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Q1. | Speech amplifiers are usually operated as |

A. | class A [Correct Answer] |

B. | classes AB [Wrong Answer] |

C. | class B [Wrong Answer] |

D. | class C [Wrong Answer] |

View Answer
Explanation:-
Answer : ADiscuss 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 :**

⇒ Data can be changed from spatial code to temporal code and vice-versa by using

ADC and DAC

shift Register

synchronous counter

timers

⇒ A series circuit has R = 5 Ω and C = 10 μF. It is switched on to a 12 V dc battery at

*t*= 0. The current in the circuit will be maximum

at

*t*= RC

at

*t*= ∞

at

*t*= 0

^{+}

none of the above

⇒ An 8 bit binary number is to be entered into an 8 bit serial shift register. The number of clock pulses required is

1

2

4

8

⇒ An electron for which

*l*= 0 has zero orbital magnetic dipole moment.

TRUE

FALSE

⇒ Which of the following is not a valid integer constant in C (for 16 bit)?

321

-162

-65321

1

⇒ Which one is correct statement?

- Circuit is always open
- Network is always open
- Circuit is always closed
- Network is always closed

1, 2

2, 3

3, 4

1, 4

⇒ F = ∑(0, 3, 4, 5, 7) =

[B ⊕ C] + AC

B'C' + BC + AC

AB + BC + CA

None

⇒ For a binary half subtractor having two inputs

*A*and

*B*the correct sets of logical expressions for the outputs

*D*(

*A*-

*B*) and

*X*= Borrow are

D = AB + AB, X = AB

D = AB AB, X = AB

D = AB + AB, X = AB

D = AB + A B, X = AB

⇒ In a circular waveguide TE

_{21}mode has lowest cutoff frequency

TRUE

FALSE

⇒ Zoning is used with a dielectric antenna in order to

permit pin-point focusing

reduce the bulk of the lens

increase the bandwidth of the lens

correct the curvature of the wavefront from a horn that is too short

⇒ The output resistance of a microphone is 20 ohms. It is to feed a line of impedance 320 ohms. To ensure maximum power transfer, the turn ratio of transformer is

16

256

2

4

⇒ Which of the following is true as regards telephone systems?

A larger facility carrying a larger load operates less efficiently than a smaller capacity

A larger facility carrying a lesser load operates more efficiently than a smaller capacity

A larger facility carrying a larger load operates more efficiently than a smaller capacity

A smaller capacity carrying a larger load operates more efficiently than a larger capacity

⇒ Which of the following can provide a digital signal?

Slow change in the value of a resister

Sine wave

Square wave

Gradual turning of a potentiometer

⇒ The code used to reduce the error due to ambiguity in reading of a binary optical encoder is

Octal code

Excess-3 code

gray code

BCD code

⇒ At a frequency equal to cutoff frequency in a rectangular wave guide

the flow of electromagnetic energy is zero

the flow of electromagnetic energy is infinite

the flow of electromagnetic energy is 50% of maximum

the flow of electromagnetic energy is 10% of maximum

⇒

Match the following:

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

A. | CLP | 1. | Displays DOS version being used |

B. | MSAV | 2. | Partitions hard disk |

C. | F DISK | 3. | Anti-virus program |

D. | VER | 4. | Cleans screen |

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

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

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

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

⇒ Foster Seeley discriminator uses a

double tuned circuit in which primary and secondary are tuned to different frequencies

double tuned circuit in which primary and secondary are tuned to same frequencies

single tuned circuit

three triodes in series

⇒ For the circuit in figure, fed by a unit step voltage,

*v*

_{c1 - e-t/RCe-t/RCet/RC1}

⇒ The current through a resistance

*R*is shown in figure. The computed value of power

400 ± 0.42 W

400 ± 4.6 W

400 ± 8.85 W

400 ± 10.65 W

⇒ The linear transistor circuits always operate in the

saturation

cut off

active

inactive

⇒

Match the following:

List I (Octal) | List II (Decimal number) | ||
---|---|---|---|

A. | 35 | 1. | 53 |

B. | 65 | 2. | 62 |

C. | 54 | 3. | 29 |

D. | 76 | 4. | 44 |

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

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

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

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

⇒ At a particular time it is observed that the frequencies of F layer at Delhi is 3 MHz the maximum electron density is

11 x 10

^{10}

1.1 x 10

^{10}

0.11 x 10

^{10}

11 x 10

^{12}

⇒ In a multicavity klystron amplifier the electron velocity of the order of

10 m/s

10

^{3}m/s

10

^{6}

*m*/

*s*

10

^{12}

*m*/

*s*

⇒

**Assertion (A):** Ionic solids, in general, have no electrical conductivity.

**Reason (R):** In ionic solids, electrons are tightly bound to the nucleus.

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

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

A is true but R is false

A is false but R is true

⇒ In an 8085 microprocessor, the instruction CMP B has been executed while the content of the accumulator is less than that of register B, As a result.

carry flag will be set but zero flag will be reset

carry flag will be reset but zero flag will be set

both carry flag and zero flag will be reset

both carry flag and zero flag will be set

⇒ Which mode has the minimum cutoff frequency in rectangular wave guides?

TE

_{11}

TE

_{10}

TE

_{01}

TE

_{20}

⇒ If the ratio of ac to dc load impedance of a diode detector is low, the result will be

poor AGC operation

poor AF response

negative peak clipping

diagonal clipping

⇒ During transmission over a communication channel, bit errors occur independently with probability P. If a block of

*n*bits is transmitted, the probability of at most one bit error is equal to

1 - (1 - P)

^{n}

P + (

*n*- 1) (1 - P)

*n*P (1 - P)

^{n - 1}

(1 - P)

^{n}+

*n*P (1 - P)

^{n - 1}

⇒ A short grounded vertical antenna has a length L which is 0.05λ at frequency

*f*. If its radiation resistance at

*f*is R ohms, then its radiation resistance at a frequency 2

*f*will be

R/2Ω

RΩ

2RΩ

4RΩ

⇒

Match the following:

List I (Laws of Boolean) | List II (Relation algebra) | ||
---|---|---|---|

A. | Distributive law | 1. | x + x = x |

B. | DeMorgans law | 2. | x(y + z) = xy + xz |

C. | Idempotent law | 3. | (x) = x |

D. | Involution law | 4. | (x + y) = xy |

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

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

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

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