| 1 |
Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean: |
Peak value
RMS value
Instantaneous value
Peak-to-peak value
Both (A) and (C0
|
| 2 |
The length of rotating vector (on a certain scale) represents the: |
Peak value of alternating quantity
RMS value of alternating quantity
Instantaneous value of alternating quantity
Either (B) or (C)
Either (A) or (B)
|
| 3 |
A sinusoidally alternating voltage or current can be graphically represented by a: |
Vector
Rotating vector
Clockwise vector
Anticlockwise voltage vector
None of these
|
| 4 |
If 250V is the RMS value of alternative voltage, then its peak value Vowill be: |
353.5V
250V
175V
zero
400V
|
| 5 |
If we connect a A.C. volt meter to read A.C. voltage, It would read its: |
RMS value
Instantaneous value
Valued average over a cycle
Zero
Both (B) and (C)
|
| 6 |
The phase at the positive peak of an A.C. cycle is: |
0<span style="font-family: "Times New Roman", serif; font-size: 12pt; text-align: justify;">º</span><p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;
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line-height:107%;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
90<span style="font-family: "Times New Roman", serif; font-size: 12pt; text-align: justify;">º</span><p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;
line-height:107%;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
180<span style="font-family: "Times New Roman", serif; font-size: 12pt; text-align: justify;">º</span><p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;
line-height:107%;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
0 and<span style="font-size:12.0pt;line-height:107%;
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mso-ansi-language:EN-US;mso-fareast-language:EN-US;mso-bidi-language:AR-SA">Ꮨ</span>
<span style="font-size:12.0pt;line-height:107%;
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mso-fareast-theme-font:minor-latin;mso-bidi-font-family:"Times New Roman";
mso-ansi-language:EN-US;mso-fareast-language:EN-US;mso-bidi-language:AR-SA">Ꮨ/2</span>
|
| 7 |
The alternative voltage of current is actually measured by: |
Its RMS value
Square root of its mean square value
Instantaneous value
Peak value
Both (A) and (B)
|
| 8 |
The magnitude of alternative voltage V: |
Always increase
Always decrease
Remains constant
Does not remain constant
None of these
|
| 9 |
If we connected the ordinary DC ammeter to measure alternating current, it would measure its: |
Instantaneous value
RMS value
Value averaged over a cycle
Either (B) or (C)
Either (A) or (C)
|
| 10 |
The RMS value of alternating current is: |
0.7 times at the peak value
0.5 times the peak value
0.7 times the Instantaneous value
Equal to maximum voltage
None of these
|
| 11 |
The Instantaneous value of alternative current maybe: |
The same as its RMS value
Greater than its Rms value
The same as its peak value
Any of these
None of these
|
| 12 |
Peak value of alternative current is:
|
one of its Instantaneous value
Equal to its RMS value
The same as its peak-to-peak value
Both (B) and (C)
None of these
|
| 13 |
The sum of positive and negative peak values is called: |
Instantaneous value
Peak value
Rms valuie
Peak-to peak-value
None of these
|
| 14 |
The highest value reached by the voltage or current: |
In quarter cycle is called Instantaneous value
In half cycle is called peak-to-peak value
In one cycle is called peak value
In half cycle is called Instantaneous value
None of these
|
| 15 |
The entire wave form of sinusoidal voltage is actually a set of all the: |
Positive maximum value + V<sub>o</sub>and negative maximum value -V<sub>o</sub>
Posiotive maximum value +V<sub>o </sub>and zero
Zero and negative maximum value -V<sub>o</sub>
Any of these
None of these
|
| 16 |
The waveform of alternating voltage is a: |
Square
Rectangular
Saw-tooth
Sinusoidal
None of these
|
| 17 |
The wave form of alternating voltage is the graph between: |
Voltage across X-axis and time across y-axis
Current and time
Voltage along y-axis and time along x-axis
Voltage and current
Either (B) or (D)
|
| 18 |
The most common source of alternating voltage is: |
Motor
Transformer
AC genrator
Both (A) and (C)
Both (A) and (B)
|
| 19 |
The time interval during which the Voltage source changes its polarity once is known as: |
Time period T
Half the time period
Quarter the time period
Two third of the time period
None of these
|
| 20 |
Nowadays, Most of the electric energy is produced by the A.C. generators using: |
Hydal water
Geothermal energy
Solar energy
Biomass
Both (B) and (D)
|
| 21 |
Alternating current is produced by a voltage source which polarity: |
Remains the same
Reverse after period T
Keeps on reversing with time
Reverse after every time interval T/2
Both (C) and (D)
|
| 22 |
Alternating current can be transmitted: |
To long distance
At very high cost
At very low cost
Both (A) and (C)
Both (A) and (B)
|
| 23 |
The direction of induced current is always so as to oppose the cause which produces it. This is |
Lenz's law
Ampere's law
Faraday's law
Coulomb's law
None of these
|
| 24 |
Faraday's law of electromagnetic induction has been used in the construction of: |
Galvanometer
Voltmeter
Electric motor
Electric genrator
Commutator
|
| 25 |
The law of electromagnetic induction is related to: |
Coulomb
Ampere
Faraday
Lenz
None of these
|
| 26 |
The rate change of area expressed is expressed in: |
None of these
ms<sup>-1</sup>
m<sup>2</sup>s<sup>-2</sup>
ms<sup>-2</sup>
m<sup>2</sup>s<sup>-1</sup>
|
| 27 |
Plan of a coil makes an angle of 20º with the lines of magnetic field. The angle between B and vector area of plane of coil is:
|
Also 20<span style="font-family: "Times New Roman", serif; font-size: 12pt; text-align: justify;">º</span><p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;
line-height:107%;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
70<span style="font-family: "Times New Roman", serif; font-size: 12pt; text-align: justify;">º</span><p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;
line-height:107%;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
90<span style="font-family: "Times New Roman", serif; font-size: 12pt; text-align: justify;">º</span><p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;
line-height:107%;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
180<span style="font-family: "Times New Roman", serif; font-size: 12pt; text-align: justify;">º</span><p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt;
line-height:107%;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
None of these
|
| 28 |
A square loop of wire is moving through a uniform magnetic field. The normal to the loop is oriented parallel to the magnetic field. The emf induced in the loop is: |
Zero
Of smaller magnitude
Of larger magnitude
Sometimes B, sometimes C
Neither of these
|
| 29 |
A metal road of length 1m is moving at a speed of 1 ms-1In a direction making angle of 30º with 0.5 Y magnetic field. The emf produced in the rod is:
|
0.25 N
0.25 V
2.5 V
2.5 N
25 V
|
| 30 |
Motional emf is called motional: |
Electromagnetic force and is measured in newtons
Electromotive force and is measured in volt
Electromotive force and is measured in newtons
Electromagnetic force and is measured in volts
None of these
|
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