# GATE (Graduate Aptitude Test in Engineering) Electronics: Questions 859 - 861 of 1076

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## Question 859

Appeared in Year: *2016*

### Question

MCQ▾An antenna pointing in a certain direction has a noise temperature of . The ambient temperature is . The antenna is connected to a pre-amplifier that has a noise figure of and an available gain of over an effective bandwidth of 12 MHz. The effective input noise temperature for the amplifier and the noise power at the output of the preamplifier, respectively, are

### Choices

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

a. | ||

b. | ||

c. | ||

d. |

## Question 860

Appeared in Year: *2015*

### Question

MCQ▾A realization of a stable discrete time system is shown in figure. If the system is excited by a unit step sequence input , the response is …

### Choices

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

a. | ||

b. | ||

c. | ||

d. |

## Question 861

Appeared in Year: *2017*

### Question

MCQ▾A unity feedback control system is characterized by the open loop transfer function

The Nyquist path and the corresponding Nyquist plot of are shown in the figures below.

Nyquist Path for

Nyquist plot of G (s)

If , then number of poles of the closed loop transfer function that lie in the right half of the s-plane is

### Choices

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

a. | 0 | |

b. | ||

c. | 1 | |

d. | 3 |