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Q1. | In a transistor amplifier, the reverse saturation current I_{CO} |

A. | Doubles for every 10°C rise in temperature [Correct Answer] |

B. | Doubles for every 20°C rise in temperature [Wrong Answer] |

C. | Increase 100°C with temperature [Wrong Answer] |

D. | Doubles for every 5°C rise in temperature [Wrong Answer] |

View Answer
Explanation:-
Answer : ADiscuss it below :!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ The coefficients F

_{n}in the exponential form of Fourier series are

independent of frequency

functions of frequency

even function of frequency

odd functions of frequency

⇒ Which of the following microphones is the cheapest?

Moving coil

Condenser

Ribbon

Carbon

⇒ In a Hurwitz polynomial

all coefficients are non-negative

the coefficients may be positive or negative

all coefficients are negative

all coefficients are non-negative and all zeros should be either in left half plane or simple on the imaginary axis

⇒ The rule that resistivity of conductors can be separated into two parts viz. temperature independent and temperature dependent is known as

Matthiessen's rule

Debye rule

Curie rule

Onne's rule

⇒ In 8085 microprocessor the value of the most significant bit of the result following the execution of any arithmetic or Boolean instruction is stored in

the carry status flag

the auxiliary carry status flag

sign status flag

zero status flag

⇒ MUF is highest in periods of greatest sunspot activity.

TRUE

FALSE

⇒ Which multivibrator can be used as a clock timer?

Astable multivibrator

Bistable multivibrator

Any of the above

None of the above

⇒ S

_{i}transistor of following figure has a = 0.9 and I

_{CE}= 0, V

_{EE}= 5 V and V

_{CC}= 13 V, then R

_{E}will be if I

_{EQ}=

3 kΩ

4 kΩ

5 kΩ

4.3 kΩ

⇒ Which of these is the most recent display device?

LED

LCD

VF

(a) and (c)

⇒ The initial contents of

`ACC and CY`

in 8085 are - CY = 1
- ACC = 10000001

After instruction `RAL`

is executed once the contents of `CY and ACC`

respectively will be1 and 00000011

0 and 00000011

1 and 00000001

0 and 00000001

⇒ A signal is sampled at 8 kHz and is quantized using 8 bit uniform quantizer. Assuming SNR

_{q}for a sinusoidal signal, the correct statement for PCM signal with a bit rate of

*R*is

R = 32 KbPs, SNR

_{q}= 25.8 dB

R = 64 KbPs, SNR

_{q}= 49.8 dB

R = 64 KbPs, SNR

_{q}= 58.8 dB

R = 32 KbPs, SNR

_{q}= 49.8 dB

⇒ A capacitor stores 0.15C at 5 V. Its capacitance is

0.75 F

0.75 μF

0.03 F

0.03 μF

⇒ (62)

_{10}in binary system is

110000

111100

111110

111111

⇒ Which device has internal positive feedback?

Two cavity klystron amplifier

Multi-cavity klystron amplifier

Reflex klystron amplifier

All of the above

⇒ A radio station works at 800 kHz and uses AM. If this is a public broadcast system, it should transmit using

parabolic reflector to transmit all round

turnstile antenna for the required land

half wave long horizontal wave

a vertical antenna less than quarter for practical reasons

⇒ Three analog signals, having bandwidths 1200 Hz, 600 Hz, 600 Hz are sampled at their Nyquist rates, encoded with 12 bit words, and time division multiplexed. The bit rate for the multiplexed signal is

115.2 kbps

28.8 kbps

57.6 kbps

38.4 kbps

⇒

**Assertion (A):** The root locus of a control system is symmetrical about real axis.

**Reason (R):** For all polynomials with real coefficients, complex poles always occur in conjugate pairs.

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

⇒ The Z parameters Z

_{11}and Z

_{21}for the 2-port network in the fig

Z

_{11}= - 6/

_{11}Ω; Z

_{21}= 16/

_{11}Ω

Z

_{11}= 6/

_{11}Ω; Z

_{21}= 4/

_{11}Ω

Z

_{11}= 6/

_{11}Ω; Z

_{21}= - 16/

_{11}Ω

Z

_{11}= 4/

_{11}Ω; Z

_{21}= 4/

_{11}Ω

⇒ The operating voltage of a megger is about

100 V

12 V

6 V

1 V

⇒ The probability density function of the envelope of narrow band noise is :

Uniform

Gaussian

Rayleigh

None

⇒ A generator is feeding power to a transmission line of characteristic impedance Z

_{0}. The line is terminated in impedance Z

_{L}. Standing waves will be set up if

Z

_{L}= Z

_{0}

Z

_{L}< Z

_{0}

Z

_{L}> Z

_{0}

both (b) and (c)

⇒ In the given figure the input frequency

*f*= 10(1/2 p

0 dB

3 dB

-3 dB

-20 dB

⇒

*x*= AX + B

*u*is a state equation.

TRUE

FALSE

⇒ Crossover distortion behaviour is characteristic of

class A O/P stage

class B O/P stage

class AB output stage

common pulse O/P state

⇒ A capacitor is needed for an ac circuit of 230 V, 50 Hz the peak voltage rating of the capacitor should be

230 V

0.5 x 230 V

2 x 230V

230/2V

⇒ The number of valence electrons in a silicon atom is

4

2

1

0

⇒ 8085 data bus has 8 lines and is bidirectional.

TRUE

FALSE

⇒ The upper and lower side frequencies for 3 kHz audio modulation with a 27 MHz carrier frequency will be

30 and 24 MHz

27.3 and 26.7 MHz

27.3 and 26.97 MHz

27.3 and 26.97 MHz

⇒ Which of the following figures is an ideal equivalent circuit of a n-p-n transis

figure A

figure B

figure C

none

⇒ Figure shows a pole zero plot of I(

*s*). The likely current response in time domai

*i*(

*t*) =

*e*

^{-1}-

*e*

^{-3t}

*i*(

*t*) =

*e*

^{-1}- 2

*e*

^{-2t}

*i*(

*t*) =

*e*

^{-1}-

*e*

^{-2t}

*i*(

*t*) =

*e*

^{-1}-

*e*

^{-4t}