1
GATE ECE 2022
MCQ (More than One Correct Answer)
+2
-0

A waveguide consists of two infinite parallel plates (perfect conductors) at a separation of 10$$-$$4 cm, with air as the dielectric. Assume the speed of light in air to be 3 $$\times$$ 108 m/s. The frequency/frequencies of TM waves which can propagate in this waveguide is/are ___________.

A
6 $$\times$$ 1015 Hz
B
0.5 $$\times$$ 1012 Hz
C
8 $$\times$$ 1014 Hz
D
1 $$\times$$ 1013 Hz
2
GATE ECE 2017 Set 2
MCQ (Single Correct Answer)
+2
-0.6
Standard air filled rectangular waveguides of dimensions a = 2.29cm and b = 1.02cm are designed for radar applications. It is desired that these waveguides operate only in the dominant $$T{E_{10}}$$ mode with the operating frequency at least 25% above the cut-off frequency of the $$T{E_{10}}$$ mode but not higher than 95% of the next higher cutoff frequency. The range of the allowable operating frequency f is
A
$$8.19\,\,GHz\,\, \le \,\,f\,\, \le \,\,13.1\,\,GHz$$
B
$$8.19\,\,GHz\,\, \le \,\,f\,\, \le \,\,12.45\,\,GHz$$
C
$$6.55\,\,GHz\,\, \le \,\,f\,\, \le \,\,13.1\,\,GHz$$
D
$$1.64\,\,GHz\,\, \le \,\,f\,\, \le \,\,10.24\,\,GHz$$
3
GATE ECE 2016 Set 3
Numerical
+2
-0
Consider an air-filled rectangular waveguide with dimensions a = 2.286cm and b = 1.016cm. At 10GHz operating frequency, the value of the propagation constant (per meter) of the corresponding propagation mode is _____________________
Your input ____
4
GATE ECE 2016 Set 3
MCQ (Single Correct Answer)
+2
-0.6
Consider an air-filled rectangular waveguide with dimensions a = 2.286 cm and b = 1.016 cm. The increasing order of the cut-off frequencies for different modes is
A
$$T{E_{01}}\,\, < \,T{E_{10}}\, < \,T{E_{11}}\,\, < \,T{E_{20}}$$
B
$$T{E_{20}}\,\, < \,T{E_{11}}\, < \,T{E_{10}}\,\, < \,T{E_{01}}$$
C
$$T{E_{10}}\,\, < \,T{E_{20}}\, < \,T{E_{01}}\,\, < \,T{E_{11}}$$
D
$$T{E_{10}}\,\, < \,T{E_{11}}\, < \,T{E_{20}}\,\, < \,T{E_{01}}$$
GATE ECE Subjects
EXAM MAP
Medical
NEETAIIMS
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
Staff Selection Commission
SSC CGL Tier I
CBSE
Class 12