McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .
| 501. |
The power of the electromagnetic wave with electric and magnetic field intensities given by 12 and 15 respectively is |
| A. | 180 |
| B. | 90 |
| C. | 45 |
| D. | 120 |
| Answer» B. 90 | |
| 502. |
The transmission coefficient is given by 0.65. Find the return loss of the wave. |
| A. | 9.11 |
| B. | 1.99 |
| C. | 1.19 |
| D. | 9.91 |
| Answer» A. 9.11 | |
| 503. |
The intrinsic impedance of a wave with electric and magnetic field of 10 and 8 respectively is |
| A. | 1.6 |
| B. | 1.11 |
| C. | 1.25 |
| D. | 0.8 |
| Answer» B. 1.11 | |
| 504. |
The intrinsic impedance in free space is |
| A. | 60π |
| B. | 12π |
| C. | 6π |
| D. | 120π |
| Answer» D. 120π | |
| 505. |
The skin effect is a phenomenon observed in |
| A. | insulators |
| B. | dielectrics |
| C. | conductors |
| D. | semiconductors |
| Answer» C. conductors | |
| 506. |
The skin depth is measured in |
| A. | meter |
| B. | millimetre |
| C. | centimetre |
| D. | micrometer |
| Answer» D. micrometer | |
| 507. |
The attenuation constant is 0.5 units. The skin depth will be |
| A. | 0.5 |
| B. | 0.25 |
| C. | 2 |
| D. | 4 |
| Answer» C. 2 | |
| 508. |
The relation between the skin depth and frequency is given by |
| A. | skin depth α f |
| B. | skin depth α 1/f |
| C. | skin depth α √f |
| D. | skin depth α 1/√f |
| Answer» D. skin depth α 1/√f | |
| 509. |
The skin depth of the wave having a frequency of 3MHz and a velocity of 12 m/s is |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 6 |
| Answer» C. 4 | |
| 510. |
The coaxial cable consists of |
| A. | conductors |
| B. | dielectric |
| C. | conductor with dielectric |
| D. | two conductors with dielectric |
| Answer» D. two conductors with dielectric | |
| 511. |
The transmission line is said to be lossless when the |
| A. | conductor is perfect and dielectric is lossless |
| B. | conductor is perfect and dielectric is lossy |
| C. | conductor is imperfect and dielectric is lossy |
| D. | conductor is imperfect and dielectric is lossless |
| Answer» A. conductor is perfect and dielectric is lossless | |
| 512. |
The resistance of a lossless transmission line is |
| A. | 0 |
| B. | 1 |
| C. | -1 |
| D. | infinity |
| Answer» A. 0 | |
| 513. |
The attenuation constant is measured in the units of |
| A. | ohm |
| B. | neper |
| C. | decibel |
| D. | radian/sec |
| Answer» B. neper | |
| 514. |
The condition that holds good in a distortionless transmission line is |
| A. | r/l = g/c |
| B. | rl = gc |
| C. | l/r = c/g |
| D. | rg/lc |
| Answer» A. r/l = g/c | |
| 515. |
Given that R = 20 ohm, L = 40 mH, C = 40 μF, G = 0.02 mho. Find whether the line is distortionless or not. |
| A. | distorted line |
| B. | distortionless line |
| C. | all of the mentioned |
| D. | none of the mentioned |
| Answer» B. distortionless line | |
| 516. |
For R= 20 ohm and G= 0.8 mho, the attenuation constant will be |
| A. | 16 |
| B. | 4 |
| C. | 2 |
| D. | 32 |
| Answer» A. 16 | |
| 517. |
The Smith chart is a polar chart which plots |
| A. | r vs z |
| B. | r vs znorm |
| C. | t vs z |
| D. | t vs znorm |
| Answer» B. r vs znorm | |
| 518. |
The Smith chart consists of the |
| A. | constant r and variable x circles |
| B. | variable r and constant x circles |
| C. | constant r and constant x circles |
| D. | variable r and variable x circles |
| Answer» C. constant r and constant x circles | |
| 519. |
The circles in the Smith chart pass through which point? |
| A. | (0,1) |
| B. | (0,-1) |
| C. | (-1,0) |
| D. | (1,0) |
| Answer» D. (1,0) | |
| 520. |
Moving towards the clockwise direction in the Smith chart implies moving |
| A. | towards generator |
| B. | towards load |
| C. | towards stub |
| D. | towards waveguide |
| Answer» A. towards generator | |
| 521. |
The centre of the point having a normalised resistance of 1.2 ohm and reactance of 1.5 ohm is |
| A. | (0.54,0) |
| B. | (0.45,0) |
| C. | (0.36,0) |
| D. | (0.78,0) |
| Answer» A. (0.54,0) | |
| 522. |
The normalised load impedance of the transmission line 50 ohm with a load of 30 ohm is |
| A. | 30 |
| B. | 150 |
| C. | 5/3 |
| D. | 3/5 |
| Answer» D. 3/5 | |
| 523. |
The radius of the point having a normalised resistance of 1 ohm is |
| A. | 1 |
| B. | 0.2 |
| C. | 0.5 |
| D. | 0.25 |
| Answer» C. 0.5 | |
| 524. |
The open circuit line will have a reflection coefficient of |
| A. | 0 |
| B. | 1 |
| C. | -1 |
| D. | ∞ |
| Answer» B. 1 | |
| 525. |
For time varying currents, the field or waves will be |
| A. | electrostatic |
| B. | magneto static |
| C. | electromagnetic |
| D. | electrical |
| Answer» C. electromagnetic | |
| 526. |
According to Faraday’s law, EMF stands for |
| A. | electromagnetic field |
| B. | electromagnetic force |
| C. | electromagnetic friction |
| D. | electromotive force |
| Answer» D. electromotive force | |
| 527. |
Find the displacement current when the flux density is given by t3 at 2 seconds. |
| A. | 3 |
| B. | 6 |
| C. | 12 |
| D. | 27 |
| Answer» C. 12 | |
| 528. |
Find the force due to a current element of length 2cm and flux density of 12 tesla. The current through the element will be 5A. |
| A. | 1 n |
| B. | 1.2 n |
| C. | 1.4 n |
| D. | 1.6 n |
| Answer» B. 1.2 n | |
| 529. |
When the conduction current density and displacement current density are same, the dissipation factor will be |
| A. | zero |
| B. | minimum |
| C. | maximum |
| D. | unity |
| Answer» D. unity | |
| 530. |
The divergence of which quantity will be zero? |
| A. | e |
| B. | d |
| C. | h |
| D. | b |
| Answer» D. b | |
| 531. |
Find the charge density when the electric flux density is given by 2x i + 3y j + 4z k. |
| A. | 10 |
| B. | 9 |
| C. | 24 |
| D. | 0 |
| Answer» B. 9 | |
| 532. |
Find the Maxwell equation derived from Faraday’s law. |
| A. | div(h) = j |
| B. | div(d) = i |
| C. | curl(e) = -db/dt |
| D. | curl(b) = -dh/dt |
| Answer» C. curl(e) = -db/dt | |
| 533. |
Find the Maxwell law derived from Ampere law. |
| A. | div(i) = h |
| B. | div(h) = j |
| C. | curl(h) = j |
| D. | curl(b) = d |
| Answer» C. curl(h) = j | |
| 534. |
In which of the following forms can Maxwell’s equation not be represented? |
| A. | static |
| B. | differential |
| C. | integral |
| D. | harmonic |
| Answer» A. static | |
| 535. |
The charge build up in the capacitor is due to which quantity? |
| A. | conduction current |
| B. | displacement current |
| C. | convection current |
| D. | direct current |
| Answer» B. displacement current | |
| 536. |
In metals which of the following equation will hold good? |
| A. | curl(h) = j |
| B. | curl(j) = dd/dt |
| C. | curl(h) = d |
| D. | curl(j) = db/dt |
| Answer» A. curl(h) = j | |
| 537. |
Find the flux enclosed by a material of flux density 12 units in an area of 80cm. |
| A. | 9.6 |
| B. | 12/80 |
| C. | 80/12 |
| D. | 12/0.8 |
| Answer» A. 9.6 | |
| 538. |
Find the electric flux density of a material with charge density 16 units in unit volume. |
| A. | 1/16 |
| B. | 16t |
| C. | 16 |
| D. | 162 |
| Answer» C. 16 | |
| 539. |
Find the conductivity of a material with conduction current density 100 units and electric field of 4 units. |
| A. | 25 |
| B. | 400 |
| C. | 0.04 |
| D. | 1600 |
| Answer» A. 25 | |
| 540. |
Calculate the displacement current density when the electric flux density is 20sin 0.5t. |
| A. | 10sin 0.5t |
| B. | 10cos 0.5t |
| C. | 20sin 2t |
| D. | 20cos 2t |
| Answer» B. 10cos 0.5t | |
| 541. |
The power of the electromagnetic wave with electric and magnetic field intensities given by 12 and 15 respectively is |
| A. | 180 |
| B. | 90 |
| C. | 45 |
| D. | 120 |
| Answer» B. 90 | |
| 542. |
The power of a wave of with voltage of 140V and a characteristic impedance of 50 ohm is |
| A. | 1.96 |
| B. | 19.6 |
| C. | 196 |
| D. | 19600 |
| Answer» C. 196 | |
| 543. |
The power reflected by a wave with incident power of 16 units is(Given that the reflection coefficient is 0.5) |
| A. | 2 |
| B. | 8 |
| C. | 6 |
| D. | 4 |
| Answer» D. 4 | |
| 544. |
The incident and the reflected voltage are given by 15 and 5 respectively. The transmission coefficient is |
| A. | 1/3 |
| B. | 2/3 |
| C. | 1 |
| D. | 3 |
| Answer» B. 2/3 | |
| 545. |
The current reflection coefficient is given by -0.75. Find the voltage reflection coefficient. |
| A. | -0.75 |
| B. | 0.25 |
| C. | -0.25 |
| D. | 0.75 |
| Answer» D. 0.75 | |
| 546. |
The attenuation is given by 20 units. Find the power loss in decibels. |
| A. | 13.01 |
| B. | 26.02 |
| C. | 52.04 |
| D. | 104.08 |
| Answer» A. 13.01 | |
| 547. |
The curl of the electric field intensity is |
| A. | conservative |
| B. | rotational |
| C. | divergent |
| D. | static |
| Answer» B. rotational | |
| 548. |
Which of the following identities is always zero for static fields? |
| A. | grad(curl v) |
| B. | curl(div v) |
| C. | div(grad v) |
| D. | curl(grad v) |
| Answer» D. curl(grad v) | |
| 549. |
Find the displacement current density of a material with flux density of 5sin t |
| A. | 2.5cos t |
| B. | 2.5sin t |
| C. | 5cos t |
| D. | 5sin t |
| Answer» C. 5cos t | |
| 550. |
Find the magnetic field intensity when the magnetic vector potential x i + 2y j + 3z k. |
| A. | 6 |
| B. | -6 |
| C. | 0 |
| D. | 1 |
| Answer» B. -6 | |
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