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Q1. | When a series RL circuit is switched on to a dc voltage, the rate of change of current is maximum at t = 0. |

A. | TRUE [Correct Answer] |

B. | FALSE [Wrong Answer] |

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

⇒ If poles lie in first quadrant, damping ratio is

1

more than 1

less than 1

zero

⇒ Which of the following represents a stable system?

- Impulse response decreases exponentially.
- Area within the impulse response in finite.
- Eigen values of the system are positive and real.
- Roots of the characteristic equation of the system are real and positive.

1 and 4

1 and 3

2, 3 and 4

1, 2

⇒ Which of the following is the main difference between waveguide and transmission line?

Waveguides cannot be coupled to coaxial lines

Waveguides have no standing wave ratio

Transmission line does not suffer from the effect of low cut off frequency

Waveguides are not distributed like transmission lines

⇒ The symbol in figure is

UJT

PUT

SCS

SBS

⇒ In figure, the time constant for the capacitor chargin

6 μ

*s*

10 μ

*s*

15 μ

*s*

25 μ

*s*

⇒ In a second order system with a unit step input, the speed of response is high if system is

overdamped

undamped system

critically damped

underdamped

⇒ As compared to TTL, CMOS logic has

higher speed of operation

higher power dissipation

smaller physical size

all of the above

⇒ Let JCOKE = 3 and LPEPSI = 5. Consider the statement

1

15

10

⇒

Match the following:

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

A. | Fourier transform of a Gaussian function | 1. | Gaussian function |

B. | Convolution of a rectangular pulse with itself | 2. | Rectangular pulse |

C. | Current through inductor for step input voltage | 3. | Triangular pulse |

4. | Ramp function | ||

5. | Zero |

A-1, B-2, C-3

A-2, B-4, C-5

A-1, B-3, C-4

A-2, B-3, C-5

⇒ The PIV of a bridge rectifier is less than that of full wave rectifier with centre tapped transformer.

TRUE

FALSE

⇒ In the following transistor circuit

*V*

_{BE}= 0. 7 V,

*r*= 25mV/I

_{c}_{E}, and β and the capacitance are very l

-180

-120

-90

-60

⇒ Computer virus can hide itself in a diskette but not in a hard disk.

TRUE

FALSE

⇒ 1 dB is equal to __________ nepier

8.6

6.8

8

0

⇒ The Boolean expression for the sub-class (Q) of all electronic instruments which are measuring instruments or are non-digital instruments with battery supply is

Q = X(Y + Z)

Q = X + YZ

Q = XY + Z

Q = XY + Z

⇒ For a two- port reciprocal network, the output open circuit voltage divided by the input current is equal to

B

Z

_{12}

1/

*y*

_{12}

*h*

_{12}

⇒ Which of following antenna not produces circular polarisation?

Helical

Parabolic

Disc

Yagi

⇒

**Assertion (A):** In a BCD to 7 segment decoder the number of outputs active at one time is always the same.

**Reason (R):** A decoder can be used to interface BCD input to LED display.

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 true, R is false

A is false, R is true

⇒ When R and C are connected in parallel, phase angle of Y is positive.

TRUE

FALSE

⇒ A silicon controlled switch has :

2 leads

3 leads

4 leads

5 leads

⇒ To evaluate X = (A + B + 1.2) * (A + B - C) the sequence of operation is

+ + + - * =

* + + + - =

+ + - * + =

- + + + * =

⇒ Twelve 1 Ω resistance are used as edges to form a cube. The resistance between two diagonally opposite corners of the cube is

5/6 Ω

1 Ω

6/5 Ω

3/2 Ω

⇒ Which statement out of the following statement is wrong?

Attenuation of satellite signals by rain and fog varies almost inversely with the angle of elevation

At 12/4, GHz link frequencies, signal power loss due to rain and fog is much greater than at 4/6 GHz frequencies

The distance between satellite and Earth station varies slightly with angle of elevation

At present 4/6 GHz geostationary satellites are being parked in geosynchronous, orbits at least 10° apart

⇒

Match the following:

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

A. | Output of signal generator | 1. | Modulated |

B. | Error signal from a synchro | 2. | Digital |

C. | Output of a JK flip flop | 3. | Analog |

D. | Signal received by radar | 4. | Stoichastic |

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

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

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

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

⇒ Which of the following statement is false?

The gate of DMOSFET may be biased positively, zero or negatively

N-channel enhancement-only MOSFET conducts only when its gate is highly positive

JFET has lower input impedance than MOSFET

The bipolar base is forward biased, JFET gate must also be forward biased

⇒ An inverting voltage feedback is a

voltage amplifier

current amplifier

current to voltage converter

voltage to current converter

⇒ Vestigial sideband is most commonly used in

radio transmission

television transmission

telephony

all of the above

⇒ The function Y = A B C + AB C + A B C + A BC is to be realized using discrete gates. The inputs available are A, B, C. We need a total of

8 gates

6 gates

10 gates

5 gates

⇒ Turn off time of a transistor switch is equal to (where

*t*

_{s}is storage time and

*t*

_{f}is fall time.)

*t*

_{s}+

*t*

_{f}

*t*

_{s}-

*t*

_{f}

2

*t*

_{s}

2

*t*

_{f}

⇒ In class C operation of an amplifier circuit, the collector current exists for

360° of input wave

180° of input wave

more than 180° of input wave

less than 180° of input wave

⇒ The accuracy of measurement by ohmmeter is very good.

TRUE

FALSE