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Q1. | A unit step function is used to represent the closing a switch in a constant voltage system. |

A. | TRUE [Correct Answer] |

B. | FALSE [Wrong Answer] |

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

⇒ A single phase half wave regulator uses

2 diodes and 2 thyristors

2 thyristors

1 diode and 1 thyristor

2 diodes

⇒ Stability factor for S is given by for a fixed bias

1 + β

1 - β

1/β

β - 1

⇒ Effective address is calculated by adding or subtracting displacement value to

immediate address

Relative address

absolute address

base address

⇒ Bandwidth for practical PCM system is (where

*n*is no. of channels, N length of PCM codes)

2

*n*N

*f*Hz

_{m}4

*n*

*f*Hz

_{m}2

*n*

*f*

_{m}(N + 1)

*f*

_{m}⇒ In a radio receiver, the local oscillator is tuned to a frequency

lower than the incoming frequency

higher than the incoming frequency

equal to incoming frequency

any of the above

⇒ In radar PRF depends on maximum range.

TRUE

FALSE

⇒ A λ/4 long high frequency transmission line is terminated into one impedance Z

_{R}. If Z

_{0}be the characteristic impedance of the line, then input impedance Z

_{in}is

Z

_{o}Z

_{R}

Z

^{2}

_{R}/Z

_{o}

Z

^{2}

_{0}/Z

_{R}

Infinity

⇒ A single mode fibre not suffer from which type of dispersion?

Waveguide dispersion

Material dispersion

Intermodal dispersion

Polarization mode dispersion

⇒ In a CE amplifier the dc load line is the same as ac load line when

ac collector resistance and dc collector resistance are equal

ac collector resistance and dc emitter resistance are equal

ac collector resistance is very high

ac collector resistance is one half of dc collector resistance

⇒ As the number SWG increases, area of cross-section decreases.

TRUE

FALSE

⇒ 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

⇒ In the figure, the

emits light when both S

_{1}and S

_{2}are closed

emits light when both S

_{1}and S

_{2}are open

emits light when only S

_{1}and S

_{2}is closed

does not Emit light, irrespective of the switched positions

⇒ Examine the following truth table. The product of sum from this truth tabl

(X + Y) (X + Y)

(X + Y) (X + Y)

(X + Y) (X + Y)

(X + Y) (X + Y)

⇒ Symmetrical square wave of time period 100 μs can be obtained from square wave of time period 10 μs by using

divide by 5 circuit

divide by 2 circuit

divide by 5 circuit followed by divide by 2 circuit

BCD counter

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

1 MΩ

100 kΩ

15 kΩ

≈ 0

⇒ The scale of hot wire instrument is linear.

TRUE

FALSE

⇒ Assume that op-amp in figure is ideal. If input V

_{i}is triangular, the output V

_{0}wil

square wave

sine wave

triangular wave

parabolic wave

⇒ In a second order system ω

*= 10 rad/sec and ζ = 0.1, then ω*

_{n}_{d}=

9.1 rad/sec

9.95 rad/sec

9 rad/sec

1 rad/sec

⇒ The directivity in a receiving antenna

- increases the intercept area in forward direction
- reduces the noise picked up from other sources
- provides a means of discriminating against undesired signals originating in directions other than in which the desired transmitter lies.

1 only

1 and 2 only

1, 2 and 3

2 and 3 only

⇒ De-emphasis circuit is used

to attenuate high frequencies

to attenuate low frequencies

to attenuate mid-band frequencies

None of the above

⇒

**Assertion (A):** Inverse Laplace transform can be found from P(*s*) by inversion integral.

**Reason (R):** The function f(*t*) is assumed to be zero for *t* < 0.

Both A and R are correct and R is correct explanation of A

Both A and R are correct but R is not correct explanation of A

A is correct but R is wrong

R is correct but A is wrong

⇒ Four sig

2

*f*

_{0}

3

*f*

_{0}

4

*f*

_{0}

8

*f*

_{0}

⇒ A typical value of

*g*

_{m}for a FET is about 25 μs.

TRUE

FALSE

⇒ In 8085 microprocessor, the RST 5.5 interrupt service routine start from location

0020 H

0024 H

0028 H

002 CH

⇒

**Assertion (A):** An electronic tuner uses varactor diode

**Reason (R):** The capacitance of a varactor diode depends on the magnitude of reverse bias.

Both A and R are correct and R is correct explanation of A

Both A and R are correct but R is not correct explanation of A

A is correct but R is wrong

A is wrong but R is correct

⇒ A rectifier voltmeter using bridge rectifier and PMMC meter is calibrated to read rms value of sine wave. A triangular wave is applied to it and it reads 6.82 V. The rms value of triangular wave is

about 6.82 V

about 7.1 V

about 6.5 V

about 10 V

⇒

Match the following:

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

A. | Total instantaneous value of emitter current | 1. | I_{E} |

B. | Quiescent value of emitter current | 2. | i_{E} |

C. | Instantaneous value of as component of emitter current | 3. | I_{e} |

D. | RMS value of ac component of emitter current | 4. | i_{e} |

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

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

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

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

⇒ The electric field of an EM wave propagating in the

*z*direction given

linearly polarized in z direction

elliptically polarized

left hand circularly polarized

right hand circularly polarized

⇒ Which of the following is incorrect?

(8)

_{16}= (8)

_{8}

(5)

_{16}= (5)

_{8}

(8)

_{2}= (2)

_{10}

(2)

_{16}= (2)

_{10}

⇒ In an hydrogen atom, an electron moves in the field of a proton. The stability of orbit requires equilibrium between coulomb's force and centrifugal force.

TRUE

FALSE