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Q1. | Consider the differential amplifier shown in figure. (Assume β is very hi |

A. | 1 MΩ [Wrong Answer] |

B. | 100 kΩ [Wrong Answer] |

C. | 15 kΩ [Correct Answer] |

D. | ≈ 0 [Wrong Answer] |

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

⇒ A function

*f*(

*t*) =

*k*

*e*

^{at}is __________ for (a > 0).

stable

unstable

marginal

none

⇒ In disc mounting of SCR

SCR is clamped on one side of disc shaped heat sink

SCR is clamped between two disc shaped heat sinks

The SCR has low current rating

None of the above

⇒ In intrinsic semiconductor magnitude of free electron and hole concentrations are equal.

TRUE

FALSE

⇒ The voltage

*e*

_{o}indicated in the figure has been measured by an ideal voltmeter. Which of the following can be calcula

Bias current of inverting input only

Bias current of inverting and non-inverting inputs only

Input offset current only

Both the bias currents and the I/P offset current

⇒ An astable multivibrator circuit using IC 555 timer is shown below. Assume that the circuit is oscillating stea

3 V to 5 V

3 V to 6 V

3.6 V to 6 V

3.6 V to 5 V

⇒ In figure, the effective capacitance between A and

2 μF

4 μF

8 μF

10 μF

⇒ Thyristors are suitable for dc circuit breakers but not for ac circuit breakers.

TRUE

FALSE

⇒ A voltage wave containing 10% third harmonic is applied to a scries R-L circuit. The percentage third harmonic content in the current wave will be

more than 10%

10% or less than 10%

less than 10%

10% or more or less

⇒ Which is the dominant mode in rectangular waveguides?

TE

_{10}

TE

_{11}

TE

_{01}

TM

_{11}

⇒

Match the following:

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

A. | Flash converter ADC | 1. | requires conversion time of a few μs |

B. | Dual slope ADC | 2. | requires DAC |

C. | Successive approximation ADC | 3. | minimizes the effect of power supply interference |

4. | requires complex hardware | ||

5. | is a tracking ADC |

A-2, B-3, C-4

A-4, B-3, C-2

A-5, B-4, C-3

A-1, B-2, C-5

⇒ For low impedance SAW filter the most suitable material for substrate of SAW filter is

PZT ceramics

ZnO

Lithium titanate

Lithium neobate

⇒ The statement

`IMPLICIT INTEGER (A - F)`

in FORTRAN identifiesall variable names which begin with A, B, C, D, E or F as being of integer type

all character names which begin with A, B, C, D, E, or F as being of integer type

all variable names which begin with A and have 6 characters

none of the above

⇒ Which of the following is a passive component?

Semiconductor devices

Vacuum tube devices

Capacitors

All of the above

⇒ In a four variable K map eight adjacent cells give

single variable term

two variable term

three variable term

four variable term

⇒ The poles of an RC function

are simple and lie or negative real axis

are simple and lie on ω axis

must be complex conjugate

may be anywhere on

*s*plane

⇒ In a moving iron voltmeter the coil has a resistance of 20 Ω and an inductance of 0.3 H. The swamping resistance in 2000 Ω. To ensure correct reading with dc as well as 50 Hz ac, the value of capacitor to be connected in parallel with swamping resistance should be

0.0125 μF

0.0311 μF

0.0521 μF

0.0622 μF

⇒ The probability giving distribution of electrons over a range of allowed energy levels is known as

Maxwell's Distribution

Fermi-Dirac Distribution

Richardson Dushman Distribution

none of the above

⇒ In a microprocessor

all instructions need only one machine cycle

some instructions need only one machine cycle while some other instructions need more than one machine cycle

all instructions need only fraction of one machine cycle

some instructions need less than one machine cycle

⇒ A voltage V

_{BB}is applied across the terminals of a UJT. The emitter voltage at peak point is

hV

_{BB}

(h + 1) V

_{BB}

hV

_{BB}+ V

_{D}

V

_{D}

⇒ Coulomb friction is

the force of sliding friction between dry surfaces

the force of friction between moving surfaces separated by viscous fluid

the force required to initiate motion between two contacting surfaces

all of the above

⇒ An earth mat for a communication tower consists of

one or two radials extending from base of tower at a depth of about 5 cm below ground

a large number of radials extending from base of tower at a depth of about 3 m

a large number of radials extending from base of tower at a depth of about 30 cm

none of the above

⇒ Consider the voltage transfer characteristic of a standard CMOS inve

NMOS and PMOS triode

Both are saturation

NMOS saturated PMOS linear

None of these

⇒ The ac collector current is nearly equal to

ac base current

ac signal current

ac supply current

ac emitter current

⇒ The main advantage of CC amplifier is

High input impedance and low output impedance

Low input impedance and high output impedance

High voltage gain

High current gain

⇒ The self bias provides

stable Q point

large voltage gain

high input impedance

high base current

⇒ A broadside array operating at 100 cm wavelength consist of 4 half-wave dipoles spaced 50 cm apart. Each element carries radio frequency current in the same phase and of magnitude 0.5 A. The radiated power will be

196 W

73 W

36.5 W

18.25 W

⇒ The synthesis of minimum function was suggested by

O'Brune

R. Richards

Bott and Duffin

none of the above

⇒ What is the propagation constant for air filled wave guide with dimensions

*a*= 1.59" and

*b*= 0.795" at 4.95 GHz. The wave impedance is

400.94 Ω

562.94 Ω

502.80 Ω

492.80 Ω

⇒ The total number of channels allotted for cellular telephone is

666

333

221

111

⇒ The p mode of operation of magnetron signifies that

the phase difference between adjacent anode poles is p radians

the phase difference between adjacent anode poles is a multiple of p radians

the total phase shift around the periphery is p radians

none of the above