MEGAMIND

20 Questions | By Manisha Md | Updated: Sep 1, 2017 | Attempts: 114

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1.

In the following figure, voltage divider bias NPN transistor circuit, if R₂ opens, the transistor is in ____________
- A.
  
  Saturated region
- B.
  
  Cutoff region
- C.
  
  Active region
- D.
  
  Non-conducting
Correct Answer
A. Saturated region
2.

For the NMOSFET shown, the threshold voltage is V_{th ,}where V_th>0.The source voltage V_ss is varied from 0 to V_DD.Neglecting the channel length modulation , the drawn current I_{D ,}as a function of V_ssis represented by _________
- A.
  
  Option 1
- B.
  
  Option 2
- C.
  
  Option 3
- D.
  
  Option 4
Correct Answer
A. Option 1
3.

In the circuit shown BJT has current gain (ß)of 50 .For V_EB=600mV, V_ECis ____________
- A.
  
  0.5V
- B.
  
  1V
- C.
  
  1.5V
- D.
  
  2V
Correct Answer
D. 2V
4.

In the circuit shown, the silicon NPN transistor Q has a very high value of ß.The required value of R₂in kΩ to produce I_c=1mA is______________
- A.
  
  20
- B.
  
  30
- C.
  
  40
- D.
  
  50
Correct Answer
C. 40
5.

If the transistors in the figure have high values of ß and a V _BEof 0.65V , the current I flowing through the 2kΩ resistor will be____________
- A.
  
  1mA
- B.
  
  2mA
- C.
  
  3mA
- D.
  
  4mA
Correct Answer
A. 1mA
6.

Which one of the following is a basic comparator?
- A.
  
  XOR
- B.
  
  XNOR
- C.
  
  AND
- D.
  
  NAND
Correct Answer
B. XNOR
7.

The minimum number of two input NAND gates required to implement the boolean function , Z=AB'C is__________
- A.
  
  7
- B.
  
  2
- C.
  
  11
- D.
  
  5
Correct Answer
D. 5
8.

The LED will glow when__________
- A.
  
  S₁ and S₂ are open
- B.
  
  S₁and S₂ are closed
- C.
  
  S₁or S₂ are closed
- D.
  
  The LED does not emit light irrespective of the position of the swtiches
Correct Answer
D. The LED does not emit light irrespective of the position of the swtiches
9.

The boolean expression (X+Y)(X+Y')+((XY')+X')' simplifies to _____________
- A.
  
  X
- B.
  
  Y
- C.
  
  X+Y
- D.
  
  XY
Correct Answer
A. X
10.

Junction 'S' acts as______________
- A.
  
  AND gate
- B.
  
  OR gate
- C.
  
  NOT gate
- D.
  
  None of the above
Correct Answer
A. AND gate
11.

If the vectors A and B are conservative ,
- A.
  
  AxB is solenoidal
- B.
  
  AxB is irrotational
- C.
  
  A+B is solenoidal
- D.
  
  A-B is solenoidal
Correct Answer
A. AxB is solenoidal
12.

If A= xyU_{x +} yzU_y + xzU_zthen the value of A when integrated over the closed surface S , given by: 0≤x≤1, 0≤y≤1, 0≤z≤1
- A.
  
  0.5
- B.
  
  5
- C.
  
  1.5
- D.
  
  0
Correct Answer
C. 1.5
13.

The expression for B given that in free space E=15cos(6πx10⁸t-2πz) i_x in V/m is________________
- A.
  
  5x10^-8cos(6πx10⁸t-2πz) iy
- B.
  
  -90πx10⁸sin(6πx10⁸t-2πz) i_x
- C.
  
  -45πx10⁸sin(6πx10⁸t-2πz) i_y
- D.
  
  5x10^-8(cos(6πx10⁸t-2πz)-sin(6πx10⁸t-2πz)) i_z
Correct Answer
A. 5x10^-8cos(6πx10⁸t-2πz) iy
14.

The value of ∫dl over the closed circle of radius 'r' is_________
- A.
  
  0
- B.
  
  4π
- C.
  
  2π
- D.
  
  πr²
Correct Answer
A. 0
15.

An electric field on a plane is described by its potential V=20(r^-1+r^-2) where r is the distance from the source. The field is due to___________
- A.
  
  A monopole
- B.
  
  A dipole
- C.
  
  Both a monopole and a dipole
- D.
  
  A quadrupole
Correct Answer
C. Both a monopole and a dipole
16.

Two magnetically uncoupled inductive coils have Q- factors Q₁and Q₂ at the chosen operating frequency. Their respective Resistances are r₁and r₂.When connectd in series their respective Q-factor at the same operating frequency is_______________
- A.
  
  Q₁+Q₂
- B.
  
  (1/Q₁)+(1/Q₂)
- C.
  
  (Q₁R₁+Q₂R₂)/(R₁+R₂)
- D.
  
  (Q₁R₂+Q₂R₁)/(R₁+R₂)
Correct Answer
C. (Q₁R₁+Q₂R₂)/(R₁+R₂)
17.

A fully charge mobile phone with 12V battery is good for a 10min talktime. Assume that during the talktime, the battery offers a constant current of 2A and the voltage drops from 12V to 10V as shown.How much energy does the battery deliver during the talktime?
- A.
  
  220J
- B.
  
  12kJ
- C.
  
  13.2kJ
- D.
  
  14.4kJ
Correct Answer
C. 13.2kJ
18.

Determine V_L
- A.
  
  -6.25V
- B.
  
  6.25V
- C.
  
  9.8V
- D.
  
  10.12v
Correct Answer
A. -6.25V
19.

Determine V₁,V₂,V₃
- A.
  
  1.5V, 2V, 1.67V
- B.
  
  24V, 8V, 15V
- C.
  
  2V, 2V, 2V
- D.
  
  10V, 6V, 8V
Correct Answer
B. 24V, 8V, 15V
20.

Consider a delta connection of resistors and its equivalent star connection as shown.If all the delta connections are scaled by a factor of k, k>0, the corresponding elements of star equivalent will be scaled by a factor of________
- A.
  
  K²
- B.
  
  1/k
- C.
  
  K
- D.
  
  √k
Correct Answer
B. 1/k

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Current Version
Sep 01, 2017

Quiz Edited by
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Sep 01, 2017

Quiz Created by
Manisha Md

Megamind

In the following figure, voltage divider bias NPN transistor circuit, if R2 opens, the transistor is in ____________

For the NMOSFET shown, the threshold voltage is Vth , where Vth >0.The source voltage Vss is varied from 0 to VDD. Neglecting the channel length modulation , the drawn current ID , as a function of Vss is represented by _________

In the circuit shown BJT has current gain (ß)of 50 .For VEB =600mV, VEC is ____________

In the circuit shown, the silicon NPN transistor Q has a very high value of ß.The required value of R2 in kΩ to produce Ic=1mA is______________

If the transistors in the figure have high values of ß and a V BE of 0.65V , the current I flowing through the 2kΩ resistor will be____________

Which one of the following is a basic comparator?

The minimum number of two input NAND gates required to implement the boolean function , Z=AB'C is__________

The LED will glow when__________

The boolean expression (X+Y)(X+Y')+((XY')+X')' simplifies to _____________

Junction 'S' acts as______________

If the vectors A and B are conservative ,

If A= xyUx + yzUy + xzUz then the value of A when integrated over the closed surface S , given by: 0≤x≤1, 0≤y≤1, 0≤z≤1

The expression for B given that in free space E=15cos(6πx108t-2πz) ix in V/m is________________

The value of ∫dl over the closed circle of radius 'r' is_________

An electric field on a plane is described by its potential V=20(r-1+r-2) where r is the distance from the source. The field is due to___________

Two magnetically uncoupled inductive coils have Q- factors Q1 and Q2 at the chosen operating frequency. Their respective Resistances are r1 and r2.When connectd in series their respective Q-factor at the same operating frequency is_______________

A fully charge mobile phone with 12V battery is good for a 10min talktime. Assume that during the talktime, the battery offers a constant current of 2A and the voltage drops from 12V to 10V as shown.How much energy does the battery deliver during the talktime?

Determine VL

Determine V1,V2,V3

Consider a delta connection of resistors and its equivalent star connection as shown.If all the delta connections are scaled by a factor of k, k>0, the corresponding elements of star equivalent will be scaled by a factor of________

In the following figure, voltage divider bias NPN transistor circuit, if R₂ opens, the transistor is in ____________

For the NMOSFET shown, the threshold voltage is V_{th ,}where V_th>0.The source voltage V_ss is varied from 0 to V_DD.Neglecting the channel length modulation , the drawn current I_{D ,}as a function of V_ssis represented by _________

In the circuit shown BJT has current gain (ß)of 50 .For V_EB=600mV, V_ECis ____________

In the circuit shown, the silicon NPN transistor Q has a very high value of ß.The required value of R₂in kΩ to produce I_c=1mA is______________

If the transistors in the figure have high values of ß and a V _BEof 0.65V , the current I flowing through the 2kΩ resistor will be____________

If A= xyU_{x +} yzU_y + xzU_zthen the value of A when integrated over the closed surface S , given by: 0≤x≤1, 0≤y≤1, 0≤z≤1

The expression for B given that in free space E=15cos(6πx10⁸t-2πz) i_x in V/m is________________

An electric field on a plane is described by its potential V=20(r^-1+r^-2) where r is the distance from the source. The field is due to___________

Two magnetically uncoupled inductive coils have Q- factors Q₁and Q₂ at the chosen operating frequency. Their respective Resistances are r₁and r₂.When connectd in series their respective Q-factor at the same operating frequency is_______________

Determine V_L

Determine V₁,V₂,V₃