motion. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 546. |
Mutual induction is dependent on |
| A. | winding ratios |
| B. | output polarities |
| C. | dc voltage levels |
| D. | current changes |
| Answer» E. | |
| 547. |
What has the voltage across the resistor decayed to by the end of the pulse in the given circuit? |
| A. | 0 V |
| B. | 0.75 V |
| C. | 5.55 V |
| D. | 14.25 V |
| Answer» C. 5.55 V | |
| 548. |
If a 169.7 V half-wave peak has an average voltage of 54 V, what is the average of two full-wave peaks? |
| A. | 119.9 V |
| B. | 108.0 V |
| C. | 115.7 V |
| D. | 339.4 V |
| Answer» C. 115.7 V | |
| 549. |
The peak inverse voltage (PIV) for the diode in the give circuit equals ___. |
| A. | 3 V |
| B. | 2.3 V |
| C. | 0 V |
| D. | 6 V |
| Answer» B. 2.3 V | |
| 550. |
This circuit is operating in a closed-loop mode. |
| A. | True |
| B. | False |
| Answer» C. | |