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Q1. | In a BJT amplifier the power gain from base to collector is 4000. The power gain in dB is |

A. | 3.6 [Wrong Answer] |

B. | 36 [Correct Answer] |

C. | 7.2 [Wrong Answer] |

D. | 72 [Wrong Answer] |

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**Also Read Similar Questions Below :**

⇒ When .4546 E 5 and .5433 E 7 are to be added in normalized floating point mode

none of the numbers is changed to any other form

.4546 E 5 is changed .004546 E 7 and .5433 E 7 is not changed

.5433 E 7 is changed to 54.33 E 5 and .4546 E 5 is not changed

both the numbers are changed and their exponents are made equal to 6

⇒ An inductor filter has a ripple that __________ with load resistance and consequently is used only with relatively __________ load currents.

decreases, low

decreases, high

increases, low

increases, high

⇒ In the spectrum of an FM wave

When modulation index is large, carrier frequency disappears

carrier frequency cannot disappear

amplitude of any side band depends on modulation index

the total number of side bands depend on modulation index

⇒ Consider the following statements :

- Tellegen's theorem is applicable to any lumped networks.
- The reciprocity theorem is applicable to linear bilateral networks.
- Thevenin's theorem is applicable to two- terminal linear active networks.
- Norton's theorem is applicable to two-terminal linear active networks.

1, 2, and 3

1, 2 and 4

1, 2, 3 and 4

3 and 4

⇒ Which of the statement is correct?

*h*and

*g*matrices are inverse of each other

*z*and

*y*matrices are inverse of each other

for reciprocal networks AD - BC = 1

ABCD parameters are used in transistor circuit

⇒ The correct relation between joules and calories is

calories = joules/4.156

joules = calories/4.156

calories = joules x 10

^{7}/4.156

joules = calories x 10

^{7}/4.156

⇒

**Assertion (A):** Dielectric constant is independent of temperature unless the temperature is extremely high.

**Reason (R):** For normal temperatures the number of atoms per unit volume is constant.

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

⇒ The EHT voltage in a picture tube of TV is

about 1000 kV

about 100 kV

about 15 kV

about 1 kV

⇒ In a series circuit with fixed R and variable X

_{L}, the current locus lies in the fourth quadrant.

TRUE

FALSE

⇒ In dc tacho generators used for measurement of speed of shaft, frequent calibration is necessary because

contacts wear off

strength of permanent magnet decreases with age

armature current produces heating effect

there is back emf

⇒ Without any addition circuitry, an 8:1 MUX can be used to obtain.

some but not all Boolean functions of 3 variables

all functions of 3 variables but none of 4 variables

all functions of 3 variables and some but not all of 4 variables

all functions of 4 variables

⇒ The word size accessible at a time from the memory subsystem depends on

width of data bus

width of address bus

width of control bus

both (b) and (c)

⇒ 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

⇒ The binary sum of 111010

_{2}and 11011

_{2}is

1010101

_{2}

1011001

_{2}

1011101

_{2}

1111111

_{2}

⇒ The counter shown in the given figure is built using 4 -ve edge triggered toggle FFs. The FF can be set asynchronously when R = 0. The combinational logic required to realize a modulo-13 counte

F = Q

_{4}Q

_{3}Q

_{2}Q

_{1}

F = Q

_{4}+ Q

_{3}+ Q

_{2}+ Q

_{1}

F = Q

_{4}+ Q

_{3}+ Q

_{2}+ Q

_{1}

F = Q

_{4}Q

_{3}Q

_{2}Q

_{1}

⇒ An n type semiconductor is illuminated by a steady flux of photons with energy greater than the band gap energy. The change in conductivity Δσ obeys which relati

Δσ = 0

Δσ =

*e*(σ

_{n}+ σ

_{p}) Δ

_{n}

Δσ =

*e*(μ

_{n}Δ

_{n}- μ

_{p}Δ

_{p})

Δσ =

*e*μ

_{n}Δ

_{n}

⇒ For the two port of figure,

*z*

_{1126/7 Ω10/3 Ω6 Ω2 Ω}

⇒ Consider a control system shown in given figure. For slight variation in G, the ratio of open loop sensitivity to closed loop sensitivity will be give

1 : (1 + GH)

1 : (1 + GH)

^{- 1}

1 : (1 - GH)

1 : (1 - GH)

^{- 1}

⇒ A trigonometric series has

single sided spectra

zero

sync function

undefined

⇒ Which one of the following can be used for amplification of microwave energy?

TWT

Magnetron

Reflex klystron

Gunn diode

⇒ In radar system if the antenna diameter is increased by a factor of 4, the minimum range will increased by a factor of

1

2

22

4

⇒ In 8085

P flag is set when the result has even parity

P flag is set when the result has odd parity

P flag is reset when the result has odd parity

P flag is reset when the result has even parity

⇒ Which of the following statement is correct?

Decimal 9 is represented as 1011 in Excess-3 code

Decimal 9 is represented as 1001 is BCD code

Decimal 10 is represented as 1100 is Gray code

Decimal 10 is represented as 1001 in binary code

⇒ If A = 0101, then A' is

1010

1011

1001

110

⇒ In a Gunn diode oscillator drift velocity of electron is 10

^{7}cm/s and active region length is 10 x 10

^{-4}cm. The natural frequency of oscillation is

1 MHz

10 MHz

1 GHz

10 GHz

⇒ Which device has one input and many outputs?

Multiplexer

Demultiplexer

Counter

Flip flop

⇒ In a BCD to 7 segment decoder the minimum and maximum number of outputs active at any time is

2 and 7

3 and 7

1 and 6

3 and 6

⇒ The filter circuit for feeding a wooffer has

an inductance in series and capacitance in parallel

a capacitance in series and an inductance in parallel

a resistance in series and an inductance in parallel

an inductance in series and a resistance in parallel

⇒ A potential of 7 V is applied to a silicon diode. A resistance of 1 kΩ is also connected in series. If the diode is forward biased, the current in the circuit is

7 mA

6.3 mA

0.7 mA

0

⇒ A capacitor is needed for an ac circuit of 230 V, 50 Hz the peak voltage rating of the capacitor should be

230 V

0.5 x 230 V

2 x 230V

230/2V