# Electromagnetics [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 48 - 52 of 96

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## Question 48

### Question

MCQ▾For a rectangular waveguide of internal dimensions , the cut – off frequency for the mode is the arithmetic mean of the cut – off frequencies for mode and mode. If . the value of is … .

### Choices

Choice (4) | Response | |
---|---|---|

a. | 3 cm | |

b. | 4 cm | |

c. | 2 cm | |

d. | All of the above |

## Question 49

### Question

MCQ▾Consider an air – filled rectangular waveguide with dimensions and . At operating frequency, the value of the propagation constant (per meter) of the corresponding propagation mode is ________

### Choices

Choice (4) | Response | |
---|---|---|

a. | ||

b. | ||

c. | ||

d. | All of the above |

## Question 50

### Question

MCQ▾The magnetic field along the propagation direction inside a rectangular waveguide with the cross section shown in the figure is

The phase velocity of the wave inside the waveguide satisfies

### Choices

Choice (4) | Response | |
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a. | ||

b. | ||

c. | ||

d. |

## Question 51

### Question

MCQ▾A rectangular metal wave guide filled with a dielectric material of relative permittivity has the inside dimensions . The cut off frequency for the dominant mode is

### Choices

Choice (4) | Response | |
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a. | ||

b. | ||

c. | ||

d. |

## Question 52

### Question

MCQ▾Consider an air – filled rectangular waveguide with dimensions and . The increasing order of the cut – off frequency for different modes is

### Choices

Choice (4) | Response | |
---|---|---|

a. | ||

b. | ||

c. | ||

d. |