## practice set

### SSC JE ELECTRICAL PRACTICE SET - 7

1.
 Which of the following statements about the force between two charges is true A Unlike charge repel each other B Like charges attract each other C No force exists between two unlike charges D A force of repulsion exists between two like Answer : D Explanation :
2.
 The electrons revolve around the uncleus with height velocity, which type of force acts against the centrifugal force and keeps the electrons in their orbits A Electrostatic force of attraction B Electromagnetic force of attraction C Gravitational force D Adhesive force Answer : A Explanation :
3.
 What is the difference between an atom and an ion A Ions have always larger mass than the atoms of the same element B Ions are neutral particles while atoms always carry a positive charge C Ions have always charged particles while the atoms are neutral as a whole D Ione can only exist in liquid solutions Answer : C Explanation :
4.
 Which particles act as a current in a metallic conductor A Only electrons B Only holes C Both electrons and holes D None of these Answer : A Explanation :
5.
 If the current flows in an anti – clockwise direction, then the polarity of the nearer pole will be  _________ A South pole B No polarity C North pole D Both the polarities Answer : C Explanation :
6.
 The electromagnets is made of  __________ A Soft iron core B Soft iron core with current passing around it C Steel core D Steel core with current passing around it Answer : B Explanation :
7.
 The resistance of a conductor, when its temperature is increased   __________ A Remains constant B Decreases C Varies D Increases Answer : D Explanation :
8.
 In RLC circuits, the electric current at resonance is  ___________ A Maximum in series circuit and minimum in parallel circuit B Maximum in parallel circuit and minimum in series circuit C Maximum in both the circuits D Minimum in both the circuits Answer : A Explanation :
9.
 Which of the following does not have dual relationship A Current – Voltage B Inductance – Capacitance C Tie – Set – Cut – Set D Resistance – Reactance Answer : D Explanation :
10.
 What other of the electric current is also present in the fluorescent lamp and causes losses in the efficiency of the lamp A The chemical effect B The magnetic effect C The heating effect D The chemical and the magnetic effect Answer : B Explanation :
11.
 Frequency multiplication by a resistor can be achieved, if  _________ . A It is carbon B It is wire wound C It is a diode D It is nichrome Answer : C Explanation :
12.
 At time t = 0+ with zero initial condition, which of the following acts as an open circuit  Inductor Capacitor Resistor A Only I B Only II C Only III D I, II and III Answer : A Explanation :
13.
 The elements in  RCL  series circuit are  _________ A Resistance only B Inductance only C Capacitance only D Resistance, inductance and capacitance Answer : D Explanation :
14.
 When a source is delivering maximum power to a load, the efficiency of the circuit  __________ A Is always  50% B Depends on the circuit parameters C Is always  75% D None of these Answer : A Explanation :
15.
 At a frequency less then the resonant frequency A Series circuit is capacitive and parallel circuit is inductive B Series circuit is capacitive and parallel circuit is capacitive C Both circuit are inductive D Both circuit are capacitive Answer : A Explanation :
16.
 The value of current at resonance in a series RLC  circuit is affected by the value of  __________  : R C L A Only I B Only II C Only III D I, II and III Answer : A Explanation :
17.
 In series LCR circuit, at resonance  __________ A Current is maximum, power factor is zero B Current is maximum, power factor is unity C Current is minimum, power factor is unity D None of these Answer : B Explanation :
18.
 The superposition theorem  is applicable to   _____________ A Current only B Voltage C Both current and voltage D Current, voltage and power Answer : C Explanation :
19.
 Which is the most suitable thermocouple transducer for the measurement of temperature in the range of 13000 C to 15000 C A Chromel – Alumel B Platinum – Rhodium C Iron – Constantan D Chromel – Constantan Answer : B Explanation :
20.
 Consider the following statement : A Linear Variable Differential Transformer (LVDT) has One primary winding Two exactly similar secondary windings A toroidal magnetic core of these statements which  is/are  correct A II & III B I & II C I & III D I, II & III Answer : B Explanation :
21.
 Match List – 1 (transducer) with List – 2 (input/output variables) and select the correct answer using the codes given below the list              List – 1                                              List – 2 P   Electrodynamic generator        1  Gas pressure to resistance change Q   Venture meter                              2  Force to displacement R   Pirani gauge                                  3  Motion to voltage   S    Spring balance                             4  Flow rate to pressure A P – 2; Q – 1; R – 4; S – 3 B P – 2; Q – 4; R – 1; S – 3 C P – 3; Q – 4; R – 1; S – 2 D P – 3; Q – 4; R – 2; S – 1 Answer : C Explanation :
22.
 Applications of precision diode are  half wave rectifier Peak detector Window detector A I, II & III B I & III C I & II D None of these Answer : C Explanation :
23.
 Watt-meters can be grouped under  ____________ A Moving iron instruments B Moving coil instruments C Electro dynamo meter instruments D None of these Answer : A Explanation :
24.
 If which of the following do the measurement find their application ? Automatic control of processes & operations Engineering experimental analysis Monitoring of processes & operations A I only B I and II C II and III D I, II and III Answer : D Explanation :
25.
 Multi-meters are provided with separate scale for low ac voltage to  __________ A Have high accuracy only B Improve readability of the scale only C Have high accuracy and improve read ability of the scale D None of these Answer : D Explanation :
26.
 A voltmeter with a broadband width has  ____________ A High noise level and High sensitivity B Low noise level and Low sensitivity C Low noise level and High sensitivity D High noise level and Low sensitivity Answer : D Explanation :
27.
 For what voltage levels are the screwed conduit circuits used A Less then  250 V B Between 250 V – 600 V C Above 600 V D None of these Answer : B Explanation :
28.
 What is an electrical schedule ? A list or a plan of a building providing information of number of point room. The list of all the electrical components required for a particular room. The list all the electrical components along with their prices A Only I B Only II C Both II and III D None of these Answer : A Explanation :
29.
 Which among these is a method of wiring ? Joint box Tee system Loop in system A Only I B Only II C Only III D I, II & III Answer : D Explanation :
30.
 Which among the following information is required for a good estimation ? Availability of products Source of production, vendor selection New products and their quality Prices and the discounts provided for each product A I & II B II, III & IV C I, II, III & IV D Only IV Answer : C Explanation :
31.
 Which material is used for wiring continuous bus bar Aluminium Copper A Only I B Only II C Both I and II D None of these Answer : A Explanation :
32.
 What is meant by contingencies  The list of required component are included in this category The list of vague and unforeseen item is included in this category The list of components along with their discounted prices is included in this category A Only I B Only II C Only III both II and III D Answer : B Explanation :
33.
 Which among the following mode of tendering is used by purchase department Open tendering Limited tender Spot tendering Global tendering Proprietary tendering A Only I, III and IV B Only I, II, III and V C Only I and IV D I, II, III, IV and V Answer : D Explanation :
34.
 What is the maximum load that can be connected in a circuit connecting only lighting points A 500 watts B 750 watts C 800 watts D 1000 watts Answer : C Explanation :
35.
 What is ment by petty purchase A An item purchase from market by purchase assistant with proper formal order B An item purchase from market by purchase assistant without proper formal order C A single tendering purchase D None of these Answer : B Explanation :
36.
 What is the maximum number of lighting points that can be connected in a circuit A 5 B 10 C 8 D 2 Answer : B Explanation :
37.
 In an intrinsic semiconductor  ________ A There are no holes in the material B Number of holes is equal to number of electrons C Electron in the material are more than holes D These are no electrons in the material Answer : B Explanation :
38.
 The minority of carrier concentration is largely a function of  _______ A The amount of doping B Temperature C Forward biasing voltage D Reverse biasing voltage Answer : B Explanation :
39.
 In the depletion region of a  PN  junction, there are  _________ A No charge B No mobile C No current D None of these Answer : B Explanation :
40.
 The donor atoms in an N-type semi-conductor at normal temperature   ___________ A Carry a positive charge B Carry a negative charge C Are neutral D None of these Answer : A Explanation :
41.
 In a synchronous motor  __________ A The rotor  MMF  and stator  MMF  are stationary with respect to each other B The speed of rotor  MMF  is slightly less than he speed of stator  MMF C The speed of rotor  MMF  is slightly more than speed of stator  MMF D None of these Answer : A Explanation :
42.
 The break test for the determination of efficiency of a  DC  machine is   _________ A An indirect method B A regenerative method C A direct method D None of these Answer : C Explanation :
43.
 Commutation conditions at full-load a large  DC  machine can be checked by  _________ A Brake test B Swinburne’s test C Hopkinson’s test D None of these Answer : C Explanation :
44.
 The load carried by  V – V  connection is  _________ A 47.7 % of the original B 57.7 % of the original C 67.7 % of the original D 87.7 % of the original Answer : B Explanation :
45.
 DC motors should be stopped by opening the line switches and not by forcing the starter handle back to the off position because  Heavy sparking occurs at the brushes. Heavy sparking occurs at the first stud of the starting resistance steps A Only I B Only II C Both I and II D None of these Answer : B Explanation :
46.
 In DC motor starters are used  _________ To increase the starting torque To limit the starting current A Only I B Only II C Both I and II D None of these Answer : B Explanation :
47.
 The voltage regulation of a transformer having copper loss  1%  of output and percentage reactance drop of  5%  and power factor  0.9 lagging is  __________ A 3.08% B 3% C – 3.08% D 3.8% Answer : A Explanation :
48.
 The full load slip of a  4-pole, 50Hz, phase induction motor rotating at  1410 rpm  is  __________ A 9% B 2% C 6% D 1% Answer : C Explanation :
49.
 A 4-pole, lap wound, DC generator has the following details : Flux = 0.07 web/pole,     speed = 900 rpm  Armature conductor  =  400 The generated  emf is  _________ A 400 V B 502 V C 462 V D 900 V Answer : C Explanation :
50.
 Condition for maximum power delivered in  DC generator  is  ________ A Back EMF = (Supply voltage / 2) B Back EMF  =  supply voltage/2 C Back EMF = (Supply voltage / 4) D Back EMF = (Supply voltage / 9) Answer : A Explanation :
51.
 The motor applied in blowers and fans is  ___________ A DC shunt motor B DC series motor C DC Differential compound motor D None of these Answer : A Explanation :
52.
 The Dc motor having the high starting Torque is  ___________ A Series motor B Shunt motor C Differential compound motor D None of these Answer : A Explanation :
53.
 Which of the following is an AC motor A Slip-ring motor B Synchronous motor C Squirrel cage motor D All options are correct Answer : D Explanation :
54.
 Which of the following information available on name plate of a motor A HP rating B R.P.M. C Fram model D All options are correct Answer : D Explanation :
55.
 Electronic sft starters are used for motors to  __________ . A Achieve variable speed B Provide smooth start and stop C Improve the loading D None of these Answer : B Explanation :
56.
 What is the unit of measure for electrical pressure or electromotive force A Amperes(A) B Ohm(Ω) C Volt(V) D Watt(W) Answer : C Explanation :
57.
 Which of the following circuit configurations has the same amount of voltage drop across each of its components A Parallel connection B Series parallel connection C Series connection D All options are correct Answer : A Explanation :
58.
 What is the term used to describe the ability of a device to store energy in the form of an electrical charge A Inductance B Conductance C Reactance D Capacitance Answer : D Explanation :
59.
 In mutual induction, what passes between conductors in order to create voltage A Radiation B Magnetic flux C Current flow D Resistance Answer : B Explanation :
60.
 Henry is the unit of measurement for which of the following properties A Reactance B Capacitance C Resistance D Induction Answer : D Explanation :
61.
 Which of the following is an appropriate a voltmeter A The measurement of difference of potential B The measurement of electric current flow C The determination of total resistance D The determination of power output Answer : A Explanation :
62.
 What should be observed when connecting a voltmeter into a  DC  circuit A RMS B Resistance C Polarity D Power factor Answer : C Explanation :
63.
 The speed of an  AC  motor depends on  ___________ A Frequency only B Number of poles only C Both Frequency and Number of pole D None of these Answer : C Explanation :
64.
 The basic shift register operation is  __________ A Serial in serial out B Serial in parallel out C Parallel in serial out D All options are correct Answer : D Explanation :
65.
 Two block  G1(s) and  G2(s) can cascaded to get resultant transfer function as  _________ A G1(s) + G2(s) B G1(s)/ G2(s) C G1(s). G2(s) D 1 + G1(s) + G2(s) Answer : A Explanation :
66.
 The standard 2 – input  TTL  gets for the below shown electrical symbol is  _________ Figure A 7400 B 7402 C 7410 D 7500 Answer : A Explanation :
67.
 Fermi energy level for p-type extrinsic semiconductors lies  _________ A At middle of the band gap B Close to conduction band C Close to valence band D None of these Answer : C Explanation :
68.
 __________  is the dominant form of distortion produced by the simple push-pull amplifier A Crossover distortion B Harmonic distortion C Clipping D Clamping Answer : A Explanation :
69.
 The average voltage at the output of FWR is  ___________ A $2V_{m}/\pi$ B $V_{m}/\pi$ C $V_{m}/\2$ D Only of these Answer : A Explanation :
70.
 Transistor can be used to  __________ A Amplify current B Amplify voltage C Amplify power D All options are correct Answer : D Explanation :
71.
 ____________  consists of two plates separated by a dielectric and can store charge A Relay B Capacitor C Inductor D Transistor Answer : B Explanation :
72.
 Consider a single crystal of an intrinsic semiconductor. The number of free carriers at the fermi level at room temperature is A Half the total number of electrons the crystal B Half the total number of free electrons the crystal C Half the total number of atoms in the crystal D Zero Answer : B Explanation :
73.
 A semiconductor is formed by  __________  bonds. A Metallic B Covalent C Ionic D None of these Answer : B Explanation :
74.
 $\beta$gain of the transistor signifies  _________ A Amplification capability of the transistor B Rectification  capability of the transistor C Regulation capability D All options are correct Answer : A Explanation :
75.
 High frequency and impulse currents are measured using  _________ A Resistive shunt B Inductive element C Hall and faraday effect device D All options are correct Answer : D Explanation :
76.
 The classical analogus of a simple level is  ____________ A Capacitor bridge B Transformer C Mutual inductor D None of these Answer : B Explanation :
77.
 Fleming’s Laft hand rule is used in  ____________ A Motor B Generator C Transformer D None of these Answer : A Explanation :
78.
 The normal value of the armature resistance of a DC motor is equal to A 0.005 B 0.05 C 10 D 100 Answer : B Explanation :
79.
 In a  DC generator commutator acts as a  __________ A Inverter B Rectifier C Collector D Short circuit Answer : B Explanation :
80.
 In a 3-phase alternation is short circuited at it terminal, then the initial value of short circuit current will then be limited by  ________ A Synchronous reactance B Transient reactance C Sub transient reactance D None of these Answer : C Explanation :
81.
 If the  AC  supply to transformer is replaced to DC  _________ A The primary winding will burn B The secondary winding will burn C The transformer has no effect D All options are correct Answer : A Explanation :
82.
 The principal of operation of a  3-phase induction motor is most similar to that of a  ___________ A Synchronous motor B Repulsion-start induction motor C Transformer with a shorted secondary D Capacitor-start induction-run motor Answer : C Explanation :
83.
 Alternators are classified into  ___________ A Salient pole  &  non-salient pole B Slip-ring & squirrel cage C Self-starting & separately starting D None of these Answer : A Explanation :
84.
 According to  Lenz’s law, the induced  emf  acts up a current in which direction A Some direction of cause producing it B Direction of gravity C Direction opposite of cause producing it D None of these Answer : C Explanation :
85.
 According to Fleming’s right hand rule the thumb shows  __________ A Direction of current B Direction of flux C Direction of motion D Direction of gravity Answer : C Explanation :
86.
 In a pure capacitive circuit  ___________ A The current leads applied voltage by 9C degree B The current is in phase with applied voltage C The current lage applied voltage by  90 degree D None of these Answer : A Explanation :