MLR Institute of Technology

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MLR Institute of Technology Laxma Reddy Avenue, Dundigal, Quthbullapur (M), Hyderabad 500 043 Phone Nos: 08418 204066 / 204088, Fax : 08418 204088 ELECTRONICS AND COMMUNICATION ENGINEERING OBJECTIVE

1 MLR Institute of Technology Laxma Reddy Avenue, Dundigal, Quthbullapur (M), Hyderabad Phone Nos: / , Fax : ELECTRONICS AND COMMUNICATION ENGINEERING OBJECTIVE TYPE QUESTIONS UNIT I 1. Consider the following sequence of micro-operations. MBR <- PC MAR <- X PC <- Y Memory <- MBR Which one of the following is a possible operation performed by this sequence? (A) Instruction fetch (B) Operand fetch (C) Conditional branch (D) Initiation of interrupt service [D] 2. The smallest integer that can be represented by an 8-bit number in 2 s complement form is (A) -256 (B) -128 (C) -127 (D) 0 [B] 3. A RAM chip has a capacity of 1024 words of 8 bits each (1K 8). The number of 2 4 decoders with enable line needed to construct a 16K 16 RAM from 1K 8 RAM is (A) 4 (B) 5 (C) 6 (D) 7 [B] 4. In multiple Bus organisation, the registers are collectively placed and referred as. a) Set registers b) Register file c) Register Block d) Map registers [B]

2 5. The ISA standard Buses are used to connect, a) RAM and processor b) GPU and processor c) Harddisk and Processor d) CD/DVD drives and Processor [C] 6. The main advantage of multiple bus organisation over single bus is, a) Reduction in the number of cycles for execution b) Increase in size of the registers c) Better Connectivity d) None of these [A] 7. RISC Processors discouraging which control unit a) Hardwired b) Micro Programming c) both d) none [B] 8. A static pipeline is specified by reservation table whereas the dynamic pipeline is specified by reservation tables a) one, more than one b)one, one c)more than one, more than one d) more than one, one [A] 9. Assume that the time required for the 5 functional units whic operate in each of the 5 cycles are:10ns, 8ns,10ns, 10ns and 7ns. Assume that the pipelining adds 1 ns of overhead.find the speedup vs the single data path. a) 4.1 times b) 4.5 times c) 4.8 times d) 3.7 times [A] 10. The method for updating the main memory as soon as word is removed from the cache is called a) Write-through b) Write - back c) Protected write d) Cache Write [B]

3 UNIT - II 1. is the bootleneck, when it comes computer performance. a) Memory access time b) Memory cycle time c) Delay d) Latency [B] 2. The minimum time delay between two successive memory read operations is. a) Cycle time b) Latency c) Delay d) None of the above [A] 3. A memory organization that can hold upto 1024 bits and has a minimum of address lines can be organized into 128 x x x x1 [D] 4. The number of external connections required in 16x8 memory organization is a) 14 b) 19 c) 15 d) 12 [A] 5. The larger memory placed between the primary cache and the memory is called a) Level 1 cache b) Level 2 cache c) EEPROM d) TLB [B] 6. The effectiveness of the cache memory is based on the property of. a) Locality of reference b) Memory localization c) Memory size d) None of the above [A] 7. The spatial aspect of the locality of reference means a) That the recently executed instruction is executed again next b) That the recently executed wont be executed again c) That the instruction executed will be executed at a later time

4 d) That the instruction in close proximity of the instruction executed will be executed in future [D] 8. The techniques which move the program blocks to or from physical memory is called as a) Paging b) Virtual memory organisation c) Overlays d) Framing [B] 9. The binary address issued to data or instructions are called as. a) Physical address b) Location c) Relocatable address d) Logical address [D] 10. The type of control signal are generated based on, a) contents of the step counter b) Contents of IR c) Contents of condition flags d) All of the above [D] UNIT III 1. The USB device follows structure. a) List b) Huffmann c) Hash d) Tree [D] 2. USB is a parallel mode of transmission of data and this enables for the fast speeds of data transfers. a) True b) False [B] 3. The device can send a message to host by taking part in for the communication path. a) Arbitration b) Polling c) Prioritising d) None of the above [B] 4. The devices connected to USB is assigned an adrress. a) 9 bit b) 16 bit

5 c) 7 bit d) 4 bit [C] 5. Locations in the device to or from which data transfers can take place is called. a) End points b) Hosts c) Source d) None of the above [A] 6. The initial address of a device just connected to the HUB is. a) AHFG890 b) c) FFFFFFF d) [B] 7. The transformation between the Parallel and serial ports is done with the help of. a) Flip flops b) Logic circuits c) Shift registers d) None of the above [C] 8. The mode of transmission of data, where one bit is sent for each clock cycle is. a) Asynchronous b) Parallel c) Serial d) Isochronous [D] 9. The standard used in serial ports to facilitate communication is. a) RS-246 b) RS-LNK c) RS-232-C d) Both a and b [C] 10. In serial port interface, the INTR line is connected to. a) Status register b) Shift register c) Chip select d) None of the above [A]

6 UNIT IV 1. Compaction means a) A technique for overcoming internal fragmentation b) A paging technique c) A technique for overcoming external fragmentation d) A technique for overcoming fatal error [C] 2. Operating system maintains a page table for a) Each process b) Each thread c) Each instruction d) Each address [A] 3. With paging there is no fragmentation a) Internal b) External c) Either type of d)none of these [A] 4. The size of a page is typically : a) varied b) power of 2 c) power of 4 d) None of these [B] 5. Every address generated by the CPU is divided into two parts : (choose two) a) frame bit b) page number c) page offset d) frame offset [B,C] 6. Physical memory is broken into fixed-sized blocks called. a) frames b) pages c) backing store d) None of these [A] 7. The advantage of dynamic loading is that : a) a used routine is used multiple times b) an unused routine is never loaded

7 c) CPU utilization increases d) All of these [B] 8. If the process can be moved during its execution from one memory segment to another, then binding must be : a) delayed until run time b) preponed to compile time c) preponed to load time d) None of these [A] 9. The circular wait condition can be prevented by a) defining a linear ordering of resource types b) using thread c) using pipes d) all of the mentioned [A] 10. For effective operating system, when to check for deadlock? a) every time a resource request is made b) at fixed time intervals c) both (a) and (b) d) none of the mentioned [C] UNIT - V 1. Management of metadata information is done by a) file-organisation module b) logical file system c) basic file system d) application programs [B] 2. A file control block contains the information about a) file ownership b) file permissions c) location of file contents d) all of the mentioned [D] 3. Which table contains the information about each mounted volume? a) mount table b) system-wide open-file table c) per-process open-file table

8 d) all of the mentioned [D] 4. To create a new file application program calls a) basic file system b) logical file system c) file-organisation module d) none of the mentioned [B] 5. Distributed naming services/distributed information systems have been devised to : a) provide information about all the systems b) provide unified access to the information needed for remote computing c) provide unique names to all systems in a network d) All of these [B] 6. Domain name system provides : a) host-name-to-network-address translations for the entire internet b) network-address-to-host-name translations for the entire internet c) binary to hex translations for the entire internet d) All of these [A] 7. A mount point is : a) an empty directory at which the mounted file system will be attached b) a location where everytime file systems are mounted c) is the time when the mounting is done d) None of these [A] 8. When a file system is mounted over a directory that is not empty : (choose all that apply) a) the system may disallow the mount b) the system must allow the mount c) the system may allow the mount and the directory s existing files will then be made obscure d) All of these [C] 9. In UNIX, exactly which operations can be executed by group members,other users is definable by a) the group s head b) the file s owner c) the file s permissions d) All of these [B]

9 10. A process lower the priority of another process, if both are owned by the same owner. a) must b) can c) cannot d) None of these [B]

101. The memory blocks are mapped on to the cache with the help of a) Hash functions b) Vectors c) Mapping functions d) None of the mentioned

101. The memory blocks are mapped on to the cache with the help of a) Hash functions b) Vectors c) Mapping functions d) None of the mentioned 102. During a write operation if the required block is not