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Q1. | The disadvantage of transformer coupling in amplifier is |

A. | cost of transformer at audio frequencies [Wrong Answer] |

B. | size of transformer at audio frequencies [Wrong Answer] |

C. | size of transformer at radio frequencies [Wrong Answer] |

D. | cost and size of transformer at audio frequencies [Correct Answer] |

View Answer
Explanation:-
Answer : DDiscuss 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 :**

⇒ A potential difference is developed across a current carrying metal strip when the strip is placed in a transverse magnetic field. The above effect is known as

Fermi's effect

Photo electric effect

Joule's effect

Hall's effect

⇒ A discrete time linear shift-invariant system has an impulse response

*h*[

*n*] with

*h*[0] = 1, h[1] = - 1,

*h*[2] - 2, and zero otherwise. The system is given an input sequence

*x*[

*n*] with

*x*[0] -

*x*[2] - 1, and zero otherwise. The number of nonzero samples in the output sequence

*y*[

*n*], and the value of

*y*[2] are, respectively

5, 2

6, 2

6, 1

5, 3

⇒ Wave guides are pressurised above normal atmospheric pressure for

increasing the power handling capacity

improving conductivity of walls

preventing higher modes from propagation

varying the wave impedance

⇒ Fermi level in intrinsic semiconductor is at the centre of forbidden energy band.

TRUE

FALSE

⇒ In a single phase semi-converter the number of thyristors is

16

8

4

2

⇒ In voltage amplifiers, the load resistance

should be a small as possible

should be as large as possible

must be equal to output impedance

must be half of output impedance

⇒ The minimum energy of a photon required for intrinsic excitation is equal to

energy of bottom of conduction band

energy of top of valence band

forbidden gap energy

Fermi energy

⇒ The intrinsic carrier concentration of silicon sample at 300 K is 1.5 x 10

^{16}/m

^{3}. If after doping, the number of majority carriers is 5 x 10

^{20}/m

^{3}. The minority carrier density is

4.5 x 10

^{11}/m

^{3}

3.33 x 10

^{4}/m

^{3}

5 x 10

^{20}/m

^{3}

3 x 10

^{-5}/m

^{3}

⇒

Match the following:

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

A. | PMMC | 1. | Square law type scale |

B. | Moving iron | 2. | Very good response |

C. | Thermo-couple | 3. | Linear scale |

D. | Electrostatic | 4. | Voltmeter |

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

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

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

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

⇒ The resistance of a metallic wire would

increase as the operating frequency increase

decrease as the operating frequency increase

remain unaffected on increasing the operating frequency

first increase then decrease

⇒ In a two phase servomotor the voltages applied to the two stator windings

are equal in magnitude and are in phase

are unequal in magnitude but are in phase

are equal in magnitude but have a phase difference of 90°

are unequal in magnitude and have a phase difference of 90°

⇒ If a system is to follow arbitrary inputs accurately the bandwidth should be

large

small

very small

neither small nor large

⇒ An iron specimen has µ

_{r}= 1000 when B = 0.3 T. If B = 0.35 T, µ

_{r}

will be 1000

will be less than 1000

will be more than 1000

may be more or less than 1000

⇒ During amplitude modulation, the phase angle of the modulating voltage changes by

0°

45°

90°

180°

⇒ Armstrong FM transmitter uses

LC oscillator

crystal oscillator

RC oscillator

either (a) or (c)

⇒ In forward active region, the operation of a BJT

both junctions are forward biased

both junctions are reverse biased

emitter base junction is forward biased and base collector junction is reverse biased

emitter base junction is reverse biased and base collector junction is reverse biased

⇒ For an

*m*-derived filter, attenuation is infinite when

*f*=

*f*

_{∞}.

TRUE

FALSE

⇒ A virtual ground is a ground for

voltage

current

both voltage and current

voltage but not for current

⇒ The width of air gap on recording head in a tape recorder is about

6 micron

3 micron

1 micron

25 micron

⇒ The value of the integral of the function g(

*x, y*) = 4

*x*

^{3}+ 10

*y*

^{4}along the straight line segment from the point (0, 0) to the point (1, 2) in the x-y plane is

33

35

40

56

⇒ Electrical contact materials used in switches, brushes, relay must possess

high thermal conductivity and high melting point

low thermal conductivity and low melting point

high thermal conductivity and low melting point

low thermal conductivity and high melting point

⇒ In given figure a silicon diode is carrying a constant current of 1 mA. When the temperature of the diode is 20°C, V

_{D}is found to be 700 mV. If the temperature rises to 40°C, V

_{D}becomes approximately equa

747 mV

660 mV

680 mV

700 mV

⇒ A difference amplifier using op-amp has closed loop gain = 50. If input is 2 V to each of inverting and non-inverting terminals, output is 5 mA. Then CMRR =

20000

2000

200

20

⇒ A 6 bit R-2

*R*ladder D/A converter has a reference voltage of 6.5 V. It meets standard linearity then resolution in percent and volts.

3% 7 V

6.4 V, 2%

0.1%, 1.57 V

1.57%, 0.1 V

⇒ Pagemaker is an application software for DTP.

TRUE

FALSE

⇒ A sinusoidal signal is measured by CRO. The scale is set at 4 mV/cm. If vertical distance between positive and negative peaks is 6 cm, the peak value of ac signal is

6 mV

12 mV

24 mV

3 mV

⇒ A magnet does not attract

nickel

iron

copper

iron and copper

⇒ The spectrum of the white noise and an impulse function is similar in following aspects

both have similar magnitude spectrum

both have similar magnitude and Phase spectrum

no relation

similar phase spectrum

⇒ A vacant electronic state moves in the same direction as would a positive charge carrier.

TRUE

FALSE

⇒

Match the following:

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

A. | Evanescent wave | 1. | Pattern multiplication |

B. | Skip distance | 2. | Mismatched transmission line |

C. | Return loss | 3. | Propagation in lossy medium |

D. | Antenna array | 4. | Short wave propagation |

5. | Propagation below cut-off |

A-5, B-2, C-4, D-3

A-2, B-4, C-1, D-5

A-5, B-4, C-2, D-1

A-1, B-3, C-4, D-5