Question

In: Electrical Engineering

81. Given: Service drop conductors passing over a swimming pool have a vertical clearance from the...

81. Given: Service drop conductors passing over a swimming pool have a vertical clearance from the water surface of 18 ft. these conductors must be located a minimum of _____ ft. horizontally from the outer edge of the swimming pool.

A. 0

B. 10

C. 15

D. 22.5

82. What is the full load current in amperes for a 1-hp single-phase, 115-volt, AC motor?

A. 2.1

B. 8

C. 8.4

D. 16

83. If a branch circuit supplies a single 14-ampere non-motor-operated appliance without an over current protection rating, the rating of the over current protection shall not exceed _____ percent of the appliance rated current.

A. 90

B. 100

C. 125

D. 150

84. What is the maximum overcurrent protection rate in amperes permitted for an appliance without a motor that has an input rating of 40 amperes?

A. 30

B. 40

C. 50

D. 60

85. The overload protection for a 3-phase, 25 Hp, 480-volt motor shall be selected

A. from the motor nameplate full load current

B. from the full load current in table 430-150 of the NEC

C. from the locked-rotor current in table 430-150 of the NEC

D. as a percentage of the motor branch-circuit overcurrent protection

86. Branch-circuit conductors that serve a 3-phase, 230-volt, 15 ph induction-type motor shall have an allowance ampacity of at least _____ amperes.

A. 42

B. 46.2

C. 52. 5

D. 60.5

87. Disregarding exceptions, where the design and operation of a generator does not prevent overloading the ampacity of the undergrounded phase conductors shall be at least ______ percent of the name plate current rating of the generator.

A. 80

B. 100

C. 115

D. 125

88. A circuit that supplies a 1/2 -hp motor that operates utilization equipment fastened in place in conjunction with other loads shall be calculated by adding the sum of the other loads plus _____ percent of the largest motor.

A. 100

B. 125

C. 150

D. 175

89. When the design and operation of the generator will prevent overloading the conductors shall not be less than ______>

A. the same hp as the generator

B. 100 percent of nameplate current

C. 115 percent of nameplate current

D. 115 percent of the hp of the generator

90. Transformers for sight located in an attic or soffit shall have a permanent walkway of at least _____ in. wide.

A. 12

B. 18

C. 24

D. 36

Solutions

Expert Solution

81. Given: Service drop conductors passing over a swimming pool have a vertical clearance from the water surface of 18 ft. these conductors must be located a minimum of _____ ft. horizontally from the outer edge of the swimming pool.

A. 0

B. 10

C. 15

D. 22.5

Answer:

Overhead network-powered broadband communication systems conductors' minimum clearance is 22.5 ft from the water's edge of swimming pool

Therefore option D) is correct

82. What is the full load current in amperes for a 1-hp single-phase, 115-volt, AC motor?

A. 2.1

B. 8

C. 8.4

D. 16

Answer:

Full load current , IL = Rated Power/(voltage * PF) = 1 *746/(115 * 0.8) = 8.10 A

PF - Power factor, generally we take 0.8

1 HP = 746 watt

Therefore approximately we can take 8 A

Option B) is correct

83. If a branch circuit supplies a single 14-ampere non-motor-operated appliance without an over current protection rating, the rating of the over current protection shall not exceed _____ percent of the appliance rated current.

A. 90

B. 100

C. 125

D. 150

Answer:

The non-motor operated appliance over current protection rating should not exceed 125% of the appliance rated current.

Therefore option C) is correct

84. What is the maximum overcurrent protection rate in amperes permitted for an appliance without a motor that has an input rating of 40 amperes?

A. 30

B. 40

C. 50

D. 60

Answer:

The non-motor operated appliance over current protection rating should not exceed 125% of the appliance rated current.

Therefore maximum overcurrent protection rate = 125% of 40 = 50 A.

Therefore option C) is correct

85. The overload protection for a 3-phase, 25 Hp, 480-volt motor shall be selected

A. from the motor nameplate full load current

B. from the full load current in table 430-150 of the NEC

C. from the locked-rotor current in table 430-150 of the NEC

D. as a percentage of the motor branch-circuit overcurrent protection

Answer:

The overload protection for a 3-phase motor shall be selected from the motor nameplate full load current

Therefore option A) is correct

Manojponduru answered 1 year ago
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