MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Antenna Array knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following is the necessary condition to avoid grating lobes in N-Isotropic element end-fire array? |
| A. | d < /2 |
| B. | d < |
| C. | d > /2 |
| D. | d= |
| Answer» B. d < | |
| 2. |
Which of the following is the necessary condition to avoid grating lobes in N-Isotropic element broadside array? |
| A. | d < |
| B. | d > |
| C. | d= |
| D. | d < 2 |
| Answer» B. d > | |
| 3. |
Which of the following is the necessary condition to avoid grating lobes in N-Isotropic element array? |
| A. | ( frac{d}{ } frac{1}{1+|cos _m |} ) |
| B. | ( frac{d}{ } frac{1}{1+|cos _m |} ) |
| C. | ( frac{ }{d} frac{1}{1+|cos _m |} ) |
| D. | ( frac{ }{d}= frac{1}{1+|cos _m |} ) |
| Answer» B. ( frac{d}{ } frac{1}{1+|cos _m |} ) | |
| 4. |
The Half-power beam width of the N-element isotropic source array can be known when _____ |
| A. | ( = frac{2.782}{N} ) |
| B. | ( = frac{1.391}{N} ) |
| C. | ( = frac{1.414}{N} ) |
| D. | ( = frac{3}{N} ) |
| Answer» B. ( = frac{1.391}{N} ) | |
| 5. |
The necessary condition for the direction of maximum second side lobe level of the 4-element isotropic array is _______ |
| A. | ( frac{5}{4} ) |
| B. | ( frac{3}{4} ) |
| C. | ( frac{1}{8} ) |
| D. | ( frac{5}{8} ) |
| Answer» B. ( frac{3}{4} ) | |
| 6. |
The necessary condition for the direction of maximum first side lobe level of the 8-element isotropic array is _______ |
| A. | ( frac{3}{8} ) |
| B. | ( frac{3}{4} ) |
| C. | ( frac{1}{8} ) |
| D. | ( frac{5}{8} ) |
| Answer» B. ( frac{3}{4} ) | |
| 7. |
The necessary condition for the direction of maximum side lobe level of the N-element isotropic array is _______ |
| A. | ( = frac{2s+1}{N} ) |
| B. | ( = frac{2s+2}{N} ) |
| C. | ( = frac{2s}{N} ) |
| D. | ( = frac{2(s+1)}{N} ) |
| Answer» B. ( = frac{2s+2}{N} ) | |
| 8. |
The direction of nulls for end-fire array of N Isotropic sources separated by /4 is given by ____ |
| A. | ( _n=cos^{-1} u2061([ 1 frac{4n}{N}]) ) |
| B. | ( _n=sin^{-1} u2061([ 1 frac{4n}{N}]) ) |
| C. | ( _n=cos^{-1} u2061([ 1 frac{2n}{N}]) ) |
| D. | ( _n=cos^{-1} u2061([ 1 frac{n}{N}]) ) |
| Answer» B. ( _n=sin^{-1} u2061([ 1 frac{4n}{N}]) ) | |
| 9. |
The direction of first null of the broadside array of N-Isotropic sources is _____ |
| A. | (cos^{-1}([ frac{ }{Nd}]) ) |
| B. | (cos^{-1} u2061([ frac{ }{Nd}]) ) |
| C. | (cos^{-1} u2061([ frac{2 }{Nd}]) ) |
| D. | (cos^{-1} u2061([ frac{ }{2Nd}]) ) |
| Answer» B. (cos^{-1} u2061([ frac{ }{Nd}]) ) | |
| 10. |
The direction of nulls for broadside array of N Isotropic sources is given by _____ |
| A. | (cos^{-1} u2061([ frac{n }{Nd}]) ) |
| B. | (cos^{-1} u2061([ frac{2n }{Nd}]) ) |
| C. | (cos^{-1} u2061([ frac{2 n }{2Nd}]) ) |
| D. | (cos^{-1} u2061([ frac{n }{Nd}]) ) |
| Answer» B. (cos^{-1} u2061([ frac{2n }{Nd}]) ) | |