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Q1. | In operational Amplifier, Common mode voltage gain should be |

A. | 0 [Correct Answer] |

B. | ∞ [Wrong Answer] |

C. | 1 [Wrong Answer] |

D. | 0.5 [Wrong Answer] |

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

⇒ A conductor has a cylindrical shape with a diameter

*d*. Its resistance is 2 Ω. It is recast into a cylindrical conductor of diameter 0.3

*d*. The resistance of new conductor is likely to be

less than 2 Ω

less than 0.6 Ω

between 2 and 100 Ω

more than 100 Ω

⇒ The useful operational life of INSAT-IB (launched in 1983) is expected to end by

1992-93

1991-92

1989-90

1993-94

⇒ If the current in a capacitor leads the voltage by 80°, the loss angle of capacitor is

80°

10°

100°

170°

⇒ Which of the following statement is wrong?

A depletion type N-channel MOSFET conducts even when V

_{GS}= 0

A BJT is very sensitive to radiation whereas FET is relatively immune

Bipolars need higher supply voltage than FETs

Both N-channel as well as

*p*-channel JFETs work in the depletion mode

⇒

*h*parameters are used in transistor analysis.

TRUE

FALSE

⇒ If output power of a radio receiver is doubled, its volume is increased by __________ dB.

2

3

1

-3

⇒ Which of these statements is correct?

Ridge guide is essentially a form of capacitively loaded guide.

Ridge guide is essentially a form of inductively loaded guide.

Ridge guide is essentially a form of resistively loaded guide.

Ridge guide has higher power handling capacity than rectangular waveguide.

⇒ In a vibrating reed frequency meter the natural frequency of two adjacent reeds have a difference of

0.25 Hz

0.5 Hz

1.25 Hz

1 Hz

⇒ Which of the following is a valid real constant?

-81.56

73

10254,1

42

⇒ In a bistable multivibrator, commutating capacitors are used to

increase the base storage charge

provide ac coupling

increase the speed of response

alter the frequency of the output

⇒ The number of memory locations in which 14 address bits can access is

1024

2048

4096

16384

⇒ The unit of ∇ x H is

Ampere

Ampere/meter

Ampere/m

^{2}

Ampere-meter

⇒ An FM transmitter delivers 80W to a load of 30 W when no modulation is present. The carrier is now frequency modulated by a single sinusoidal signal and the peak frequency deviation is so adjusted to make the amplitude of the second sideband is zero in the given out

5.12 W

21.78 W

2.56 W

16.81 W

⇒ It

*f*(

*t*) is an odd function, the coefficients F

*in the exponential form of Fourier series*

_{n}are real

are imaginary

are complex

may be real or imaginary

⇒ For representing two sinusoidal voltages on a phasor diagram

Both voltages must be of the same frequency

Both voltages must be sinusoidal but may be of different frequencies

One of the voltages must be of 50 Hz

The frequency of one must be integral of that of other

⇒ The voltage in a circuit follows the law

*v*= 100 sin ω

*t*if the frequency is 25 Hz, how long will it take for the voltage to rise to 50 volts?

1/150

*s*

1/100

*s*

1/300

*s*

1/600

*s*

⇒ An image uses 512 x 512 picture elements. Each element can take any of eight distinguishable levels. The maximum entropy in the above image will be

2097152 bits

786432 bits

648 bits

144 bits

⇒ Discrete transistors T

_{1}and T

_{2}having maximum collector current rating of 0.75 amp are connected in parallel as shown in the figure, this combination is treated as a single transistor to carry a total current of 1 ampere, when biased with self bias circuit. When the circuit is switched on, T

_{1}draws 0.55 amps and T

_{2}draws 0.45 amps. If the supply is kept on continuously, ultimately it is very likely

Both T

_{1}, and T

_{2}get damaged

Both T

_{1}, and T

_{2}will be safe.

T

_{1}Will get damaged and T

_{2}will be safe

T

_{2}will get damaged and T

_{1}, will be safe.

⇒ Identify which of the following is not a tree of the graph shown in fi

*bcgh*

*defg*

*abfg*

*aegh*

⇒ In a 4 bit ripple counter using flip flops with

*t*= 40 ns, the maximum frequency can be

_{pd}1.25 MHz

3.25 MHz

6.25 MHz

12.5 MHz

⇒ Which gives minimum probability of error?

ASK

FSK

PSK

DPSK

⇒ When a diode is not conducting, its bias is

forward

zero

reverse

zero or reverse

⇒ Which of the following element has four valence electrons?

Silicon

Germanium

Both (a) and (b) above

None of the above

⇒ A signal

*x*

_{1}(

*t*) and

*x*

_{2}(

*t*) constitute the real and imaginary parts respectively of a complex valued signal

*x*(

*t*). What form of waveform does

*x*(

*t*) possess?

Real symmetric

Complex symmetric

Asymmetric

Conjugate symmetric

⇒ For a depletion type NMOS, V

*= - 4 volts. For V*

_{p}_{GS}= 0, 1

_{D}= 16 mA in the pinch off region of V

_{DS}. For V

_{GS}= - 2, the value of I

_{D}in the pinch off region of V

_{DS}is given by

64 mA

32 mA

16 mA

4 mA

⇒

Match the following:

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

A. | SSB Modulation | 1. | Transmission line |

B. | Δ . B = 0 | 2. | Hilbert transform |

C. | Model dispersion | 3. | Faraday's law |

4. | Absence of magnetic monopoles | ||

5. | Waveguides | ||

6. | Phase locked loop |

A-1, B-3, C-5

A-5, B-4, C-2

A-6, B-4, C-5

A-2, B-4, C-5

⇒ In a 3 phase fully controlled converter the firing frequency is

3 times the line frequency

6 times the line frequency

9 times the line frequency

12 times the line frequency

⇒ When a ferromagnetic substance is magnetised, there are small changes in its dimensions. This phenomenon is called

hysteresis

magnetostriction

diamagnetism

bipolar relaxation

⇒ The unit of loudness is

phon

sone

decibel

mel

⇒ For measurement of high voltage capacitors the suitable bridge is

Wien bridge

modified De Sauty bridge

Schering bridge

either (a) or (b)