101⟩ Why length of antenna is taken as one half of wavelength or one fourth of wavelength? Why not one eighth or one sixteenth?
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102⟩ On-line information system provides1. users with immediate access to all the files for interrogration2. users to do initial amendment or updation of files initially3. processing of periodically collected data in group at specific intervals4. the usage of separated and not connected data with the main computer
2. users to do initial amendment or updation of files initially
103⟩ Consider a computer with 8M bytes of main memory and a 128K cache. The cache block size is 4K. It uses a direct mapping scheme for cache management. How many different main memory blocks can map onto a given physical cache block.1. 2048 2. 2563. 64 4. None of these
2. 256
104⟩ Explain what are edge triggered flip flop and level triggered flip flop? How do they differ from one another?
Edge triggered flip flop are of two types
1. Positive edge triggered flip flop-In a pulse train when ever the input is changing its state from negative edge to positive edge then it will be considered as logic 1 otherwise it is 0
2. Negative edge triggered flip flop-same as above but reverse.
LEVEL TRIGGERED FLIP FLOP are two types
1. Positive level triggered flip flop-in a pulse train when ever the pulse is high then it will be logic 1 otherwise it is zero.
2. Negative level triggered flip flop-in a pulse train when ever the pulse is low then it will be logic 1 otherwise it is zero.
105⟩ Do you know Q-Meter works on which principal?
A direct-reading instrument which measures the Q of an electric circuit at radio frequencies by determining the ratio of inductance to resistance, and which has also been developed to measure many other quantities. Also known as quality-factor meter.
106⟩ The Cost of storing a bit is minimum in1. Cache 2. Register3. RAM 4. Magnetic tape
Magnetic Tape
107⟩ Explain why vestigial side band is used in TV Signal Transmission?
Actually Double Side band transmission is not wasting any data while traonsmission. But the problem with DSB is its bandwidth required is more. SSB requires less bandwidth. But there is no practical device exactly cut the sidebands and low frequency part contains important information. Therefore VSB ( Vestigeal Side Band) transmisson is preferred
108⟩ Explain why making capacity of the circuit breaker is higher than breaking capacity?
Making capacity is the max fault current it can carry during closing of breaker, e.g. You are closing a breaker on fault. The making capacity is always higher because it is expressed in peak value not rms, and also because of the DC offset, voltage and PF while closing
109⟩ How to Convert Binary to Excess 3 Code and vice verse?
A number i binary can be converted to excess-3 just by adding the binary equivalent of 3 to the binary number.similarly a number in excess-3 can be converted to binary just by subtracting the binary equivaent of 3 from the binary number.
110⟩ What are the advantages of using C band for satellite communication?
"Better performance under adverse weather conditions"
111⟩ In a ripple counter using edge-triggered JK flip-flop. the pulse input is applied to the1. clock input of oll flip-flops2. clock input of one flip-flop3. J and K input of one flip-flop4. J and K input of all flip-flops
2. clock input of one flip-flop (first)
112⟩ What is the difference between Circuit Switching and Packet Switching?
Circuit switching is the transmission technology that has been used since the first communication networks in the nineteenth century. In circuit switching, a caller must first establish a connection to a callee before any communication is possible. During the connection establishment, resources are allocated between the caller and the callee.
packet switching is a more recent technology than circuit switching which addresses a disadvantage of circuit switching: the need to allocate resources for a circuit, thus incurring link capacity wastes when no data flows on a circuit. Packet switching introduces the idea of cutting data on a flow into packets which are transmitted over a network without any resource being allocated.
113⟩ Explain which oscillator is best for general purpose?
Oscillators generate a frequency it should be noted that it does not create energy, but nearly acts as an energy converter.
114⟩ Where will Digital and Analog technology come into play in the CCTV technology in terms of data storage?
Data storage is mostly digital now-a-days because of cost,density,ease. CCTV or anything it may be, digital data is stored in ROM ( Read only Memory ) or EPROM (Erasable and Programmable ROM) or Flash memory. All of these include the same technology of storing digital information using transistors,capacitors.
115⟩ What is the addressing mode used in the instruction PUSH B is1. direct 2. register3. register indirect 4. immediate
Push is used to write into stack
1. This is not direct we are not mentioning address here
2. It's not register indirect we are not mentioning reg which contain address
3. It's not immediate we are not storing immediate value
so answer is 2 it's register addressing
116⟩ What are potential transformers?
Potential Transformer is designed for monitoring single-phase and three-phase power line voltages in power metering applications. The primary terminals can be connected either in line-to-line or in line-to-neutral configuration. Fused transformer models are designated by a suffix of "F" for one fuse or "FF" for two fuses. A Potential Transformer is a special type of transformer that allows meters to take readings from electrical service connections with higher voltage (potential) than the meter is normally capable of handling without at potential transformer.
117⟩ How to identify how many states the ripple counter is having by looking at the figure as it can also have some invalid states?
If in the ripple counter, there are 3 flip flops, it is a mod-8 counter which counts from 0-7(binary). If additional circuitry is used, then it is a counter where few states have been trapped. Usually this is done by connecting a Nand gate output to the clear inputs of all the flip flops in a ripple counter. The clear signal is a active low signal and hence clears the flip flops to 000 when the output of the Nand gate goes low. The inputs to the Nand gates come from the flip flop outputs when they represent the count which we need to eliminate.
For ex: If a mod-8 counter is to be altered to count from 000-011 (0-6), i.e., we need to build a mod-7 counter from a mod-8 counter. To do this, we need to clear the counter to 000 once the count reaches 7. In effect, the counter needs to count from 0-6 and recycle back to 0. To do this connect the outputs of the flip flops which go high on a count of 7. This makes the output of the Nand gate high when a count of 7 is attempted, and hence clears the count back to 000.
118⟩ Explain the following fields objective qns and answers.DSPCDIGITAL ELECTONICSFUNDAMENTAL ELECTONICSLIC
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119⟩ Explain what is angle and amplitude modulation? what is noise in modulation?
modulation means change. to send a message of low frequency to a far distance we use a carrier of high frequency to carry the message. while transfering we change some parameters of carriers for faithful tranformation of message signal. if the amplitude of the carrier is varied in accordance with frequency of message signal then it is called amplitude modulation. if either phase or frequency is changed in accordance with the frequency of message signal then it is called angle modulation.
noise is an unwanted signal which enter in signal while transfering a signal and makes the signal distorted.
120⟩ Which of the following remarks about BDC is true?1. it is an 8-4-2-1 weight code2. complement of a number can be found efficiently3. (12345678)10 needs 4 bytes in BCD representation4. conversion to and from the decimal system can be easily done
1,3,4 are correct options Because BCD is 8-4-2-1 weighted code, whose complement cannot be found easily, given number requires 4 bytes as it is 8 digit number (4 bits for number), it is easily converted to binary.
