ECA JNTUH MID UNIT-1 BITS

                                                  ECA

                                                        JNTUH OBJECTIVE EXAM

                                         UNIT-1: (SINGLE STAGE AMPLIFIERS)

SECTION-I : Choose the correct answers

1.  Which of the following amplifier has high power gain [ ]

(a) CB (b) CE (c) CC (d) both CB and CE

2.  The slope of ac load line is _________ that of dc load line. [  ]

(a) same as (b)more than (c) less than (d) None of the above

3.  In a RC coupled amplifier, which of the following component is mainly responsible for harmonic distortion of the signal [ ]

(a) Transistor (b) Biasing resistor (c) coupling capacitor (d) power supply

4.  The voltage gain of well designed single stage CB amplifier is essentially determined by ac collector load and [ ]

A. Emitter resistor Re B. ac alpha C. Input resistance emitter diode D.ac beta.

5.  The emitter of a CE amplifier has no AC voltage because of the [ ]

A. DC voltage unit B. Bypass Capacitor C. Coupling capacitor D. load resistance

6.  Typical value of h_ie is [ ]

A. 1k B. 25k C.50k D.100k

SECTION-II: Fill in the blanks

7. The parameter h22 has units of _______.

8. A CC Amplifier has highest __________ but lowest ________.

9. The current gain of single stage CE amplifier is nearly equal to __________.

10. The input impedance R_i of a CE amplifier in terms of h_ie, h_oe, h_re and load resistance. ___________________.

11. The phase difference between output and input voltages of a CB amplifier is

12. According to Miller’s theorem, the feedback capacitance when referred to input side with gain A is _______________________.

13. Trans conductance g_m in hybrid - π model is defined as ______________________.

                                                                                                                  

                                        Prepared by

                                      Neelima & Dhanalakshmi

                                                          

STLD jntuh unit-1 bits

                                               STLD

                                                   FIRST MID JNTUH ONLINE BITS    
            

                                        UNIT-1(Number systems and codes)

Section-I :  choose the correct answer

 1. The fraction (0.68)₁₀ is equal to [        ]

a) (0.010101)₂ b) (0.101)₂ c) (0.10101)₂ d) (0.10111)₂

2. The Hexadecimal number A0 has the decimal value [    ]

a)80 b) 256 c) 100 d) 160

3. Given two numbers A & B in sign magnitude representation in an eight bit format A=00011110 & B=10011100,   A XOR B gives [    ]

a)10000010 b) 00011111 c) 10011101 d) 11100001

4. The value of binary 1111 is [ ]

a) 2³-1 b) 2⁴-1 c) 2⁴ d) none of these

 5. The minimum number of bits required to represent negative numbers in the range of -1 to -11 using 2’s complement arithmetic is [ ]

(a)2 (b) 3 (c) 4 (d) 5

6. The following code is not a BCD code. [ ]

a)Gray code (b) Xs-3 code (c) 8421 code (d) All of these

7. A 15-bit hamming code requires [ ]

(a)4 parity bits (b) 5 parity bits (c) 15 parity bits (d) 7 parity bits

 8.If=5,the base(radix) of the number system is [ ]

a)5 (b) 6 (c) 7 (d) 8

9. The hexadecimal number system is used in digital computers and digital systems to [ ]

(a) Perform arithmetic operations (b) Perform logic operations (c) Perform arithmetic and logic operations (d) Input binary data into the sys

10.  Determine the value of base x  if : (211)_x = (152)₈ [ ]

(a) 2 (b) 10 (c) 8 (d) 7

11.  Determine the value of base x, if (193)_x = (623)₈ [ ]

(a)16 (b)4 (c)2 (d)5

12.  Which of the following are called Universal gates [ ]

(a) NAND,NOR (b) AND,OR (c) XOR XNOR (d) OR,XOR

Section-II: Fill in the blanks

18. Cyclic codes are also called ________________codes

19. The basic two types of BCD codes are _______________and________ codes.

20. The distance between code words 10010 & 10101 is ________.

21. Convert the binary code (110110)2 to Gray code_____________.

22. Conversion of 0.1289062 decimal number to its hexa equivalent is ________.

23. In b’s complement method, the carry is ______ and in(b-1)’s complement method the carry is _______

24. The MSB of a binary number has a weight of 512,the number consists of _________ bits.

25. __________ are codes which represent letters of the alphabets and decimal numbers as a sequence of 0s and 1s.

 

                                                                                                                Prepared by

                                                                                                              Srilatha & Sowmya

                                                                                                           

II Semester   ACADEMIC CALENDER

Commencement of class work	17.12.2012
I Spell  of Instructions	17.12.2012	09.02.2013    (8w)
I  mid examinations	11.02.2013	16.02.2013     (1w)
II Spell of Instructions	18.02.2013	13.04.2013    (8w)
II mid examinations	15.04.2013	20.04.2013     (1w)
Preparations  & Practical examinations	22.04.2013	04.05.2013     (2w)
End semester examinations	06.05.2013	18.05.2013      (2w)
Supplementary Examinations	20.05.2013	01.06.2013     (2w)
Summer vacation	02.06.2013	30.06.2013       (4w)
Commencement of class work for the A. Y. 2013-14	01.07.2013 (Mon)

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ECE Dept.

Sphoorthy Engg College