How many white cubes are there in the given structure?
SSC JE Electrical Engineering 2012
For the following questions answer them individually
In the following Venn diagram, identify the number which denotes Doctors who know both Swimming and Dancing.
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Which one of the following diagramsbest depicts the relationship among College Graduates, Professional Athletes and Great Scientists?
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Two statements are given followed by two conclusions I and II. You have to consider the statements to be true even if they seem to be at variance from commonly knownfacts. You
are to decide which of the given conclusions, if any, follow from the given statments.
Statements:
Mind is a stream of thoughts.
Mind is working all the time.
Conclusions:
I: If there is no thought, there is no mind.
II: Thoughtless people will not succeed.
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Statements:
Teachers should have empathy.
Students need empathetic approach from their teachers.
Conclusions:
I: Persons without empathy cannot become good teachers.
II: Good teachers understand the problems of their students.
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Which answer figure will complete the pattern in the question figure?
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Select the answer figure in which the question figure is hidden/embedded.
A piece of paper is folded and punched as shown below in the question figures. From the given answer figures, indicate how it will appear when opened?
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Which of the answer figure is exactly the mirror image of the given figure, when the mirror is held on the line AB?
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A word is represented by only one set of numbers as given in any one of the alternatives. The sets of numbers given in the alternatives are represented by two classes of alphabets as in two matrices given below. The columns and rows of matrix I and II are numbered from 0 to 4.A letter from these matrices can be represented first by its row and next by its column,e.g., ‘A’ can be represented by 24, 31 etc. and ‘P’ can be represented by 11, 32, etc. Identify the set for the letters AELO.
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Select the related word/letter /number/figure from the given alternatives.
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? : JHKI :: TRUS : OMPN
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AEJO : ZVQL :: DINS : ?
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IRTH : HQSG :: ? : RQPO
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16 : 64 :: 25 : ?
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5 : 15 :: 40 : ?
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Select the one which is different from the other three responses.
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Arrange the given words in the order in which they occur in the dictionary and find the last but one word:
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Arrange the following wordsin the orderin which they occur in the dictionary. Which will appear fourth in the dictionary ?
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Arrange the following words in the orderin which they occurin the Dictionary :
1. Interview
2. Inventory
3. Invention
4. Interval
5. Investment
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Choose the correct alternative from the given responses that will complete the series:
xy, wy, xy, ut, xy, ?
PQR, HIJ, DEF, ?
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NDB, LED, JGG, ?
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18, 54, 162, 486, 1458, ?
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20, 30, 42,56, 72, ?
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Find the wrong number in the given series:
7, 15, 32, 65, 138
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A party consisted of a man, his wife, his three sons and their wives and three children in each son’s family. How many werethere in the party ?
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₹ 6,500 were divided equally among a certain number of persons. Had there been 15 more persons, each would have got ₹ 30 less. Find the original numberof persons.
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From the following alternatives, select the word which cannot be formed using the letters of the given word :
UNIVERSITY
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In a certain code MEN is written as MIN and WOMEN is written as WUMIN,then how will CHILD be written in the same code?
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If Y = 2, PEN = 11 - 22 - 13, then 10 - 6 - 18 - 24 - 16 = ?
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Find out the number which belongsto the given group of number from thefour alternatives.
5, 25, 90, 35, 60
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If $$+$$ stands for division
$$-$$ stands for equai to
$$\times$$ stands for addition
$$\div$$ stands for greater than
$$=$$ standsfor less than
$$>$$ stands for multiplication
$$<$$ stands for subtraction
then of the given alternatives which one is correct?
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Select the missing number from the given responses.
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Going 60 metresto the South of his house, Kiran turns left and goes another 20 metres then turning to the North, he goes 40 metres and then starts walking to his house. In which direction is his house. In which direction is his house from there ?
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Ram started walking towards East. After 1 km, he turned South and walked 5 km. Again he turned East and walked 2 km. Finally, he turns to the North and walked 9 km. How faris he from the starting point ?
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Four positions of a cube are shown below. If symbol Sun is at the top, what symbol will be at the bottom ?
'Liver rot' is caused by
"Proconvertin" is an example of
If the filament current of a coolidgetube is increased, X-rays emitted from it will be ofgreater
The ideaofstationary orbit of electrons in an atom was first introduced by
Which of the following pairs of particles have equal and opposite charge ?
In 'Isobaric process', which parameter remains constant ?
A prototype of a system is
An example of a mathematical function in Structured Query Language (SQL) is
Theintensity of sound is measured in dB-scale and the threshold of hearing is
PAN is pollutantof air. The full name of PAN is
Repeated exposure to small concen-trations of a toxic agent results in accu-mulation of toxic substance over a period of time. This is known as
Which one of these element is NOT considered an essential trace element for the biosphere ?
The term epicenture is associated with
How many countries participated in the first Twenty-20 World Cup in South Africa ?
Which one amongthefollowing is the National Fruit ?
Which language is spoken by maximum number of people in the world?
Name the dome shaped monumentused-to keep Buddhist relics.
‘KIMONO’ is a dressstyle of
Which one of the following famous mon-uments was built to honour the visit of King George V and Queen Mary to India ?
Tulsidas wasthe author of
The study of coins is called
Which amongthe following is not a classical Indian dance ?
The colour of potassium flame through double blue glass is
Precipitation takes place when product of concentration of ions
Dry ice is
Poisoning of drinking water is caused due to presence of
Which institute is known as apex body for development of agriculture ?
The duration for which a patent rightis valid is known as
The concept of supply curve as it is used in economic theory is relevant only for the case of
When the prices of two goods tend to vary inversely, they are said to be
Purchase of cycle by a Household is treated as
Ina Unitary Government, the States derive their powers from
The theory of naturalrights was first enunciated by
Individualism is also known as
Parliamentary Government is called
Fundamental Duties were laid down by
Simon Commission was boycotted because
The Nayanars belonged to the
Name the Sufi Saint with whom Akbar, the Mughal Emperor, is associated:
The Vaisheshika School of Physics propounded the atomic theory during the period of
Who set up aseparate department called the Diwan-i-Khairat?
Birmingham is an Industrial Centre of
Acrescent shaped sand dune is known as
Whichis an ore of dolomite?
Stalactites and stalagmites are found mainly in
Which one of the following is the oldest and deepest fresh waterlake in the world?
Which one of the following plants shows vivipary?
The kind of inflorescence in sunflower is
Moulting in insects is mainlys controlled by
Silver fish is included in the phylum
Which one of the following is correct ?
A lap wound DC generator having 250 armature conductor runs at 1200 rpm. If the generator emf is 200 V, then the operating flux of the DC generator is
The highest speed attainable by DC shunt motor is
The direction of rotation of a DC shunt motor can be reversed by interchanging
AC series motors are built with as few turns as possible to reduce
Based on revolving field theory, the forward and backward frequencies of the rotor emf of a 4-pole, 50 Hz, single-phase induction motor when running at 1300 rpm in the same direction of the forward field are respectively
Three lamps are in circuit as shown in figure. At what condition 100 W lamp will have the maximum brightness?
Given two coupled inductors $$L_1$$ and $$L_2$$ having their mutual inductance M. The relationship among them must satisfy
If the length of a bar of magnetic material is increased by 20% and the cross-sectional area is decreased by 20% then the reluctance is
Two coupled inductors $$L_1 = 0.2 H$$ and $$L_2 = 0.8 H$$, have coefficient of coupling K = 0.8, The mutual inductance M is
A coil with a certain number of turns has a specified time constant. If the number of turns is doubled, its time constant would
The iron loss per unit frequency in a ferromagnetic core, when plotted against frequency, is a
The mutual inductance between two closely coupled coils is 1 H. If the turns of one coil is decreased to half and those of the other is doubled, the new value of the mutual inductance would be
Following graph shows the loss characteristics of a sheet of ferromagnetic material against varying frequency f. $$P_i$$ is the iron loss at frequency f, Hysteresis and eddy current losses of the sheet at 100 Hz are
Hysteresis losses are present in iron core coil when
Eddy current loss in ferromagnetic core is proportional to
Two inductors have self inductances of 9 mH and 25 mH. The mutual inductance between the two is 12 mH. The coefficient of inductive coupling between the two inductors is
The magnetic materials that are used to prepare permanent magnets should have
Poles of dc machines are often laminated to reduce
Universal motor is a _______ motor
Which of the following motors can work satisfactory on both AC and DC?
Two alternators rated 40 MVA and 60 MVA respectively are working in parallel and supplying a total load of 80 MW. Speed
Slip of a 3-phase induction motor may be expressed as
The emf induced per phase in a three phase star connected synchronous generator having the following data
Distribution factor = 0.955
Coil-span factor = 0.966
Frequency = 50 Hz
Flux per pole = 25 mwb
Turns per phase = 240
emf per phase is
In a 1-phase transformer, the copper loss at full load is 600 W. At half of the full load the copper loss will be
An auto-transformer used with a sodium vapour lamp should have high
In an auto-transformer, the number of turns in primary winding is 210 and in secondary winding is 140. If the input current is 60 A, the currents in output and in common winding are respectively
A 3-phase transformer has its primary connected in delta and secondary in star. Secondary to primary turns ratio per phase is 6. For a primary voltage of 200 V, the secondary voltage would be
A resistance and another circuit element are connected in series across a DC voltage V. The voltage across the second element is V initially and zero after time. The other element is pure
For RLC AC series circuit at resonance the current is
A series R-L-C circuit resonates at 1 MHz. At frequency 1.1 MHz the circuit impedance will be
The equivalent resistance between terminals X and Y of the network shown is
Application of Thevenin’s Theorem in a circuit results in
A current of $$i = 6 + 10 \sin (100 \pi t) + 20 \sin (200 \pi t)$$ is flowing through a series combination of a PMMC and moving iron instrument. Ratio of the two currents as registered by the M.I. and PMMC meter is
Three resistances 5 Ω each are connected in star. Values of equivalent delta resistances are?
A 120 V, 60 W incandescent lamp has to be operated from 220 V, 50 c/s, 1-phase AC supply. In order to do this, a circuit element has to be connected in series with the lamp. Which one of the following series element is preferable ?
The bandwidth of an ac series circuit consisting of R, L and C is
For balanced 3-phase supply system, the phasor sum of the line currents is NOT zero if the load is
At series resonance of an ac R-L-C circuit the impressed voltage is
In a series RLC circuit R = 20 Ω , $$X_L = 30$$ Ω and $$X_c = 30$$ Ω If the supply voltage across the combination is $$v = 100 \sin (100 \pi t + 30^\circ)$$ volts, the instantaneous current and the power factor of the circuit are respectively
The rms of the alternating current given by the equation $$i = 50 \sin (314t - 10^\circ t) + 30 \sin (314t - 20^\circ)$$ is
A series RLC circuit will have unity power factor if operated at a frequency of
In a balanced 3-phase system, the current coil of a wattmeter is inserted in line 1 and the potential coil across 2 and 3. If the wattmeter reads 100 W, the reactive power drawn by the 3-phase load is
An electric iron is rated at 230 V, 400 W, 50 Hz. The voltage rating 230 V refers to
A non-sinusoidal periodic waveform is free from DC component, cosine components and even harmonics. The waveform has
A periodic train of rectangular pulses x(t) with a time period of 25 seconds, has a pulse width of 9 seconds as shown in figure. The RMS value of the waveform is
The time constant of the network shown in the figure is
In the series RC circuit, the voltage across C starts increasing, the moment the circuit is switched to V volts DC. The rate of increase of voltage across C at the instant just after the switch is closed (i.e. at $$t = 0^{+}$$) is
Form factor of an alternating wave is
The phase difference between the following voltage and current waves $$v = 311 \sin (100 \pi t + 30^\circ)$$ Volts $$i = 17 \sin (100 \pi t - 20^\circ)$$ Amps is
Match the items given in List-I (Material) and those in List-II (Temperature Coefficient of Resistance). Select your answers using codes given in the lists
Which of the following material posses the least resistivity?
The resistances of insulations, in general, _____ with temperature rise
A $$10 \mu F$$ and a $$20 \mu F$$ capacitor are in series. The combination is supplied at 150 V from a sinusoidal voltage source. The voltage across the $$20 \mu F$$ capacitor is then
The conditions at which the following potential divider is independent of frequency, may be
(i) $$\frac{R_1}{R_2} = \frac{C_1}{C_2}$$
(ii) $$\frac{R_1}{R_2} = \frac{C_2}{C_1}$$
(iii) $$R_1C_1 << 1, R_2C_2 << 1$$
(iv) $$R_1 + R_2 = \frac{1}{C_1} + \frac{1}{C_2}$$
Which of the following is the best conductor of electricity ?
SI unit of Electrical Energy is
The wave shape of current flowing through an inductor is
The wave shape of voltage drop (v) across the inductor is
Two wires A and B of the same material but of different lengths L and 2L have the radius r and 2r respectively. The ratio of specific resistance will be
A 20 micro farad capacitor is connected across an ideal voltage source. The current in the capacitor
In general, if a sine wave is fed into a Schmitt trigger, the output will be
In the given circuit the function of the diode D is
FET are
In the circuit forward resistance of the diode D is 2 Ω and its reverse resistance is infinitely high
A list consists of meters (List-I) and another list shows, the meter readings (Lis-II)
Which one of the options given here is correct to indicate the type of meter (List-I) and its reading (List-II)
In the figure. D in an ideal diode. If the rms value of the input voltage is 50V, then the rms current through 100 Ω is
Which of the following materials is a semiconductor?
In a rectifier circuit, the primary function of the filter is to
In an R-L series circuit R = 20 Ω, L = 0.056 H and the supply frequency in f = 50 Hz. The magnitude of impedance of the circuit is
A pure sinusoidal current is being rectified. For the given maximum value of sinusoidal current if rms value of half wave rectified current is 50 A, then the rms value of full wave rectification will be
Under thermal equilibrium in a pure semiconductor the ratio of the number of holes to the number of conduction electrons is
As per IE rules the maximum allowable variation between declared and actual voltage at consumer's premised should be
Alternator used in hydel power station has more number of poles in it than used in thermal power station, because
The connected load of a comsumer is 2kW and the maximum demand is 1.5kW. The demand factor of the consumer is
In a thyrite lightning arrester the resistance
A consumer is offered the following rate of tariff. He has to pay a fixed charge of Rs. 1,000 per month and a running charge of Rs. 4.50 per unit consumed. If the consumer runs a motor load of 1kW at 0.85 power factor lagging on an average of 15 hours per day, his annual bill is
Glare is caused due to
Which of the following method is suitable for heating of conducting medium?
Furnaces used for cremation use
In a fluorescent tube circuit high voltage surge is produced by
In AC operated electromechanical contractors, the problem of chattering is eliminated by
Magnetic blowout coils are generally used in
The pitch factor for a full pitched winding of a synchronous machine is
An AC meter of resistance $$R_m$$ and resistance $$X_m$$ is connected in series with a resistance $$R_s$$. A shunt of impedance $$(R_{sh} + jX_{sh})$$ is applied in parallel to the existing combination of meter and $$R_s$$. The current division across the two branches will be independent of frequency when
In phantom loading arrangement, energy consumption in the calibration test of wattmeter is reduced because of
In the measurement of power in a balanced 3 - phase circuit bt two-wattmeter method if the two wattmeters show equal readings, then the power factor of the circuit is
Two meters X and Y required 40mA and 50mA respectively for fully scale deflection. Then
The household energy meter is
A Ballistic galvanometer of constant equal to 1 micro-coulomb/degree gives a throw of $$22.5^\circ$$, when a capacitor discharges through the meter. If a battery of 15V is used to recharge the capacitor, value of capacitance is
A potentiometer is used to measure the voltage between two points of a DC circuit, which is found to be 1.2V. This is also measured by a voltmeter, which is found to be 0.9V. The resistance of the volt meter is 60 kΩ. The input resistance between two points
A load is connected to supply. A current transformer (CT), and a potential transformer (PT) is used in between load and supply. A power factor of 0.5 is measured at the secondary side of CT and PT . If phase angle error of CT and PT are $$0.4^\circ$$ and $$0.7^\circ$$, power factor of the load is
During the measurement of a low resistance using a potentiometer, the following readings were obtained: Voltage drop across unknown resistance = 0.531V. Voltage drop across a 0.1Ω standard resistance connected in series with the unknown = 1.083V. Value of the unknown resistor is
Which one of the following types of instruments does suffer from error due to magnetic tysteresis?
Which one of the following does not employ a null method of measurement?
In star-delta starting of three-phase induction motor the starting voltage is reduced to
An electromagnetic torque is produced as an interaction between a flux and current. The angle between flux and current is $$45^\circ$$. If this angle is change to 30, flux increases by 100% and current reduces by 25%, then the torque
Mamimum temperature limit for class F insulation is
Match List-I (Types of motors) with List-II (Characteristics) and select the appropriate response
The motor characteristics best suited for traction purpose are those of
If the starting torque of a 3-phase induction motor is $$T_{st}$$ for DOL starting, that star-delta starting of the motor is
The iron loss in a 100 KVA transformer is 1kW. and at full load copper loss is 2 kW. The maximum efficiency occurs at a load of
