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Q1. | In brushless excitation system of modern alternators, the main exciter is |

A. | dc generator [Wrong Answer] |

B. | ac generator [Correct Answer] |

C. | either dc or ac generator [Wrong Answer] |

D. | induction generator [Wrong Answer] |

View Answer
Explanation:-
Answer : BDiscuss 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 :**

⇒ For the design of a sequential circuit having 9 states, minimum number of memory elements required is

3

4

5

9

⇒ A full wave bridge diode rectifier uses diodes having forward resistance of 50 ohms each. The load resistance is also 50 ohms. The voltage regulations is

0.2

0.5

1

2

⇒ An R-C coupled amplifier has mid-frequency gain of 200 and a frequency response from 100 Hz to 20 kHz. A negative feedback network with β = 0.2 is incorporated into the amplifier circuit, the Bandwidth will be

50 kHz

20 kHz

100 kHz

infinite

⇒ For a given voltage, four heating coils will produce maximum heat when connected

all in parallel

all in series

with two parallel pairs in series

one pair in parallel with the other two in series

⇒ If C is thermal capacitance,

*m*is mass of liquid and

*c*is specific heat, then

C =

*mc*

*c*=

*m*C

*m*=

*c*C

C = (

*mc*)

^{2}

⇒ Which of the following is not considered as a useful quantity in comparing noise performance of receivers?

Noise temperature

Noise figure

Noise resistance

Input noise voltage

⇒ Which of the following cannot be the Fourier series expansion of a periodic signal?

*x*(

*t*) = 2 cos

*t*+ 3 cos 3

*t*

*x*(

*t*) = 2 cos pt + 7 cos

*t*

*x*(

*t*) = cos

*t*+ 0.5

*x*(

*t*) = 2 cos 1.5p

*t*+ sin 3.5 p

*t*

⇒ In figure, the transmission parameters are A = C = 1, B = 2 and D = 3. Then Z

_{in12/13 Ω13/12 Ω3 Ω4 Ω}

⇒ The maximum number of AM broadcast stations that can be accommodated in a 100 kHz bandwidth for the highest modulating frequency of 5 kHz will be

100

20

10

1

⇒ Which of the following is basically a voltage controlled capacitance?

Zener diode

Diode

Varactor diode

LED

⇒ A nickel cadmium cell is an alkaline cell.

TRUE

FALSE

⇒ The attenuation factor in parallel plane guides is given by

a = power lost/power transmitted

a = 2 x power lost/power transmitted

a = power lost per unit length/2 x power transmitted

a is always constant

⇒ In a normally biased N-P-N transistor the main current crossing the collector junction is

a drift current

a hole current

a diffusion current

same as the base current

⇒ The problem of logic race occurs in

SOP functions

POS functions

Hybrid function

SOP and POS functions

⇒ The forms of IF statements in FORTRAN 77 are called

logical IF and Block IF

logical IF, block IF and arithmetic IF

logic IF, block IF, arithmetic IF and negate IF

logical IF and arithmetic IF

⇒ An ideal op-amp requires

zero input offset voltage

low input offset voltage

high input offset voltage

infinite input offset voltage

⇒ Percentage increase in the reverse saturation current of a diode if the temperature is increased from 25°C to 50°C

0.5

5

5.657

5.756

⇒ In a CE bipolar transistor operating in active region, collector current is independent of

V

_{CE}

I

_{B}

both V

_{CE}and I

_{B}

none of the above

⇒ Read the following statements about 8085

`RAL`

instruction rotates`ACC`

contents left by 1 bit- When
`RAL`

instruction is executed once the binary number gets doubled `STC`

means set`CY`

to 1

1 and 2 only

1, 2 and 3 only

1, 2 and 4 only

1 and 4 only

⇒ In the circuit of figure the voltage across C at

*t*= 0

^{+0 V20 Vvery large7.5 V}

⇒ A 4 cm by 3 cm rectangular waveguide with air cavity, is operating at 12 GHz with TE

_{11}mode. The cut-off frequency is:

6.25 GHz

4.75 GHz

1.5 GHz

8.75 GHz

⇒ Watthour meter is an integrating instrument

TRUE

FALSE

⇒ Figure shows basic Hartley oscillator configuration. Do you think the polarities marked for the split coiled are corr

yes they are

no they are not

it really doesn't matter

none of the above

⇒ Conversion rate, for a successive approximation ADC which uses 2 MH

*z*clock and 5 bit binary ladder containing 8 VV reference voltage is __________ .

64516.12

*conversions/sec*

400000

*conversions/sec*

400000

*bps*

2.5

*bps*

⇒ The baud rate is

always equal to the bit transfer rate

equal to twice the bandwidth of an ideal channel

not equal to the signalling rate

equal to one half the bandwidth of ideal channel

⇒ Which of the following antennas is λ /4 length?

Dipole

Marconi

Monopole

Parabolic

⇒ A Wien bridge is suitable for

audio frequencies only

radio frequencies only

both audio and radio frequencies

very low frequencies only

⇒ Linear diode detector utilizes

linear portion of static characteristics of diode

linear portion of dynamic characteristic of diode

square law portion of dynamic characteristics of diode

rectification property of diode

⇒ In an FM signal, the power

increases as the modulation index increases

reduces as the modulation index increase

increases as the modulation index decreases

remains constant when the modulation index increases

⇒ Consider the following DO statement in Fortran 77

11

10

4