MCQOPTIONS
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MCQOPTIONS
This section includes 77 Mcqs, each offering curated multiple-choice questions to sharpen your Analog Communications knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The frequency of local oscillator ________ |
| A. | can be either below or above the RF frequency |
| B. | is below the RF frequency |
| C. | is above the RF frequency |
| D. | is fixed typically at 450KHz |
| Answer» D. is fixed typically at 450KHz | |
| 52. |
A resonant circuit is a simple form of bandpass filter. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 53. |
Which two networks can be used for impedance matching? |
| A. | pi network and T network |
| B. | pi network and bridge network |
| C. | bridge network and T network |
| D. | pi network and omega network |
| Answer» B. pi network and bridge network | |
| 54. |
When aliasing will take place? |
| A. | Sampling signals less than Nyquist Rate |
| B. | Sampling signals more than Nyquist Rate |
| C. | Sampling signals equal to Nyquist Rate |
| D. | Sampling signals at a rate which is twice of Nyquist Rate |
| Answer» B. Sampling signals more than Nyquist Rate | |
| 55. |
Which statement is true about frequency multipliers? |
| A. | they are essentially balanced modulators |
| B. | they are essentially class C amplifiers |
| C. | they are essentially class AB amplifiers |
| D. | they are essentially mixers |
| Answer» C. they are essentially class AB amplifiers | |
| 56. |
How we limit the response of a receiver to a weak signal? |
| A. | by the AGC |
| B. | by the noise that is generated in the receiver |
| C. | by the dynamic range of the receiver |
| D. | by the type of detector circuit being used |
| Answer» C. by the dynamic range of the receiver | |
| 57. |
Which statement is true for low level amplitude modulation? |
| A. | all RF amplifiers are of class A |
| B. | all RF amplifiers can be linear |
| C. | minimum RF power is required |
| D. | maximum RF power is required |
| Answer» C. minimum RF power is required | |
| 58. |
Which statement is true for high level amplitude modulation? |
| A. | all RF amplifiers are of class A |
| B. | all RF amplifiers can be nonlinear |
| C. | minimum RF power is required |
| D. | maximum RF power is required |
| Answer» C. minimum RF power is required | |
| 59. |
In data transmission, character code only includes alphanumeric characters. |
| A. | True |
| B. | False |
| Answer» C. | |
| 60. |
What is the full form of POTS? |
| A. | Private Office Telephone System |
| B. | Public Office Telephone System |
| C. | Primary Office Telephone System |
| D. | Plain Old Telephone Service |
| Answer» E. | |
| 61. |
What is the use of ARQ? |
| A. | correct bit errors |
| B. | works with a simplex channel |
| C. | better transmission efficiency |
| D. | can only be used in unidirectional channel |
| Answer» B. works with a simplex channel | |
| 62. |
The term CD in CSMA/CD stands for _________ |
| A. | Collision Detection |
| B. | Collision Delay |
| C. | Compact Detection |
| D. | Compact Delay |
| Answer» B. Collision Delay | |
| 63. |
Dumb terminals are used in token-passing networks. |
| A. | True |
| B. | False |
| Answer» C. | |
| 64. |
In networks, long messages are divided into 'chunks' called __________ |
| A. | packets |
| B. | bits |
| C. | parts |
| D. | tokens |
| Answer» B. bits | |
| 65. |
An AM signal is represented by x(t) = (30 + 2Sin(700pt)) Cos(2pt x 10²t)V. What is the modulation index? |
| A. | 0.7 |
| B. | 0.066 |
| C. | 0.341 |
| D. | 0.916 |
| Answer» C. 0.341 | |
| 66. |
An AM signal is represented by x(t) = (30 + 2Sin(700pt)) Cos(2pt x 10²t)V. Carrier power of the wave is __________ |
| A. | 555W |
| B. | 675W |
| C. | 450W |
| D. | 310W |
| Answer» D. 310W | |
| 67. |
What is its sideband power in an AM signal is represented by x(t) = (30 + 2Sin(700pt)) Cos(2pt x 10²t)V. |
| A. | 4W |
| B. | 1W |
| C. | 3W |
| D. | 2W |
| Answer» C. 3W | |
| 68. |
An AM signal is represented by x(t) = (30 + 2Sin(700pt)) Cos(2pt x 10²t)V. Find the total power of amplitude modulated wave? |
| A. | 453W |
| B. | 675W |
| C. | 789W |
| D. | 451W |
| Answer» E. | |
| 69. |
When two or more PCs try to access a baseband network cable at the same time, it is called ________ |
| A. | contention |
| B. | collision |
| C. | excess traffic |
| D. | switching |
| Answer» B. collision | |
| 70. |
When two PCs send data over a baseband network cable at the same time, it is called ________ |
| A. | contention |
| B. | collision |
| C. | excess traffic |
| D. | switching |
| Answer» C. excess traffic | |
| 71. |
On which factor dominant mode of a waveguide depends? |
| A. | shape |
| B. | power |
| C. | direction |
| D. | bandwidth |
| Answer» B. power | |
| 72. |
The electric and magnetic field of a radio wave are perpendicular to each other. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 73. |
Which polarization is possible for an electromagnetic wave? |
| A. | vertical |
| B. | circular |
| C. | horizontal |
| D. | can be vertical or horizontal or circular |
| Answer» E. | |
| 74. |
Who invented the Ethernet? |
| A. | IBM |
| B. | Xerox |
| C. | Intel |
| D. | Cisco |
| Answer» C. Intel | |
| 75. |
MAN stands for ________ |
| A. | Metropolitan Access Network |
| B. | Metropolitan Area Network |
| C. | Multiple Area Network |
| D. | Multiple Access Network |
| Answer» C. Multiple Area Network | |
| 76. |
Striplines and microstrips are used to __________ |
| A. | couple sections of waveguide |
| B. | couple waveguides to antennas |
| C. | couple components on a circuit board |
| D. | couple electromagnetic waves in an order |
| Answer» D. couple electromagnetic waves in an order | |
| 77. |
What is the another term used for a single microwave link? |
| A. | section |
| B. | hop |
| C. | link |
| D. | skip |
| Answer» C. link | |