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Q1. | Thermistor has a positive temperature coefficient. |

A. | TRUE [Wrong Answer] |

B. | FALSE [Correct Answer] |

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Explanation:-
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**Also Read Similar Questions Below :**

⇒ In a polyatomic gas, the types of polarization which exist together are

electronic and orientational

electronic and ionic

ionic and orientational

electronic, orientational and ionic

⇒ In a NOT gate the output is always the opposite of the input.

TRUE

FALSE

⇒ An antenna has 40 Ω resistance and 60 Ω radiation resistance. The efficiency of the antenna is

0.3

0.4

0.5

0.6

⇒ The A.C. resistance of the emitter diode will be

5.05 Ω

50.5 Ω

505 Ω

5050 Ω

⇒ In intrinsic semiconductor, the fermi level

lies at the centre of forbidden energy gap

is near the conduction band

is near the valence band

may be anywhere in the forbidden energy gap

⇒ If F(

*j*ω) is the Fourier transform of

*f*(

*t*), then

£

*f*(-

*t*) = F(

*j*ω)

£

*f*(-

*t*) = F* (

*j*ω)

£

*f*(-

*t*) = F(-

*j*ω)

£

*f*(-

*t*) = F* (

*- j*ω)

⇒ Let JCOKE = 3 and LPEPSI = 5. Consider the statement

1

15

10

⇒ Which of the following devices has the 'negative resistance' characteristic?

Reflex klystron

Gunn diode

P-N-P transistor

Magnetron

⇒ As the atoms of rare gases become larger, electronic polarizability

increases

decreases

remains the same

may increase or decrease

⇒ A silicon diode is forward biased and total applied voltage is 5 V. The voltage across

*p*-

*n*junction is

5 V

Slightly less than 5 V

0.7 V

0

⇒ A land line telemetry system is suitable for distance upto

about 1 km only

about 10 km only

about 100 km only

any of the above

⇒ The effective electrical length of an antenna is __________ its physical length

greater than

equal to

less than

none of the above

⇒ Consider the following statements

- Fading of signals is generally greatest near radio horizon.
- Fading of signals is generally greatest in shadow zone.
- Fading is small when a good optical path is present.

1, 2 and 3

1 and 2 only

1 and 3 only

2 and 3 only

⇒ Self impedance is

same for transmitting (T

_{t}) and receiving antenna (T

_{r})

T

_{t}> T

_{r}

T

_{r}> T

_{t}

no relation

⇒ A decade counter

counts for ten days

counts ten times faster than a binary counters

counts to 9 and reset on the next pulse

reverts on the pulse after the tenth

⇒ In a klystron amplifier dc electron velocity is

*v*

_{0}and dc electron charge density is r

_{0}the dc beam current is

r

_{0}

*v*

_{0}

r

_{0}

^{/}

*v*

_{0}

*v*

_{0}

^{/}r

_{0}

(

*v*

_{0}

^{/}r

_{0})

^{2}

⇒ In the given figure

*f*(

*t*) is an even funct

TRUE

FALSE

⇒ The network has 10 nodes and 17 branches. The number of different node power voltages would be

7

9

10

45

⇒ In a P type silicon sample, the hole concentration is 2.25 x 10

^{15}/ cm

^{3}. If the intrinsic carrier concentration is 1.5 x 10

^{10}/ cm

^{3}the electron concentration is

zero

10

^{10}/cm

^{3}

10

^{5}/cm

^{3}

1.5 x 10

^{25}/cm

^{3}

⇒ The output voltage of 5-bit D/A binary ladder that has a digital input of 11010 (Assuming 0 = 0 V and 1 = + 10 V) is

3.4375 V

6.0 V

8.125 V

8.6875 V

⇒ For an

*m*x

*n*matrix A, the eigen values are the roots of the characteristic equation

|I - A|

|λI - A| = 0

|λA - I| = 0

|A - I| = 0

⇒ Figure is a 24 V

_{r}stabilized power supply. The zener is 24 V, 600 mW. The minimum zener current is 10 mA. Proper values R and maximum load current

320 Ω, 10 mA

400 Ω, 15 mA

400 Ω, 10 mA

320 Ω, 15 mA

⇒

**Assertion (A):** For a given system only one of the static error constants is finite and significant.

**Reason (R):** If finite static error constant is large, the loop gain becomes smaller as ω approaches zero.

Both A and R are correct and R is correct explanation of A

Both A and R are correct but R is not correct explanation of A

A is correct but R is wrong

R is correct but A is wrong

⇒ A rare gas has N atoms per m

^{3}. If electronic polarizability of single atom of this gas is a

_{e}, then

∈

_{r}= Na

_{e}

∈

_{0}∈

_{r}= Na

_{e}

∈

_{0}(∈

_{r}- 1) = Na

_{e}

∈

_{0}(∈

_{r}- 2) = Na

_{e}

⇒ If the number of ways an event may result ins analysed into

*m*successes and

*n*failures, each equally likely to occur, the probability of success in a single trial is

*m*(

*m*+

*n*)

TRUE

FALSE

⇒ In the circuit of figure both diodes are ideal. If

*v*

_{1}= 10 V and

*v*

_{2}= 10 V which diode will cond

D

_{1}only

D

_{2}only

Both D

_{1}and D

_{2}

Neither D

_{1}nor D

_{2}

⇒ The circuit shown in figure, will act as an ideal current source with respect to terminals A and B, when frequenc

zero

1 rad/s

4 rad/s

16 rad/s

⇒ An op-amp is fed from a signal source through resistance R

_{1}. If it is to work as sign changer, the feedback resistance R

_{f}should be

equal to R

_{1}

twice R

_{1}

half R

_{1}

either (b) or (c)

⇒ The following sequence represents autocorrelation of a real valued signal. The energy of real valued sequence is given by __________

*x(n)*= {1, _, 3, _, 5, _, 7, _, 9, 10, _, 8, _, 6, _, 4, _, 2

2[1

^{2}+ 2

^{2}+ 3

^{2}+ 4

^{2}+ 5

^{2}+ 6

^{2}+ 7

^{2}+ 8

^{2}+ 9

^{2}] + 10

^{2}

10

10

^{2}

2[1

^{2}+ 2

^{2}+ 3

^{2}+ 4

^{2}+ 5

^{2}+ 6

^{2}+ 7

^{2}+ 8

^{2}+ 9

^{2}+ 10

^{2}]

⇒ Quality factor will be

*a*/

*b*

*b*/

*a*

*b*/

*a*

*ab*