McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .
| 451. |
The characteristic impedance of a transmission line with impedance and admittance of 16 and 9 respectively is |
| A. | 25 |
| B. | 1.33 |
| C. | 7 |
| D. | 0.75 |
| Answer» B. 1.33 | |
| 452. |
Find the characteristic impedance expression in terms of the inductance and capacitance parameters. |
| A. | zo = √(lc) |
| B. | zo = lc |
| C. | zo = √(l/c) |
| D. | zo = l/c |
| Answer» C. zo = √(l/c) | |
| 453. |
When a transmission line has a load impedance same as that of the characteristic impedance, the line is said to be |
| A. | parallel |
| B. | perpendicular |
| C. | polarized |
| D. | matched |
| Answer» D. matched | |
| 454. |
The wavelength of a line with a phase constant of 6.28 units is |
| A. | 2 |
| B. | 1 |
| C. | 0.5 |
| D. | 3.14 |
| Answer» B. 1 | |
| 455. |
The wavelength of a wave with a frequency of 6 GHz in air is |
| A. | 50 |
| B. | 5 |
| C. | 0.5 |
| D. | 0.05 |
| Answer» D. 0.05 | |
| 456. |
The phase constant of a wave with a wavelength of 2 units is given by |
| A. | 2 |
| B. | 3.14 |
| C. | 6.28 |
| D. | 1 |
| Answer» B. 3.14 | |
| 457. |
The frequency of a wave travelling in a transmission line with velocity 4 x 108 and wavelength 3 units is |
| A. | 0.75 ghz |
| B. | 0.133 ghz |
| C. | 7.5 ghz |
| D. | 1.33 ghz |
| Answer» B. 0.133 ghz | |
| 458. |
The velocity and phase constant relation is given by |
| A. | v = ω/β |
| B. | v = ωβ |
| C. | v = β/ω |
| D. | vωβ = 1 |
| Answer» A. v = ω/β | |
| 459. |
The electrical length in a transmission line refers to the |
| A. | product of attenuation constant and length |
| B. | ratio of attenuation constant and length |
| C. | product of phase constant and length |
| D. | ratio of phase constant and length |
| Answer» A. product of attenuation constant and length | |
| 460. |
The unit of attenuation constant is |
| A. | decibel |
| B. | bel |
| C. | neper |
| D. | no unit |
| Answer» C. neper | |
| 461. |
The propagation constant of a wave with attenuation and phase constant given by 2 and 3 respectively is |
| A. | 2 – 3j |
| B. | 3 – 2j |
| C. | 2 + 3j |
| D. | 3 + 2j |
| Answer» C. 2 + 3j | |
| 462. |
The velocity of wave in the air medium is |
| A. | 1 x 108 |
| B. | 1.5 x 108 |
| C. | 3 x 108 |
| D. | 1 x 109 |
| Answer» C. 3 x 108 | |
| 463. |
Identify the secondary parameter from the options given below. |
| A. | resistance |
| B. | conductance |
| C. | phase constant |
| D. | capacitance |
| Answer» C. phase constant | |
| 464. |
Which of the following parameters does not exist in the transmission line equation? |
| A. | r |
| B. | zo |
| C. | zl |
| D. | propagation constant |
| Answer» A. r | |
| 465. |
For an infinite transmission line, the characteristic impedance is given by 50 ohm. Find the input impedance. |
| A. | 25 |
| B. | 100 |
| C. | 2500 |
| D. | 50 |
| Answer» D. 50 | |
| 466. |
The best transmission length for effective transmission of power is |
| A. | l = λ/4 |
| B. | l = λ/8 |
| C. | l = λ/2 |
| D. | l = ∞ |
| Answer» B. l = λ/8 | |
| 467. |
When the length of the transmission line is same as that of the wavelength, then which condition holds good? |
| A. | zin = zo |
| B. | z = zo |
| C. | zl = zo |
| D. | zin = zl |
| Answer» D. zin = zl | |
| 468. |
The input impedance of a half wave transmission line with a load impedance of 12.5 ohm is |
| A. | 25 |
| B. | 50 |
| C. | 6.25 |
| D. | 12.5 |
| Answer» D. 12.5 | |
| 469. |
The condition for a quarter wave transformer is |
| A. | zo2 = zin zl |
| B. | zo = zin zl |
| C. | zl2 = zin zo |
| D. | zo = zin |
| Answer» A. zo2 = zin zl | |
| 470. |
Find the characteristic impedance of a quarter wave with input and load impedances given by 50 and 25 respectively. |
| A. | 50 |
| B. | 25 |
| C. | 75 |
| D. | 35.35 |
| Answer» D. 35.35 | |
| 471. |
Find the load impedance in a quarter line transformer with characteristic impedance of 75 ohm and input impedance of 200 ohm. |
| A. | 28.125 |
| B. | 12.285 |
| C. | 52.185 |
| D. | 85.128 |
| Answer» A. 28.125 | |
| 472. |
The reflection coefficient of a perfectly matched transmission line is |
| A. | 1 |
| B. | -1 |
| C. | 0 |
| D. | ∞ |
| Answer» C. 0 | |
| 473. |
The purpose of the transmission line equation is to |
| A. | find primary parameters |
| B. | find secondary parameters |
| C. | find the reflection cofficient |
| D. | impedance matching |
| Answer» D. impedance matching | |
| 474. |
The quarter wave transformer can be considered as a |
| A. | impedance inverter |
| B. | impedance doubler |
| C. | impedance tripler |
| D. | impedance quadrupler |
| Answer» A. impedance inverter | |
| 475. |
Which transmission line is called as one to one transformer? |
| A. | l = λ |
| B. | l = λ/2 |
| C. | l = λ/4 |
| D. | l = λ/8 |
| Answer» B. l = λ/2 | |
| 476. |
The characteristic impedance of a quarter wave transformer with load and input impedances given by 30 and 75 respectively is |
| A. | 47.43 |
| B. | 37.34 |
| C. | 73.23 |
| D. | 67.45 |
| Answer» A. 47.43 | |
| 477. |
The input impedance of a quarter wave line 50 ohm and load impedance of 20 ohm is |
| A. | 50 |
| B. | 20 |
| C. | 1000 |
| D. | 125 |
| Answer» D. 125 | |
| 478. |
The reflection coefficient lies in the range of |
| A. | 0 < τ < 1 |
| B. | -1 < τ < 1 |
| C. | 1 < τ < ∞ |
| D. | 0 < τ < ∞ |
| Answer» A. 0 < τ < 1 | |
| 479. |
When the ratio of load voltage to input voltage is 5, the ratio of the characteristic impedance to the input impedance is |
| A. | 1/5 |
| B. | 5 |
| C. | 10 |
| D. | 25 |
| Answer» B. 5 | |
| 480. |
The reflection coefficient of a wave with transmission coefficient 0.35 is |
| A. | 1.35 |
| B. | 0.65 |
| C. | 0.35 |
| D. | 0.7 |
| Answer» B. 0.65 | |
| 481. |
The incident wave amplitude is 24 units. Find the reflected wave amplitude if the reflection coefficient is 0.6. |
| A. | 14.4 |
| B. | 16.6 |
| C. | 13.3 |
| D. | 11.1 |
| Answer» A. 14.4 | |
| 482. |
Find the reflection coefficient of the wave passing through two media having intrinsic impedances of 4 and 9 respectively. |
| A. | 0.5 |
| B. | 1 |
| C. | 0.38 |
| D. | 0.1 |
| Answer» C. 0.38 | |
| 483. |
The reflection coefficient of a wave travelling through two media having permittivities 4 and 9 respectively is |
| A. | 0 |
| B. | 0.5 |
| C. | 0.25 |
| D. | 0.2 |
| Answer» D. 0.2 | |
| 484. |
Calculate the transmission coefficient, when the incident and transmitted amplitudes are 10 and 7 respectively. |
| A. | 17 |
| B. | 3 |
| C. | 10/7 |
| D. | 0.7 |
| Answer» D. 0.7 | |
| 485. |
The transmission coefficient in a wave travelling through two media having intrinsic impedances of 5.5 and 1.33 is |
| A. | 0.389 |
| B. | 0.55 |
| C. | 0.133 |
| D. | 0.42 |
| Answer» A. 0.389 | |
| 486. |
The transmission coefficient in a wave travelling through two media having permittivities 4 and 1 is |
| A. | 1/4 |
| B. | 3/2 |
| C. | 3/4 |
| D. | 2/3 |
| Answer» D. 2/3 | |
| 487. |
The reflection coefficient of a transmission line having characteristic and load impedances as 50 and 30 ohm respectively is |
| A. | 1/4 |
| B. | 1/8 |
| C. | 1/2 |
| D. | 3/4 |
| Answer» A. 1/4 | |
| 488. |
In matched line, the transmission coefficient is |
| A. | 0 |
| B. | 1 |
| C. | -1 |
| D. | infinity |
| Answer» B. 1 | |
| 489. |
Standing waves occurs due to |
| A. | impedance match |
| B. | impedance mismatch |
| C. | reflection |
| D. | transmission |
| Answer» B. impedance mismatch | |
| 490. |
Standing wave ratio is defined as the |
| A. | ratio of voltage maxima to voltage minima |
| B. | ratio of current maxima to current minima |
| C. | product of voltage maxima and voltage minima |
| D. | product of current maxima and current minima |
| Answer» A. ratio of voltage maxima to voltage minima | |
| 491. |
Given that the reflection coefficient is 0.6. Find the SWR. |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» B. 4 | |
| 492. |
The maxima and minima voltage of the standing wave are 6 and 2 respectively. The standing wave ratio is |
| A. | 2 |
| B. | 3 |
| C. | 1/2 |
| D. | 4 |
| Answer» B. 3 | |
| 493. |
Find the standing wave ratio, when a load impedance of 250 ohm is connected to a 75 ohm line. |
| A. | 0.3 |
| B. | 75 |
| C. | 250 |
| D. | 3.33 |
| Answer» D. 3.33 | |
| 494. |
Find the reflection coefficient of the wave with SWR of 3.5. |
| A. | 0.55 |
| B. | 0.23 |
| C. | 0.48 |
| D. | 0.68 |
| Answer» A. 0.55 | |
| 495. |
The range of the standing wave ratio is |
| A. | 0 < s < 1 |
| B. | -1 < s < 1 |
| C. | 1 < s < ∞ |
| D. | 0 < s < ∞ |
| Answer» C. 1 < s < ∞ | |
| 496. |
For matched line, the standing wave ratio will be |
| A. | 0 |
| B. | ∞ |
| C. | -1 |
| D. | 1 |
| Answer» D. 1 | |
| 497. |
The maximum impedance of a 50 ohm transmission line with SWR of 3 is |
| A. | 50/3 |
| B. | 3/50 |
| C. | 150 |
| D. | 450 |
| Answer» C. 150 | |
| 498. |
The minimum impedance of a 75 ohm transmission line with a SWR of 2.5 is |
| A. | 100 |
| B. | 50 |
| C. | 25 |
| D. | 30 |
| Answer» D. 30 | |
| 499. |
The standing wave ratio of short circuited and open circuited lines will be |
| A. | 0 |
| B. | 1 |
| C. | -1 |
| D. | ∞ |
| Answer» D. ∞ | |
| 500. |
The current reflection coefficient of a line with voltage reflection coefficient of 0.65 is given by |
| A. | 0 |
| B. | 0.65 |
| C. | -0.65 |
| D. | 0.35 |
| Answer» C. -0.65 | |
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