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In an AM system receiver. the mixer translates the carrier frequency fc to a fixed intermediate frequency of 450 kHz. Given a broadcast signal of frequency 900 kHz. What is the corresponding image frequency when a superhetrodyne receiver is employed with local oscillator frequency greater than the broadcast signal frequency?
Consider the following statements regarding the Moore and Mealy models: 1. In the Mealy circuit, the final output depends only on the present state of memory elements. 2. In the Moore circuit, output can change in between the clock edges if the external inputs change. 3. The implementation of a logic function in the Mealy circuit needs fewer states than the Moore circuit. Which of the above statements are not correct?
Wages of the workers are normally, the proportionality derived from their efficiency. But the concept of efficiency of labour is itself vague such as amount of physical output, output per man hour or output per man shift. But output is not the function of man alone. There are other factors which affect the output. Which among the following is/are not the factor(s) that would affect the output directly?
1. Physical condition of work
2. Nature of machinery
3. Technical process
4. Quality of raw material
5. System of management
6. Role of fellow workers
7. Competitors in the market
The different age group people go for a morning walk. The age of 20 people who go for a morning walk is as follows: 19, 15, 34, 45, 69, 74, 24, 67, 77, 89, 91, 45, 65, 35, 56, 67, 55, 23, 78, 52 The Grouped frequency distribution table of above will be: (A)  S. No Class Frequency 1 0-20 2 2 20-40 4 3 40-60 5 4 60-80 7 5 80-100 2 (B)  S. No Class Frequency 1 0-20 3 2 20-40 3 3 40-60 5 4 60-80 6 5 80-100 3 (C) S. No Class Frequency 1 0-20 2 2 20-40 4 3 40-60 5 4 60-80 5 5 80-100 4 (D) S. No Class Frequency 1 0-20 2 2 20-40 7 3 40-60 2 4 60-80 7 5 80-100 2
A source of unknown frequency gives 4 beats / s, when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 Hz. The unknown frequency is:
In active power and frequency control, a. Frequency should remain constant b. A considerable drop in frequency could result in low magnetizing currents in induction motors and transformers. c. The frequency of a system is dependent on reactive power balance. d. Relatively closed control of frequency ensures constancy of the speed of induction motors. Which of the above statements are incorrect?
The frequency response of the filter in the stop band. i. Decreases with increase in frequency ii. Increase with increase in frequency iii. Decreases with decrease in frequency iv. Increases with decrease in frequency
An audio signal (say from 50 Hz to 10000 Hz) is frequency translated by a carrier having a frequency of 106 Hz. The values of initial (without frequency translation) and final (after frequency translation) fractional change in frequency from one band edge to the other are
Short circuit test is performed on a transformer with a certain impressed voltage at rated frequency. What will happen if the short circuit test is now performed with the same magnitude of impressed voltage, but at frequency higher than the rated frequency?
In comparing the operation of the half-controlled 2-pulse circuit with that of the fully-controlled circuit, which of the following statements are evident? 1. Since half the thyristors are replaced by diodes, a half-controlled converter costs less than a fully-controlled converter. 2. Due to the freewheeling action with a half-controlled bridge-circuit power factor is improved in half-controlled converters. 3. The AC supply current is more distorted due to its zero periods with the half-controlled circuit, compared to a fully-controlled bridge circuit. Select the correct answer using the code given below :