# Electronics and Communication Engineering - Exam Questions Papers - Discussion

Discussion Forum : Exam Questions Papers - Exam Paper 1 (Q.No. 4)
4.
A rectangular waveguide, in dominant TE mode, has dimensions 10 cm x 15 cm. The cut off frequency is
10 GHz
1 GHz
15 GHz
25 GHz
Explanation:

For TE10 mode

Discussion:
8 comments Page 1 of 1.

Thenmozhi said:   6 years ago
@Gopal.

What is "c" here?
(1)

NAVYA REKHA said:   6 years ago
@Gauri.

Here a is wider band& b is narrow band means a=15,b=10.
So,f=3*10^8 m/2*15 cm,
3*10^8/0.3=1ghz.

Rajesh said:   6 years ago
Dominant mode is TE10 only when dimensions are a>b but here in the question he gave a<b so dominant mode will be TE01 so Cut-off frequency is C/(2b).

Gauri said:   6 years ago
Yes, answer should be 1.5 GHz.
(1)

Gopal said:   8 years ago
@Alok.

For Dominant mode TE10.
Cutoff frequency f = c/2a.
Put all the value and we get our answer.

Santhosh said:   8 years ago
Please explain clearly. I can't understand.

Alok said:   9 years ago