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Q1. | In an ac circuit, the maximum and minimum values of power factor can be |

A. | 2 and 0 [Wrong Answer] |

B. | 1 and 0 [Correct Answer] |

C. | 0 and -1 [Wrong Answer] |

D. | 1 and -1 [Wrong Answer] |

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

⇒ Which two rows represent identical binary numbers?

A second and fourth

Fifth and eight

Third and seventh

Second and third

⇒ Microwave signals transmitted towards the sky are

strongly absorbed by the ionosphere

strongly reflected by the ionosphere

transmitted through the ionosphere

unable to reach the ionosphere because of strong absorption in the lower atmosphere

⇒

Match the following:

List I (Location of characteristics roots) | List II (System characteristic) | ||
---|---|---|---|

A. | (- 1 + j), (- 1 - j) | 1. | Marginally stable |

B. | (- 2 + j), (- 2 - j), (2, j) (- 2, j) | 2. | Unstable |

C. | - j, j - 1, 1 | 3. | Stable |

A-1, B-2, C-3

A-2, B-3, C-1

A-3, B-1, C-2

A-1, B-3, C-2

⇒ In 8085 microprocessor system, what will be the total delay provided by the following loop.

*msec*

3.514

*msec*

2.644

*msec*

3.166

*msec*

⇒ The gain margin of first and second order systems is infinite.

TRUE

FALSE

⇒ For an P-channel enhancement type MOSFET determine the drain current if K = 0.278 x 10

^{-3}A/V

^{2}, V

_{GS}= -4V, V

_{T}= -2V, Voltage equivalent at 27°C = 26 mV.

10 mA

1.11 mA

0.751 mA

46.98 mA

⇒ Which one of the following is an indirect way of generating FM?

Armstrong modulator

Varactor diode modulator

Reactance FET modulator

Reactance bipolar transistor modulator

⇒ In a gate output is Low if and only if all inputs are High. The gate is

OR

AND

NOR

NAND

⇒ The minimum number of comparators required to build an 8 bit flash ADC is

8

63

255

256

⇒ Consider the following features of monochrome TV

- Number of lines per picture 625
- Interlace ratio 2 : 1
- Aspect ratio 4 : 3
- Channel bandwidth 8 MHz

1, 2, 3, 4

1, 2, 3

1, 2, 4

2, 3, 4

⇒ A white noise

*X*(

*t*) with two-sided power spectral density 1 x 10

^{-10}W/Hz is input to a filter whose magnitude squared response is shown be

5 x 10

^{-7}W

1 x 10

^{-6}W

2 x 10

^{-6}W

5 x 10

^{-6}W

⇒ The circuit shown in the figure, with R = 1/3 Ω, L = 1/4H, C = 3F has input voltage

*v*(

*t*) = sin2

*t*. The resulting current

*i*(

*t*

5 sin (2

*t*+ 53.1°)

5 sin (2

*t*- 53.1°)

25 sin (2

*t*+ 53.1°)

25 sin (2

*t*- 53.1°)

⇒ Consider the following statements

- Tellegen's theorem is applicable to any lumped network.
- Reciprocity theorem is applicable to linear bilateral network.
- Thevenin theorem is applicable to two terminal linear active network.
- Norton's theorem is applicable to linear active network.

1, 2 and 3

1, 2, 3 and 4

1, 2 and 4

3 and 4

⇒ For an ideal transformer

only Y parameter exist

only Z parameter

Z, Y both exist

neither Z parameter nor Y parameter exist

⇒ The value of VSWR is taken as ∞ when the line is

short-circuited

open-circuited

terminated with full load

terminated with load equal to the characteristic impedance of the load

⇒ 24 telephone channels, each band limited to 3.4 kHz, are to be time division multiplexed by using PCM, calculate the bandwidth of PCM system for 128 quantization levels and an 8 KHz sampling frequency

192 kHz

2 MHz

1.299 MHz

1.54 MHz

⇒ A blank EPROM has

all bits set to logical 0

all bits set to logical 1

half the total number of bits set to 0 and remaining half to logical 1

either (a) or (b)

⇒ 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

⇒

Match the following:

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

A. | Resistance | 1. | M^{-1}L^{-2}T^{4}I^{2} |

B. | Inductance | 2. | ML^{2}T^{-2}I^{-2} |

C. | Capacitance | 3. | ML^{2}T^{-3}I^{2} |

A-1, B-2, C-3

A-2, B-1, C-3

A-2, B-3, C-1

A-3, B-2, C-1

⇒ In cellphone communication base antennas are connected to other base antennas in

line of sight communication

ionospheric propagation

ground wave propagation

medium wave propagation

⇒ Consider the following in C

- An arithmetic operation between integer and an integer gives integer as the result.
- An arithmetic operation between a real and a real constant gives real constant as the result.
- An arithmetic operation between an integer constant and a real constant is not valid.

All

1 and 2 only

2 and 3 only

1 and 3 only

⇒

Match the following:

List I (BJT amplifier) | List II (Characteristics) | ||
---|---|---|---|

A. | CE | 1. | good voltage gain, good current gain |

B. | CC | 2. | voltage gain less than 1, high current gain |

C. | CB | 3. | current gain less than 1, voltage gain high |

A-1, B-2, C-3

A-1, B-2, C-3

A-3, B-1, C-2

A-3, B-2, C-1

⇒ Two phasors having rms values V

_{1}and V

_{2}which are added to give a phasor having rms value V

_{3}. V

_{3}is maximum if phase angle between V

_{1}and V

_{2}is

90°

180°

270°

360°

⇒ DC tachogenerator can be used in

speed control system

position control system

both (a) and (b)

neither (a) nor (b)

⇒ In FM, the frequency deviation is

always constant

directly proportional to modulating frequency

inversely proportional to modulating frequency

proportional to amplitude of modulating signal

⇒ Which of the following is not necessarily the advantages of a push pull amplifier?

It gives more output

It removes odd a well as even harmonics

There is no effect of ripple of the power supply

It consumes least power

⇒ In

*n*-well CMOS fabrication substrate is:

heavily doped

*n*-type

heavily doped

*p*-type

lightly doped

*n*-type

lightly doped

*p*-type

⇒ If a linear time invartant system is exicited by a pure random signal like white noise, the output of the linear system will have which of the following properties?

Output will be a white noise

Output will be periodic

Output will be random

Output will be correlated or coloured noise

⇒ In a radar, the return echo arrives after the allocated pulse interval. Then

the receiver may be over loaded

the target will appear closer than its actual position

the return echo may interfere with transmitter operation

none of the above

⇒ In a JFET

drain current is very nearly equal to source current

drain current is much less than source current

drain current may be equal to or less than source current

drain current may be even more than source current