Electrical Engineering Test 1

Total Questions: 100

1 - The pole shoes of DC machines are fastened to the pole core by

A ) Welding
B ) Countersunk screws ✅
C ) Steel clumps
D ) Soldering

2 - Which of the following are considered as disadvantage(s) of Gauss-Seidel method over Newton's method in load flow programs?

A ) More memory requirement and less accuracy
B ) Less interactions but more memory
C ) More iteration ✅
D ) More accuracy and more memory

3 - The quantity "Rm" which relates dependent voltage to controlling current is called

A ) Appearance of the transmission line
B ) Decrease system stability
C ) Mechanical stability of line
D ) Increase the short circuit current ✅

4 - Landfill gas is actually ____ used in thermal power plants.

A ) Ethane
B ) Methane ✅
C ) Black liquor
D ) Nitrogen

6 - Radio frequency chocks are air cored to

A ) Keep frequency low
B ) Keep frequency high
C ) Keep inductive reactance low ✅
D ) Keep inductive reactance high

7 - For which purpose bundled conductors are employed to a power system

A ) Increase the short circuit current ✅
B ) Decrease system stability
C ) Mechanical stability of line
D ) Appearance of the transmission line

9 - If field resistance of a dc shunt generator is increased beyond its critical value, the generator.

A ) may burn out if loaded to its name plate rating
B ) output voltage will exceed its name plate rating
C ) will not build up ✅
D ) power output may exceed its name plate rating

12 - If the input capacitor of a power supply is shorted; it will result In

A ) No voltage output ✅
B ) Low voltage output
C ) Reduced voltage output
D ) Excessive hum

13 - Admittance is the reciprocal of

A ) Capacitive reactance
B ) Impedance ✅
C ) Reactive power
D ) Inductive reactance

15 - Which of the following Ideas means deciding at runtime what strategy to summon?

A ) Dynamic loading
B ) Dynamic blinding ✅
C ) Dynamic hiding
D ) Dynamic typing

16 - If the firing angle in an SCR rectifier is decreased, output will be

A ) Decreased
B ) Maximum
C ) Unaffected
D ) Increased ✅

17 - The ____ time signal is described for all values of time.

A ) Discrete
B ) Continuous ✅
C ) Random
D ) Digital

20 - Discrete device field effect transistor is classified on the basis of the

A ) Resistive state
B ) Conducting state
C ) Voltaic state
D ) Control gate construction ✅

21 - At very sunny places this source(s) of energy can be found

A ) Jet fuel
B ) Geothermal
C ) Solar ✅
D ) Jet fuel & Solar

22 - Main purpose of modulation process is to

A ) Increase signal to noise ratio
B ) Time shift in frequency ✅
C ) Reduce the mutual interference
D ) Add extra noise to the signal

23 - Which line is obtained by the method of least square?

A ) Second degree equation line
B ) Straight line
C ) Best fit line ✅
D ) Polynomial equation line

24 - A transformer transforms

A ) Voltage
B ) Current
C ) Power
D ) Voltage & Current ✅

25 - Conjugation x /\ y behaves on binary digits as ____ in ordinary algebra

A ) Division
B ) Addition
C ) Subtraction
D ) Multiplication ✅

26 - Power in an AC circuit is found by

A ) VI sinα
B ) VI tanα
C ) VI cosα ✅
D ) VI

27 - Modulation index in amplitude modulation

A ) Is defined as the measure or extent of amplitude variation about an un-modulated carrier. ✅
B ) Does not impact power
C ) Is independent of integral multiple of amplitude
D ) Is steady state

29 - SCR (Silicon controlled rectifier) goes into saturation, when gate-cathode junction is

A ) Forward biased ✅
B ) Reverse biased
C ) In steady state
D ) Polarized

30 - Drop out to cut off ratio for most relays is of the order of

A ) 0.2 to 0.3
B ) 0.3 to 0.4
C ) 0.4 to 0.6
D ) 0.6 to 1.0 ✅

32 - DC generators have ____ on rotating shafts that convert AC into DC.

A ) Diodes
B ) Commutator ✅
C ) Compressor
D ) Rotor

33 - There are two types of overload protection; instantaneous over current and

A ) Variable over current
B ) Time over current ✅
C ) Constant over current
D ) Delay feedback current

34 - Single sideband techniques are mostly employed for

A ) Conservation of transmitted power
B ) Improving the performance of frequency modulation
C ) Conservation of transmitted power and bandwidth ✅
D ) Conservation of transmitted bandwidth

35 - For the same peak value of voltage which waveform will have the least RMS value?

A ) Sine wave
B ) Square wave
C ) Triangular wave ✅
D ) Full wave rectified sine wave

39 - The partial derivatives "fxy" and "fyx" are called ____ derivatives.

A ) Dependent partial
B ) Independent partial
C ) Mixed partial ✅
D ) Universal partial

40 - Green function method is a useful technique for solving.

A ) Ordinary differential equation
B ) Partial differential equation ✅
C ) 1st order ODEs
D ) 2nd order ODEs

41 - The sum of all potential differences in a complete loop through the circuit should be

A ) Equal to zero ✅
B ) Equal to individual voltages
C ) Equal to Individual currents
D ) Equal to individual resistances

42 - Unguided propagation involves

A ) Propagation through computer LANs
B ) Propagation through coaxial cable
C ) Propagation through optical fiber
D ) Free space propagation ✅

44 - Dynamic resistance of diode

A ) Remains constant with time
B ) Cannot be calculated for a diode
C ) Doesn't depend on voltage and current
D ) Changes as a function of applied voltage ✅

45 - The TRIAC Is a ____ device with control terminal

A ) Uni-directional
B ) Bi-directional ✅
C ) Tri-directional
D ) Two terminals

47 - In open loop control system, input is ____ output.

A ) Dependent of
B ) Independent of ✅
C ) Equal to
D ) Exponent of

49 - Error in a computer program is called

A ) Virus
B ) Crash
C ) Bug ✅
D ) Warm

50 - A system is ____ if the natural response neither decays nor grows, but remains constant or oscillates.

A ) Asymptomatically stable
B ) Marginally stable ✅
C ) Fully stable
D ) Absolute stable

51 - N-type material Is formed by doping pure silicon with

A ) Trivalent Impurity
B ) Tetravalent impurity
C ) Pentavalent impurity ✅
D ) Divalent impurity

52 - The main criterion for selection of the size of power distribution using a radial distribution system is

A ) Voltage drops ✅
B ) Corona loss
C ) Capital cost
D ) Temperature rise

53 - Self-induction of a solenoid is

A ) Directly proportional to the current flowing through the coil.
B ) Inversely proportional to its area of cross-section
C ) Directly proportional to its length
D ) Directly proportional to its area of cross-section ✅

54 - Transmission lines mostly use high voltage ____ alternating current.

A ) Single phase
B ) Two phases
C ) Three phases ✅
D ) Neutral Phase

55 - In a DC generator, brushes on the commutator are shifted from geometrical neutral position to

A ) Obtain highest generator voltage
B ) Avoid sparking ✅
C ) Obtain highest generator efficiency
D ) Produce spark

56 - The electric dipole moment per unit volume of the dielectric is called

A ) Dipole density
B ) Polarization of dielectric ✅
C ) Electric displacement vector
D ) Polarization density

57 - The negative maximum of cosine wave occurs at

A ) 0°
B ) 270°
C ) 180° ✅
D ) 90°

58 - For current amplification in BJT, we mostly use

A ) Common base configuration
B ) Common emitter configuration
C ) Common collector configuration ✅
D ) common base and common emitter configuration

59 - Let Vab, then ____ is taken as reference.

A ) Node A ✅
B ) Node B
C ) Origin point
D ) Node A and Node B

60 - Stepper motor is a/an ____ motor which divides full rotation into large number of steps.

A ) Direct current ✅
B ) Alternating current
C ) Powerless
D ) Small

61 - A state during which nothing happens is known as

A ) LOA
B ) Nop ✅
C ) MAR
D ) Op Code

62 - A relay used for protection of motors against overload is

A ) Impedance relay
B ) Electromagnetic attraction type
C ) Thermal relay ✅
D ) Buchholz's relay

63 - Which of the following relays is used on transformers?

A ) MHO Relay
B ) Merz Price Relay
C ) Buchholz's relay ✅
D ) None

64 - Solid Grounding is used for Voltages

A ) Above 220 kV
B ) Above 11 kV
C ) Below 660V ✅
D ) Below 115 kV

65 - An ideal voltage source has ____ internal resistance

A ) Zero ✅
B ) Infinity
C ) High
D ) Low

66 - A moving iron ammeter coil has few turns of thick wire in order to have

A ) Low resistance ✅
B ) High sensitivity
C ) Effective damping
D ) Large scale

67 - Electric lines of force about a negative charge are

A ) Circular and anticlockwise
B ) Circular and clockwise
C ) Radially Inward ✅
D ) Radially outward

68 - A digital signal is

A ) Discrete
B ) Discrete in time
C ) Discrete in amplitude
D ) Discrete in amplitude and time ✅

69 - ____ is defined as the measure of instrument by which it Is error free.

A ) Accuracy ✅
B ) Precision
C ) Resolution
D ) Correction

70 - A diode that has a negative resistance characteristic is the

A ) Schott key diode
B ) Tunnel diode ✅
C ) Hot carrier diode
D ) Laser diode

71 - Which type of engine uses maximum air fuel ratio?

A ) Petrol engine
B ) Gas engine
C ) Diesel engine
D ) Hydro turbine ✅

72 - Which Instrument has same calibration for AC & DC values?

A ) Induction type
B ) Hot wire type ✅
C ) Moving coil type
D ) Moving iron type

73 - The EM field and current are concentrated close to the surface of conductor. The phenomenon is called

A ) Skin effect ✅
B ) Faraday effect
C ) EM concentration effect
D ) Ohm’s effect

74 - Light is produced in electric discharge lamps by

A ) Ionization in vapor or gas ✅
B ) Heating effect
C ) Magnetic effect
D ) Carbon electrodes

75 - ____ diode acts as a voltage controlled variable capacitor.

A ) Light emitting
B ) Avalanche
C ) Zener
D ) Varactor ✅

76 - By which a meter after checking with no current returns to its previous state

A ) Damping torque
B ) Controlling torque ✅
C ) Deflecting torque
D ) Controlling & Deflecting torque

77 - By connecting a shunt of higher value in ammeter what will happen

A ) Current sensitivity increases
B ) Current sensitivity decreases ✅
C ) Damping increases
D ) Controlling torque decreases

78 - Current chopping occurs in ____.

A ) Air blast circuit breaker ✅
B ) Vacuum filled
C ) Oil filled
D ) SF6

80 - In Z- Transform, the ROC must be centered at

A ) Origin ✅
B ) Z = i
C ) Poles
D ) zeros

82 - A rectifier is a ____.

A ) Bilateral device
B ) Linear device
C ) Nonlinear device
D ) Passive device

83 - Electric energy is stored by

A ) Nickel cadmium battery
B ) Lead acid battery ✅
C ) Dry cell battery
D ) None

84 - What is handoff?

A ) Call activation
B ) Call termination
C ) Shifting call from one cell to another ✅
D ) Call activation & Call termination

85 - When electric field is parallel to the plane of incident, electromagnetic wave is said to be

A ) linearly polarized
B ) Elliptically polarized
C ) Circularly polarized
D ) Hyperbolically polarized /Parallel polarized ✅

86 - Moving coil ammeter can measure

A ) AC current
B ) DC current ✅
C ) Stray current
D ) Eddy current

87 - Due to velocity saturation, MOSFET enters in saturation region

A ) Before pinch off ✅
B ) At pinch off
C ) At Q point
D ) After pinch off

88 - Which of the following is not bilateral?

A ) Resistor
B ) Diode
C ) Capacitor
D ) Inductor

90 - In a rotary converter

A ) Armature currents are DC only
B ) Armature currents are AC only
C ) Partly AC & partly DC ✅
D ) Extra high voltage

91 - Which bulb operates on lowest power?

A ) Night Bulb
B ) Neon Bulb
C ) GLS Bulb
D ) Torch lamp ✅

92 - Which Instrument cannot be used for DC measurements?

A ) Moving iron attraction type
B ) Moving coil permanent magnet type
C ) Hot wire type
D ) Induction type ✅

93 - Which type of system is referred by pneumatic system?

A ) Pressure ✅
B ) Hydraulic
C ) Fluid
D ) Dynamic

94 - The voltage above 230kV is called

A ) Extra high voltage ✅
B ) Ultra-high voltage
C ) High voltage
D ) Low voltage

95 - Lower voltages like 66kv and 33kv are considered to be

A ) Sub transmission voltage ✅
B ) Distribution voltage
C ) Generation voltage
D ) Mix voltage

97 - DIAC is a semi-conductor device which act as a

A ) 2 terminal unidirectional switch
B ) 2 terminal bidirectional switch ✅
C ) 3 terminal bidirectional switch
D ) 4 terminal multi-directional switch

98 - What is reciprocal of power factor?

A ) Gain
B ) Q factor ✅
C ) Reactive power
D ) Real power