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Q1. | In all base driver amplifiers |

A. | ac collector voltage is 180° out of phase with ac base voltage [Correct Answer] |

B. | ac emitter voltage is 180° out of phase with ac base voltage [Wrong Answer] |

C. | ac collector voltage is in phase with ac base voltage [Wrong Answer] |

D. | none of the above [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 :**

⇒ PA radar means

Phased Array radar

Pulsed Array radar

Pulse Amplitude radar

None of the above

⇒ For the minterm designation Y = ∑ m (1, 3, 5, 7) the complete expression is

Y = A BC + A B C

Y = A B C + A B C + ABC + A BC

Y = A B C + A B C + ABC + A BC

Y = A B C + ABC + A BC + A BC

⇒

Match the following:

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

A. | Serial Binary adder | 1. | (2n - 1)t_{pd} |

B. | Ripple carry adder | 2. | (n - 1)t_{pd} |

C. | Carry look ahead binary adder | 3. | Operation time independent of size |

4. | 6t for 4 bit carry look ahead adder_{pd} |

A-2, B-1, C-3

A-2, B-1, C-4

A-1, B-2, C-4

A-1, B-2, C-3

⇒ The reverse saturation current in a semiconductor diode consists of

avalanche current

zener current

minority carrier current

minority carrier current and surface leakage current

⇒ Figure shows an RC circuit. The magnitude plot V

_{2}/V

_{1will rise exponentially to R2/(R1 + R2) as ω → ∞will rise linearly to R2/(R1 + R2) as ω → ∞will decrease to zero as ω → ∞will rise 1 at ω = 0 and then decrease as ω → ∞}

⇒ Two transistors have same value of a but different gain (G) bandwidth (B) product. The transistors have similar geometry. However one of them is germanium and the other is silicon. The transistor with lower GB product

is germanium

is silicon

may be either of two

cannot be identified on the basis of above data

⇒ When a reverse bias is applied to a

*p*-

*n*junction, the width of depletion layer.

decreases

increases

remains the same

may increase or decrease

⇒ Which of the following is error correcting code?

EBCDIC

Gray

Hamming

ASCII

⇒

Match the following:

List I (FET Parameters) | List II (Typical Values) | ||
---|---|---|---|

A. | g for JFET_{m} | 1. | 25 kW |

B. | r for JFET_{d} | 2. | 0.01 siemen |

C. | r for MOSFET_{d} | 3. | 0.5 mW |

D. | g for JFET_{g} | 4. | 10^{-8} siemen |

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

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

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

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

⇒ In a N-P-N transistor, when emitter junction is forward biased and collector junction is reverse biased the transistor will operate in

active region

saturation region

cut-off region

inverted region

⇒ If a RAM has 34 bits in its MAR and 16 bits in its MDR, then its capacity will be

32 GB

16 GB

32 MB

16 MB

⇒ LET JCOKE = 11 and LPEPSI = 19. Consider the statement

16

9

14

⇒ For ideal performance, a filter should be terminated in characteristic impedance.

TRUE

FALSE

⇒ A D' Arsonval galvanometer is a

moving coil instrument

moving iron instrument

dynamometer instrument

induction instrument

⇒ With a JK master-slave flip-flop the master is clocked when the clock is __________ , and the slave is triggered when the clock is __________ .

low, low

high, low

low, high

high, high

⇒ Which of them contains an organic fluid?

LED

LCD

Both LED and LCD

Neither LED nor LCD

⇒ In the schematic representation of bipolar junction transistor, the direction of arrow shows the direction of flow of

holes

electrons

holes in

*pnp*and electrons in

*npn*

electrons in

*pnp*and holes in

*npn*

⇒ If V

_{a0}, V

_{a1}, V

_{a2}are sequence components of V

_{a}and I

_{a0}, I

_{a1}, I

_{a2}are sequence components of I

_{a}, then total 3 phase power P is given by

P = V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2}

P = V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2}

^{*}

P = 3(V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2})

P = 3(V

_{a0}I

_{a0}+ V

_{a1}I

_{a1}+ V

_{a2}I

_{a2}

^{*})

⇒ SWR for a transmission line is infinity when the load is

- Short circuit
- Complex impedance
- Open circuit
- Pure reactance

1, 3, 4 are correct

1 and 3 are correct

2, 3, 4 are correct

1, 2, 4 are correct

⇒ In a two phase servomotor the voltages applied to the two stator windings

are equal in magnitude and are in phase

are unequal in magnitude but are in phase

are equal in magnitude but have a phase difference of 90°

are unequal in magnitude and have a phase difference of 90°

⇒ The instrument used to check insulation of household wiring is

megger

ohmmeter

multimeter

high resistance voltmeter

⇒ In Bode diagrams an octave is a frequency band from

ω

_{1}to 10 ω

_{1}

ω

_{1}to 8 ω

_{1}

ω

_{1}to 4 ω

_{1}

ω

_{1}to 2 ω

_{1}

⇒ Read the following statements about Excel

- It supports many arithmetic functions like SUM, ABS, EXP, INT, MOD etc.
- It supports many trigonometric functions.
- It supports IRR function to calculate interest rate.
- It supports PV function to calculate the present value of future receipts.

All

1, 2 and 3 only

1, and 2 only

1 only

⇒ Generally, the gain of a transistor amplifier falls at high frequency due to the

internal capacitance of the device

coupling capacitor at the I/P

skin effect

coupling capacitor at the O/P

⇒ The conductivity of an intrinsic semiconductor is

generally less than that of a doped semiconductor

given by σ

_{1}=

*en*

_{i}(μ

_{n}- μ

_{p})

given by σ

_{1}=

*en*

_{i}(μ

_{p}+ μ

_{n})

given by σ

_{1}=

*n*

_{i}(μ

_{n}+ μ

_{p})

⇒ An amplifier operating over a frequency range of 18 to 20 MHz has 10 kΩ input resistance. At a temperature of 27° C, the noise voltage at input of amplifier is (Boltzman constant

*k*= 1.38 x 10

^{-23}J/K)

18.2 μV

182 μV

16.2 μV

162 μV

⇒ Sulphur hexafluoride is used in

transformers

generators

relays

circuit breakers

⇒ Which of the following equations satisfy Maxwell's equations?

E

_{x}= E

_{y}= 0, E

_{z}= cos (

*y*-

*ct*)

E

_{x}= E

_{y}= 0, E

_{z}= cos (

*y*-

*ct*)

F

_{y}= cos (

*y*-

*ct*), E

_{x}= E

_{z}= 0

None of these

⇒ In figure

*v*

_{i}= 10 mV dc maximum. The maximum possible dc output offset voltag

60 mV dc

110 mV dc

130 mV dc

150 mV dc

⇒ Which of the following amplifiers is used for impedance matching?

CE

CC

CB

Push pull