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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 :
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(speed of light) (helix circumference helix pitch)
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bus bar
incoming alternator
lamp
fixed coils
⇒ The speed at which axial electric field due to signal advances in a TWT is equal to
speed of light
(speed of light) (helix pitch helix circumference)
(speed of light) (helix circumference helix pitch)
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⇒ The seven bit Hamming code received is 0010001. If even parity has been used, the correct code is
10001
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110001
11001
⇒ In 8086 the flag which enables or disables external interrupts is
IF
DF
TF
CF
⇒ Vividh Bharati programme is transmitted in
short wave
medium frequency
very high frequency
all of the above
⇒ A capacitor can be represented by a capacitance and resistance in parallel. For a good capacitor, this parallel resistance should be
negligible
low
high
very high
⇒ Auto correlation for t = 0 is equal to
average power S of waveform
square of average power S of waveform
half of average power S of waveform
square root of average power S of waveform
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⇒ The resistance of human body is about
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2000 Ω
1000 Ω
200 Ω
⇒ The advantage of transistor over vacuum tube is
no heat is required
small size and light in weight
very low power consumption
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⇒ The impedance 3.2 - j 12 in polar form is given as
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Assertion (A): A synchro control transformer has nearly constant impedance across its rotor terminals.
Reason (R): Rotor of a synchro control transformer is cylindrical so as to give uniform flux distribution.
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⇒ A voltage v = 100 sin (100 pt + 45°) V is applied to an impedance 10 + j10 ohm. The current is
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⇒ Half bridge and full bridge inverters of one type use different commutation methods.
TRUE
FALSE
⇒ For frequency up to 1650 kHz, the transmitting antenna is used a
parabolic dish
vertical antenna
yagi antenna
turnstile antenna
⇒ In FM reception, amplitude disturbances due to static change
reduce the signal frequencies
increase the signal frequencies
disturb the signal frequencies
do not affect the signal frequencies
⇒ Identification of highest priority interrupt can be achieved in a minimum time by which of the following schemes?
Hardwired polling
Priority encode circuit
Software polling
Subdivision of interrupt register into a number of sub registers which are checked parallely
⇒ While obtaining minimal SOP expression
all do not care terms are ignored
all do not care terms are treated as 1
all do not care terms are treated as 0
only such do not care terms which aid minimization are treated as 1
⇒ In a Gunn diode oscillator drift velocity of electron is 10^{7} cm/s and active region length is 10 x 10^{-4} cm. The natural frequency of oscillation is
1 MHz
10 MHz
1 GHz
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⇒ The inverse Fourier transform of δ(t) is
∪(t)
1
δ(t)
e^{j2pt}
⇒ Pico-farad is equal to
10^{-6} farad
10^{-12} farad
10^{-3} farad
10^{-9} farad
⇒ In the given figure, the curves 1, 2, 3 are respectively
all pass, minimum phase and non-minimum phase functions
minimum phase, all pass and non-minimum phase functions
non-minimum phase, all pass and minimum phase functions
minimum phase, non-minimum phase and all pass functions
⇒ The signal input to a given amplifier is made up of 100 mΩ signal power and 1 mΩ noise power. The amplifier contributes an additional 100 mΩ of noise and has a power gain of 20 dB. The input signal-to noise ratio is
2
10
20
100
⇒ In a tungsten filament lamp
the current at the instant of switching is less than operating current
the current at the instant of switching is more than operating current
the current at the instant of switching is equal to operating current
the current at the instant of switching may be less than or equal to operating current
⇒ For Q >> 1, the output frequency of LC oscillator is equal to resonant frequency.
TRUE
FALSE
⇒ In a two terminals network the O.C. voltage measured at the given terminals is 100 V and s.c., currents at the same terminals 5 A. If a load of 80 Ω resistance is connected at the terminals, load current is
0.0416666666666667
1.25 A
0.25
6.25 A
⇒ In figure the output v(t)
an amplitude modulated signal
a frequency modulated signal
a phase modulated signal
none of the above
⇒ The number of free electrons in acceptor atom is
1
2
3
4