## NIELIT Junior Teachnical Assistant_2016_march

Please wait while the activity loads.

If this activity does not load, try refreshing your browser. Also, this page requires javascript. Please visit using a browser with javascript enabled.

If this activity does not load, try refreshing your browser. Also, this page requires javascript. Please visit using a browser with javascript enabled.

Question 1 |

The addition of p-type impurity to intrinsic material creates allowable energy levels

slightly above conduction band | |

slightly below conduction band | |

slightly above valence band | |

slightly below valence band |

Question 2 |

Measurement of Hall coefficient enables the determination of

temperature coefficient | |

recovery time of stored carrier | |

Fermi level | |

type of conductivity and concentration of charge carriers |

Question 3 |

The diffusion current is proportional to

applied electric field | |

concentration gradient of charge carriers | |

square of electric field | |

cube of applied electric field |

Question 4 |

For generating 1 MHμ frequency signal, the most suitable circuit is

phase shift oscillator | |

weinbridge oscillator | |

colpilt’s oscillator | |

audio oscillator |

Question 5 |

In a two stage CE amplifier circuit, the ac collector resistance of the first stage depends on

the input impedance of first stage | |

the input impedance of second stage | |

load resistance only | |

none of the above |

Question 6 |

Class C amplifier is suitable for

a narrow frequency band | |

audio frequency | |

a wide frequency band | |

all the signals |

Question 7 |

For input voltage of V

_{m} sin net, peak inverse voltage rating needed for diode in a half wave rectifier using capacitor filter isV _{m} | |

2V _{m} | |

V _{m}/√2 | |

V _{m} /π | |

None of Above |

Question 8 |

For a BJT, α and β are related to

β =α/(1−α) | |

β =α/(1+α) | |

β =1/(1+α) | |

α=β/(1+β) |

Question 9 |

Which of the following has lowest propagation delay ?

ECL | |

TTL | |

PMOS | |

CMOS |

Question 10 |

The number of address lines in a memory chip of size 8 192 × 8 is

8 | |

12 | |

13 | |

16 |

Question 11 |

The minimum number of two input NAND gates required to implement the Boolean function μ = ABC is

2 | |

3 | |

5 | |

6 |

Question 12 |

Which of the following input combination is not desirable for SR flip flop ?

S = 0, R = 0 | |

S = 0, R = 1 | |

S = 1, R = 0 | |

S = 1, R = 1 |

Question 13 |

Power spectral density of white noise

is constant with frequency | |

increases with frequency | |

decreases with frequency | |

varies exponentially with frequency |

Question 14 |

The VHF frequency range is

30 to 300 KHμ | |

3 to 30 MHμ | |

30 to 300 MHμ | |

300 to 3000 MHμ |

Question 15 |

Vestigial sideband is most commonly used in

radio | |

telephony | |

television transmission | |

all of the above |

Question 16 |

In a uniform plane wave E and H are related by

E / H = 1 | |

E/H =√ ∈/μ | |

E / H = π | |

E / H = √ μ / ∈ |

Question 17 |

A current signal is given by i (t) = 20e

^{ −50t}. The initial and final value of current are0 and 20 | |

20 and 0 | |

0 and 10 | |

20 and 10 |

Question 18 |

The buffer amplifier should have

low output impedance and low input impedance | |

low output impedance and high input impedance | |

high output impedance and low input impedance | |

high output impedance and high input impedance |

Question 19 |

Mesh analysis is applicable to only

non-planar network | |

planar network | |

circuits containing voltage sources | |

circuits containing current sources |

Question 20 |

When a reverse bias is applied to a P-n junction the width of the depletion layer:

Remains the same | |

Is increased | |

Is decreased | |

May increase or decrease |

Question 21 |

Common emitter configuration is preferred when main criterion is

Voltage gain | |

Current gain | |

Both voltage gain and current gain | |

Input impedance |

Question 22 |

The potential divides method of biasing is employed in amplifiers in order to

Reduce the cost of the circuit | |

Reduce the dc base circuit | |

Limit the input ac signal going to the base | |

Make the operating point almost independent of β |

Question 23 |

The maximum efficiency of class B amplifier is

25% | |

50% | |

78.5% | |

88% |

Question 24 |

In frequency modulation

The frequency of the carrier remains constant | |

The amplitude of the carrier remains constant | |

The amplitude of the carrier wave is varied | |

The frequency of the carrier is made equal to the signal frequency |

Question 25 |

Two’s complement of a binary number 1010 is

0101 | |

0101 | |

0110 | |

1001 |

Question 26 |

The number of flip-flops required in a decade counter is

2 | |

3 | |

4 | |

10 |

Question 27 |

An 8-bit digital to analog converter has a maximum output voltage of 2v. If input voltage is 1.5v, the digital output at the end of conversion will be

0001 1111 | |

0110 0001 | |

1111 1000 | |

1100 0000 |

Question 28 |

Which of the following can be used for accurate and stable time base circuit in a digital frequency meter ?

Quartz | |

Carbon | |

Aluminium | |

Copper |

Question 29 |

An inductor

Allows a.c. to pass but blocks d.c. | |

Allows d.c. to pass but blocks a.c. | |

Allows a.c. and d.c. to pass | |

Blocks d.c. as well as a.c |

Question 30 |

Two resistors R

_{1}= 60KΩ and R_{2}= 12KΩ are connected in parallel. Their effective resistance is5 K Ω | |

60 Ω KΩ | |

12 K Ω | |

10 K Ω |

Question 31 |

An electric machine will have high efficiency when

Input / output is low | |

Reactive power is more | |

KWh consumption is low | |

Losses are low |

Question 32 |

The demand factor for the electrical system is the ratio of

Max demand to connected load | |

Max demand to average load | |

Average power to max power | |

Reactive power to total power |

Question 33 |

Which of the following theorems is a manifestation of the law of conservation of energy

Tellegen’s theorem | |

Reciprocity theorem | |

Thevenin’s theorem | |

Norton theorem |

Question 34 |

Voltage across capacitor in RLC series circuit is maximum

At resonance | |

Just before resonance | |

Just after resonance | |

Much after resonance |

Question 35 |

Which of the following is the most economical method of starting a single phase motor

Resistant start method | |

Inductance start method | |

Capacitance start method | |

Split phase method |

Question 37 |

A 1 mA ammeter has a resistance of 100 ᘯ . It is to be converted to a 1 A ammeter. The value of shunt resistance is

0.001ᘯ | |

0.1001ᘯ | |

100000ᘯ | |

100ᘯ |

Question 38 |

When two resistance are connected in parallel, they have

Same resistances value | |

Same voltage across them | |

Same current passing through them | |

Different resistance value |

Question 39 |

In wave connected windings, the number of poles is

A=2 | |

A=4 | |

A=6 | |

A=8 |

Question 40 |

Power consumed by purely inductive circuit is

VI | |

VIcosx | |

VI sinx | |

Zero |

Question 41 |

If integer needs two by storage, then maximum value of an unsigned integer is

2 ^{16} − 1 | |

2 ^{15} − 1 | |

2 ^{16} | |

2 ^{15} |

Question 42 |

The data flow model of an application mainly shows

the underlying data and the relationships among them | |

processing requirements and the flow of data | |

decision and control information | |

communication network structure |

Question 43 |

In airline reservation system, the entities are date, flight number, place of departure, destination, type of plane and seats available. The primary key is

flight number | |

flight number + place of departure | |

flight number + date | |

flight number + destination |

Question 44 |

Determine the number of page faults when references to pages occur in the occur -1, 2, 4, 5, 2, 1, 2, 4. Assume that the main memory can accommodate 3 pages and the main memory already has the pages 1 and 2, with page 1 having been brought earlier than
page 2. (Assume LRU algorithm is used)

3 | |

5 | |

4 | |

none of the above |

Question 45 |

The only state transition that is initiated by the user process itself is

block | |

dispatch | |

wakeup | |

none of the above |

Question 46 |

The word ‘format’ in formal languages means

the symbols used have well-defined | |

they are unnecessary, in reality | |

only the form of the string of symbols is significant | |

none of the above |

Question 47 |

Pick the correct statements The logic of Pumping lemma is a good example of

the Pigeon-hole principle | |

the divide and conquer technique | |

recursion | |

iteration |

Question 48 |

Any string of terminals that can be generated by the following CFG

S ⟶ XY

X ⟶ aX | bX | a

Y ⟶ Ya | Yb |a

S ⟶ XY

X ⟶ aX | bX | a

Y ⟶ Ya | Yb |a

has at least one b | |

should end in an ‘a’ | |

has no consecutive a’s or b’s | |

has at least two a’s |

Question 49 |

The first operating system used in microprocessor is

Zenix | |

DOS | |

CP/M | |

Multics |

Question 50 |

The sequence of events that happen during a typical fetch operation is

PC ⟶ Mar ⟶ Memory ⟶ MDR ⟶ IR | |

PC ⟶ Memory ⟶ MDR ⟶ IR | |

PC ⟶ Memory ⟶ IR | |

PC ⟶ MAR ⟶ Memory ⟶ IR |

Question 51 |

The addressing mode used in an instruction of the form ADD X Y, is

absolute | |

immediate | |

indirect | |

index |

Question 53 |

A high speed communication equipment typically would not be needed to

E-mail | |

transferring large volume of data | |

supporting communication between nodes in a LAN | |

all of the above |

Question 54 |

The _______ measures the number of lost or garbled messages as a fraction of the total sent in the sampling period.

Residual Error rate | |

Transfer failure probability | |

Connection release failure probability | |

Connection establishment failure probability |

Question 55 |

The middle term in the expansion of ( x/3 + 9 y )

^{10}1 890 x ^{5} y^{ 5} | |

6 1236 x ^{5} y^{ 5} | |

3 77810 x ^{ 5} y^{ 5} | |

6 2136 x ^{5} y^{ 5} |

Question 56 |

The second, third and fourth terms in the binomial expansion (x + a ) and 240, 720 and 1080 respectively. Then, x , a and n are :

x = 3 , a = 3 , n = 5 | |

x = 2 , a = 3 , n = 4 | |

x = 2 , a = 3 , n = 5 | |

x = 3 , a = 2 , n = 5 |

Question 58 |

Given y = arctan(tanh x) dy/dx = ?

1/cosh 2x | |

1/sinh 2x | |

1/(1+tanh ^{2} x) | |

None of the above |

Question 59 |

On the parabola y = x

^{2}find the point N least distant from the straight line y = 2 x − 4N (2, 4 ) | |

N (1, 1 ) | |

N (1, 2 ) | |

N (− 1 , 1 ) |

Question 60 |

For the function f (x) = x

^{2}+ x − 1 , there exists a value x = c in the interval [ − 1 , 1 ] where f′(c) = 0 , then c is equal to(√5 − 1 )/2 | |

(√5 + 1 )/2 | |

( − √5 − 1 )/2 | |

( − √5 + 1 )/2 |

Question 61 |

Three lines 3 x + y − 2 = 0 , p x + 2 y − 3 = 0 and 2 x − y − 3 = 0 intersect at a point. Then, the value of p is

-7 | |

2 | |

5 | |

-11 |

Question 62 |

The equation of the plane through the point ( − 1 , 3 , 2 ) and perpendicular to each of the planes x + 2 y + 3 z = 5 and 3 x + 3 y + z = 0 is

7 x − 8 y + 3 z + 2 5 = 0 | |

7 x + 8 y + 3 z + 2 5 = 0 | |

7 x − 8 y + 3 z − 2 5 = 0 | |

7 x − 8 y − 3 z − 2 5 = 0 |

Question 63 |

∫(xe

^{x}/(1+x)^{2}) equals to(xe ^{x} /(1+x)) | |

x/(1+x) | |

e ^{x}/(1+x)^{2} | |

e ^{x}/(1+x)^{3} |

Question 67 |

tan

^{−1}( √3 ) − cot^{−1}(− √3 ) equals to0 | |

2√3 | |

−π/2 | |

π |

Question 68 |

The vector magnitude 9 and perpendicular to both the vectors and is

Question 69 |

If a is a real number and n is a positive integer then

Question 70 |

Solution of the differential equation x (dy/dx) + y = y

^{2}is given byy − 1 = c xy | |

y = c xy − 1 | |

x y = 1 + c x | |

y + 1 = c xy |

Question 71 |

For the curve y = x e x the point

x = − 1 is a minimum | |

x = 0 is a minimum | |

x = − 1 is a maximum | |

x = 0 is a maximum |

Question 76 |

In the following questions, there are four groups of letters in each. Three of these groups are alike in same way while one is different. Find the one that is different and will be your answer as well.

asibu | |

oarse | |

oinak | |

zamol |

Question 77 |

In the following questions, there are four groups of letters in each. Three of these groups are alike in same way while one is different. Find the one that is different and will be your answer as well.

DAG | |

GJM | |

NKQ | |

VSY |

Question 78 |

In the following questions, there are four groups of letters in each. Three of these groups are alike in same way while one is different. Find the one that is different and will be your answer as well.

ira | |

aam | |

kas | |

btd |

Question 79 |

yxz | |

cbd | |

nmo | |

pqo |

Question 80 |

AiiR | |

MooX | |

VxxZ | |

DecY |

Question 81 |

Select the related letter/word/number/figure from the given alternatives.
BJNT : CIOS :: DHPV : ?

EGQU | |

EIQW | |

ELPV | |

EIOU |

Question 82 |

Select the related letter/word/number/figure from the given alternatives.
KIJM : QOPS :: MKLO : ?

LMOR | |

OMNS | |

KMOQ | |

SQRU |

Question 83 |

If DELHI is coded as 73541 and CALCUTTA as 82589662, how can CALICUT be coded?

5279431 | |

5978213 | |

8251896 | |

8543691 |

Question 84 |

If in a code language PRINCIPAL is written as MBOQSOMVW and TEACHER is written as FDVSZDB, how is CAPITAL written in that code?

SVMOFVW | |

SVMODVW | |

BVMODVW | |

SVMIDVW |

There are 84 questions to complete.