MCQOPTIONS
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MCQOPTIONS
This section includes 682 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 551. |
Find the range of band gap energy for conductors. |
| A. | >6 ev |
| B. | 0.2-0.4 ev |
| C. | 0.4-2 ev |
| D. | 2-6 ev |
| Answer» C. 0.4-2 ev | |
| 552. |
Find the band gap energy when a light of wavelength 1240nm is incident on it. |
| A. | 1ev |
| B. | 2ev |
| C. | 3ev |
| D. | 4ev |
| Answer» B. 2ev | |
| 553. |
Conduction in metals is due to |
| A. | electrons only |
| B. | electrons and holes |
| C. | holes only |
| D. | applied electric field |
| Answer» B. electrons and holes | |
| 554. |
Which of the following are conductors? |
| A. | ceramics |
| B. | plastics |
| C. | mercury |
| D. | rubber |
| Answer» D. rubber | |
| 555. |
When the electric field becomes zero, which of the following relations hold good? |
| A. | e = p |
| B. | d = p |
| C. | b = p |
| D. | h = p |
| Answer» C. b = p | |
| 556. |
The susceptibility of free space is |
| A. | 1 |
| B. | 0 |
| C. | 2 |
| D. | ∞ |
| Answer» C. 2 | |
| 557. |
Find the susceptibility of a material whose dielectric constant is 2.26. |
| A. | 1.26 |
| B. | 3.26 |
| C. | 5.1 |
| D. | 1 |
| Answer» B. 3.26 | |
| 558. |
Insulators perform which of the following functions? |
| A. | conduction |
| B. | convection |
| C. | provide electrical insulation |
| D. | allows current leakage at interfaces |
| Answer» D. allows current leakage at interfaces | |
| 559. |
Dielectric constant will be high in |
| A. | conductors |
| B. | semiconductors |
| C. | insulators |
| D. | superconductors |
| Answer» D. superconductors | |
| 560. |
The permittivity is also called |
| A. | electrostatic energy |
| B. | dielectric constant |
| C. | dipole moment |
| D. | susceptibility |
| Answer» C. dipole moment | |
| 561. |
The scalar factor of spherical coordinates is |
| A. | 1, r, r sin θ |
| B. | 1, r, r |
| C. | r, r, 1 |
| D. | r, 1, r |
| Answer» B. 1, r, r | |
| 562. |
The area of sphere can be computed from the sphere volume. State True/False. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 563. |
Given B= (10/r)i+( rcos θ) j+k in spherical coordinates. Find Cartesian points at (-3,4,0) |
| A. | -2i + j |
| B. | 2i + k |
| C. | i + 2j |
| D. | –i – 2k |
| Answer» B. 2i + k | |
| 564. |
Find the Cartesian coordinates of B(4,25â°,120â°) |
| A. | (0.845, 1.462, 3.625) |
| B. | (-0.845, 1.462, 3.625) |
| C. | (-8.45, 2.462, 6.325) |
| D. | (8.45, 2.462, 6.325) |
| Answer» C. (-8.45, 2.462, 6.325) | |
| 565. |
Find the spherical coordinates of A(2,3,-1) |
| A. | (3.74, 105.5â°, 56.13â°) |
| B. | (3.74, 105.5â°, 56.31â°) |
| C. | (3.74, 106.5â°, 56.13â°) |
| D. | (3.74, 106.5â°, 56.31â°) |
| Answer» C. (3.74, 106.5â°, 56.13â°) | |
| 566. |
Choose which of following condition is not required for a waveguide to exist. |
| A. | the dimensions should be in accordance with desired frequency |
| B. | cut-off frequency should be minimum 6ghz |
| C. | the shape should be spherical |
| D. | no specific condition is required for waveguide design |
| Answer» D. no specific condition is required for waveguide design | |
| 567. |
Example of spherical system in the following is |
| A. | charge in space |
| B. | charge in box |
| C. | charge in dielectric |
| D. | uncharged system |
| Answer» B. charge in box | |
| 568. |
Spherical systems are employed in waveguides. State True/False |
| A. | true |
| B. | false |
| Answer» C. | |
| 569. |
Rectangular waveguides dominate the circular waveguides. Find the reason. |
| A. | low cut-off frequency |
| B. | easy to design |
| C. | more wave propagation |
| D. | the statement is false |
| Answer» C. more wave propagation | |
| 570. |
Convert the point (3,4,5) from Cartesian to spherical coordinates |
| A. | (7.07,45â°,53â°) |
| B. | (0.707,45â°,53â°) |
| C. | (7.07,54â°,63â°) |
| D. | (0.707,54â°,63â°) |
| Answer» B. (0.707,45â°,53â°) | |
| 571. |
Charges filled inside a cylindrical will possess flux in which direction? |
| A. | upwards |
| B. | downwards |
| C. | laterally outwards |
| D. | inwards |
| Answer» D. inwards | |
| 572. |
The pressure inside a piston cylinder is a variable of |
| A. | radius |
| B. | plane angle |
| C. | z plane distance |
| D. | constant, not a variable |
| Answer» D. constant, not a variable | |
| 573. |
Cylindrical system is employed in waveguides. State True/False. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 574. |
A charge located at point p (5,30â°,2) is said to be in which coordinate system? |
| A. | cartesian system |
| B. | cylindrical system |
| C. | spherical system |
| D. | space system |
| Answer» C. spherical system | |
| 575. |
Cylindrical systems have the following scalar values respectively |
| A. | 1, Ï ,1 |
| B. | 1, 1, 1 |
| C. | 0,1,0 |
| D. | 1,0,0 |
| Answer» B. 1, 1, 1 | |
| 576. |
Transform the vector B=yi+(x+z)j located at point (-2,6,3) into cylindrical coordinates. |
| A. | (6.325,-71.57,3) |
| B. | (6.325,71.57,3) |
| C. | (6.325,73.57,3) |
| D. | (6.325,-73.57,3) |
| Answer» B. (6.325,71.57,3) | |
| 577. |
The cylindrical coordinate system is also referred to as |
| A. | cartesian system |
| B. | circular system |
| C. | spherical system |
| D. | space system |
| Answer» C. spherical system | |
| 578. |
Which of the following criteria is used to choose a coordinate system? |
| A. | distance |
| B. | intensity |
| C. | magnitude |
| D. | geometry |
| Answer» E. | |
| 579. |
The spherical equivalent of the vector B = yi + (x + z)j located at (-2,6,3) is given by |
| A. | (7,64.62,71.57) |
| B. | (7,-64.62,-71.57) |
| C. | (7,-64.62,71.57) |
| D. | (7,64.62,-71.57) |
| Answer» E. | |
| 580. |
The volume of a parallelepiped in Cartesian is |
| A. | dv = dx dy dz |
| B. | dv = dx dy |
| C. | dv = dy dz |
| D. | dv = dx dz |
| Answer» B. dv = dx dy | |
| 581. |
The scalar factor of Cartesian system is unity. State True/False. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 582. |
The Cartesian system is also called as |
| A. | circular coordinate system |
| B. | rectangular coordinate system |
| C. | spherical coordinate system |
| D. | space coordinate system |
| Answer» C. spherical coordinate system | |
| 583. |
When a vector is irrotational, which condition holds good? |
| A. | stoke’s theorem gives non-zero value |
| B. | stoke’s theorem gives zero value |
| C. | divergence theorem is invalid |
| D. | divergence theorem is valid |
| Answer» C. divergence theorem is invalid | |
| 584. |
A field has zero divergence and it has curls. The field is said to be |
| A. | divergent, rotational |
| B. | solenoidal, rotational |
| C. | solenoidal, irrotational |
| D. | divergent, irrotational |
| Answer» C. solenoidal, irrotational | |
| 585. |
The magnetic field intensity is said to be |
| A. | divergent |
| B. | curl free |
| C. | solenoidal |
| D. | rotational |
| Answer» D. rotational | |
| 586. |
A vector is said to be solenoidal when its |
| A. | divergence is zero |
| B. | divergence is unity |
| C. | curl is zero |
| D. | curl is unity |
| Answer» B. divergence is unity | |
| 587. |
Identify the correct vector identity. |
| A. | i . i = j . j = k . k = 0 |
| B. | i x j = j x k = k x i = 1 |
| C. | div (u x v) = v . curl(u) – u . curl(v) |
| D. | i . j = j . k = k . i = 1 |
| Answer» D. i . j = j . k = k . i = 1 | |
| 588. |
The curl of gradient of a vector is non-zero. State True or False. |
| A. | true |
| B. | false |
| Answer» C. | |
| 589. |
The divergence of curl of a vector is zero. State True or False. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 590. |
The Laplacian operator is actually |
| A. | grad(div v) |
| B. | div(grad v) |
| C. | curl(div v) |
| D. | div(curl v) |
| Answer» C. curl(div v) | |
| 591. |
The relation between vector potential and field strength is given by |
| A. | gradient |
| B. | divergence |
| C. | curl |
| D. | del operator |
| Answer» B. divergence | |
| 592. |
The del operator is called as |
| A. | gradient |
| B. | curl |
| C. | divergence |
| D. | vector differential operator |
| Answer» E. | |
| 593. |
Find the projection of A on B. Given A = 10j + 3k and B = 4j + 5k. |
| A. | 6 |
| B. | 6.25 |
| C. | 6.5 |
| D. | 6.75 |
| Answer» C. 6.5 | |
| 594. |
Distance and position vectors rely on field strength. State True/False. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 595. |
The distance vector can be used to compute which of the following? |
| A. | dot product |
| B. | cross product |
| C. | unit normal vector |
| D. | area |
| Answer» D. area | |
| 596. |
The work-electric field relation is given by |
| A. | volume integral |
| B. | surface integral |
| C. | line integral |
| D. | relation impossible |
| Answer» D. relation impossible | |
| 597. |
The polar form of Cartesian coordinates is |
| A. | circular coordinates |
| B. | spherical coordinates |
| C. | cartesian coordinates |
| D. | space coordinates |
| Answer» B. spherical coordinates | |
| 598. |
Find a vector normal to a plane consisting of points p1(0,1,0), p2(1,0,1) and p3(0,0,1) |
| A. | –j – k |
| B. | –i – j |
| C. | –i – k |
| D. | –i – j – k |
| Answer» B. –i – j | |
| 599. |
The unit vector to the points p1(0,1,0), p2(1,0,1), p3(0,0,1) is |
| A. | (-j – k)/1.414 |
| B. | (-i – k)/1.414 |
| C. | (-i – j)/1.414 |
| D. | (-i – j – k)/1.414 |
| Answer» B. (-i – k)/1.414 | |
| 600. |
The distance vector is obtained in |
| A. | cartesian coordinate system |
| B. | spherical coordinate system |
| C. | circular coordinate system |
| D. | space coordinate system |
| Answer» E. | |