McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .
| 101. |
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» A. dv = dx dy dz | |
| 102. |
The scalar factor of Cartesian system is unity. State True/False. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 103. |
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» D. (7,64.62,-71.57) | |
| 104. |
Which of the following criteria is used to choose a coordinate system? |
| A. | distance |
| B. | intensity |
| C. | magnitude |
| D. | geometry |
| Answer» D. geometry | |
| 105. |
The cylindrical coordinate system is also referred to as |
| A. | cartesian system |
| B. | circular system |
| C. | spherical system |
| D. | space system |
| Answer» B. circular system | |
| 106. |
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» A. (6.325,-71.57,3) | |
| 107. |
Cylindrical systems have the following scalar values respectively |
| A. | 1, ρ ,1 |
| B. | 1, 1, 1 |
| C. | 0,1,0 |
| D. | 1,0,0 |
| Answer» A. 1, ρ ,1 | |
| 108. |
A charge located at point p (5,30⁰,2) is said to be in which coordinate system? |
| A. | cartesian system |
| B. | cylindrical system |
| C. | spherical system |
| D. | space system |
| Answer» B. cylindrical system | |
| 109. |
Cylindrical system is employed in waveguides. State True/False. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 110. |
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» C. z plane distance | |
| 111. |
Charges filled inside a cylindrical will possess flux in which direction? |
| A. | upwards |
| B. | downwards |
| C. | laterally outwards |
| D. | inwards |
| Answer» C. laterally outwards | |
| 112. |
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» B. easy to design | |
| 113. |
Convert the point (3,4,5) from Cartesian to spherical coordinates |
| A. | (7.07,45⁰,53⁰) |
| B. | (0.707,45⁰,53⁰) |
| C. | (7.07,54⁰,63⁰) |
| D. | (0.707,54⁰,63⁰) |
| Answer» A. (7.07,45⁰,53⁰) | |
| 114. |
Example of spherical system in the following is |
| A. | charge in space |
| B. | charge in box |
| C. | charge in dielectric |
| D. | uncharged system |
| Answer» A. charge in space | |
| 115. |
Spherical systems are employed in waveguides. State True/False |
| A. | true |
| B. | false |
| Answer» B. false | |
| 116. |
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» C. the shape should be spherical | |
| 117. |
Find the spherical coordinates of A(2,3,-1) |
| A. | (3.74, 105.5⁰, 56.13⁰) |
| B. | (3.74, 105.5⁰, 56.31⁰) |
| C. | (3.74, 106.5⁰, 56.13⁰) |
| D. | (3.74, 106.5⁰, 56.31⁰) |
| Answer» B. (3.74, 105.5⁰, 56.31⁰) | |
| 118. |
Find the Cartesian coordinates of B(4,25⁰,120⁰) |
| 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» B. (-0.845, 1.462, 3.625) | |
| 119. |
The area of sphere can be computed from the sphere volume. State True/False. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 120. |
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» A. -2i + j | |
| 121. |
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» A. 1, r, r sin θ | |
| 122. |
The permittivity is also called |
| A. | electrostatic energy |
| B. | dielectric constant |
| C. | dipole moment |
| D. | susceptibility |
| Answer» B. dielectric constant | |
| 123. |
Dielectric constant will be high in |
| A. | conductors |
| B. | semiconductors |
| C. | insulators |
| D. | superconductors |
| Answer» C. insulators | |
| 124. |
Insulators perform which of the following functions? |
| A. | conduction |
| B. | convection |
| C. | provide electrical insulation |
| D. | allows current leakage at interfaces |
| Answer» C. provide electrical insulation | |
| 125. |
Find the susceptibility of a material whose dielectric constant is 2.26. |
| A. | 1.26 |
| B. | 3.26 |
| C. | 5.1 |
| D. | 1 |
| Answer» A. 1.26 | |
| 126. |
The susceptibility of free space is |
| A. | 1 |
| B. | 0 |
| C. | 2 |
| D. | ∞ |
| Answer» B. 0 | |
| 127. |
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» B. d = p | |
| 128. |
Which of the following are conductors? |
| A. | ceramics |
| B. | plastics |
| C. | mercury |
| D. | rubber |
| Answer» C. mercury | |
| 129. |
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» B. 0.2-0.4 ev | |
| 130. |
Conduction in metals is due to |
| A. | electrons only |
| B. | electrons and holes |
| C. | holes only |
| D. | applied electric field |
| Answer» A. electrons only | |
| 131. |
Find the band gap energy when a light of wavelength 1240nm is incident on it. |
| A. | 1ev |
| B. | 2ev |
| C. | 3ev |
| D. | 4ev |
| Answer» A. 1ev | |
| 132. |
Alternating current measured in a transmission line will be |
| A. | peak value |
| B. | average value |
| C. | rms value |
| D. | zero |
| Answer» C. rms value | |
| 133. |
The current in a metal at any frequency is due to |
| A. | conduction current |
| B. | displacement current |
| C. | both conduction and displacement current |
| D. | neither conduction nor displacement current |
| Answer» A. conduction current | |
| 134. |
For conductors, the free electrons will exist at |
| A. | valence band |
| B. | middle of valence and conduction band |
| C. | will not exist |
| D. | conduction band |
| Answer» D. conduction band | |
| 135. |
The current flowing through an insulating medium is called |
| A. | conduction |
| B. | convection |
| C. | radiation |
| D. | susceptibility |
| Answer» B. convection | |
| 136. |
Identify a good dielectric. |
| A. | iron |
| B. | ceramics |
| C. | plastic |
| D. | magnesium |
| Answer» B. ceramics | |
| 137. |
A dielectric can be made a conductor by |
| A. | compression |
| B. | heating |
| C. | doping |
| D. | freezing |
| Answer» B. heating | |
| 138. |
Find the dielectric constant for a material with electric susceptibility of 4. |
| A. | 3 |
| B. | 5 |
| C. | 8 |
| D. | 16 |
| Answer» B. 5 | |
| 139. |
For a dielectric which of the following properties hold good? |
| A. | they are superconductors at high temperatures |
| B. | they are superconductors at low temperatures |
| C. | they can never become a superconductor |
| D. | they have very less dielectric breakdown voltage |
| Answer» B. they are superconductors at low temperatures | |
| 140. |
he magnetic field which destroys the superconductivity is called |
| A. | diamagnetic field |
| B. | ferromagnetic field |
| C. | ferrimagnetic field |
| D. | critical field |
| Answer» D. critical field | |
| 141. |
The magnetic susceptibility in a superconductor will be |
| A. | positive |
| B. | negative |
| C. | zero |
| D. | infinity |
| Answer» B. negative | |
| 142. |
The superconducting materials will be independent of which of the following? |
| A. | magnetic field |
| B. | electric field |
| C. | magnetization |
| D. | temperature |
| Answer» B. electric field | |
| 143. |
Find the mean free path of an electron travelling at a speed of 18m/s in 2 seconds. |
| A. | 9 |
| B. | 36 |
| C. | 0.11 |
| D. | 4.5 |
| Answer» B. 36 | |
| 144. |
The best definition of polarisation is |
| A. | orientation of dipoles in random direction |
| B. | electric dipole moment per unit volume |
| C. | orientation of dipole moments |
| D. | change in polarity of every dipole |
| Answer» B. electric dipole moment per unit volume | |
| 145. |
Polarizability is defined as the |
| A. | product of dipole moment and electric field |
| B. | ratio of dipole moment to electric field |
| C. | ratio of electric field to dipole moment |
| D. | product of dielectric constant and dipole moment |
| Answer» B. ratio of dipole moment to electric field | |
| 146. |
Identify which type of polarisation depends on temperature. |
| A. | electronic |
| B. | ionic |
| C. | orientational |
| D. | interfacial |
| Answer» C. orientational | |
| 147. |
The total polarisation of a material is the |
| A. | product of all types of polarisation |
| B. | sum of all types of polarisation |
| C. | orientation directions of the dipoles |
| D. | total dipole moments in the material |
| Answer» B. sum of all types of polarisation | |
| 148. |
In the given types of polarisation, which type exists in the semiconductor? |
| A. | electronic |
| B. | ionic |
| C. | orientational |
| D. | interfacial or space charge |
| Answer» D. interfacial or space charge | |
| 149. |
Solids do not have which type of polarisation? |
| A. | ionic |
| B. | orientational |
| C. | interfacial |
| D. | electronic |
| Answer» C. interfacial | |
| 150. |
Which of the following is not an example of elemental solid dielectric? |
| A. | diamond |
| B. | sulphur |
| C. | silicon |
| D. | germanium |
| Answer» C. silicon | |
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