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Assertion (A): The duty cycle of a class C amplifier affects the power dissipation of transistor Reason (R): At higher harmonics the efficiency of a class C amplifier becomes poor | |
A. | Both A and R are correct and R is correct explanation for A [Wrong Answer] |
B. | Both A and R are correct but R is not correct explanation for A [Correct Answer] |
C. | A is correct R is wrong [Wrong Answer] |
D. | A is wrong R is correct [Wrong Answer] |
View Answer
Explanation:-
Answer : B Discuss it below : !! OOPS Login [Click here] is required to post your answer/result |
Also Read Similar Questions Below :
⇒ The function Z(s) has a pole at infinity if
the degree of numerator and denominator of Z(s) are equal
the numerator of Z(s) is one degree higher than denominator
the denominator of Z(s) is one degree higher than numerator
the degree of numerator and denominator are either equal or differ by one
⇒ The resistance values of a PIN diode under positive bias and negative bias respectively are about
a few ohms and a kilo ohms
about 100 ohms and 1000 ohms
about 0.1 ohm and 100 ohms
about 1000 ohms and 10000 ohms
⇒ A constant k low pass filter has f_{c} = 500 Hz. At f = 1000 Hz, the attenuation is
zero
infinity
may be zero or infinity
more than zero but less than infinity
⇒ A class A chopper has an input voltage of 200 V. T_{on} = 1.5 ms and T_{off} = 4.5 ms. The duty cycle, average output voltage and ripple factor respectively are
0.5, 100 V and 1
0.25, 50 V and 3
0.25, 50 V and 1
0.5, 100 V and 3
⇒ A transmission line has Z_{0} = 300 Ω and Z_{L} = (300 - j300) ohm. The transmission coefficient is
1.265 ∠ - 18.43°
1.01 ∠ - 10°
1.14 ∠ 66.68°
1.09 ∠ 66.68°
⇒ When atoms are held together by the sharing of valence electrons
each atom becomes free to move
neutrons start shifting
they form a covalent bond
some of the electrons are lost
⇒ In case of surface waves the field strength at a point is directly proportional to
antenna height
wave frequency
current of the antenna
distance of the point from the antenna
⇒ In the vacuum diode equation i_{b} = ke_{b}^{1.5}, the current is
temperature limited current
space charge limited current
any of the above
none of the above
⇒ Hue of a colour means
amount of light energy received by eye
predominant spectral purity of colour light
amount of other colours present
none of the above
⇒ If poles lie in first quadrant, damping ratio is
1
more than 1
less than 1
zero
⇒ A vertical wire of 1 meter length carries a current of 1 A at 10 MHz. The total radiated power is nearly
0.13 W
0.88W
7.3 W
73 W
⇒ A loop antenna may be of
square on triangular shape
hexagonal shape
circular shape
any of the above
⇒
A-1, B-2, C-3, D-4
A-4, B-3, C-2, D-1
A-3, B-4, C-1, D-2
A-4, B-3, C-1, D-2
⇒ A differentiating amplifier has capacitor in the input path.
TRUE
FALSE
⇒ The potential that appears at a point in space due to the current which caused it is called potential
accelerating
retardation
oscillating
lagging the current
⇒ In a TV receiver antenna the length of reflector rod
is the same as that of dipole
is less than that of dipole
is more than that of dipole
may be equal, more or less than that of dipole
⇒ In a ripple counter,
whenever a flip flop sets to 1, the next higher FF toggles
whenever a flip flop sets to 0, the next higher FF remains unchanged
whenever a flip flop sets to 1, the next higher FF faces race condition
whenever a flip flop sets to 0, the next higher FF faces race condition
⇒
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
R is correct but A is wrong
⇒ Consider the following; for a loss-less transmission line we can write,
1, 2
2, 3
1, 3
2, 4
⇒ The energy stored in a coil is 108 J. It is opened suddenly in 10 ms. The power dissipated instantaneously across the blades of switch is
108 W
1080 W
10800 W
108000 W
⇒ A series RLC circuit is at resonance at 200 Hz. If capacitance is increased to four times, the circuit will be in resonance at
200 Hz
400 Hz
100 Hz
800 Hz
⇒ Thevenin's equivalent circuit
can be drawn only in time domain
can be drawn only in frequency domain
can be drawn both in time and frequency domain
can be drawn in frequency domain with some restrictions
⇒ At present, the radio-frequency band mainly used by most satellites is
EHF
UHF
VHF
SHF
⇒ If we manage to __________ our natural resources, we would leave a better planet for our children.
uphold
restrain
Cherish
conserve
⇒
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
⇒ If a function has only cosine terms, it must satisfy the equation
f(t) = -f(t)
f(-t) = f(t)
f(-t) = -f(t)
none of the above
⇒ Which one of the systems described by the following I/P - O/P relations is time invariant
y(n) = n x(n)
y(n) = x(n) - x(n - 1)
y(n) = x(- n)
y(n) = x(n) cos 2pf_{0}n
⇒
Both A and R are correct and R is correct explanation of A
Both A and R correct but R is not correct explanation of A
A is correct but R is wrong
A is wrong but R is correct
⇒ Pirani gauge is used to measure
very low pressure
high pressure
pressure in the range of 1 atmosphere
fluid flow
⇒ For the floating point numbers 1.81 x 10^{-29} and 0.0152 x 10^{18} the normalised forms are
0.181 x 10^{-28} and 0.152 x 10^{17 }respectively
18.1 x 10^{-30} and 0.152 x 10^{17} respectively
0.181 x 10^{-28} and 1.52 x 10^{16} respectively
None of the above
⇒ The function Z(s) has a pole at infinity if
the degree of numerator and denominator of Z(s) are equal
the numerator of Z(s) is one degree higher than denominator
the denominator of Z(s) is one degree higher than numerator
the degree of numerator and denominator are either equal or differ by one
⇒ The resistance values of a PIN diode under positive bias and negative bias respectively are about
a few ohms and a kilo ohms
about 100 ohms and 1000 ohms
about 0.1 ohm and 100 ohms
about 1000 ohms and 10000 ohms
⇒ A constant k low pass filter has f_{c} = 500 Hz. At f = 1000 Hz, the attenuation is
zero
infinity
may be zero or infinity
more than zero but less than infinity
⇒ A class A chopper has an input voltage of 200 V. T_{on} = 1.5 ms and T_{off} = 4.5 ms. The duty cycle, average output voltage and ripple factor respectively are
0.5, 100 V and 1
0.25, 50 V and 3
0.25, 50 V and 1
0.5, 100 V and 3
⇒ A transmission line has Z_{0} = 300 Ω and Z_{L} = (300 - j300) ohm. The transmission coefficient is
1.265 ∠ - 18.43°
1.01 ∠ - 10°
1.14 ∠ 66.68°
1.09 ∠ 66.68°
⇒ When atoms are held together by the sharing of valence electrons
each atom becomes free to move
neutrons start shifting
they form a covalent bond
some of the electrons are lost
⇒ In case of surface waves the field strength at a point is directly proportional to
antenna height
wave frequency
current of the antenna
distance of the point from the antenna
⇒ In the vacuum diode equation i_{b} = ke_{b}^{1.5}, the current is
temperature limited current
space charge limited current
any of the above
none of the above
⇒ Hue of a colour means
amount of light energy received by eye
predominant spectral purity of colour light
amount of other colours present
none of the above
⇒ If poles lie in first quadrant, damping ratio is
1
more than 1
less than 1
zero
⇒ A vertical wire of 1 meter length carries a current of 1 A at 10 MHz. The total radiated power is nearly
0.13 W
0.88W
7.3 W
73 W
⇒ A loop antenna may be of
square on triangular shape
hexagonal shape
circular shape
any of the above
⇒
Match the following:
List I | List II | ||
---|---|---|---|
A. | h_{ie} | 1. | 49 |
B. | h_{re} | 2. | 25 x 10^{-6}siemens |
C. | h_{fe} | 3. | 2.4 x 10^{-4} |
D. | h_{oe} | 4. | 1000 ohms |
A-1, B-2, C-3, D-4
A-4, B-3, C-2, D-1
A-3, B-4, C-1, D-2
A-4, B-3, C-1, D-2
⇒ A differentiating amplifier has capacitor in the input path.
TRUE
FALSE
⇒ The potential that appears at a point in space due to the current which caused it is called potential
accelerating
retardation
oscillating
lagging the current
⇒ In a TV receiver antenna the length of reflector rod
is the same as that of dipole
is less than that of dipole
is more than that of dipole
may be equal, more or less than that of dipole
⇒ In a ripple counter,
whenever a flip flop sets to 1, the next higher FF toggles
whenever a flip flop sets to 0, the next higher FF remains unchanged
whenever a flip flop sets to 1, the next higher FF faces race condition
whenever a flip flop sets to 0, the next higher FF faces race condition
⇒
Assertion (A): Integral control action is sometimes called reset control.
Reason (R): Reset rate is expressed as number of repeats per unit time.
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
R is correct but A is wrong
⇒ Consider the following; for a loss-less transmission line we can write,
- Z_{in} = - jz_{0} for a shorted line with l = λ/8
- Z_{in} = ± j ∞ for a shorted line with l = λ/4
- Z_{in}= jz_{0} for an open line with l = λ/2
- Z_{in} = 0 for a matched line of any length
1, 2
2, 3
1, 3
2, 4
⇒ The energy stored in a coil is 108 J. It is opened suddenly in 10 ms. The power dissipated instantaneously across the blades of switch is
108 W
1080 W
10800 W
108000 W
⇒ A series RLC circuit is at resonance at 200 Hz. If capacitance is increased to four times, the circuit will be in resonance at
200 Hz
400 Hz
100 Hz
800 Hz
⇒ Thevenin's equivalent circuit
can be drawn only in time domain
can be drawn only in frequency domain
can be drawn both in time and frequency domain
can be drawn in frequency domain with some restrictions
⇒ At present, the radio-frequency band mainly used by most satellites is
EHF
UHF
VHF
SHF
⇒ If we manage to __________ our natural resources, we would leave a better planet for our children.
uphold
restrain
Cherish
conserve
⇒
Assertion (A): In monolithic IC the components are part of one chip
Reason (R): An op-amp is a high gain dc amplifier
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
⇒ If a function has only cosine terms, it must satisfy the equation
f(t) = -f(t)
f(-t) = f(t)
f(-t) = -f(t)
none of the above
⇒ Which one of the systems described by the following I/P - O/P relations is time invariant
y(n) = n x(n)
y(n) = x(n) - x(n - 1)
y(n) = x(- n)
y(n) = x(n) cos 2pf_{0}n
⇒
Assertion (A): The output voltage of an inverter can be controlled by PWM technique
Reason (R): In a current source inverter the input current is constant.
Both A and R are correct and R is correct explanation of A
Both A and R correct but R is not correct explanation of A
A is correct but R is wrong
A is wrong but R is correct
⇒ Pirani gauge is used to measure
very low pressure
high pressure
pressure in the range of 1 atmosphere
fluid flow
⇒ For the floating point numbers 1.81 x 10^{-29} and 0.0152 x 10^{18} the normalised forms are
0.181 x 10^{-28} and 0.152 x 10^{17 }respectively
18.1 x 10^{-30} and 0.152 x 10^{17} respectively
0.181 x 10^{-28} and 1.52 x 10^{16} respectively
None of the above