Set 2 of 3 in the Electrical Engineering subject series — 75 solved MCQs taken only from verified past papers and solved sets. Questions shuffle on every attempt, and if you leave in the middle, your picked answers are saved in your own browser so you can continue where you left off. Tap one option per question, then press Check Answers for your score.
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Transient state stability is generally improved by:
Correct answer: Using high speed governors on machines.
The number of cycles in which a high speed circuit breaker can complete its operation is:
Correct answer: 3 to 8.
If the firing angle in an SCR rectifier is decreased, output will be?
Correct answer: Increased.
Fourier series are infinite series of elementary trigonometric functions i.e. Sine and?
Correct answer: Cosine.
A copper oxide _______________ allows current to flow through a meter in only one direction?
Correct answer: Rectifier.
Stepper motor is a/an _______________ which divides full rotation into a large number of steps?
Correct answer: Direct Current.
Which instrument has the same calibrations for both AC and DC values?
Correct answer: Hot wire type.
As compared to oscillators, inverters provide?
Correct answer: Low frequency output.
A ________ can be used to make an automated potentiometer in comparison measurements?
Correct answer: Digital to analog converter.
The potential difference between the two similar charges?
Correct answer: Nil.
In a power plant, coal is carried from storage place to boiler generally by means of?
Correct answer: V-Belts.
Noise in resistance depends upon?
Correct answer: Operating temperature.
In a parallel resonance circuit, at resonance?
Correct answer: Voltage is maximum.
The radius of curvature of the path of a charged particle in a uniform magnetic field is directly proportional to?
Correct answer: Particle's momentum.
The elements which absorb the energy are called "Passive Elements" like Resistance, inductance and?
Correct answer: Capacitance.
A bridge which is used for the measurement of capacitance of an insulator?
Correct answer: Shearing bridge.
A large size alternator is protected against overloads by providing?
Correct answer: Over current relays.
The ratio error of a current transformer is due to the presence of?
Correct answer: Exciting currents.
In a radio receiver:
Correct answer: RF stage has effect on S/N ratio.
Hot wire anemometers are used to measure?
Correct answer: Velocity of air stream.
The letter DPDT is for?
Correct answer: Switch.
In transmission lines, the curve between discharge in m3/sec and time is called?
Correct answer: Hydrograph.
Power plants using coal work closely with which of the following cycle?
Correct answer: Rankine cycle.
The air standard efficiency of a diesel engine depends upon?
Correct answer: Compression ratio.
Coking is:
Correct answer: Formation of lumps or masses of coke in boiler surface at high temperatures.
Deuterium oxide is used in nuclear reactors as?
Correct answer: Moderator.
The surge resistance of transmission lines is about?
Correct answer: 400 ohm.
In high voltage transmission lines, the top most conductor is?
Correct answer: Earth conductor.
Skin effect in transmission line is proportional to?
Correct answer: (Diameter of conductor)2.
Shunt capacitance is usually neglected in the analysis of?
Correct answer: Short transmission lines.
In order to reduce the skin effect at UHF?
Correct answer: Copper tubes with silver plating are used.
Transmission lines link:
Correct answer: Generating station to receiving end station.
The square law of a photodetector gives current. This current is proportional to _______ of the combined optical field?
Correct answer: Square.
The _________ is an electromagnetic carrier wave which is modulated to carry information?
Correct answer: Light.
Out of the following which one is not the unconventional source of energy?
Correct answer: Nuclear energy.
In case the height of the transmission tower is increased:
Correct answer: The line capacitance will decrease and line inductance will increase.
The instrument which is used for DC measurement alone is?
Correct answer: Permanent magnet type.
Conductors have an excess of?
Correct answer: Free electrons.
Super heated steam is always?
Correct answer: At a temperature higher than the saturation temperature corresponding to a steam pressure.
A tunnel diode is:
Correct answer: A heavily doped PN junction device.
Potential has a unit?
Correct answer: Volt.
The turn on voltage of a germanium diode is?
Correct answer: 0.3 V.
Steam engine used in a locomotive is?
Correct answer: Single acting, non-condensing type.
Pressure of steam in the condenser is?
Correct answer: Much less than pressure.
Which comparison is correct between a fluorescent lamp and a filament bulb?
Correct answer: Average life of a fluorescent lamp is five to seven times higher.
To carry a current of 100 RMS, the area of the Aluminum bus bar must be at least?
Correct answer: 25 mm2.
A short transmission line has an equivalent circuit consisting of?
Correct answer: Series resistance R and series inductance L.
The peak value of the power angle curve of a transmission line is 50 MVA. If two such identical lines are added in parallel, the resulting peak value is?
Correct answer: 100 MVA.
Phase modifier is normally installed in case of?
Correct answer: Long transmission lines.
For stability and economic reasons, we operate the transmission line with a power angle in the range of?
Correct answer: 30 to 45.
How many roots does a quadratic equation have?
Correct answer: 2.
Which operation is not performed on independent variables?
Correct answer: Amplitude scaling.
How many interrupts does the 8085 microprocessor have?
Correct answer: 5.
The ratio of collector current to the reverse saturation current is known as?
Correct answer: Transistor stability factor.
Conductivity of the wire depends upon?
Correct answer: Free Electron density.
For what purpose is a moderator used in nuclear power plants?
Correct answer: Reduce the speed of neutrons.
Silicon has its atomic number 14, its valency is?
Correct answer: 4.
Memory locations that are used temporarily during program execution from R/W memory?
Correct answer: Register.
Semiconductors belong to which group of the periodic table?
Correct answer: Group IV A.
Which of the following does not use the effect of current for measurement purposes?
Correct answer: Electrostatic ammeter.
The DC equivalent circuit of an amplifier can be obtained by considering the capacitance?
Correct answer: Open circuited.
AC motors are of two types, induction motor and?
Correct answer: Synchronous motor.
A system that can recover its input from its output signal is known as?
Correct answer: Invertible system.
As steam expands in a turbine:
Correct answer: Its specific volume increases.
Step-up substations are associated with?
Correct answer: Generating stations.
Which of the following is not installed in a substation?
Correct answer: Exciters.
DC generators have ________ on rotating shafts that convert AC into DC?
Correct answer: Commutators.
Which of the following is the stationary part of electrical machines?
Correct answer: Stator.
Schmitt trigger produces ___________ at the output when the input applies a sine wave?
Correct answer: Square wave.
If a network satisfies homogeneity condition as well as superposition condition, then it is said to be?
Correct answer: Linear system.
Piezo-electric crystal is used to measure?
Correct answer: Acceleration.
Which of the following transducer does not convert velocity to pressure?
Correct answer: Vanes.
In a synchronous motor, rotor current is provided by?
Correct answer: DC Current source.
In a shunt type ohmmeter, the full scale deflection position of the pointer is marked:
Correct answer: Infinity.
Two bulbs rated 25 W, 110 V and 100 W, 110 V are connected in series to a 220 V supply. What will happen?
Correct answer: The 25 W bulb will burn out.
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