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Consider the following statements regarding modulation : 1. The communication systems, where a weak signal is transmitted by the use of a modulation is essential in carrier signal. 2. When the frequency of the high frequency signal is varied in accordance with the intensity of the low-frequency weak signal, the modulation is said to be frequency modulation. 3. The process of recovering original baseband signal from the modulated signal is called phase modulation. Which of the above statements are correct ? 
Consider the following types of modulation: 1. Amplitude modulation 2. Frequency modulation 3. Phase modulation 4. Pulse modulation Which of the above modulation are used for telecasting TV programs?
Consider the following solution to the producer-consumer synchronization problem. The shared buffer size is ?. Three semaphores empty, full and mutex are defined with respective initial values of 0, ? and 1. Semaphore empty denotes the number of available slots in the buffer, for the consumer to read from. Semaphore denotes the number of available slots in the buffer, for the producer to write to. The placeholder variables, denoted by P, Q, R, and S, in the code below can be assigned either empty or full. The valid semaphore operations are: wait ( ) and signal ( ). Producer: Consumer: do {         wait (P) ;         wait (mutex) ;         //Add item to buffer         signal (mutex) ;         signal (Q) ; } while (1) ; do {          wait (R) ;          wait (mutex) ;          //Consume item from buffer          signal (mutex) ;          signal (S) ; } while (1) ;   Which one of the following assignments to P, Q, R and S will yield the correct solution?
A rectangular pulse train s(t) as shown in the figure is convolved with the signal cos2(4π × 103t). The convolved signal will be a
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Consider the following: 1. Pulse-position modulation. 2. Pulse-code modulation. 3. Pulse-width modulation. Which of the above communications are not digital?
What is the meaning of the term "Humanist" used during the Renaissance in 15th century Europe? 1. It refers to the masters who taught grammar and rhetoric 2. It refers to the masters who taught poetry, history and moral philosophy  3. It refers to the masters who taught subjects that were connected with religion 4. It refers to masters who emphasized skills that were developed through discussion and debate. Select the correct answer using the code give below:
Consider the following statements in respect of effect of air pollutants on vegetation: 1. Necrosis refers to killing of tissue 2. Chlorosis refers to loss or reduction of green plant pigment 3. Leaf abscission refers to the dropping of leaves 4. Leaf epinasty refers to a downward curvature of a leaf due to a higher rate of growth on the upper surface Which of the above statements are correct?
Consider the following statements: 1. IS 3583 refers to Burnt Clay Paving Bricks. 2. IS 5779 refers to Burnt Clay Soling Bricks. 3. IS 3952 refers to Burnt Clay Hollow Bricks. 4. IS 2222 refers to Burnt Clay Lay Bricks. Which of the above statements are correct? 
If a FM signal having modulation index mf is passed through a frequency tripler, then the modulation index of output of frequency tripler is ________
If a FM signal has modulation index m, then what will be its modulation index after passing through frequency tripler?