Assertion (A): In an automobile the amount of fuel admitted to the engine is adjusted as per the difference between desired and actual speed. Reason (R): The control signal is the amount of fuel to be admitted to the engine. | |
A. | Both A and R are correct and R is correct explanation of A [Wrong Answer] |
B. | Both A and R are correct but R is not correct explanation of A [Correct Answer] |
C. | A is correct but R is wrong [Wrong Answer] |
D. | R is correct but A is wrong [Wrong Answer] |
View Answer
Explanation:-
Answer : B Discuss it below : !! OOPS Login [Click here] is required to post your answer/result |
⇒ In the self biasing scheme (R_{F} across collector to base) of BJT, S_{1} tends to unity by __________ R_{C} is the collector load Resistance.
increasing R_{F}
decreasing R_{F}
decreasing R_{F} and increasing R_{C}
increasing R_{F} and decreasing R_{C}
⇒ In an R-C circuit, the impedance is 40 Ω at a frequency of 100 Hz. At 200 Hz the impedance should be
40 Ω
80 Ω
20 Ω
more than 20 Ω but less than 40 Ω
⇒ A dc network has 3 independent nodes and 4 loops. In total analysis, the number of equations is
4
3
2
1
⇒ Which of the following functions would have only odd powers of x in its Taylor series expansion about the point x = 0?
sin (x^{3})
sin (x^{2})
cos (x^{3})
cos (x^{2})
⇒ Audio amplifiers need
Bass control
Treble control
Both Bass and Treble control
Either Bass or Treble control
⇒ For a BJT, avalanche multiplication factor depends on
V_{CE}
V_{CB}
V_{BE}
none
⇒ Antenna used for direction finding is
long dipole
parabolic
rhombic
helical
⇒ The resolution of an n bit DAC with a maximum input of 5 V is 5 mV. The value of n is
8
9
10
11
⇒ The relation between thermionic emission current and temperature is known as
Richardson Dushman equation
Langmuir child law
Ohm's law
Boltzmann's law
⇒ A doped semi-conductor is called
impure semi-conductor
dipole semi-conductor
bipolar semi-conductor
extrinsic semi-conductor
⇒ Bandwidth will be
a.b
a + b
a
b
⇒
Assertion (A): The Fourier series of the wave shown in the figure does not contain even harmao
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 true, R is false
A is false, R is true
⇒ If 1 kVA transformer is used for all of the following rectifiers, the d.c. power availability will be least in case of
half wave rectifier
full wave rectifier
bridge rectifier
three phase full wave rectifier
⇒ When a line short circuited at far end, the minimum voltage occurs at
far end
source end
midway between source and far end
none of the above
⇒ A transistor has two p-n junctions. The batteries should be connected such that
both junctions are forward biased
both junctions are reverse biased
one junction is forward biased and the other is reverse biased
none of the above
⇒ Which of the following statement is false?
Bandwidth of a circuit is given by the range of frequencies lying between half-power points
Half-power points on a resonance curve are those points where power is half of that at resonance
Half-power points are also known as 3 dB points
At both half-power points, the p.f. = 0.707 lagging
⇒ The diagram to show distance time history of electrons in klystron amplifier is called
apple gate diagram
asynchronous diagram
bunching diagram
velocity modulation diagram
⇒
List I | List II | ||
---|---|---|---|
A. | loop antenna | 1. | flat line |
B. | folded dipole | 2. | 300 W |
C. | SWR of 1 | 3. | sharp broadside full |
D. | VHF band | 4. | 30 to 300 MHz |
A-1, B-4, C-3, D-4
A-4, B-3, C-2, D-1
A-3, B-2, C-1, D-4
A-2, B-3, C-1, D-4
⇒ In figure the output v(t)
phase modulated signal
amplitude modulated signal
frequency modulated signal
none of the above
⇒ The current I in the circuit show
- j1 A
j1 A
0
20 A
⇒ Drift velocity of electrons is generally less than 1 mm/s.
TRUE
FALSE
⇒ Thevenin's theorem is used to find current in a branch of a network. It is now desired to find current in another branch of the network
the same Thevenin's circuit can be used
the same Thevenin's circuit with some modification can be used
it is necessary to find new Thevenin's circuit
either (b) or (c)
⇒ In a JK flip-flop, J is connected to Q and K is connected to Q outputs. The JK FF converts into a
RS FF
D FF
T FF
Clocked RS FF
⇒ In a bipolar junction transistor the base region is made very thin so that
recombination in base region is minimum
electric field gradient in base is high
base can be easily fabricated
base can be easily biased
⇒ In a pulsed RADAR typical value of pulse duration and pulse frequency respectively are
1 μs and 50 Hz
1 μs and 500 Hz
4 μs and 50 Hz
4 μs and 500 Hz
⇒ Under ordinary circumstances, impulse noise can be reduced in
FM only
AM only
both AM and FM
none of the above
⇒ The number of tightly bound electrons in silicon atom are
14
10
6
4
⇒ Calculate wave impedance for TE mode
(377)Ω
226 Ω
∞
629 Ω
⇒ The logic operations of the two circuits given below
complementary
identical
entirely different
none of these
⇒ If e is the charge of an electron, R is the radius of its orbit and ω is the angular velocity of electron, the magnetic dipole moment μ_{m} of the orbit is |μ_{m}| = eωR^{2}.
TRUE
FALSE