Basic Questions in Electronics and Communications Engineering

Paper-II

11. The following quantity is not required in the calculation of Q of a cavity resonator
(a) Energy stored (b) Power dissipated
(c) Loss in radiation (d) Dimensions of the cavity

20. If (11X1Y)8 = (12C9)16 then the values X and Y are
(a) 5 and 1, (b) 5 and 7, (c) 7 and 5, (d) 1 and 5

36. The following register holds the instruction before it goes to the decoder:
(a) Control register, (b) Accumulator, (c) Address register, (d) Data register

73. Consider the following statements regarding registers and latches:
1. Registers are temporary storage devices, whereas latches are not.
2. A latch employs cross-coupled feedback connections.
3. A register stores a binary word, whereas a latch does not.
The correct statement(s) is/are
(a) 1 only, (b) 2 only, (c) 1 and 3, (d) 2 and 3

108. Statement (I): In a transistor designed to be used for power amplification, the
collector size is largest relative to the emitter and base.
Statement (II): The collector is connected to the body of the transistor and hence to a
heat sink for heat dissipation to be effective.
Codes:
(a) Both Statement (I) and Statement (II) are individually true and Statement (II)
is the correct explanation of Statement (I)
(b) Both Statement (I) and Statement (II) are individually true but Statement (II)
in not the correct explanation of Statement (I)
(c) Statement (I) is true but Statement (II) is false
(d) Statement (I) is false but Statement (II) is true

109. Statement (I): The carry look-ahead adder is a fast adder
Statement (II): The carry look-ahead adder generates the carry and the sum digits
directly.
Codes:
(a) Both Statement (I) and Statement (II) are individually true and Statement (II)
is the correct explanation of Statement (I)
(b) Both Statement (I) and Statement (II) are individually true but Statement (II)
in not the correct explanation of Statement (I)
(c) Statement (I) is true but Statement (II) is false
(d) Statement (I) is false but Statement (II) is true

118. Statement (I): Gunn effect device is a slice made from n-doped GaAs and provides
negative resistance characteristics.
Statement (II): GaAs has an empty energy band higher in energy than the filled or
partly filled bands.
Codes:
(a) Both Statement (I) and Statement (II) are individually true and Statement (II)
is the correct explanation of Statement (I)
(b) Both Statement (I) and Statement (II) are individually true but Statement (II)
in not the correct explanation of Statement (I)
(c) Statement (I) is true but Statement (II) is false
(d) Statement (I) is false but Statement (II) is true

Paper-I

31. During measurement of voltage and current in a load, ammeter and voltmeter are
connected in series and across the load respectively. If ammeter and voltmeter positions are interchanged by mistake, then
(a) voltmeter will be damaged, (b) ammeter will be damaged
(c) both the meters will be damaged, (d) both the meters will be safe



58. The concentration of hole-electron pairs in pure silicon at T = 300 K is 7*10^15 per
cubic meter. Antimony is doped into silicon in a proportion of 1 atom to 107 atoms.
Assuming that half of the impurity atoms contribute electrons in the conduction band,
the factor by which the number of charge carries increases due to doping (the number
of silicon atoms per cubic meter is 5*10^28 ) is
(a)14*10^15 , (b) 0.5*10^21 , (c) 2.5*10^21 , (d) 1.8*10^5


105. One of the following can act as an inverse transducer
(a) Electrical resistance potentiometer, (b) LVDT
(c) Piezoelectric crystal, (d) Capacitive transducer

107. A Hall effect transducer is generally used for the measurement of
(a) power, (b) current, (c) displacement, (d) voltage

Ashish, if you don't do your homework, don't read the textbook, and don't listen to the teacher, you will fail your course.
If you get other people to do your homework for you, you won't learn the subject, and you will fail your exams.

We will not be helping you if we do your work for you.

Not too difficult Looks like quite a fair paper to me All multiple choice answers as well cant be that bad obviously as frank says you need to do some homework and studying but in all fairness there are no real trick questions on this paper so you should obtain 80% to 100% if youve done your homework

my answer which i have marked are as follows:
Paper-II-->11(c),20(none option given are correct, answer is x=3,y=1),36(a),73(d),108(a),109(a),118(b)
Paper-I--->31(b),58(c),105(c),107(c)
Please tell me which of my answers are correct and if wrong one please tell me the right answer.

my answer which i have marked are as follows:
Paper-II-->11(c),20(none option given are correct, answer is x=3,y=1),36(a),73(d),108(a),109(a),118(b)
Paper-I--->31(b),58(c),105(c),107(c)
Please tell me which of my answers are correct and if wrong one please tell me the correct answer..

That’s what exams are all about go and ask your tutor That’s what they are there for We don’t sit your exams for you That you do yourselves if you have any questions or you don’t agree with a question you go and discuss this with your tutors with your reasons , answers or discussion groups and you raise that issue with your examiners not us

An essential part of (us) teaching (you) is encouraging and guiding you to work out the answers for yourself.
If we only tell you the answers, you learn nothing, and you can't take us into the exam with you !-)

Paper 1 Q31 Voltmeter & Ammeter. This is the easiest question to work out.
Please draw the circuit and state your reasoning, then we can indicate to you where you are going right or going wrong.
(When you draw this circuit, the answer should immediately be entirely obvious.)