A 90 Ω resistor, a coil with 30 Ω of reactance, and a capacitor with 50 Ω of reactance are in series across a 12 V ac source. The current through the resistor is
1.9 mA
2.90 mA
3.13 mA
4.130 mA
An Astronomical Unit, or AU, is the average distance between
1. The Sun and Neptune
2.The Sun and Earth
3.The Earth and the Moon
4. The Sun and Mercury
During an atomic explosion, the energy released is due to
1.Conversion of protons to neutrons
2.Conversion of chemical energy into heat energy
3.Conversion of mechanical energy into nuclear energy
4.Conversion of mass into energy
In a diode, when there is saturation current, the plate resistance is
1.Zero
2.Infinite
3.Some finite quantity
4.Data is insufficient
In a triode valve
1.If the grid voltage is zero then plate current will be zero
2.If the temperature of the filament is doubled, then the thermionic current will also be doubled.
3.If the temperature of the filament is doubled, then the thermionic current will nearly be four times
4.At a definite grid voltage, the plate current varies with plate voltage according to Ohm’s law
Kepler’s 2nd law deals with
1.The shape of the planet’s orbits
2.The speed/area the planet travels
3.The length of time it takes the planet to orbit the sun
4.Time travel
Kepler’s first law states that the orbits of the planets are oval in shape or
1.Ellipses
2.Perfect circles
3.Squares
4.triangles
The grid voltage of any triode valve is changed from 1 volt to 3 volt and the mutual conductance is 3 x 10-4 mho. The change in plate circuit current will be
1.0.8 mA
2.0.6 mA
3.0.4 mA
4.1 mA
Which among the following statement is the definition of a pseudoplastic liquid?
1.It is a liquid that becomes less viscous over time when constant shear stress is applied
2.As the rate of shear increases, it becomes less viscous
3.When constant shear stress is applied the liquid becomes more viscous over time
4.A liquid which becomes more viscous as the rate of shear increases
A 15 Ω resistor, an inductor with 8 Ω inductive reactance, and a capacitor with 12 Ω capacitive reactance are in parallel across an ac voltage source.
1.12.7 Ω
2.127 Ω
3.4.436 Ω
4.6,174 Ω
A 15 kΩ resistor, a 220 μH coil, and a 60 pF capacitor are in series across an ac source. What is the bandwidth of the circuit?
1.138 MHz
2.10,866 Hz
3.1,907 Hz
4.138 kHz
A 6.8 kΩ resistor, a 7 mH coil, and a 0.02 μF capacitor are in parallel across a 17 kHz ac source. The coil’s internal resistance Rw is 30 Ω. The equivalent parallel resistance, Rp (eq) i
1.1,878 Ω
2.18,780 Ω
3.18,750 Ω
4.626 Ω
A transmission line has a voltage of 24 V and a conduction current of 1.2 A. What will its receiving impedance?
1.25.2
2.22.8
3.28.8
4.20
An inductor with a reactance of 120 Ω, a capacitor with a reactance of 120 Ω and a 24 Ω resistor are in series across a 60 V source. The circuit is at resonance. The voltage across the inductor is
1.60 V
2.660 V
3.30 V
4.300 V
An oscillator employs ……………… feedback
1.Positive
2.Negative
3.Neither positive nor negative
4.Data insufficient
An oscillator produces……………. oscillations
1.Damped
2.Undamped
3.Modulated
4.None of the above
For a given plate voltage the plate current in a triode is maximum when the potential of
1.The grid is positive and the plate is negative
2.The grid is positive and the plate is positive
3.The grid is zero and the plate is positive
4.The grid is negative and the plate is positive
If the resistance in parallel with a parallel resonant circuit is reduced, the bandwidth
1.Disappears
2.Becomes Sharper
3.Increases
4.Decreases
In a series RLC circuit that is operating above the resonant frequency the current (a)
1.Lags the applied voltage
2.Leads the applied voltage
3.Is in phase with the applied voltage
4.Is zero
In a triode amplifier, the value of maximum gain is equal to
1.Half the amplification factor
2.Amplification factor
3.Twice the amplification factor
4.Infinity
In an LC oscillator, the frequency of the oscillator is……………… L or C.
1.Proportional to square of
2.Directly proportional to
3.Independent of the values of
4.Inversely proportional to the square root of
In the circuit of a triode valve, there is no change in the plate current, when the plate potential is increased from 200 volt to 220 volt and the grid potential is decreased from 0.5 volt to 1.3 volt. The amplification factor of the valve is
1.15
2.20
3.25
4.35
Kepler’s second law is known as
1.The Law of Orbits
2.The Law of Areas
3.The Law of Periods
4.The Law of Gravity
Kepler’s third law is known as
1.The Law of orbits
2.The Law of Areas
3.The Law of periods
4. The Law of gravity
Multivibrators belongs to which of the following category?
1.Square wave oscillators
2. Sinusoidal oscillators
3.Ramp wave oscillators
4.Triangular wave oscillators
Name the moderator used in the nuclear reactor?
1.Plutonium
2.Thorium
3.Graphite
4.Berilium
Number of secondary electrons emitted per number of primary electrons depends on
1.Material of target
2.Frequency of primary electrons
3.Intensity
4.None of the above
The amplification factor of a triode is 20. If the grid potential is reduced by 0.2 volt then to keep the plate current constant its plate voltage is to be increased by
1.10 volt
2.4 volt
3.40 volt
4.100 volt
The amplification produced by a triode is due to the action of
1.Filament
2.Cathode
3.Grid
4.plate
The element with the least mass per nucleon is
1.Hydrogen
2.Iron
3.Helium
4.Uranium
The energy we get in nuclear reaction comes from
1.Energy we put into the reactor
2.he mass of the fuel
3.Water
4.The sun
The farther away a planet is from the sun, the …………. it takes it to orbit the sun once
1.Longer
2.Shorter
3.Squares
4. Ellipses
The formula for Kepler’s third law is
1.P3 = a2
2.P3 = a3
3.P2 = a2
4.P2 = a3
The Kepler’s first law is known as
1.The law of orbits
2.The law of areas
3.The law of periods
4.The law of gravity
The maximum impedance of a transmission line 50 ohm and the standing wave ratio of 2.5 is
1.20
2.200
3.125
4.75
The propagation constant of a transmission line with impedance and admittance of 9 and 16, respectively is
1.25
2.100
3.12
4.7
The relative motion between the adjacent layers of a fluid in motion is called viscous force. Which of the flowing suits the best in the sentence?
1. Effects at some conditions
2.Never affects
3.Opposes
4.Facilitates
The release in energy in nuclear fission is consistent with the fact that uranium has
1.More mass per nucleon than either of the two fragments
2.Has more mass per nucleon as the two fragment
3.Has exactly the same mass per nucleon as the two fragments
4.Less mass per nucleon than either of the two fragments
The sinusoidal oscillator is also called
1.LC oscillator
2.Harmonic oscillator
3.RC oscillator
4.Crystal oscillators
The splitting of a nucleus into smaller nuclei is
1.Fusion
2.Fission
3.Half-life
4.gamma -radiation
The standing wave ratio is 4 for a transmission line of 75 ohms. What is the value of the minimum impedance?
1.75
2.300
3.18.75
4.200
The total impedance, expressed in polar form for a certain series RLC circuit with a 200 Hz, 15 V ac source has the following values: R = 12 Ω, C = 80 μF, and L= 10 mH is
1.12.28 ㄥ12.340 Ω
2.12.57 ㄥ12.340 Ω
3.9.95 ㄥ12.340 Ω
4.12.62 ㄥ12.340 Ω
The value of input impedance for a matched line will be equal to
1.Load impedance
2.Characteristic impedance
3.Output impedance
4.Zero
The voltage gain by the triode depends on
1.Filament voltage
2.Plate voltage
3.Plate resistance
4.Plate current
To tune a parallel resonant circuit to a higher frequency, the capacitance should be
1.Increased
2.Decreased
3.Left alone
4.Replaced with inductance
What do we call the maximum velocity of a fluid in a tube for which the flow remains streamlined?
1.Hyper velocity
2.critical velocity
3.Stream velocity
4.Laminar velocity
What happens to the viscosity of liquid with the increase in temperature
1.It increases
2.It decreases
3.No change
4.It may increase or decrease
What has an eccentricity of zero?
1.A straight line
2.A large ellipse
3.A circle
4.A small ellipse
What is the beneficial aspect of nuclear fission?
1.The ability to absorb energy
2.The ability to produce more energy than nuclear fusion
3.The ability to release tremendous amounts of energy
4.There are no beneficial aspects of nuclear fission
What is the normally chosen value of the characteristic impedance of a transmission line?
1.50
2.75
3.50 or 75
4.100
What is the ratio of characteristic impedance to the input impedance if the ratio of load voltage to the input voltage is given as 5
1.1/2
2.5
3.10
4.15
What is the SI unit of viscosity?
1.Candela
2.Poiseiulle
3.Newton/m (
4.No units
What is the value of input impedance of a quarter-wave line 50 ohm and the load impedance of 20 ohms?
1.50
2.20
3.1000
4.125
What is the value of negative sequence impedance?
1.1
2.Z
3.Same as positive sequence
4.infinity
What is the value of resonant frequency if the value of C in a series RLC circuit is decreased?
1.Is not affected
2.Increases
3.Is reduced to zero
4.Decreases
What is the value of the characteristic impedance of a transmission line with impedance and admittance of 16 and 9?
1.25
2.1.33
3.0.75
4.7
When a neutron leaves the nucleus, it’s mass
1.Triples
2.Decreases
3.Increases
4.Stays the same
When a planet orbits the Sun, one of the foci of the elliptical orbit is
1.The axis
2.The perihelion
3.The centre
4.The Sun
Which among the below-mentioned oscillators does not adopt any kind of feedback mechanism?
1.Wein bridge oscillator
2.UJT relaxation oscillator
3.Phase-shift oscillato
4.All the above
Which among the following parameters acts as an initiator for the operation of an oscillator in the absence of input signal?
1.Noise figure
2.Noise voltage
3.Noise power
4.Noise temperature
Which is the following is the correct definition of solubility?
1.The rate at which a solute dissolves into a solvent
2. The ability of a solid particle to disperse throughout a liquid continuous phase
3.The rate at which the immiscible liquid droplets disperse within a second in the liquid phase
4.The ability of a solute to dissolve into a solvent
Which isotope of Uranium has the capacity to sustain the chain reaction?
1.U-230
2.U-235
3.U-245
4.U-225
Which of the following atomic particles have the least mass?
1.Proton
2.Electron
3.Deuteron
4.Neutron
Which of the following is not an example for the non-sinusoidal oscillator?
1.Sawtooth Generators
2.Blocking oscillators
3.Multivibrator
4.Crystal oscillators
Which of the following oscillators cannot be used in low-frequency oscillations?
1.Wein bridge oscillators
2.RC phase shift oscillators
3.Colpitts oscillators
4.RC oscillators
Which of the following represents Kinematic viscosity?
1.Viscosity/temperature
2.Viscosity/area
3.Viscosity/density
4.Viscosity/mass
Which of the following represents viscosity?
1.Potential energy stored in fluid
2.Resistance to fluid motion
3.Roughness of the surface
4.The pressure difference between the two fluids
Which of the following represents viscosity?
1.Potential energy stored in fluid
2.Resistance to fluid motion
3.Roughness of the surface
4.The pressure difference between the two fluids
Which of these fluids has the highest viscosity?
1.Water
2.Honey
3.Blood
4.Air
Which of these ratios gives the value of viscosity of fluid?
1.Ratio of the shearing stress to the weight of the fluid
2.Ratio of the shearing stress to the density of the fluid
3.Ratio of the velocity gradient and shearing stress
4.The ratio of the shearing stress to the velocity gradient