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Q1. | What happens when forward bias is applied to a junction diode? |

A. | Majority carrier current is reduced to zero [Wrong Answer] |

B. | Minority carrier current is reduced to zero [Wrong Answer] |

C. | Potential barrier is increased [Wrong Answer] |

D. | Potential barrier is decreased [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 :**

⇒ In Bode plots, frequency is plotted on log scale.

TRUE

FALSE

⇒ In an ac network the sum of currents entering a node is 10 ∠45°. The sum of currents leaving the node is

19.32 ∠45°

15 ∠45°

20 ∠45°

zero

⇒ Speeds of sound and radio waves are equal.

TRUE

FALSE

⇒

Match the following:

List I (Theorems) | List II (Property of Network) | ||
---|---|---|---|

A. | Reciprocity | 1. | Impedance matching |

B. | Tellegen's | 2. | Bilateral |

C. | Superposition | 3. | ∑ V_{jk} I_{jk} = 0 |

D. | Maximum power transfer | 4. | Linear |

5. | Non linear |

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

A-1, B-2, C-3, D-5

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

A-2, B-3, C-5, D-1

⇒ Phase modulation is commonly-used for data transmission mainly because

phase can be varied from + 180° to 180°

it is resistant to the effects of noise

demodulation is very easy

it gives highest data rates that can be transmitted over a given channel

⇒ In the circuit of figure β = 100 and quiescent value of base current is 20 μA. The quiescent value of colle

0.2 μA

2 μA

2 mA

20 mA

⇒ Consider the following statements as regards noise

- If Gaussian noise is applied at input of a rectifier, the output is not gaussian
- The noise encountered on a telephone line consists of short, pulse type disturbances whose amplitude distribution is not Gaussian
- Shot noise results from random emission of electrons from a cathode
- Shot noise results from phenomenon associated with the flow of current across semi conductor junctions

1, 2, 3, only

1, 2, 4 only

1, 2, 3, 4

2, 3 only

⇒ A . 0 =

1

A

0

A or 1

⇒ Which of the following pulse communication system is inherently immune to noise?

PPM

PCM

PWM

PAM

⇒ A 3 phase induction motor is controlled by voltage and frequency control such that the ratio V/

*f*is constant. At 50 Hz, the starting torque is 100 N-m. At 25 Hz, the starting torque

will be less than 100 N-m

will be more than 100 N-m

may be more or less than 100 N-m depending on motor parameters

very small

⇒ A 2 bit binary multiplier can be implemented using

2 I/P only

2 I/P XOR

*and 4 I/P and gates only*

_{s}two 2 I/P

_{s}NOR and one XNOR gate

XOR gates and shift Register

⇒ Which of the following real expressions is incorrect in Pascal?

`Y - X `

`(A + B) (C + D)`

`X / Y - Z `

`P * Z - 5.0`

⇒ Which of the following insulating material is restricted to temperatures below 100°C?

Micanite

Asbestos

Teflon

Polythene

⇒

Match the following:

List I (Symbol in Java comparison operator) | List II (Meaning) | ||
---|---|---|---|

A. | = = | 1. | Greater than or equal to |

B. | ! = | 2. | Equal |

C. | > = | 3. | Not equal |

A-1, B-2, C-3

A-3, B-2, C-1

A-1, B-3, C-2

A-2, B-3, C-1

⇒ The effect of the inductance of a coil on a constant direct current is that

it does not effect the constant direct current

it decreases the current

it strengthens the current

it causes a higher voltage drop

⇒

*V*

_{L}= 100 cos (10

*t*+ 30&d

116.57 sin (10

*t*- 29°) V

116.57 sin (10

*t*+ 29°) V

117.00 sin (10

*t*- 29°) V

117.00 sin (10

*t*+ 29°) V

⇒ One limitation of constant

*k*filters is that Z

_{0}is not constant in the pass band.

TRUE

FALSE

⇒ Low frequency boost can be easily compensated by

attenuating the frequencies from 0 to 1.25 MHz

using an appropriate de-emphasis circuit in the receiver

using an appropriate pre-emphasis circuit in the transmitter

none

⇒ Primary advantage of a crystal oscillator is that

it can oscillate at any frequency

it gives a high O/P voltage

its frequency of oscillation remains almost constant

it operates on a very low dc supply voltage

⇒ In figure the output

*v*(

*t*)

phase modulated signal

amplitude modulated signal

frequency modulated signal

none of the above

⇒ Binary number 101101 when converted to its 2's complement will become

101.01

100.1

100.1

101.1

⇒ Neutralization is used in RF amplifiers to

stop oscillation

increase bandwidth

improve selectivity

all of the above

⇒ Magnesium is alloyed with conducting materials for antenna primarily with the purpose of

increasing efficiency

improving radiative power

reducing weight

increasing density

⇒ The complement of exclusive OR function is

AB + A B

AB + A B

A B + A

AB + A B

⇒

**Assertion (A):** Megger is used to check insulation resistance of cables.

**Reason (R):** Insulation resistance of cables is very high.

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 R is false

A is false R is true

⇒ In a metal the probability of a state 0.1 eV below Fermi level being occupied

is more than the probability of state 0.1 eV above Fermi level being occupied

is the same as the probability of state 0.1 eV above Fermi level being occupied

is less than the probability of state 0.1 eV above Fermi level being occupied

may be equal to or more or less than the probability of state 0.1 eV above Fermi level being occupied

⇒ The

*Z*inverse of the given

*Z*transform i

unit step

unit impulse

unit ramp

unit parabola

⇒ The output, V-I characteristics of an Enhancement type MOSFET has

only an ohmic region

only a saturation region

an ohmic region at low voltage value followed by a saturation region at higher voltages

an ohmic region at large voltage values preceded by a saturation region at lower voltages

⇒ In a minimum function

the degree of numerator is higher than that of denominator

the degree of numerator is lower than that of denominator

the degree of numerator and denominator are equal

the denominator is a constant

⇒ A helical antenna is used for satellite tracking due to its

good front to back ratio

broad bandwidth

circular polarization

both (a) and (b)