Users Also Read
MCQ's Search Engine
Electrical Engineering
Mechanical Engineering
Civil Engineering
Automobile Engineering
Chemical Engineering
Computer Engineering
Electronics Engineering
Medical Science Engg
Assertion (A): A half wavelength line can be used as a 1 : 1 transformer. Reason (R): The input impedance of a half wavelength line is equal to load impedance. | |
A. | Both A and R are correct and R is correct explanation of A [Correct Answer] |
B. | Both A and R are correct but R is not correct explanation of A [Wrong Answer] |
C. | A is correct but R is wrong [Wrong Answer] |
D. | A is wrong but R is correct [Wrong Answer] |
View Answer
Explanation:-
Answer : A Discuss it below : !! OOPS Login [Click here] is required to post your answer/result |
Also Read Similar Questions Below :
⇒ In a receiver, which of the following device has RF input but IF output?
Loudspeaker
Frequency changer
Demodulator
Audio amplifier
⇒ A network is said to be two port network if there is
1, 2, 3
3, 4, 2
1, 3, 4
4, 3, 1, 2
⇒ For an n-channel enhancement type MOSFET, if the source is connected at a higher potential than that of the bulk (V_{SB} > 0), the threshold voltage V_{T} of the MOSFET will
remain unchanged
decrease
change Polarity
increase
⇒ In a microwave coaxial cable the inner conductor radius is a and inner radius of outside conductor is b. For TE_{11} mode the cut off wavelength is about
a + b
p(a + b)
pa
pb
⇒ The spectrum of the white noise and an impulse function is similar in following aspects
both have similar magnitude spectrum
both have similar magnitude and Phase spectrum
no relation
similar phase spectrum
⇒ A clamper
adds a dc component to the input signal
removes signal voltages above or below a specified value
both (a) and (b)
either (a) or (b)
⇒ A 3 kV circuit uses SCR of 800 V rating. If derating is 25%, the number of SCRs in series is
4
5
6
8
⇒ Waves of frequencies higher than 30 MHz penetrate the atmosphere.
TRUE
FALSE
⇒ Which of the following theorems can be conveniently used to find power consumed in 10 Ω resistor in fig
Thevenin theorem
Maximum power transfer theorem
Millman's theorem
Superposition theorem
⇒ The open loop gain of an ideal op-amp is
infinite
very high
neither high nor low
low
⇒ Tesla is a unit of
flux
field strength
flux density
MMF
⇒ In telephone systems, load is expressed in the unit of
erlangs
decibels
bells
watts
⇒ Two thyristor of same rating and same specifications
will have equal turn on and turn off periods
will have equal turn on but unequal turn off periods
may have equal or unequal turn on and turn off periods
will have unequal turn on and turn off periods
⇒ The minimum step size required for a Delta modulator operating at 36 samples/sec to track the signal (here u(t) is the unit step function) x(t) = 125t (u(t) - u(t - 1)) + (250 - 125t) (u(t - 1) - u(t - 2)) So that slope overload is avoided, would be
2^{-10}
2^{-8}
2^{-6}
2^{-4}
⇒ Crompton potentiometer has
14 coils and a slide wire all having the same resistance
14 coils and a slide wire but the resistance of slide wire is half that of each coil
14 coils each of different resistance
14 coils out of which 7 coils have resistance which is twice that of remaining 7 coils
⇒ Noise temperature of Sun is more than __________ °K.
1000
5000
100000
500
⇒ In an ac network, Thevenin's impedance and Norton's impedance are
always the same
generally the same
sometimes the same
always different
⇒ Consider the following DO statement in Fortran 771
10
3
4
⇒ The resistance of series field winding is a low resistance.
TRUE
FALSE
⇒ A resistance of 5 ohms is connected in one branch of a network. The current in this branch is 2.2. A. If the resistance is increased to 7.5 Ω, the remaining circuit being the same, the current in this branch will be
2.2 A
less than 2.2 A
2.2 A or less than 2.2 A
2.2 A or less or more than 2.2 A
⇒ In EPROM integrated dose is defined as
UV light intensity x exposure time in seconds
UV light intensity / exposure time in seconds
exposure time in seconds / UV light intensity
none of the above
⇒ A periodic voltage has following values for equal time intervals changing suddenly from one value to next : 0, 5, 10, 20, 50, 60, 50, 20, 10, 5, 0, - 5, - 10
31 v
32 v
insufficient data
none of these
⇒ A sheet of bakelite is inserted between the plates of an air capacitor. The capacitance will
increase
decrease
remain the same
may increase or decrease
⇒ A band limited signal is sampled at the Nyquist rate. The signal can be recovered by passing the samples through
an RC filter
an envelope detector
a PPL
an ideal low pass filter with the appropriate bandwidth
⇒ The band gap of silicon at 300K is
1.36 eV
1.10 eV
0.80 eV
0.67 eV
⇒ In which of the following 8085 instructions no condition flags are affected?
⇒ For the transmission of normal speech, the PCM channel needs a bandwidth of __________ kHz.
2
4
16
32
⇒ The maximum power dissipation capacity of a transistor is 50 mW. If the collector emitter voltage is 10 V, what is the safe collector current that can be allowed through the transistor?
5 mA
2.5 mA
10 mA
25 mA
⇒ If the variance σ_{x}^{2} of d(n) = x(n) - x(n - 1) is one-tenth the variance σ_{x}^{2} of a stationary zero mean discrete time signal x(n), then the normalized autocorrelation function R_{xx}(x)/σ_{x}^{2} at k = 1 is
0.95
0.9
0.1
0.05
⇒ The heat sink disposes off heat mainly by
radiation
natural convection
forced convection
conduction
⇒ In a receiver, which of the following device has RF input but IF output?
Loudspeaker
Frequency changer
Demodulator
Audio amplifier
⇒ A network is said to be two port network if there is
- no independent source in the network
- no dependent source in the network
- non-linear component in the circuit
- no external connection exist between I/P and 0/P
1, 2, 3
3, 4, 2
1, 3, 4
4, 3, 1, 2
⇒ For an n-channel enhancement type MOSFET, if the source is connected at a higher potential than that of the bulk (V_{SB} > 0), the threshold voltage V_{T} of the MOSFET will
remain unchanged
decrease
change Polarity
increase
⇒ In a microwave coaxial cable the inner conductor radius is a and inner radius of outside conductor is b. For TE_{11} mode the cut off wavelength is about
a + b
p(a + b)
pa
pb
⇒ The spectrum of the white noise and an impulse function is similar in following aspects
both have similar magnitude spectrum
both have similar magnitude and Phase spectrum
no relation
similar phase spectrum
⇒ A clamper
adds a dc component to the input signal
removes signal voltages above or below a specified value
both (a) and (b)
either (a) or (b)
⇒ A 3 kV circuit uses SCR of 800 V rating. If derating is 25%, the number of SCRs in series is
4
5
6
8
⇒ Waves of frequencies higher than 30 MHz penetrate the atmosphere.
TRUE
FALSE
⇒ Which of the following theorems can be conveniently used to find power consumed in 10 Ω resistor in fig
Thevenin theorem
Maximum power transfer theorem
Millman's theorem
Superposition theorem
⇒ The open loop gain of an ideal op-amp is
infinite
very high
neither high nor low
low
⇒ Tesla is a unit of
flux
field strength
flux density
MMF
⇒ In telephone systems, load is expressed in the unit of
erlangs
decibels
bells
watts
⇒ Two thyristor of same rating and same specifications
will have equal turn on and turn off periods
will have equal turn on but unequal turn off periods
may have equal or unequal turn on and turn off periods
will have unequal turn on and turn off periods
⇒ The minimum step size required for a Delta modulator operating at 36 samples/sec to track the signal (here u(t) is the unit step function) x(t) = 125t (u(t) - u(t - 1)) + (250 - 125t) (u(t - 1) - u(t - 2)) So that slope overload is avoided, would be
2^{-10}
2^{-8}
2^{-6}
2^{-4}
⇒ Crompton potentiometer has
14 coils and a slide wire all having the same resistance
14 coils and a slide wire but the resistance of slide wire is half that of each coil
14 coils each of different resistance
14 coils out of which 7 coils have resistance which is twice that of remaining 7 coils
⇒ Noise temperature of Sun is more than __________ °K.
1000
5000
100000
500
⇒ In an ac network, Thevenin's impedance and Norton's impedance are
always the same
generally the same
sometimes the same
always different
⇒ Consider the following DO statement in Fortran 77
10
3
4
⇒ The resistance of series field winding is a low resistance.
TRUE
FALSE
⇒ A resistance of 5 ohms is connected in one branch of a network. The current in this branch is 2.2. A. If the resistance is increased to 7.5 Ω, the remaining circuit being the same, the current in this branch will be
2.2 A
less than 2.2 A
2.2 A or less than 2.2 A
2.2 A or less or more than 2.2 A
⇒ In EPROM integrated dose is defined as
UV light intensity x exposure time in seconds
UV light intensity / exposure time in seconds
exposure time in seconds / UV light intensity
none of the above
⇒ A periodic voltage has following values for equal time intervals changing suddenly from one value to next : 0, 5, 10, 20, 50, 60, 50, 20, 10, 5, 0, - 5, - 10
31 v
32 v
insufficient data
none of these
⇒ A sheet of bakelite is inserted between the plates of an air capacitor. The capacitance will
increase
decrease
remain the same
may increase or decrease
⇒ A band limited signal is sampled at the Nyquist rate. The signal can be recovered by passing the samples through
an RC filter
an envelope detector
a PPL
an ideal low pass filter with the appropriate bandwidth
⇒ The band gap of silicon at 300K is
1.36 eV
1.10 eV
0.80 eV
0.67 eV
⇒ In which of the following 8085 instructions no condition flags are affected?
INX rp
INR r
SBI data
INR M
⇒ For the transmission of normal speech, the PCM channel needs a bandwidth of __________ kHz.
2
4
16
32
⇒ The maximum power dissipation capacity of a transistor is 50 mW. If the collector emitter voltage is 10 V, what is the safe collector current that can be allowed through the transistor?
5 mA
2.5 mA
10 mA
25 mA
⇒ If the variance σ_{x}^{2} of d(n) = x(n) - x(n - 1) is one-tenth the variance σ_{x}^{2} of a stationary zero mean discrete time signal x(n), then the normalized autocorrelation function R_{xx}(x)/σ_{x}^{2} at k = 1 is
0.95
0.9
0.1
0.05
⇒ The heat sink disposes off heat mainly by
radiation
natural convection
forced convection
conduction