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Q1. | In a 3 phase semiconverter, the firing frequency is |

A. | equal to line frequency [Wrong Answer] |

B. | 3 times the line frequency [Correct Answer] |

C. | 6 times the line frequency [Wrong Answer] |

D. | 12 times the line frequency [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 :**

⇒ The early effect in BJT is caused by

fast turn on

fast turn off

large collector base reverse bias

large emitter base forward bias

⇒ In a CD, the depth and width of each pit is

0.5 μm each

0.5 μm and 1 mm respectively

1 μm and 0.5 mm respectively

1 μm each

⇒ Computer communication networks have

star configuration

tree configuration

loop/mesh configuration

All of the above

⇒

Match the following:

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

A. | RF amplifier | 1. | Amplifier received carrier and sidebands |

B. | Loudspeaker | 2. | Gives acoustic output |

C. | Demodulator | 3. | Has IF input and AF output |

D. | IF amplifier | 4. | Fixed-tuned to intermediate frequency |

A-1, B-2, C-3, D-4

A-2, B-1, C-3, D-4

A-3, B-4, C-1, D-2

A-1, B-4, C-3, D-2

⇒ To produce magnetic flux, mmf is necessary.

TRUE

FALSE

⇒ In an R-L circuit, the impedance is 30 Ω at a frequency of 100 Hz. At 200 Hz, the impedance should be

30 Ω or more

60 Ω or more

15 Ω or less

more than 30 Ω but less than 60 Ω

⇒ Which of the following instruments is used almost exclusively to measure radio frequency currents?

Moving coil

Rectifier

Moving iron

Thermocouple

⇒ Mobility of electrons and holes are equal.

TRUE

FALSE

⇒ If there are M equally likely and independent messages and M = 2

^{N}where N is an integer, the information in each message is equal to

N bits

0.5 N bits

2 N bits

4 N bits

⇒ Out of the three transforms viz. Z-transform, Laplace transform and Fourier transform

all three are used in continuous time domain

all three are used in both continuous time domain and discrete time domain

Z transform is used in continuous time domain while Laplace and Fourier transforms are used in discrete time domain

Z transform is used is discrete time domain while Laplace and Fourier transforms are used in continuous time domain

⇒ The noise figure of multicavity klystron amplifier is very low

TRUE

FALSE

⇒ When P

_{c}is the unmodulated carrier power and P

_{t}is the total power in the modulated wave, then the maximum power in AM wave is

P

_{t}= 1.5 P

_{c}

P

_{t}= 2.5 P

_{c}

P

_{t}= 2

P

_{t}= 22 P

_{c}

⇒ In a bipolar transistor which current is smallest

collector current

base current

emitter current

any of the three currents

⇒ For the system in the given figure. The transfer function C(

*s*)/R(

*s*

G

_{1}+ G

_{2}+ 1

G

_{1}G

_{2}+ 1

G

_{1}G

_{2}+ G

_{2}+ 1

G

_{1}G

_{2}+ G

_{1}+ 1

⇒ A FET has

very high input resistance

very low input resistance

high connection emitter junction

forward biased PN junction

⇒ The "boundary sphere" between antenna region and free space region appears to "opaque"

along the dipole axis

along perpendicular direction

along the dipole axis as well as perpendicular direction

neither along the dipole axis nor along the perpendicular direction

⇒ Logic analyser is

a multichannel oscilloscope

similar to logic pulser

similar to current tracer

none of the above

⇒ The maximum permissible distance between two samples of a 10 kHz signal

100 μ sec

50 μ sec

10 μ sec

none

⇒ For the output F to be 1 in the logic circuit shown, the input combination shoul

A = 1, B = 1, C = 0

A = 1, B = 0, C = 0

A = 0, B = 1, C = 0

A = 0, B = 0, C = 1

⇒ If PRIN = 200.0 and BINT = 0.0525 the result of expression

`INCOME = PRIN * (1 + BINT)`

will be210

210.5

210.5

210.5

⇒ Consider the following statement in Fortran 77

4 values would be read and stored in X (0), X (1), X (2), X (3)

5 values would be read and stored in X (0), X (1), X (2), (3)(4)

5 values would be read and stored in X (I), X (2), X (3), X (4), X (5)

⇒ Wienbridge oscillator uses

-ve feedback

+ve feedback

both +ve, -ve feedback

feedback is not required

⇒ The snubber circuit consists of

a capacitor connected in series with thyristor

a capacitor connected in parallel with thyristor

a resistor and capacitor in series connected across thyristor

none of the above

⇒ Lead becomes a superconductor at

9.1 K

7 K

5 K

3 K

⇒ An AC source or RMS voltage 20V with internal impedance Z

_{s}= (1 + 2

*j*) Ω feeds a load of impedance Z

_{L}= (7 + 4

*j*) Ω in the figure below. The reactive power consumed by the loa

8 VAR

16 VAR

28 VAR

32 VAR

⇒ The ripple factor of power supply is a measure of

its filter efficiency

diode rating

its voltage regulation

purity of power output

⇒ In the self biasing scheme (R

_{F}across collector to base) of BJT, S

_{1}tends to unity by __________ R

_{C}is the collector load Resistance.

increasing R

_{F}

decreasing R

_{F}

decreasing R

_{F}and increasing R

_{C}

increasing R

_{F}and decreasing R

_{C}

⇒ As compared to dimensions of most feeds, the skin depth at microwave frequencies is

of the same magnitude

much larger

much smaller

either (b) or (c)

⇒

Match the following:

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

A. | TV | 1. | 1 kHz |

B. | Radio | 2. | 3 kHz |

C. | Telephony | 3. | 9 kHz |

D. | Telegraphy | 4. | 5 MHz |

A-4, B-1, C-2

A-4, B-3, C-2

A-2, B-1, C-3

A-1, B-2, C-3

⇒ In a photo emissive device and emission efficiency is increased by

coating the cathode ray by an active materials

coating the cathode by an insulating material

heating the cathode

cooling the anode