Electrical Engineering Test 2

Total Questions: 100

1 - Aero derivative turbines do not have

A ) Stator
B ) Compressor
C ) Fuel Intake system
D ) Fan ✅

3 - In superposition theorem, all voltage Sources are replaced by

A ) Open circuit
B ) Closed circuit
C ) Short Circuit ✅
D ) Open circuit with parallel branch

4 - The principle of ____ can be used to analyze fault in power system network

A ) Thevenin
B ) Norton
C ) Jordon
D ) Superposition ✅

5 - In submarine power system, power Is transmitted through ____ cables

A ) High voltage direct current ✅
B ) Low voltage direct current
C ) Under current
D ) Under ampere

6 - RC snubber circuit is used to limit the rate of ____ In off state

A ) Rise of current in SCR
B ) Rise of voltage in SCR ✅
C ) Conduction period
D ) All

7 - Which system Is used for dc-to-dc high voltage gain?

A ) Solar cell energy conversion system
B ) Battery backup system
C ) Fuel cell energy conversion system
D ) All of above ✅

8 - UJT has same characteristics like

A ) CE
B ) BJT
C ) FET ✅
D ) Diodes

9 - Rechargeable batteries or Pbs batteries are of ____ type

A ) Primary batteries
B ) Secondary batteries ✅
C ) Electrochemical batteries
D ) None

10 - Superposition theorem is applicable to

A ) linear system ✅
B ) Linear time variant
C ) Linear and non-linear
D ) Linear time invariant

11 - Four wires are available in ____ system

A ) Delta
B ) Star ✅
C ) Both A and B
D ) Interconnected

12 - Active devices are?

A ) Supply energy
B ) Absorb energy
C ) Convert energy from one form to another
D ) Supply energy and convert one form to another ✅

13 - Over Current protection for motors provided by

A ) Kit kat fuses
B ) Overcurrent Relay ✅
C ) Cartage fuses
D ) None

14 - Inductance can be measured by

A ) Wien's bridge
B ) Anderson bridge
C ) Shearing bridge
D ) Maxwell bridge ✅

15 - For a fixed number of poles and armature conductors ____ winding will give high emf

A ) Lap winding
B ) Wave winding ✅
C ) Copper winding
D ) A & B

16 - Maxwell loop current method of solving electrical network uses

A ) Branch currents
B ) Kirchhoff’s voltage law ✅
C ) Kirchhoff’s current law
D ) Is confined to single loop circuit

17 - Which of the following is not the type of transformer?

A ) Resonant transformer
B ) Ferrite core transformer
C ) Resonant transformer
D ) Cast Iron transformer ✅

18 - Which of the prime movers Is least efficient?

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

19 - When electromagnetic waves collide with hurdles their frequencies

A ) Increase
B ) Decrease
C ) Remains same ✅
D ) Bounce back

20 - In 3-phase 4-wire system, how many voltages. are available ?

A ) Two ✅
B ) Three
C ) Four
D ) All of above

21 - ____ meter is used a null detector In Wheatstone bridge?

A ) Ammeter
B ) Voltmeter
C ) Galvanometer ✅
D ) Wattmeter

23 - The wavelength of an electromagnetic wave after reflection at an angle on a surface

A ) Increases in the actual direction of propagation ✅
B ) Decreases In the actual direction of propagation
C ) Remains the same as the wavelength perpendicular to the surface
D ) Remains the same as in free space

24 - Δ x H=J + D is

A ) Maxwell equation ✅
B ) Continuity
C ) Laplace equation
D ) Poisson equation

25 - The channel of a JFET Is between the

A ) Gate and drain
B ) Drain and source ✅
C ) Gate and source
D ) Input arid output

26 - LTI system can be completely characterized by

A ) Impulse response ✅
B ) Step input
C ) Output
D ) Step response

27 - If a signal having different frequency and different sampling frequency are time division multiplexes then it is called

A ) Pulse stuffing ✅
B ) Synchronous multiplexing
C ) Asynchronous multiplexing
D ) FDMA

28 - We build control systems for

A ) Remote control
B ) Convenience of Input form
C ) Power amplification
D ) All of the above ✅

29 - Natural frequency of a system gives

A ) Nature of transient
B ) Overshoot
C ) Oscillation
D ) Speed of response ✅

30 - Hay bridge is used for the measurement of

A ) Inductance ✅
B ) Capacitance
C ) Resistance
D ) None of these

31 - ____ bridge is used for the measurement of resistance

A ) Shearing bridge
B ) Hay bridge
C ) Wheatstone bridge ✅
D ) Maxwell bridge

32 - In an LTI system, if all the poles and zeros are inside the unit circle then

A ) Its inverse does not exist
B ) The system is causal and stable
C ) The Inverse of system ls causal and stable
D ) Both system and its inverse are causal and stable ✅

33 - Under-damped systems have

A ) Damping ratio > 1
B ) 0 < damping ratio < 1 ✅
C ) Damping ratio = 1
D ) Damping ratio = 0

34 - An alternator is operating on unity PF load, then

A ) Armature reaction will be cross magnetizing ✅
B ) Armature reaction will be de-magnetizing
C ) Armature reaction will be magnetizing
D ) None of the above

35 - ROC converges if poles and Zeroes lies inside

A ) Origin
B ) Z=l ✅
C ) Poles
D ) Zeros

36 - ____ is the fastest possible response without the overshoot

A ) Under damped
B ) Over damped
C ) Critically damped ✅
D ) General response

37 - Which oscillator is the most stable oscillator?

A ) Crystal ✅
B ) Wien bridge
C ) Colpitts
D ) Hartley

39 - Any constant of time domain is an impulse in frequency domain with

A ) Infinite height, infinite width, infinite area
B ) Infinite height, infinite width, zero area
C ) Infinite height, zero width, zero area
D ) Infinite height, zero width, unit area ✅

40 - Which statement is true about continuous and discrete LTI system?

A ) Convolution sum Is approximation to convolution integral
B ) Convolution integral ls approximation to convolution sum
C ) Convolution sum and integral are explicit realization ✅
D ) All

41 - Which of the following has super linear rate of convergence?

A ) Bisection method
B ) Newton Raphson method
C ) Secant method ✅
D ) False position method

42 - The modulation technique in which carrier is switched between two different carrier levels 0 &1 is called

A ) Amplitude shift keying
B ) On off keying ✅
C ) Frequency shift keying
D ) Phase shift keying

43 - LTI system is stable when

A ) Zero ls Inside a unit circle
B ) Poles are Inside a unit circle ✅
C ) Zero at origin
D ) Poles at origin

44 - Which of the following converts thermal energy to kinetic energy?

A ) Thermocouple
B ) Fuel cell
C ) Rocket ✅
D ) Storage battery

45 - For constant voltage transmission, voltage drop is compensated by installing

A ) Synchronous motors ✅
B ) Inductors
C ) Capacitors
D ) All of above

47 - Boosters are basically

A ) Inductors
B ) Capacitors
C ) Transformers ✅
D ) Synchronous motors

48 - Difference between D-MOSFET and JFET is the absence of

A ) P-N Junction ✅
B ) Drain
C ) Gate
D ) Source

49 - FET is beneficial due to

A ) Low noise
B ) Small size
C ) High power gain
D ) All ✅

51 - FIR filter can be designed to achieve

A ) Linear phase ✅
B ) Inverting phase
C ) Non-inverting phase
D ) Both A & B

52 - In 8051 the contents of the Instruction register are split Into

A ) 2 nibbles ✅
B ) 3 nibbles
C ) 4 nibbles
D ) 5 nibbles

53 - One of the properties of FIR filters Is that Is not required for FIR filters

A ) Input
B ) Output
C ) Feedback ✅
D ) Transfer function

55 - The parameter hfe of a transistor corresponds to

A ) Beta dc
B ) Beta ac ✅
C ) Re'
D ) Rc'

56 - Oscillator whose frequency can be changed by a DC control voltage is

A ) Triangular wave oscillator
B ) Wien-bridge oscillator
C ) Crystal oscillator
D ) Voltage controlled oscillator ✅

58 - In RLC circuits, at low frequency, Z is larger due to

A ) XC is larger ✅
B ) XL is larger
C ) XC is smaller
D ) None

60 - In 8085 ____ ls the part of a control unit

A ) ROM
B ) RAM
C ) Instruction registers ✅
D ) OP code

61 - JFET has main drawback of

A ) Having low input impedance
B ) Noise distortion
C ) Having small gain-bandwidth product ✅
D ) None

62 - In order to have a lower cost of electrical energy generation

A ) The load factor and diversity factor should be low
B ) The load factor and diversity factor should be high ✅
C ) The load factor should be low and diversity factor should be high
D ) The load factor should be high and diversity factor should be low

64 - What is common mode rejection ratio CMRR?

A ) It Is ratio of differential mode gain to common mode gain ✅
B ) It Is the ratio of common mode gain to differential mode gain
C ) It is the product of common mode pin and differential mode gain
D ) None of these

65 - Resolution of ADC is defined as the no of bits In

A ) Output ✅
B ) Input
C ) I/O
D ) None

66 - The most common method for measurement of low resistance is

A ) Wheatstone bridge method
B ) Potentiometer method
C ) Kelvin bridge method ✅
D ) A & C

69 - If ROC (Region of convergence) does not include unit circle then

A ) Fourier transforme converges
B ) Z-transforme converges ✅
C ) Harley transforme converges
D ) Chirplet transforme converges

72 - TTL (Transistor Transistor Logic) of chip Integration uses

A ) Bipolar Junction transistor ✅
B ) Field effect
C ) Complementary symmetry metal oxide
D ) None

73 - For getting the sampled signal without any distortion, Nyquist criteria, the minimum sampling period must be according to

A ) Double the max period
B ) Equal to the max period
C ) Greater than the max period
D ) Half the max period ✅

74 - How is thyristor turned off?

A ) By forced commutation ✅
B ) Forward biasing
C ) Reverse gating
D ) None

75 - For a silicon diode. the value of the forward bias voltage is

A ) 0.1
B ) 0.3
C ) 0.7 ✅
D ) Depends on the concentration of majority carriers

76 - In high frequency applications we use

A ) Pulse transformer
B ) Air core transformers ✅
C ) Ferrite core transformers
D ) None

77 - If there are less than 4 electrons in the valence shell, then the element is generally, a

A ) Conductor ✅
B ) Insulator
C ) Semiconductor
D ) none of these ✅

78 - Which is not a type of substation?

A ) Line ✅
B ) Collector
C ) Converter
D ) Switching

79 - What is the basic principle behind motor operation?

A ) Electromagnetism ✅
B ) Electrostatic induction
C ) Magnetism
D ) None

85 - Hollow conductors are use in transmission line to

A ) To reduce corona ✅
B ) To reduce weight of the copper
C ) Improve stability
D ) Increase power transmission capacity

86 - Shunt reactors are connected with transmission lines for

A ) Limiting fault current
B ) Limiting fault voltage
C ) Absorbing reactive power ✅
D ) Absorbing High voltage surges

88 - Which of the following motor has the highest torque?

A ) DC series motor ✅
B ) AC series motor
C ) Induction motor
D ) Synchronous motor

89 - Motor that should not be used with load removed is

A ) Series motor ✅
B ) Shunt motor
C ) C Both
D ) None

90 - The process of conversion of AC into DC is called

A ) Magnification
B ) Amplification
C ) Purification
D ) Rectification ✅

92 - When no signal input, a bipolar transistor would have least Ic where

A ) Emitter base junction is reverse biased ✅
B ) Emitter grounded
C ) Emitter base Junction forward biased
D ) Emitter base current high

93 - An N-type and P-type semiconductor can be obtained by doping silicon with

A ) Sodium and magnesium respectively
B ) Indium and sodium respectively
C ) Phosphorus and boron respectively ✅
D ) Boron and arsenic respectively

94 - The form factor in reference to alternating current waveform represents the ratio of

A ) The average value to RMS value
B ) The peak value to RMS value
C ) The RMS value to average value ✅
D ) The RMS value to peak value

95 - Power factor of magnetizing component of a transformer is

A ) Zero ✅
B ) Unity
C ) 0.8 lagging
D ) Always leading

97 - The ____ field lasts as long' as current is flowing through the conductor

A ) Gravitational
B ) Electric
C ) Magnetic ✅
D ) Kinetic

98 - Waves which do not require material medium for their propagation are called

A ) Electromagnetic ✅
B ) Electrostatic
C ) Electrical
D ) Mechanical

99 - SCR Is a device having ____ layers and ____ Junctions

A ) Four, three ✅
B ) Three, four
C ) Three, two
D ) Four, two

100 - The AC motors used in servo applications Is a

A ) Single phase Induction motor
B ) Two phase Induction motor ✅
C ) Three phase induction motor
D ) Synchronous motor