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Q1. | A triangular Pulse of 10 V peak is applied to a capacitor of 0.4 F. The change of the capacitor and its wavefor |

A. | 8 rectangular [Wrong Answer] |

B. | 8 triangular [Wrong Answer] |

C. | 4 triangular [Correct Answer] |

D. | 4 rectangular [Wrong Answer] |

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⇒ The impurity added to extrinsic semiconductor is of the order of

1 in 100

1 in 1000

1 in 100, 0000

1 in 100, 000, 000

⇒ The current due to thermionic emission is proportional to

T

T

^{2}

T

^{3}

T

^{4}

⇒ The resolution of a 12-bit D/A converter using a binary ladder with + 10V as the full scale output will be

2.44 mV

3.50 mV

4.32 mV

5.12 mV

⇒ If the circumference of a spherical target is between 1 to 10 wavelength in a radar system, the situation is called

resonance region

Rayleigh region

optical region

binomial region

⇒ In decimal system the base of radix is

0

1

10

e

⇒ Logarithmic amplifiers are used in

adders

dividers

multipliers

all of the above

⇒ In the circuit of figure, the power consumed in resistance R is measured when one source is acting at one time. These values are 18 W, 50 W and 98 W. When all source act together the maximum and minimum power ca

98 W and 18 W

166 W and 18 W

450 W and 2 W

166 W and 2 W

⇒ Which one of the following bipolar transistors has the highest current gain bandwidth Product (

*f*

_{r}) for similar geometry?

NPN germanium transistor

NPN silicon transistor

PNP germanium transistor

PNP silicon transistor

⇒ In a bipolar junction transistor the base region is made very thin so that

recombination in base region is minimum

electric field gradient in base is high

base can be easily fabricated

base can be easily biased

⇒

Match the following:

List I | List II | ||
---|---|---|---|

A. | bit | 1. | 10 |

B. | nat | 2. | e |

C. | decit | 3. | 2 |

A-1, B-2, C-3

A-1, B-3, C-2

A-3, B-2, C-1

A-2, B-3, C-1

⇒ The bridge is balanced when the value of R is

50 Ω

100 Ω

200 Ω

250 Ω

⇒ The current I

_{CBO}flows in

base and emitter leads

base and collector leads

collector and emitter leads

collector, emitter and base leads

⇒ If V

_{a0}, V

_{a1}, V

_{a2}are sequence components of V

_{a}and I

_{a0}, I

_{a1}, I

_{a2}are sequence components of I

_{a}, then total 3 phase power P is given by

P = V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2}

P = V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2}

^{*}

P = 3(V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2})

P = 3(V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2}

^{*})

⇒ In 8085, TRAP is

always maskable

cannot interrupt a service subroutine

used for catastrophic events like temporary power failure

lowest priority interrupt

⇒ In a power diode the reverse recovery time is the time from the instant the forward current is zero to the instant when reverse recovery current has decayed to

50% of peak reverse current

25% of peak reverse current

10% of peak reverse current

zero value

⇒ The Depth of penetration of EM wave in medium having conductivity σ at a frequency of 1 MHz is 25 cm. The depth of penetration at a frequency of 4 MHz will be

6.25 cm

12.50 cm

50 cm

100 cm

⇒ The access time of a word in 4 MB main memory is 100 ms. The access time of a word in a 32 kb data cache memory is 10 ns. The average data cache bit ratio is 0.95. The efficiency of memory access time is

9.5 ns

14.5 ns

20 ns

95 ns

⇒ For the port shown, the short circuit network function at port 2 is give

*s*+ 1/4

*s*+ 4

4

*s*+ 1

*s*+ 16

⇒ The temperature at which some materials become superconductors is called

Transition temperature

Curie temperature

Neel temperature

Onnes temperature

⇒ In following circuit, steady state is reached with S open, S is closed at

*t*= 0, the current I at

*t*= 0

^{+}is give

9 Ω

6 Ω

7 Ω

10 Ω

⇒ Consider the following DO statement in FORTRAN 77

6

1

8

⇒ 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)

⇒ The given figure shows a constant current source driving a parallel RC circuit. It is equivalen

a lag network

a lead network

a lag-lead network

either (a) or (b)

⇒ Out of multiplexer and demultiplexer, which can be used as a logic function generator?

Multiplexer only

Demultiplexer only

Both

None

⇒ An 8 level encoding scheme is used in a PCM system of 10

*k*H

*z*channel BW. The channel capacity is

80

*kbps*

60

*kbps*

30

*kbps*

18

*kbps*

⇒ A constant

*k*band pass filter has a pass band from 100 to 400 Hz. The resonant frequency of series and shunt arms is

3000 Hz

2500 Hz

2000 Hz

1500 Hz

⇒ 2's complement of a given 3 or more bit number of non-zero magnitude is the same as the original number if all bits except

MSB are zero

LSB are zero

MSB are 1

LSB are 1

⇒ TDM

can be used with PCM only

interleaves pulses belonging to different transmissions

combines five groups into a super group

stacks 24 channels in adjacent frequency slots

⇒ Which of the following is an oscillator with best frequency stability?

Crystal oscillator

Clapp oscillator

Phase shift circuit

Multivibrator

⇒ In FORTRAN 77 the total number of characters in a variable can be a maximum of

6

1

8

9