Multiple Choice Questions on Electrical Engineering and Practice Test 7
Last updated on October 31st, 2014 at 02:44 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 seventh 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 Hopkinson’s Law related to Magnetic Circuit Hopkinson’s’ law is same for magnetic circuit as Ohms law for electrical circuit 2 Which of the material having negative temperature coefficient of resistance? Carbon The temperature coefficient of carbon at 20 degree centigrade is 5×10⁻⁴ per degree centigrade 3 Q factor of a coil is given by ωL/R 4 A capacitor and resistor of equal impedance are connected in series and sinusoidal voltage applied. The voltage drop across each is equal but what happens when the frequency is increased? Vc˂Vr With frequency increased, capacitor impedance reduces and therefore voltage drop also reduces. 5 Energy stored in a capacitor is given by ½QV Joules 6 Faradays First law of electrolysis state that the mass of ions liberated at an electrode is directly proportional to the quantity of electricity passes through the electrolyte 7 Power in a AC circuit is given by VICosφ where V is voltage, I is current and φ is the phase angle between voltage and current, the value of V and I in this equation is rms value The power in a AC circuit is actually ½*Vm*Im*pF which becomes (Vm/√2)(Im/√2)pF; and Vm/√2 is rms value 8 The motor which is not used for railway traction application is Slip ring three phase induction motor Slip ring induction motor is used where starting torque is high but speed control is not required 9 Guard rings in a transmission line are provided to to equalize the capacitance of each unit of the string 10 The material used for armouring of single core cable is of Aluminium Non-magnetic material is necessary to avoid electro-magnetic induction induced emf and flow of current 11 Speed of an diesel-electric locomotive is controlled by varying the voltage and frequency of applied power supply Fuel injection variation is deliver more power to the motor system and there is one gear reduction instead multiple gear reduction in automobiles. All of them is to create confusion in the mind of candidates 12 IGBT drives has the advantage over GTO for All of them 13 In a transmission line, what happens to the sag if the span is doubled? will become eight times 14 Which is not a condition necessary for parallel operation of transformer Identical MVA ratio 15 What is Bucholz relay? Protection of oil filled Transformer 16 A complex function is given by i=14Sinwt+2Sin5wt; what is the rms value of current 10 Irms=√(14²+2²)/2=10
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Question 1 of 16
1. Question
A complex function is given by i=14Sinwt+2Sin5wt; what is the rms value of current
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Question 2 of 16
2. Question
Energy stored in a capacitor is given by
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Question 3 of 16
3. Question
Hopkinson’s Law related to
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Question 4 of 16
4. Question
Which of the material having negative temperature coefficient of resistance?
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Question 5 of 16
5. Question
Q factor of a coil is given by
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Question 6 of 16
6. Question
A capacitor and resistor of equal impedance are connected in series and sinusoidal voltage applied. The voltage drop across each is equal but what happens when the frequency is increased?
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Question 7 of 16
7. Question
Faradays First law of electrolysis state that
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Question 8 of 16
8. Question
Power in a AC circuit is given by VICos_ where V is voltage, I is current and _ is the phase angle between voltage and current, the value of V and I in this equation is
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Question 9 of 16
9. Question
The motor which is not used for railway traction application is
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Question 10 of 16
10. Question
Guard rings in a transmission line are provided to
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Question 11 of 16
11. Question
The material used for armouring of single core cable is of
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Question 12 of 16
12. Question
Speed of an diesel-electric locomotive is controlled by
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Question 13 of 16
13. Question
IGBT drives has the advantage over GTO for
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Question 14 of 16
14. Question
In a transmission line, what happens to the sag if the span is doubled?
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Question 15 of 16
15. Question
Which is not a condition necessary for parallel operation of transformer
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Question 16 of 16
16. Question
What is Bucholz relay?
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