Multiple Choice Questions on Electrical Engineering and Practice Test 8
Last updated on October 31st, 2014 at 02:43 pm
There are 16 questions to be attended in 20 minutes. The questions are on Electrical Engineering. Read the study material before making an attempt so that you build your confidence in the subject. This is the eighth of the series of 10 questions paper that will appear before the RRB examination for SSE and JE to be held in Dec.
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There are 16 questions to be attended in 20 minutes. The questions are on Electrical Engineering. Read the study material before making an attempt so that you build your confidence in the subject. This is the first of the series of 10 questions paper that will appear before the RRB examination for SSE and JE to be held in Dec.
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The Answer Key:
Sr No Question Answer Remarks 1 Heating results in resistivity of insulators to decreases Heat energy results in some more electrons to loose from the orbit and become free thus adding to conduction 2 The trend of the current drawn by an incandescent lamp shows very high and than reduces and becomes constant The current is high is first but when the resistance heats up, the current reduces and remains constant at that level 3 When a sinusoidal voltage is applied across a capacitor, the current always leads the voltage 4 A capacitor of 0.1 micro farad is connected in series with a 1000 ohms resistance and 100 V battery source. Calculate the time taken by the voltage rise across the capacitor to 63.2 V. 0.00001 secs The voltage will rise to 63.2% in a time constant of RC equal to 10⁻⁴ secs. 5 Five capacitors of 1,2,3,4 and 5 micro farads are connected in series, what is net capacitance? 0.438 1/C= 1+1/2+1/3+1/4+1/5=60+30+20+15+12/60 = 137/60 or C = 60/137 = 0.438. But check the value has be less than 1, therefore it can be 2 or3 and the sum of capacitor of 1 and 2 micro farad will give 2/3 micro farad means total has to be less than this figure. 6 The ratio of Ah and Wh efficiency is always more than one Wh takes into consideration the terminal voltage which does not remain constant and drops thus Wh is slightly less than Ah 7 Which one is having the highest dielectric constant? distilled water air=1; paper 1.5-3; mica 4-9; distilled water 34-78 8 Which motor is used with the compressor of inverter base air conditioner? Single phase induction motor Single phase induction motor is used and inverter provides variable frequency and variable voltage to regulate the speed depending on Ac load on the system. 9 There are no transients in purely resistive circuit Transients in a circuit appears due to storage of electro-magnetic and electro-static energy in inductor and capacitor 10 The impedance of a transmission line having negligible resistance is given by √L/C 11 Specific Energy Consumption in electric traction is defined as energy consumed in kWh/1000 Gross Tonne of load GTKM is gross tonne kilometre and thus is the unit of energy utilised in hauling load. Unit of GTKM is taken to compare and generally for freight train the SEC is of the order of 6-8 whereas for Metro train 35-45; passenger train 25-35; and Mumbai sub-urban train it is 25-35. SEC depends on the frequency of stoppages, acceleration level and maximum speed on which the train run 12 What device is used to restrict the affect of high di/dt in thyristor circuits? inductor Inductor does not allow current to undergo sudden change when passing through it 13 The earth wire is taken above the conductors then what is the induced voltage from cloud of voltage V, capacitance between cloud and earth wire as C1 and earth wire and earth is C2; V*C1/(C1+C2) It is capacitive distribution of voltage and C1/(C1+C2) 14 What happens when the frequency of the supply voltage is doubled as compared to frequency for which it is designed Eddy and hysteresis losses increases 15 Fuse has the advantage over MCB due to reliability There is no mechanical system involved and if the fuse wire draws more current, it will certainly fuse. The other options are actually advantages of using MCB 16 What is effect of voltage and frequency on dielectric loss directly proportional to votlage square and frequency Dielectric loss = k*V²*f
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Question 1 of 16
1. Question
Heating results in resistivity of insulators to
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Question 2 of 16
2. Question
The trend of the current drawn by an incandescent lamp shows
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Question 3 of 16
3. Question
When a sinusoidal voltage is applied across a capacitor, the current always
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Question 4 of 16
4. Question
A capacitor of 0.1 micro farad is connected in series with a 1000 ohms resistance and 100 V battery source. Calculate the time taken by the voltage rise across the capacitor to 63.2 V.
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Question 5 of 16
5. Question
Five capacitors of 1,2,3,4 and 5 micro farads are connected in series, what is net capacitance?
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Question 6 of 16
6. Question
The ratio of Ah and Wh efficiency is always
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Question 7 of 16
7. Question
Which one is having the highest dielectric constant?
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Question 8 of 16
8. Question
Which motor is used with the compressor of inverter base air conditioner?
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Question 9 of 16
9. Question
There are no transients in
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Question 10 of 16
10. Question
The impedance of a transmission line having negligible resistance is given by
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Question 11 of 16
11. Question
Specific Energy Consumption in electric traction is defined as
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Question 12 of 16
12. Question
What device is used to restrict the affect of high di/dt in thyristor circuits?
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Question 13 of 16
13. Question
The earth wire is taken above the conductors then what is the induced voltage from cloud of voltage V, capacitance between cloud and earth wire as C1 and earth wire and earth is C2;
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Question 14 of 16
14. Question
What happens when the frequency of the supply voltage is doubled as compared to frequency for which it is designed
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Question 15 of 16
15. Question
Fuse has the advantage over MCB due
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Question 16 of 16
16. Question
What is effect of voltage and frequency on dielectric loss
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