MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 553 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 401. |
The impedance of an RL circuit varies inversely with frequency. |
| A. | True |
| B. | False |
| Answer» C. | |
| 402. |
In an RL circuit, part of the power is resistive and part is reactive. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 403. |
In a lag network, the output voltage lags the input voltage in phase. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 404. |
The roll-off rate of a basic RC or RL filter is 20 dB per decade. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 405. |
In an RL high-pass filter, the output is taken across the inductor and the output leads the input. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 406. |
In an RC high-pass filter, the output is taken across the resistor and the output leads the input. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 407. |
Critical frequencies are also called 3 dB frequencies. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 408. |
A series resonant band-stop filter consists of a 68 resistor, a 110 mH coil, and a 0.02 F capacitor. The internal resistance, RW, of the coil is 4 . Input voltage is 200 mV. Output voltage is taken across the coil and capacitor in series. What is the output voltage magnitude at f0? |
| A. | 1.1 mV |
| B. | 11.1 mV |
| C. | 111 mV |
| D. | 200 mV |
| Answer» C. 111 mV | |
| 409. |
A sinusoidal voltage with a peak-to-peak value of 18 V is applied to an RC low-pass filter. If the reactance at the input frequency is zero, the output voltage is |
| A. | 18 V peak-to-peak |
| B. | zero |
| C. | 9 V peak-to-peak |
| D. | 12.74 V peak-to-peak |
| Answer» C. 9 V peak-to-peak | |
| 410. |
Vout = 500 mV, and Vin = 1.3 V. The ratio Vout/ Vin expressed in dB is |
| A. | 0 dB |
| B. | 8.30 dB |
| C. | 8.30 dB |
| D. | 0.8 dB |
| Answer» D. 0.8 dB | |
| 411. |
An RL high-pass filter consists of a 470 resistor and a 600 mH coil. The output is taken across the coil. The circuit's critical frequency is |
| A. | 125 Hz |
| B. | 1,250 Hz |
| C. | 564 Hz |
| D. | 5,644 Hz |
| Answer» B. 1,250 Hz | |
| 412. |
A parallel resonant band-pass filter consists of a 6.8 resistor in series with a parallel network made up of an 8 H coil and a 120 pF capacitor. The output is taken across the capacitor/coil. Assume RW = 0 . What is the center frequency of the filter? |
| A. | 5.14 MHz |
| B. | 514 kHz |
| C. | 5.03 MHz |
| D. | 503 kHz |
| Answer» B. 514 kHz | |
| 413. |
A series resonant band-pass filter consists of a 2 mH coil, a 0.005 F capacitor, and a 120 resistor. The winding resistance of the coil is 12 . The output voltage is taken off the resistor. Input voltage is 12 Vrms. What is the output voltage magnitude at the center frequency (f0)? |
| A. | 10.9 V |
| B. | 1.09 V |
| C. | 1.1 V |
| D. | 12 V |
| Answer» B. 1.09 V | |
| 414. |
An RC low-pass filter consists of a 120 resistor and a 0.002 F capacitor. The output is taken across the capacitor. The circuit's critical frequency is |
| A. | 333 kHz |
| B. | 633 kHz |
| C. | 331 kHz |
| D. | 60 kHz |
| Answer» C. 331 kHz | |
| 415. |
Referring to Problem 15, if the input voltage is a 6 V sine wave with a dc level of 10 V, what is the output voltage magnitude? |
| A. | 6 V |
| B. | 597 mV |
| C. | 5.97 V |
| D. | 0 V |
| Answer» D. 0 V | |
| 416. |
A power factor of 1 indicates a purely reactive circuit, and a power factor of 0 indicates a purely resistive circuit. |
| A. | True |
| B. | False |
| Answer» C. | |
| 417. |
The power factor indicates how much of the apparent power is reactive power. |
| A. | True |
| B. | False |
| Answer» C. | |
| 418. |
In a certain parallel resonant band-pass filter, the resonant frequency is 14 kHz. If the bandwidth is 4 kHz, the lower frequency |
| A. | is 7 kHz |
| B. | is 10 kHz |
| C. | is 12 kHz |
| D. | cannot be determined |
| Answer» D. cannot be determined | |
| 419. |
An RL low-pass filter consists of a 5.6 mH coil and a 3.3 k resistor. The output voltage is taken across the resistor. The circuit's critical frequency is |
| A. | 93.8 kHz |
| B. | 93.8 Hz |
| C. | 861 Hz |
| D. | 86.12 kHz |
| Answer» B. 93.8 Hz | |
| 420. |
In a series resonant band-pass filter, a lower value of Q results in |
| A. | a higher resonant frequency |
| B. | a smaller bandwidth |
| C. | a higher impedance |
| D. | a larger bandwidth |
| Answer» E. | |
| 421. |
A parallel resonant band-pass filter consists of a 90 resistor in series with a parallel network made up of a 60 mH coil and a 0.02 F capacitor. The output is taken across the capacitor/coil. The coil winding has a resistance of 20 . What is the center frequency of the filter? |
| A. | 459 Hz |
| B. | 4,591 Hz |
| C. | 999 Hz |
| D. | 2,176 Hz |
| Answer» C. 999 Hz | |
| 422. |
The maximum output voltage of a certain low-pass filter is 15 V. The output voltage at the critical frequency is |
| A. | 0 V |
| B. | 15 V |
| C. | 10.60 V |
| D. | 21.21 V |
| Answer» D. 21.21 V | |
| 423. |
A 1.5 k resistor and a coil with a 2.2 k inductive reactance are in series across an 18 V ac source. The power factor is |
| A. | 564 |
| B. | 0.564 |
| C. | 6.76 |
| D. | 55.7 |
| Answer» C. 6.76 | |
| 424. |
The voltages in Problem 5 are measured at a certain frequency. To make the resistor voltage less than the inductor voltage, the frequency is |
| A. | increased |
| B. | decreased |
| C. | doubled |
| D. | not a factor |
| Answer» B. decreased | |
| 425. |
In a series RL circuit, 12 V rms is measured across the resistor, and 14 V rms is measured across the inductor. The peak value of the source voltage is |
| A. | 18.4 V |
| B. | 26.0 V |
| C. | 2 V |
| D. | 20 V |
| Answer» C. 2 V | |
| 426. |
To increase the current in a series RL circuit, the frequency |
| A. | should be increased |
| B. | should be decreased |
| C. | should be constant |
| D. | cannot be determined without values |
| Answer» C. should be constant | |
| 427. |
A 470 resistor and a coil with 125 inductive reactance are in parallel. Both components are across a 15 V ac voltage source. Current through the inductor is |
| A. | 152 mA |
| B. | 32 mA |
| C. | 12 mA |
| D. | 120 mA |
| Answer» E. | |
| 428. |
In an RL differentiator, when the input pulse goes from its low level to its high level, |
| A. | the inductor prevents a sudden change in voltage |
| B. | the inductor prevents a sudden change in current |
| C. | voltage across the inductor instantly reaches 63% of input voltage |
| D. | voltage across the inductor is zero |
| Answer» C. voltage across the inductor instantly reaches 63% of input voltage | |
| 429. |
Referring to the above figure, determine the voltage level that the output will reach during the pulse. |
| A. | 0 V |
| B. | 15 V |
| C. | 6.3 V |
| D. | 9.45 V |
| Answer» E. | |
| 430. |
An RC differentiator acts as a |
| A. | low-pass filter |
| B. | high-pass filter |
| C. | band-pass filter |
| D. | band-stop filter |
| Answer» C. band-pass filter | |
| 431. |
Referring this figure, on the falling edge, |
| A. | the resistor voltage drops to 5 V and then goes back to zero exponentially |
| B. | the resistor voltage jumps to 5 V and then goes back to zero exponentially |
| C. | the capacitor voltage remains constant |
| D. | the resistor voltage jumps to +5 V and then decreases exponentially to zero |
| Answer» C. the capacitor voltage remains constant | |
| 432. |
If a periodic pulse waveform has a pulse width and the time between pulses each equal to or greater than five time constants, the capacitor will |
| A. | partially charge and fully discharge during each period of the input waveform |
| B. | fully charge and partially discharge during each period of the input waveform |
| C. | fully charge and fully discharge during each period of the input waveform |
| D. | partially charge and partially discharge during each period of the input waveform |
| Answer» D. partially charge and partially discharge during each period of the input waveform | |
| 433. |
What is the highest frequency contained in a pulse that has a rise and fall time equal to 10 microseconds (10 s)? |
| A. | 35 kHz |
| B. | 3.5 kHz |
| C. | 10 kHz |
| D. | 100 kHz |
| Answer» B. 3.5 kHz | |
| 434. |
In electronic systems, repetitive-pulse waveforms are encountered |
| A. | more often than single pulses |
| B. | less often than single pulses |
| C. | about as often as single pulses |
| D. | twice as often as single pulses |
| Answer» B. less often than single pulses | |
| 435. |
The output of an RC integrator is taken across the |
| A. | diode |
| B. | capacitor |
| C. | resistor |
| D. | source |
| Answer» C. resistor | |
| 436. |
In an RC differentiator, responding to repetitive pulses, the average value of the output |
| A. | is zero |
| B. | is equal to the input voltage |
| C. | is 63 percent of the input voltage |
| D. | cannot be determined |
| Answer» B. is equal to the input voltage | |
| 437. |
If the RC time constant of an integrator is increased, as the time constant is increased |
| A. | the capacitor charges more during a pulse and discharges less between pulses |
| B. | the capacitor charges less during a pulse and discharges more between pulses |
| C. | the capacitor charges more during a pulse and discharges more between pulses |
| D. | the capacitor charges less during a pulse and discharges less between pulses |
| Answer» E. | |
| 438. |
In an RC differentiator, the sum of the capacitor voltage and the resistor voltage at any instant |
| A. | must be zero |
| B. | must be equal to the applied voltage |
| C. | is less than the applied voltage but greater than zero |
| D. | cannot be determined |
| Answer» C. is less than the applied voltage but greater than zero | |
| 439. |
When a 24 V input pulse with a width equal to five time constants is applied to an RC integrator, the capacitor charges to |
| A. | 24 V |
| B. | 15.12 V |
| C. | 20.64 V |
| D. | 12 V |
| Answer» B. 15.12 V | |
| 440. |
Find the current through R1 in the given circuit. |
| A. | 0.16 A |
| B. | 0.24 A |
| C. | 0.2 A |
| D. | 0.04 A |
| Answer» B. 0.24 A | |
| 441. |
A 120 V voltage source has a source resistance, RS, of 60 . The equivalent current source is |
| A. | 2 A |
| B. | 4 A |
| C. | 200 mA |
| D. | 400 mA |
| Answer» B. 4 A | |
| 442. |
A 12 V source has an internal resistance of 90 . If a load resistance of 20 is connected to the voltage source, the load power, PL, is |
| A. | 2.38 mW |
| B. | 2.38 W |
| C. | 238 mW |
| D. | 23.8 W |
| Answer» D. 23.8 W | |
| 443. |
In a two-source circuit, one source acting alone produces 12 mA through a given branch. The other source acting alone produces 10 mA in the opposite direction through the same branch. The actual current through the branch is |
| A. | 22 mA |
| B. | 12 mA |
| C. | 10 mA |
| D. | 2 mA |
| Answer» E. | |
| 444. |
Determine IN for the circuit consisting of VS, R1, R2, and R3 shown in the given circuit. |
| A. | 676 mA |
| B. | 245 mA |
| C. | 431 mA |
| D. | 75 mA |
| Answer» C. 431 mA | |
| 445. |
Electromagnetic induction is the force that produces a magnetic field. |
| A. | True |
| B. | False |
| Answer» C. | |
| 446. |
The tesla is the unit of magnetic flux. |
| A. | True |
| B. | False |
| Answer» C. | |
| 447. |
Ampere-turn is the unit of magnetomotive force (mmf). |
| A. | True |
| B. | False |
| Answer» B. False | |
| 448. |
A relay is an electromagnetically controlled mechanical device in which electrical contacts are opened or closed by a magnetizing current. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 449. |
Reluctance in a magnetic circuit is analogous to current in an electrical circuit. |
| A. | True |
| B. | False |
| Answer» C. | |
| 450. |
An ideal voltage source has zero internal resistance. |
| A. | True |
| B. | False |
| Answer» B. False | |