pick one ? 44) Disconnects are required: a) To isolate the motor feeder b) To is
ID: 2084463 • Letter: P
Question
pick one ?
44) Disconnects are required:
a) To isolate the motor feeder
b) To isolate the motor controller
c) To isolate the motor
d) A and C
e) All of the above
45) Which of the following are acceptable disconnecting means
a) An unfused disconnect switch
b) A magnetic motor starter
c) A cord and plug
d) A and C but not B
e) A, B and C
46) Disconnects must be located:
a) Within line of sight of the device that they are to isolate
b) In a secure area to prevent tampering
c) Indoors
d) At a minimum height of 5’ (1.5m) to ensure that children cannot touch them
e) All of the above
47) Motor overload protection can be provided by:
a) A manual motor starter
b) An overload relay
c) A circuit breaker
d) A and B
e) All of the above
48) Low power supply voltage:
a) Is a desirable operating condition for a motor
b) Reduces the motor current
c) Reduces available power
d) Increases the armature current
e) Has no effect
Explanation / Answer
44- d) A & C because after disconnecting the motor or motor feeder both disconnects from supply.
45- d) A & C but not B because disconnnecting means disconnects the motor from main supply.
46- e) All of the above. As disconnecting switch is the main switch which connects or disconnects the main supply. so, it should be in securing area and it's reach must be out of children.
47- d) both A & B. A manuel starter consists of resistances. so, these resistances lowers the value of overload current and prevents motor from damage and a circuit breaker disconnects the motor from supply when the current reaches to a higher or lower limit. it is also called a current relay.
48- b) reduces the motor current. Low power supply voltage reduces the motor current because voltage applied to the terminals is decreased.
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