2023 2024 Student Forum > Management Forum > Main Forum

 
  #2  
31st July 2014, 03:13 PM
Super Moderator
 
Join Date: Apr 2013
Re: PSU Sector Past Years Papers

Here I am giving you question paper for public sector undertaking companies technical examination in a file attached with it .

PSU Electronics Question paper :

The order of an internal node in a B+ tree index is the maximum number of children it can have. Suppose that a child pointer takes 6 bytes, the search field value takes 14 bytes, and the block size is 512 bytes. What is the order of the internal node?
A) 24 B) 25 C) 26 D) 27
Answer : (C)

The Boolean function x, y, + xy + x, y
A) x, + y, B) x + y C) x + y, D) x, + y
Answer : (D)

In an MxN matrix such that all non-zero entries are covered in a rows and b columns. Then the maximum number of non-zero entries, such that no two are on the same row or column, is A) £ a + b B) £ max {a, b} C) £ min {M-a, N-b} D) £ min {a, b}
Answer : (A)

The minimum number of page frames that must be allocated to a running process in a virtual memory environment is determined by
A) the instruction set architecture B) page size C) physical memory size D) number of processes in memory
Answer : (D)

The best data structure to check whether an arithmetic expression has balanced parentheses is a A) queue B) stack C) tree D) list
Answer : (B)

The address resolution protocol (ARP) is used for
A) Finding the IP address from the DNS
B) Finding the IP address of the default gateway
C) Finding the IP address that corresponds to a MAC address
D) Finding the MAC address that corresponds to an IP address
Answer : (D)

The goal of structured programming is to
A) have well indented programs
B) be able to infer the flow of control from the compiled code
C) be able to infer the flow of control from the program text
D) avoid the use of GOTO statements
Answer : (C)

Which data structure has the fastest insertion procedure?
A) Binary search tree
B) Ordered array
C) Heap
D) Unordered linked list
E) Ordered linked list

SQL is the combination of
A ) DDL and DQL
B ) DDL , DML and DQL
C ) DDL,DML,DQL and DCL
D ) None of these

Which of the following applications may use a stack?
A) A parentheses balancing program.
B) Keeping track of local variables at run time.
C) Syntax analyzer for a compiler.
D) All of the above

Which of the following is not a type of Operating System ?
(A) Multi-programming (B) Time-sharing
(C) Real-time (D) Concurrent Programming

The mechanical, magnetic, electronic and electrical devices from which a computer is fabricated is
called :
(A) Magnetic Core (B) Firmware
(C) Hardware (D) Software

The most efficient data-type for a variable that stores the number 4.6 e 20 is the _______ data-type.
(A) Character (B) Float
(C) Long integer (D) Short integer

Which of the following is a logical OR operator ?
(A) && (B) ||
(C) ? : (D) &

Which of the following is not a valid declarations for a C++ character string ?
(A) char S[6] ; (B) char S[6] = “Hello” ;
(C) char * S ; (D) char S[ ] ;

A function’s single most important role is to :
(A) give a name to a block of code (B) reduce program size
(C) accept arguments and provide a return value(D) help in organizing a program into conceptual units

Which of the following 4-bit number equals its 2’s Complement ?
(A) 1010 (B) 1000
(C) 0101 (D) 1100

The basic unit of measurement used for measuring opposition to current flow in a circuit is :
(A) volt (B) ampere
(C) ohm (D) watt

Programming in a language that actually controls the path of signals or data within a computer is called :
(A) Micro-programming (B) System programming
(C) Assembly programming (D) Machine programming

Which of the following is not a port/connection ?
(A) PS-2 (B) COM
(C) SMPS (D) LPT

What is the output of the following code ?
for (int a = 1; a < = 1; a++) cout << a++; cout << a;
(A) 22 (B) 12
(C) 13 (D) 23

Inheritance is a way to :
(A) organize data
(B) pass arguments to objects of classes
(C) add features to existing classes without rewriting them
(D) improve data-hiding and encapsulation

What is a Constructor ?
(A) A function called when an instance of a class is initialized
(B) Function that is called when an instance of a class is deleted
(C) A special function to change the value of dynamically allocated memory
(D) A function that is called in order to change the value of a variable

Which of the following gives the value stored in pointer a ?
(A) a; (B) val(a);
(C) *a; (D) &a;

Array passed as an argument to a function is interpreted as :
(A) Address of the array (B) Value of the first element of the array
(C) Address of the first element of the array (D) Number of elements of the array

Which of the following is the feature of stack ?
(A) All operations are at one end (B) It cannot reuse its memory
(C) All elements are of different data types (D) Any element can be accessed from it directly

What is the Postfix Expression for the following Infix (Inorder) expression ?
2*3-4/5
(A) 23*45/- (B) 23*-45/
(C) 23*45-/ (D) *23/45-

Binary search requires data to be in what order ?
(A) Increasing (B) Decreasing
(C) Random (D) Sorted

You are making your own database so that you can organize information about your ‘Top 100’ movies. You want to include information like Title, Actor (s), Director, Year etc. Each record in your database will represent :

(A) An actor (B) A director
(C) A year (D) A movie

What will be a suitable criterion that should be entered for a query to search for Employee Names beginning with M ?

(A) Start with M (B) Like M
(C) Like M* (D) Like ‘M*’

A field that is a primary key in another table is called a _______ .
(A) special key (B) foreign key
(C) simple key (D) composite key

This aggregate SQL function will return the number of rows in a database table :
(A) COUNT (*) (B) Rows (*)
(C) NUM (*) (D) SUM (*)

Which topology requires a central controller or hub ?
(A) Mesh (B) Star
(C) Bus (D) Ring

. In_______transmission, the channel capacity is shared by both communicating devices at all times :
(A) Simplex (B) Half-duplex
(C) Full-duplex (D) Half-simplex

________is the protocol suite for the current Internet.
(A) TCP/IP (B) NCP
(C) UNIX (D) ACM

In C++, to write data containing variables of type float, to an object of type of stream, you should use :
(A) The insertion operator (B) seek ()
(C) write () (D) put ()

A message from device A consists of packet X and packet Y. In the virtual circuit approach to packet switching, packet Y’s path ____________ packet X’s.
(A) is the same as (B) is dependent on
(C) is independent of (D) is always different from

There are n devices arranged in a ring topology. A device is deleted. There are now _____ links of
cable.
(A) n – 1 (B) n – 2
(C) n (D) n + 1

Which factor makes twisted-pair cable superior to fiber-optic cable ?
(A) signal attenuation (B) noise resistance
(C) bandwidth range (D) cost


Q. Power diode is generally made from
a) Silicon
b) Germanium
c) Both
d) None of these

Q. When the both junction of NPN diode is reverse biased, then the diode is in which mode
a) Active
b) Cutoff
c) Saturation
d) inverted

Q. Which transistor mode gives the inverted output
a) Common Emitter
b) Common Base
c) Common Collector
d) None of these

Q. Which coupling gives the higher gain in case of amplifier
a) Capacitor coupling
b) Impedance coupling
c) Transformercoupling

Q. Which distortion is least objectionable in audio amplification
a) Phase
b) Frequency
c) Harmonic
d) Intermediation

Q. A narrow band amplifier has a band pass nearly…………of central frequency
a) 33.3%
b) 10%
c) 50%

Q. Phase shift oscillator consists
a) RL
b) RC
c) RLC

Q. Multivibrater Produces
a) Sine wave
b) Square wave
c) Smooth wave
d) sawtooth

Q. Convert the 101101 Binary number into octal no
a) 65
b) 55
c) 51
d) 45

Ans: 55

Q. 10 in BCD
a) 10100
b) 1100
c) 010111
d) None of these

Ans: None of these

Q. Which PNP device has a terminal for synchronizing purpose
a) SCS
b) Triac
c) Diac
d) SUS

Q. Addition of indium in semiconductor crystal makes
a) PNP
b) NPN

Q. Free electron exists in which band
a) 1
b) 2
c) 3
d) Conduction band

Q. Ripple factor of half wave rectifier
a) 1.21
b) 0.48
c) 0.5

Q. Transistor that can be used in enhancement mode
a) NPN
b) UJT
c) JFET
d) MOSFET

Q. Following contributes to harmonic distortion in Amplifier
a) +Ve feedback
b) –Ve feedback
c) Defective active device

Q. High cutoff frequency
a) CB
b) CC
c) CE

Q. Which is used as data selector?
a) Encoder
b) Decoder
c) modulator
d) Demodulator

Q. Read write capable memory
a) RAM
b) ROM
c) Both
d) None of these

Q.the radix or base of hexadecimal number system is ———–
a) 8
b) 16
c) 5
d) none of these

Ans: 16

Q.the no of 1’s in the binary representation of the expression 162*9+162*7+16*5+3 are
a) 10
b) 23
c) 6
d) 4

Q. the no of latches in F/F are ——-
a) 1
b) 2
c) 3
d) 4

Q.how many flip-flops are required to construct Mod -12 counter
a) 5
b) 4
c) 12
d) none

Ans: 4

Q. which logic gate has the output is compliment of its input ———-
a) OR
b) AND
c) NOT
d) X-OR

Ans: NOT

Q.no.of 2-input multiplexers needed to construct a 210 input multiplexer…….
a) 12
b) 31
c) 20
d) 16

Q.By adding inverters to the inputs and output of a AND gate we can obtain ……………
a) OR
b) AND
c) NOT
d) X-OR

Ans: X-OR

Q.how many NAND gates are needed to realize OR gate ————–
a) 1
b) 2
c) 3
d) 4

Ans: 3

Q.which is the first integrated logic family —————
a) RTL
b) DTL
c) TTL
d) none of these

Q. Which logic gate has output high if and only if all inputs are low ———?
a) NOR
b) NAND
c) X-NOR
d) AND

Ans: NAND

Q.According to Boolean algebra 1+A+B+C =
a) A
b) A+B+C
c) 1
d) none of these

Ans: 1

Q. If a=0x6db7 and b=0x2ae9 then what is the value of a”b————–
a) binary number for 1001.1101?
b) decimal number for 19?
c) excess-3 code for 29?

Q.what is the value of A’+1 ?
a) A
b) A’
c) 1
d) none of these

Ans: 1

Q.2 in 4 bit number one bit indicates sign of the number then the locations are from
a) -8 to 8
b) -7 to 7
c) -16 to 16
d) None

Q.Avalanche photo diode is used when compared to PIN diode bcz
a)larger band width
b)high sensitivity
C)——-
d)——–

Q.some non zero DC voltage is to RC low pass circuit then the DC voltage in the output contains
a) Same as in input
b) Higher than input
c) Zero
d) Slightly increases

Q.if the output of the gate is always high then the gates applied to this logic are 0,0
a) NAND and EX-NOR
b) NAND and NOR
c) AND and X-NOR
d) OR and XOR

Ans:a

Q.Thermal Run away is not possible in FET bcz the flow of
a)minority careers
b)Transconductance
c)_____
d)none

Ans : minority careers

Q.which of the following is/are true about 1′s and 2′s compements:
i)In 1′s complement form. 0 has two representations
ii)in 1′s complement, the magnitude of lowest number is equal to the magnitude of highest number
iii)In 2′s complement, 0 has two representations

a) i only
b) i and ii
c) iii only
d) all of these

Q.In the hybrid parameter model of a transistor reverse transfer voltage ratio and forward transfer current ratio are respectively given by:
a) h11 and h21
b) h12 and h11
c) h21 and h11
d) None of these

Q.The largest negative no can be represented with 8 bits in 2′s compliment representation?
a)-256
b)-255
c)-127
d)-128

Ans: -128

Q. How many NAND gates required to implement AB+CD+EF
a) 1
b) 2
c) 3
d) 4

Ans: 4

Q. Transparent latch is seen in which type of flip flop
a) SR FF
b) D FF
c) JK FF
d) D FF

Ans: D FF

Q. Odd parity generator uses which logic?
a) Digital
b) Analog
c) Sequential
d) none

Q. Which type of ADC is fastest?
a) SARC
b) Counter type
c) Intigrated type
d) Flash

ANS: Flash/Parallel

Q. Which one of the following is fastest read/writable memory?
a) PROM
b) EEPROM
c) Flash
d) none

Ans: Flash

8. In array programming which one is used
a) SISD
b) PISD
c) MISD
d) None

Q.Which one of the following has high I/p impedance
a) CC
b) CB
c) CE
d) None

Q. The maximum time allowed time for each flip flop for a mod 10 synchronous counter if each flip flop delay is 25ns.
a) 25 ns
b) 50 ns
c) 100 ns
d) none

Q. The resolution for a DAC is given by 0.4% then no. of bits of DAC is
a) 8- bits
b) 16- bits
c) 32- bits
d) none

Ans: 8- bits

41) The chip capacity is 256 bits, then the no.of chips required to build 1024 B memory Is
a) 32
b) 16
c) 15
d) 4

Q. Which of the following are correct?
1)A flip-flop is used to store 1-bit of information
2)Race around condition occurs in JK flip flop when both the inputs are 1
3)Master slave flip flop is used to store 2 bits of information
4)A transparent latch consists of a D- flip flop

a) 1,2,3
b) 1,3,4
c) 1,2,4
d) 2,3,4

Ans: 1,2,4

Q. output resistance of ideal OP AMP is
a) 0
b) 1
c) infinite
d) very high

ANS: 0

Q. CMRR of an OP AMP is given as 80db and Ad is 20000.Value of Acm will be
a) 4
b) 8
c) 2
d) 1

Ans: 2

Q.Si,Ge lie in ……..block of periodic table
a) III
b) V
c) IV A
d) IV B

Ans: IV A

Q.to obtain 10 mV resolution on 5 V range how many bit DAC is to be used
a) 4
b) 8
c) 16
d) 32

Q.% resolution of a 10 bit ADC
a) 1.588%
b) 0.392%
c) 0.0978%
d) 0.0244%

Ans: 0.0978%

Q.Efficiency of half wave rectifier
a) 45%
b) 50%
c) 86%
d) 100%


Quick Reply
Your Username: Click here to log in

Message:
Options

Thread Tools Search this Thread



All times are GMT +5. The time now is 12:03 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
SEO by vBSEO 3.6.0 PL2

1 2 3 4