Multiple Choice Questions on Electrical Engineering and Practice Test 4
Last updated on October 31st, 2014 at 03:15 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 fourth 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 Ampere-second is the unit of Charge I=Q/t; I*t=Q i.e. ampere-sec is the unit of charge 2 Resistivity of this material is least as compared to others Silver 3 The impedance offered by an inductor of inductance L at frequency f is given by 2πf*L 4 Thermo-couple works on the principle of Any junction of dissimilar metals will have its resistance change in proportion to the change in temperature 5 How much energy is required to raise a lift with load of 5 tonne through a distance of 30 meter assuming 25% losses in motor and gear mechanism. Assume g=10 m/sec² 0.5 units Work done by the lift = Wh = mgh = 5*1000*10*36 = 1.8×10⁶ J; 1kWh = 1000x(J/sec)*3600 = 36×10⁵; From this we get 1.8×10⁶/36×10⁵ = 0.5 kWh 6 The capacity of battery reduces with reduce in temperature 7 What current will flow through a source having an impedance of 28/-32° and applied with a voltage source of 140/20°? 5/52° Simple property of division in polar form where denominator angle is subtracted from numerator angle and magnitude is divisible as normal 8 An induction motor running at a slip of s, will deliver power at shaft in reference to air gap power given is given by a formula (1-s²)Pg sPg will be the rotor losses and balance will be shaft power 9 Corona discharge in high voltage transmission life is the effect of electro static discharge 10 What is the approximate ratio of crossectional area of Aluminium and Copper Cable for the same current carrying capacity 1.6 11 A mercury vapour lamp emits light which appears to human eyes bluish 12 IGBT stands for insulated gate bio-polar transistor 13 The protection against lightening on transmission line is provided by ground wire running on top of transmission line ground wire running on top of transmission line and Surge arresters are used for the protection of transmission lines from lightening 14 No load current of a transformer is equal to vector sum of iron loss current and magnetizing current There are two portion of current for losses which active and another reactive to magnetizing field which is the main current lagging with the voltage. 15 Why one of the pin of a three pin plug is longer than other two? Earth terminal of the plug should connect the socket earth first The question is for a longer terminal and necessity is for eath to make first connection. In case there is a fault in the appliance, the same will first get earthed. 16 Two resistance of 3 ohms and R ohms are connected in series with a voltage source of 14 V. What is the value of R if the power loss across R is 16W 4 The current flowing is 14/(3+R); 16= 14*14*R/(3+R)² and by solving we get R=4,9/4
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Question 1 of 16
1. Question
Ampere-second is the unit of
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Question 2 of 16
2. Question
Resistivity of this material is least as compared to others
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Question 3 of 16
3. Question
The impedance offered by an inductor of inductance L at frequency f is given by
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Question 4 of 16
4. Question
Thermo-couple works on the principle of
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Question 5 of 16
5. Question
How much energy is required to raise a lift with load of 5 tonne through a distance of 30 meter assuming 25% losses in motor and gear mechanism. Assume g=10 m/sec_
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Question 6 of 16
6. Question
The capacity of battery reduces with
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Question 7 of 16
7. Question
What current will flow through a source having an impedance of 28/-32 degree and applied with a voltage source of 140/20degree?
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Question 8 of 16
8. Question
An induction motor running at a slip of s, will deliver power at shaft in reference to air gap power given is given by a formula
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Question 9 of 16
9. Question
Corona discharge in high voltage transmission life is the effect of
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Question 10 of 16
10. Question
What is the approximate ratio of crossectional area of Aluminium and Copper Cable for the same current carrying capacity
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Question 11 of 16
11. Question
A mercury vapour lamp emits light which appears to human eyes
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Question 12 of 16
12. Question
IGBT stands for
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Question 13 of 16
13. Question
The protection against lightening on transmission line is provided by
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Question 14 of 16
14. Question
No load current of a transformer is equal to
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Question 15 of 16
15. Question
Why one of the pin of a three pin plug is longer than other two?
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Question 16 of 16
16. Question
Two resistance of 3 ohms and R ohms are connected in series with a voltage source of 14 V. What is the value of R if the power loss across R is 16W
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