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Q1. | The O/P Power of a power amplifier is several times its input power. It is possible because |

A. | power amplifier introduces a -ve resistance [Wrong Answer] |

B. | there is +ve feed back in the circuit [Wrong Answer] |

C. | step up transformer is use in the circuit [Wrong Answer] |

D. | power amplifier converts a part of I/P d.c. power into a.c. power [Correct Answer] |

View Answer
Explanation:-
Answer : DDiscuss 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 :**

⇒ One ampere means the flow of

One coulomb each minute

One electron per second

One coulomb per second

One coulomb each hour

⇒ Which of the following is not a valid arithmetic statement in C?

*x*=

*x*+ 1

*x*=

*y*

^{*}

*z*

*x*

^{*}

*y*=

*z*

*z*=

*y*/

*x*

⇒ A two port network is symmetrical if

*z*

_{11}

*z*

_{12}-

*z*

_{12}

*z*

_{21}= 1

AD - BC = 1

*h*

_{11}

*h*

_{22}-

*h*

_{12}

*h*

_{41}= 1

*y*

_{11}

*y*

_{22}=

*y*

_{12}

*y*

_{21}= 1

⇒ What is the normal range of analog input voltage?

0 to 1 V

0 to 5 V

5 to 15 V

15V to 30V

⇒ Which of the following are included in the architecture of computer?

- Addressing mode, design of CPU
- Instruction set, data format
- Secondary memory, operating system

1 and 2

2 and 3

1 and 3

1, 2 and 3

⇒ A voltage

*v*= 100 sin ω

*t*+ 10 sin 5 ω

*t*is applied to a pure capacitor having capacitance of 1 μF. If ω = 314 rad/sec, the current through the capacitor is

0.0314 cos 314

*t*+ 0.0157 cos 1570

*t*

0.0314 sin 314

*t*+ 0.0157 sin 1570

*t*

0.0314 cos 314

*t*+ 0.0314 cos 1570

*t*

0.0157 cos 314

*t*+ 0.0157 cos 1570

*t*

⇒ Two linearly polarized plane waves

*A*and

*B*travelling in free space in the positive

*x*direction meet at a point. Wave

*A*is polarized in the

*y*direction and the wave

*B*is polarized in the

*z*direction. If the two waves are of equal amplitude and are in phase quadrature, the resultant wave will be

circularly polarized

elliptically polarized

linearly polarized

vertically polarized

⇒ In a flip flop which input determines the state to which output will transistion?

Control input

Clock input

Both control and clock input

Either control or clock input

⇒ The strength of controlled voltage source depends on

value of current elsewhere in the circuit

value of voltage elsewhere in the circuit

value of current or voltage elsewhere in the circuit

none of the above

⇒ Ferrites are

ferromagnetic materials

ferrimagnetic materials

ferroelectric materials

ferri-ferromagnetic materials

⇒ For a transmission line open circuit and short circuit impedances are 20 Ω and 5 Ω. Then characteristic impedance is

100 Ω

50 Ω

25 Ω

10 Ω

⇒ The atomic weight of an atom is determined by

the number of protons

the number of neutrons

the number of protons and neutrons

the number of electrons and protons

⇒ Master control facility (MCF) for INSAT-2 series satellites is located at

Madras

New Delhi

Leh

Hassan

⇒ The component in the given figur

attenuator

T type low pass filter

T type high pass filter

phase shifter

⇒ Equipment using BCD numbers

pocket calculators

electronic counter

digital voltmeters

all of the above

⇒ Parallel wire transmission line is an example of

lumped network

distributed

depend upon I/P signal strength

power I/P

⇒ Figure is a 24 V

_{r}stabilized power supply. The zener is 24 V, 600 mW. The minimum zener current is 10 mA. Proper values R and maximum load current

320 Ω, 10 mA

400 Ω, 15 mA

400 Ω, 10 mA

320 Ω, 15 mA

⇒ Using 4-bit numbers (

*n*= 4) if

*k*= (0011)

_{2}how is

*k*expressed in 2's complement.

(1011)

_{2}

(1101)

_{2}

(1100)

_{2}

(0101)

_{2}

⇒ For a given voltage, four heating coils will produce maximum heat when connected

all in parallel

all in series

with two parallel pairs in series

one pair in parallel with the other two in series

⇒ A magnetron requires an external magnetic field with flux lines parallel to axis of cathode

TRUE

FALSE

⇒ Consider the following statements:

- If any root of characteristic equation has a positive real part the impulse response is unbounded and system is unstable.
- If all the roots of a characteristic equation have negative real parts, the impulse response decays to zero.
- If one or more non-repeated roots of characteristic equation are on
*j*ω axis impulse response is bounded but the system is unstable.

1, 2 and 3

1 and 2 only

1 and 3 only

2 and 3 only

⇒ In 8 cavity magnetron the p mode corresponds to a total phase shift equal to

± 8 p radians around the periphery

± 4 p radians around the periphery

± 2 p radians around the periphery

± 16 p radians around the periphery

⇒ Binary number 11011.01 when converted to its 2's complement will become

101.11

1111.1

1100.1

100.11

⇒ A circuit is fed by two sources of different frequency and magnitudes 100 ∠0° V and 50 ∠30°V. The current in a particular branch is 10 ∠20° A. If the magnitudes of the sources are changed to 200 ∠0° V and 100 ∠0° V, the current in that branch should be

20 ∠20° A

10 ∠20° A

14.14 ∠20° A

10 ∠- 20° A

⇒ The average value of wave in figur

90 V

75 V

60 V

50 V

⇒ As compared to the number of network elements in Brune synthesis, the number of network elements Bott-and Duffin in realization is

more

less

equal

any of the above

⇒ Adder is a combinational logic circuit.

TRUE

FALSE

⇒

Match the following:

List I (Form) | List II (Network) | ||
---|---|---|---|

A. | Cauer I | 1. | L in series arm and C in shunt arm of ladder |

B. | Cauer II | 2. | C in series arm and L in shunt arm of ladder |

C. | Foster I | 3. | Series combination of L and C in parallel |

D. | Foster II | 4. | Parallel combination of L and C in series |

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

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

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

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

⇒ Consider the following statements regarding electromagnetic flowmeter

- AC excitation is used to avoid polarisation of fluid.
- The meter calibration is changed as viscosity of fluid changes.
- Stainless steel pipes can be used for measuring the flow of liquid of high conductivity.

1, 2, 3 are correct

1 and 2 are correct

2 and 3 are correct

1 and 3 are correct

⇒

**Assertion (A):** The propagation delay in ECL is minimum

**Reason (R):** Transistors used in ECL switch between active and cutoff regions.

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