Electrical Basic Questions 11

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Attempt Free Electrical Basic Questions 11 Here. Read The Important Electrical Basic Questions 11 MCQ From Below.

Question 1 : The main advantages of a.c. is ??.

A. A.C. motors are expensive
B. The A.C. voltage can’t be raised or lowered
C. A.C. transmission is very costly
D. None

Correct Answer is Option D : None

Question 2 : The main advantage of purely sinusoidal waveform is??.

A. it is only alteranating waveform
B. it is the only standard waveform.
C. any other waveform can be resolved into series of sinusoidal waveforms of different frequency
D. it produces distorted waveforms when applied.

Correct Answer is Option C : any other waveform can be resolved into series of sinusoidal waveforms of different frequency

Question 3 : The waveforms in which magnitude changes but its direction remain same is called ?

A. pulsating d.c.
B. alternating
C. pure d.c.
D. None

Correct Answer is Option A : pulsating d.c.

Question 4: ??. Is the advantage of a.c.

A. the voltage can be raised or lowered
B. A.C. transmission is economical and efficient.
C. A.C.can easily converted to D.C.
D . All of the above.

Correct Answer is Option D : All of the above.

Question 5 : The generation of the a.c. is according to ??.

A. Faradays law
B. Thevenins theorem
C. Ohms law
D. Kirchhoffs law

Correct Answer is Option A : Faradays law

Electrical Basic Questions 11

Question 6 : ??..represents maximum value of alternating emf

A. B I l
B. B v l
C. B I v
D. l I v

Correct Answer is Option A : B I l

Question 7 : Standard alternating emf is represented as??.

A. Em tan_
B. Em cos_
C. Em sin_
D. None

Correct Answer is Option C : Em sin_

Question 8 : Standard alternating emf achieves its positive maximum value at _=??.

A. 45
B. 90
C. 180
D. 270

Correct Answer is Option B : 90

Question 9 : The time taken by an alternating quantity to complete one cycle is called??.

A. Frequency
B. Speed
C. Waveform
D. Time period

Correct Answer is Option D : Time period

Question 10 : The unit of frequency is ____

A. Rad/sec
B. Sec
C. Hz
D. Volts

Correct Answer is Option C : Hz

Electrical Basic Questions 11

Question 11 : The relation between f and w is????

A. f=1/w
B. w=2?/f
C. w=2?f
D. w=1/f

Correct Answer is Option C : w=2?f

Question 12 : The time period of sinusoidal waveform with 200Hz frequency is??..

A. 0.005s
B. 0.0005s
C. 0.5s
D. None

Correct Answer is Option C : 0.5s

Question 13 : The value of a alternating quantity of a particular instant is called??..value.

A. Instantaneous
B. Peak
C. Peak to peak
D. Average

Correct Answer is Option A : Instantaneous

Question 14 : The waveform which shows repetation of variations after a regular time interval is called???

A. Nonperiodic waveform
B. Sawtooth waveform
C. Periodic waveform
D. Triangular waveform

Correct Answer is Option C : Periodic waveform

Electrical Basic Questions 11

Question 15 : In our nation, the standard frequency of alternating voltage is????.

A. 60 cycle/sec
B. 50 cycle/sec
C. 100 cycle/sec
D. None

Correct Answer is Option B : 50 cycle/sec

Question 16 : The higher value attained by an alternating quantity during positive or negative half cycle is called???..

A. Maximum
B. Amplitude
C. Peak
D. All

Correct Answer is Option B : Amplitude

Question 17 : For 50Hz alternating waveform the angular frequency is?????.rad/sec

A. 314.16
B. 50
C. 0.126
D. None

Correct Answer is Option A : 314.16

Question 18 An a.c voltage is given by v=40 sin 314t. The frequency is?????..

A. 75Hz
B. 50Hz
C. 25Hz
D. 100Hz

Correct Answer is Option B : 50Hz

Question 19 : An alternating voltage is given by v =100 sin (3.14 t-300) volts. The frequency is ????

A. 25Hz
B. 50Hz
C. 60Hz
D. 100Hz

Correct Answer is Option B : 50Hz

Question 20 : An A.C. voltage is given by 100 sin 314 t. the frequency is????

A. 50Hz
B. 75Hz
C. 25Hz
D. 100Hz

Correct Answer is Option B : 75Hz

Electrical Basic Questions 11

Question 21 : The equation of an alternating quantity is v = 282.84 sin 100 ? t then its r.m.s value is???..

A. 200
B. 20
C. 141.421
D. 400

Correct Answer is Option A : 200

Question 22 : The voltage of domestic a.c. supply is 230V. This value represent???.

A. Peak value
B. r.m.s. value
C. Average value
D. Mean value

Correct Answer is Option B : r.m.s. value

Question 23 : The voltmeter in a.c. circuit always measures????.values.

A. Average
B. Maximum
C. r.m.s.
D. None

Correct Answer is Option A : Average

Question 24 : The r.m.s value of an alternating current is 10A then its peak to peak value is ____

A. 10A
B. 30A
C. 5A
D. 20A

Correct Answer is Option C : 5A

Electrical Basic Questions 11

Question 25 : A sinusoidal voltage is represented as 141.42 sin 314 _t then its r.m.s value of the voltage and frequency are respectively????

A. 141.42V, 314Hz
B. 100V, 50Hz
C. 100V, 60Hz
D. 200V, 100Hz

Correct Answer is Option B : 100V, 50Hz

Question 26 : The peak value of an alternating current is Im then its average value is????.

A. 0.637 Im
B. 4.12 Im
C. 1.44 Im
D. None

Correct Answer is Option A : 0.637 Im

Question 27 : The average value of sinusoidal varying voltage is ?.. than its rms value.

A. more
B. less
C. same as
D. None

Correct Answer is Option A : more

Question 28 : The form factor of purely sinusoidal waveform is ?..

A. 1.11
B. 1.21
C. 1.414
D. None

Correct Answer is Option A : 1.11

Question 29: The peak factor of a sinusoidally varying voltage is ??..

A. 1.414
B. 1.11
C. 0.866
D. 0.707

Correct Answer is Option B : 1.11

Electrical Basic Questions 11

Question 30 : Alternating quantities are represented by

A. Vectors
B. Scalars
C. Phasors
D. Graphs

Correct Answer is Option C : Phasors

Question 31 : Phasors always rotate in________ direction

A. Clockwise
B. Anticlockwise
C. Vertical
D. Horizontal

Correct Answer is Option B : Anticlockwise

Question 32 _________ projection of a phasor reprents an instantaneous value of an alternating quantity

A. Y-axis
B. X-axis
C. Z-axis
D. None

Correct Answer is Option B : X-axis

Question 33 : The phase of an alternating quantity varies from

A. 0-90
B. 0-180
C. 0-360
D. 180-360

Correct Answer is Option C : 0-360

Electrical Basic Questions 11

Question 34 When two alternating quantities are in phase then their phase difference is________

A. 30
B. 90
C. 0
D. 60

Correct Answer is Option C : 0

Question 35 : The negative maximum of a cosine wave occurs at ???.

A. 45
B. 90
C. 180
D. 270

Correct Answer is Option C : 180

Question 36 ?????.. representation gives rms value of an alternating quantity

A. Phasor
B. Polar
C. Rectangular
D. None

Correct Answer is Option A : Phasor

Question 37 : The polar form of -3+j4 is???..

A. 5<-53.13
B. 5<53.13
C. 5<-126.86
D. 5<126.86

Correct Answer is Option D : 5<126.86

Question 38: The rectangular form of the 5<30 is ???..

A. 4.33+j2.5
B. 4.33-j2.5
C. Can’t say
D. None

Correct Answer is Option A : 4.33+j2.5

Electrical Basic Questions 11

Question 39 : For a 50Hz transformer, the primary turns are 100 and maximum flux in the core is 0.08Wb then primary side induced emf is?????..

A. 1856V
B. 1276V
C. 1776V
D. 7776V

Correct Answer is Option C : 1776V

Question 40 : RMS value of the induced emf per turn in transformer is ????

A. 4f_m
B. 4.44f_m
C. 2f_m
D. f_m

Correct Answer is Option B : 4.44f_m

Question 41 : For transformer the induced emf on primary is 199.8 V with 50 turns at 50 Hz frequency than the maximum flux in the core is???..
A. 79.92mWb
B. 18mWb
C. 18Wb
D. 0.999Wb

Correct Answer is Option B : 18mWb

Question 42 : An ideal transformer is the one having?????..
A. No losses
B. Zero resistance winding
C. Zero leakage flux
D. All

Correct Answer is Option D : All

Question 43 : For a 10 KVA 2000/200V transformer the half load secondary current is ??..

A. 50A
B. 5A
C. 25A
D. 2.5A

Correct Answer is Option C : 25A

Electrical Basic Questions 11

Question 44 If any ammeter in the secondary of a 100/10 V ratio reads 10 A ,The current the primary would be ??..

A. 1A
B. 2A
C. 10A
D. 100A

Correct Answer is Option A : 1A

Question 45 : transformer rating is expressed in VA because???..

A. on both side it is constant
B. Losses are independent of load power factor
C. The frequency is constant
D. None

Correct Answer is Option B : Losses are independent of load power factor

Question 46 : For 440 V /100V transformer the secondary turns are 16 than the primary turnsare ?????..

A. 4
B. 64
C. 26
D. 8

Correct Answer is Option A : 4

Question 47 : A transformer having turns ratio is 1:1 is called ???transformer

A. Isolation
B. Step up
C. Step down
D. None

Correct Answer is Option A : Isolation

Electrical Basic Questions 11

Question 48 : A transformer has secondary full load current of 10A and secondary no load induced emf of 200v then it is KVA rating is???..

A. 2000
B. 200
C. 2
D. 20

Correct Answer is Option C : 2

Question #49 A high voltage side is ???..

A. Low current, low impedance side
B. High current, low impedence side
C. Low current, high impedance side
D. None

Correct Answer is Option C : Low current, high impedance side

Question 50 : A low voltage side is ???..

A. Low current, low impedance side
B. High current, low impedence side
C. Low current, high impedance side
D. None

Correct Answer is Option B : High current, low impedence side

Question 51 : Regulation of transformer is defined as ?..

A. rise in terminal voltage when loaded
B. fall in terminal voltage when loaded
C. change in secondary terminal volatage from no load to full load as a percentage of secondary no load terminal voltage
D. None

Correct Answer is Option C : change in secondary terminal volatage from no load to full load as a percentage of secondary no load terminal voltage

Electrical Basic Questions 11

Question 52 : For the leading power factor loads ,the regulation of transformer is?.

A. Positive
B. Negative
C. Zero
D. Unity

Correct Answer is Option B : Negative

Question 53 For better performance of the transformer ,the regulation of the transformer must be?.

A. High
B. Infinite
C. Very low
D. None

Correct Answer is Option C : Very low

Question 54 the voltage regulation of the transformer is zero for ??.load

A. Lagging
B. Resistive
C. Inductive
D. Capacitive

Correct Answer is Option B : Resistive

Question 55 If the transformer regulation is positive, ?..load is connected to the transformer