Q.46 Which of the following requirement is must for reliable normal operation of electrical apparatus?
A. Rated current ≥ Actual load current
B. Rated voltage ≥ working voltage
C. Both A and B
D. Rated current ≤ actual load current and rated voltage ≤ working voltage
Ans.: C
Q.47 In electrical equipment the maximum working voltage during working is
A. exceed the rated voltage by 10-15 percentage
B. dos not exceed the rated voltage by 10-15 percentages
C. same as rated voltage by 10-15 percentage
D. any of the above depend on load variation
Ans.: B
Q.48 The maximum current which a given electrical equipment will able to operate continuously with temperature rise is within the permissible limit. This is called___
A. rated current
B. maximum current
C. Nominal current
D. Both A or C
Ans.: D
Q.49 Electrical equipment and machines are designed to ___
A. outdoor applications
B. indoor applications
C. Either A or B
D. neither A or B
Ans.: C
Q.50 In normal operating conditions of all the electrical apparatus or circuit elements of an electrical system carry current whose magnitude depends upon the ____
A. value of generator current and the effective system resistance of all the power system elements
B. value of generator voltage and the effective system impedances of all the power system elements
C. value of generator voltage and the effective system resistance of all the power system elements
D. value of generator exciter and the effective system impedances of all the power system elements
Ans.: B
Q.51 The lesser the effective impedance in faulty circuit then the ____
A. greater is the short circuit current
B. lesser is the short circuit current
C. greater is the system voltage
D. any of the above depend on fault magnitude
Ans.; A
Q.52 What is the harmful effect of short circuits___
A. Flow of heavy current will overheat the equipment
B. short circuit current carrying parts produces forces of electro-dynamic interaction
C. it may damage or destroy the equipment
D. all of the above
Ans.: D
Q.53 The ability of a switching device to interrupt a short circuit current is known as___
A. rated working voltage
B. rated breaking current
C. short circuit current
D. maximum withstand current
Ans.: B
Q.54 All the electrical elements are designed for thermal and dynamic stability because
A. sufficient to withstand the largest possible flow of short circuit current
B. sufficient to withstand the rated current flowing during normal operation
C. sufficient to withstand the rated current flowing during abnormal operation
D. all of the above
Ans.: A
Q.55 Which of the following severest condition in service?
A. short circuit
B. switching device during short circuit
C. switching device during normal operation condition
D. switching device during opening or disconnection of any equipment
Ans.: B
Q.56 The defect on electrical equipment due to which the current is diverted from the intend path is known as____.
A. normal flow of current
B. maximum flow of current
C. Fault current
D. breaking current
Ans.: C
Q.57 a fault current which cause the reduction of insulation strength
A. between phase conductors
B. between phase conductors and earth
C. between phase conductors and any earth screen surrounding the conductors
D. all of the above
Ans.: D
Q.58 The Abnormal condition is more on___
A. generators
B. switching or protecting devices
C. power lines
D. control devices
Ans.: C
Q.59 A high insulation level provides in order of _____ the nominal value of voltage.
A. 1 to 2 times
B. 3 to 5 times
C. 10 to 15 times
D. 5 to 10 times
Ans.: B
Q.60 Breakdown may occurs at normal voltage due to ___
A. ageing of insulation
B. deterioration of insulation
C. damaged caused by heavy wind blowing, tree falling across lines, birds shorting out line etc
D. all of the above
Ans.: D
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