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Q1. | As temperature increases |

A. | the forbidden energy gap in silicon and germanium increase [Wrong Answer] |

B. | the forbidden energy gap in silicon and germanium decrease [Correct Answer] |

C. | the forbidden energy gap in silicon decreases while that in germanium decreases [Wrong Answer] |

D. | the forbidden energy gap in silicon increases while that in germanium decreases [Wrong Answer] |

View Answer
Explanation:-
Answer : BDiscuss 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 :**

⇒

*n*-channel MOS is

slower than

*p*-channel MOS

faster than

*p*-channel MOS

same as

*p*-channel MOS

none of these

⇒ In the FM wave described by equation

*v*= 15 sin (4 x 10

^{8}

*t*+ 3 sin 1100

*t*), the maximum frequency deviation is

175 Hz

525 Hz

3 Hz

58.33 Hz

⇒ Which of the following is operating system?

MS WORD

Ventura

Java

Windows

⇒ A series RLC circuit has a resonant frequency of 2000 Hz. The maximum voltage across C is likely to occur at a frequency of about

1000 Hz

4000 Hz

2025 Hz

1975 Hz

⇒ A shadow zone does not receive any space wave

TRUE

FALSE

⇒ A thyristor has maximum allowable junction temperature of 110° C and the ambient temperature is 40°C, If the maximum internal power dissipation is 50 W, the thermal resistance is

2° C/W

1.4° C/W

0.7°C/W

2.2° C/W

⇒ Electrons can be emitted from a metal surface due to high electric field.

TRUE

FALSE

⇒ In a television transmitter, the output stage is most likely to be

screen modulated class C amplifier

plate modulated class C amplifier

grid modulated class A amplifier

grid modulated class C amplifier

⇒ In a BJT CE amplifier circuit the value of coupling capacitor should be such that

its reactance is small for the lowest frequency in the input and output

its reactance is high for the lowest frequency in the input and output

its reactance is zero for the lowest frequency in the input and output

its reactance is infinite for the lowest frequency in the input and output

⇒ Consider the following statements:

- Taking 2's complement is equivalent to sign change.
- In the 2's complement representation the most significant bit (MSB) is zero for a positive number.
- In a 4 bit binary representation of a binary number A, A + 1's complement of A = 2
^{4}.

1 and 2 only

1 and 3 only

2 and 3 only

1, 2 and 3

⇒ The transmitting antennas for lower frequencies (below 500 kHz) are generally

vertical grounded wire type

horizontal suspended wire type

parabolic reflector type

any of the above

⇒ Two capacitors of 1 μF and 2 μF capacitance are connected in parallel across a 30 V dc battery. After the capacitors have been charged, the charges across the two capacitors will be

30 μC each

60 μC each

30 μC and 60 μC respectively

60 μC and 30 μC respectively

⇒ When a single phase dual converter is operating in circulating current mode

both converters are working as rectifiers simultaneously

one converter is always working as rectifier and the other as inverter

only one converter is working at one time

both converters are either working as rectifiers or as inverters simultaneously

⇒ Principle of superposition is applicable to

linear systems only

nonlinear systems only

both linear and non linear system

linear systems and some nonlinear systems

⇒ In the circuit of figure,

*v*

_{03 v1 + 4 v2-3 v1 - 4 v24 v1 + 3 v2-4 v1 - 3 v2}

⇒ Power is drawn from a source at power factor 0.7. P

_{av}= 300 watt. The reactive power is

0

105

100 VA

107 VA

⇒ In the figure shows the circuits symbo

FET

PMOSFET

CMOSFET

NMOSFET

⇒ A separately excited dc motor is run from a dc source through a chopper. At 600 rpm and rated torque, the duty cycle of chopper is 0.8. At 600 rpm and half the rated torque, the duty cycle is likely to be

0.9

0.8

0.75

0.6

⇒

**Assertion (A):** The main use of Miller integrator is to generate ramp

**Reason (R):** An inverting amplifier can handle more than one input at the same time.

Both A and R are correct and R is correct explanation for A

Both A and R are correct but R is not correct explanation for A

A is correct R is wrong

A is wrong R is correct

⇒ What does a link budget for satellite communication include?

Total cost of satellite

Cost of satellite plus launch vehicle

Signal and noise levels is dB

Margins of error permitted

⇒ In Java 31% gives an answer

3

4

42798

42828

⇒ In an induction wattmeter, the shading bands are made of non conducting material.

TRUE

FALSE

⇒ Which of the following statements is/are true for the diamond structure?

- Coordination number is four.
- Packing fraction is 0.34
- Copper crystallizes into diamond structure
- Lattice is FCC.

1 only

1, 2 and 4

2 and 3 only

2, 3 and 4

⇒ A counter displays a sequence of numbers. If a reading corresponds to the hexadecimal number F52E, the next two readings are respectively

F52F, F520

F530, F531

F52F, F530

F52F, F52G

⇒

Match the following:

List I (Properties) | List II (Relations) | ||
---|---|---|---|

A. | Linear but NOT time-invariant | 1. | y(t) = t^{2}x(t) |

B. | Time-invariant but NOT linear | 2. | y(t) = t |x(t)| |

C. | Linear and time invariant | 3. | y(t) = |x(t)| |

4. | y(t) = x(t - 5) |

A-1, B-3, C-4

A-2, B-3, C-4

A-3, B-1, C-2

A-1, B-2, C-3

⇒ In a bipolar junction transistor a

_{dc}= 0.98, I

_{CO}= 2 μA and 1

_{B}= 15 μA. The collector current I

_{C}is

635 mA

735 mA

835 mA

935 mA

⇒ In Z

_{RC}(

*s*) = constant at

*s*= 0, the last element in first Foster cauer realization is

R

C

R and C in series

R and C in parallel

⇒ A memory system of size 16 k bytes is to be designed using memory chips which have 12 address lines and 4 data lines each. The number of such chips required to design the memory system is

2

4

8

18

⇒ The fluctuation in the received signal strength at the receiver of a random variation in the received signal is known as

fluctuation

fading

absorption

cycling

⇒ For an RC impedance function Z

Z(∞) = Z(0)

Z(∞) < Z(0)

Z(∞) ≤ Z(0)

Z(∞) > Z(0)