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A transistor may fail due to | |
A. | open weld at the wire leads to the semi-conductor [Wrong Answer] |
B. | short circuit caused by momentary overloads [Wrong Answer] |
C. | overheating due to circuit failures [Wrong Answer] |
D. | any of the above [Correct Answer] |
View Answer
Explanation:-
Answer : D Discuss it below : !! OOPS Login [Click here] is required to post your answer/result |
Also Read Similar Questions Below :
⇒ N circles for a = a_{1}, and a = a_{1} ± 180° n (where n = 1, 2, 3, ....) are the same.
TRUE
FALSE
⇒ The threshold voltage of an n-channel enhancement mode MOSFET is 0.5 when the device is biased at a gate voltage of 3V. Pinch off would occur at a drain voltage of
1.5 V
2.5 V
3.5 V
4.5 V
⇒
A-1, B-2, C-3
A-2, B-4, C-5
A-1, B-3, C-4
A-2, B-3, C-5
⇒ The current due to thermionic emission is given by Richardson Dushman equation.
TRUE
FALSE
⇒
A-4, B-3, C-2, D-1
A-2, B-3, C-4, D-1
A-4, B-2, C-3, D-1
A-1, B-2, C-3, D-4
⇒ The transistor of following figure in Si diode with a base current of 40 μA and I_{CBO} = 0, if V_{BB} = 6V, R_{E} = 2 kΩ and β = 90, I_{BQ} = 20 μA then I_{EQ1800 μA180 μA2000 μA3000 μA}
⇒ An intrinsic semiconductor (intrinsic electron density = 10^{16} m^{-3}) is deped with donors to a level of 10^{22} m^{-3}. What is the hole density assuming all donors to be ionized?
10^{7} m^{-3}
10^{8} m^{-3}
10^{10} m^{-3}
10^{6} m^{-3}
⇒ For a single phase half wave converter feeding a resistive load, the firing angle a. The waveshape in below figure is
output voltage
input voltage
voltage drop across thyristor
none of the above
⇒ For demodulating PCM; it is first converted into
PDM
PPM
PWM
PAM
⇒ Two thyristors of the same rating and specifications
will have equal on state voltage drops
will have equal forward blocking voltage for the same current
will have different on state voltage drops
may have equal or different on state voltage drops and equal or different forward blocking voltage's for the same current
⇒ A uniform plane wave in the free space is normally incident on an infinitely thick dielectric slab (dielectric constant ε_{r} = 9). The magnitude of the reflection coefficient is
0
0.3
0.5
0.8
⇒ In a biased limiter the clipping level can be adjusted by adjusting the voltage of battery.
TRUE
FALSE
⇒ If two networks are cascaded then
[y] = [y_{a}] . [y_{b}]
[Z] = [Z_{a}] . [Z_{b}]
[a_{a}] = [b_{b}]
[a_{a}] + [b_{b}]
⇒ The minimum gate current which can turn on SCR is called :
trigger current
holding current
junction current
breakover current
⇒ The circuit of the given figure perf
OR function
AND function
exclusive OR function
exclusive NOR function
⇒ Which one of the following is applicable to any network-linear or non-linear, active or passive, time-varying or invariant - as long as Kirchhoff laws are not violated?
Tellegen's theorem
Reciprocity theorem
Maximum power transfer theorem
Superposition theorem
⇒ The frame of an electric motor is earthed through three earthing plates resistances 30 Ω, 20 Ω and 10 Ω respectively. During fault the energy dissipated by three plates are W_{1}, W_{2} and W_{3}. Then
W_{1} > W_{2} > W_{3}
W_{1} < W_{2} < W_{3}
W_{1} = W_{2} = W_{3}
W_{1} + W_{3} < W_{2}
⇒ Which of the following configuration has low thermal stability?
CB
CC
CE
All have identical thermal stability
⇒ A buffer amplifier should have
high output impedance and high input impedance
high output impedance and low input impedance
low output impedance an low input impedance
low output impedance and high input impedance
⇒
Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is correct but R is wrong
A is wrong but R is correct
⇒ To select one out of N equally probable events, the number of bits required is
log_{2} N
log_{10} N
log_{e} N
N
⇒ Saturation of iron core causes distortion.
TRUE
FALSE
⇒ (SI - A)^{-1} = adj(sI - A)/det (sI - A)
TRUE
FALSE
⇒ For a second order instrument, the optimum range of ξ (damping ratio), which gives good frequency response over a wide range of frequencies is
0.5 to 0.6
0.6 to 0.7
0.7 to 0.8
0.8 to 1.0
⇒ Which of the following is a valid variable in FORTRAN 77?
0.125
ALPHA -3
ALPHA 3
BALPHAC
⇒ To turn off an SCR, it is necessary to reduce its current to less than :
trigger current
holding current
breakover current
none of the above
⇒ If operator 'a' = 1 ∠120° then (1 + a + a^{2}) =
-a
-a^{2}
1
0
⇒ The usable bandwidth of ridge wave guide
is lower than that of rectangular waveguide
is higher than that of rectangular waveguide
is almost same as that of rectangular waveguide
is very small as compared to that of rectangular waveguide
⇒ If V_{r} is the reverse voltage across a graded P-N Junction, then the junction capacitance c_{j} is proportional to
(V_{r})^{2}
(V_{r})^{n}
(V_{r})^{-n}
(V_{r})^{3/2}
⇒ Consider the equation s^{2} + 2s + 2 + K(s + 2) = 0. Where do the roots of this equation break on the root loci plot?
-3.414
-2.414
-1.414
-0.414
⇒ N circles for a = a_{1}, and a = a_{1} ± 180° n (where n = 1, 2, 3, ....) are the same.
TRUE
FALSE
⇒ The threshold voltage of an n-channel enhancement mode MOSFET is 0.5 when the device is biased at a gate voltage of 3V. Pinch off would occur at a drain voltage of
1.5 V
2.5 V
3.5 V
4.5 V
⇒
Match the following:
List I | List II | ||
---|---|---|---|
A. | Fourier transform of a Gaussian function | 1. | Gaussian function |
B. | Convolution of a rectangular pulse with itself | 2. | Rectangular pulse |
C. | Current through inductor for step input voltage | 3. | Triangular pulse |
4. | Ramp function | ||
5. | Zero |
A-1, B-2, C-3
A-2, B-4, C-5
A-1, B-3, C-4
A-2, B-3, C-5
⇒ The current due to thermionic emission is given by Richardson Dushman equation.
TRUE
FALSE
⇒
Match the following:
List I (DOS commands) | List II (Meaning) | ||
---|---|---|---|
A. | DBLSPACE | 1. | Deletes a director and its sub-directories |
B. | MEM | 2. | Displays the amount of used and free memory |
C. | SYS | 3. | Put a copy of DOS on disk |
D. | DELTREE | 4. | Compresses files to increase the storage capacity of disc |
A-4, B-3, C-2, D-1
A-2, B-3, C-4, D-1
A-4, B-2, C-3, D-1
A-1, B-2, C-3, D-4
⇒ The transistor of following figure in Si diode with a base current of 40 μA and I_{CBO} = 0, if V_{BB} = 6V, R_{E} = 2 kΩ and β = 90, I_{BQ} = 20 μA then I_{EQ1800 μA180 μA2000 μA3000 μA}
⇒ An intrinsic semiconductor (intrinsic electron density = 10^{16} m^{-3}) is deped with donors to a level of 10^{22} m^{-3}. What is the hole density assuming all donors to be ionized?
10^{7} m^{-3}
10^{8} m^{-3}
10^{10} m^{-3}
10^{6} m^{-3}
⇒ For a single phase half wave converter feeding a resistive load, the firing angle a. The waveshape in below figure is
output voltage
input voltage
voltage drop across thyristor
none of the above
⇒ For demodulating PCM; it is first converted into
PDM
PPM
PWM
PAM
⇒ Two thyristors of the same rating and specifications
will have equal on state voltage drops
will have equal forward blocking voltage for the same current
will have different on state voltage drops
may have equal or different on state voltage drops and equal or different forward blocking voltage's for the same current
⇒ A uniform plane wave in the free space is normally incident on an infinitely thick dielectric slab (dielectric constant ε_{r} = 9). The magnitude of the reflection coefficient is
0
0.3
0.5
0.8
⇒ In a biased limiter the clipping level can be adjusted by adjusting the voltage of battery.
TRUE
FALSE
⇒ If two networks are cascaded then
[y] = [y_{a}] . [y_{b}]
[Z] = [Z_{a}] . [Z_{b}]
[a_{a}] = [b_{b}]
[a_{a}] + [b_{b}]
⇒ The minimum gate current which can turn on SCR is called :
trigger current
holding current
junction current
breakover current
⇒ The circuit of the given figure perf
OR function
AND function
exclusive OR function
exclusive NOR function
⇒ Which one of the following is applicable to any network-linear or non-linear, active or passive, time-varying or invariant - as long as Kirchhoff laws are not violated?
Tellegen's theorem
Reciprocity theorem
Maximum power transfer theorem
Superposition theorem
⇒ The frame of an electric motor is earthed through three earthing plates resistances 30 Ω, 20 Ω and 10 Ω respectively. During fault the energy dissipated by three plates are W_{1}, W_{2} and W_{3}. Then
W_{1} > W_{2} > W_{3}
W_{1} < W_{2} < W_{3}
W_{1} = W_{2} = W_{3}
W_{1} + W_{3} < W_{2}
⇒ Which of the following configuration has low thermal stability?
CB
CC
CE
All have identical thermal stability
⇒ A buffer amplifier should have
high output impedance and high input impedance
high output impedance and low input impedance
low output impedance an low input impedance
low output impedance and high input impedance
⇒
Assertion (A): If frequency is high, the distance between transmitter and antenna may be an appreciable fraction of wavelength
Reason (R): Wavelength is inversely proportional to frequency.
Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is correct but R is wrong
A is wrong but R is correct
⇒ To select one out of N equally probable events, the number of bits required is
log_{2} N
log_{10} N
log_{e} N
N
⇒ Saturation of iron core causes distortion.
TRUE
FALSE
⇒ (SI - A)^{-1} = adj(sI - A)/det (sI - A)
TRUE
FALSE
⇒ For a second order instrument, the optimum range of ξ (damping ratio), which gives good frequency response over a wide range of frequencies is
0.5 to 0.6
0.6 to 0.7
0.7 to 0.8
0.8 to 1.0
⇒ Which of the following is a valid variable in FORTRAN 77?
0.125
ALPHA -3
ALPHA 3
BALPHAC
⇒ To turn off an SCR, it is necessary to reduce its current to less than :
trigger current
holding current
breakover current
none of the above
⇒ If operator 'a' = 1 ∠120° then (1 + a + a^{2}) =
-a
-a^{2}
1
0
⇒ The usable bandwidth of ridge wave guide
is lower than that of rectangular waveguide
is higher than that of rectangular waveguide
is almost same as that of rectangular waveguide
is very small as compared to that of rectangular waveguide
⇒ If V_{r} is the reverse voltage across a graded P-N Junction, then the junction capacitance c_{j} is proportional to
(V_{r})^{2}
(V_{r})^{n}
(V_{r})^{-n}
(V_{r})^{3/2}
⇒ Consider the equation s^{2} + 2s + 2 + K(s + 2) = 0. Where do the roots of this equation break on the root loci plot?
-3.414
-2.414
-1.414
-0.414