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WorksheetsBMEL 3
Total questions: 10
Worksheet time: 5mins
Low voltage connection of a six leads dual voltage three phase motor is ________
a. Wye
b. Delta
c. Parallel Wye
d. Parallel Delta
A six leads dual voltage three phase motor is connected Delta on a 440V supply voltage, Each phase winding will receive _______
a. 220V
b. 254V
c. 380V
d. 440V
To reverse the rotation of a Three Phase motor interchange connection of________
a. starting winding
b. any two line leads
c. all three line leads
d. any phase windings
If the control fuse is blown, most likely the problem is ______
Single phasing fault
Stop push button is shorted
Short circuit in the motor windings
Short circuit in the magnetic contactor coil
Short circuit protection is accomplished by means of ________
Shunt Trip
Thermal Trip
Magnetic Trip
Delayed action Trip
A six leads dual voltage three phase motor is connected Delta to a 220V supply, if rated Current for this connection is 21 A corresponding current for the Wye Connection will be
a. 6.06 A
b. 7.0 A
c. 12.13A
d. 21A
A circuit diagram shows a contact marked 97-98 this contact is a _________
a. OL contact
b. Main Contact
c. Latching contact
d. Interlocking contact
A contact drawn in an electrical drawing is marked 4a. This indicates:
a. N.C. Timer contact
b. N.O. Auxiliary contact
c. N.C. Overload contact
d. N.C. Push button contact
The approximate starting current of a direct on Line (DOL) motor starter
a. The rated current of the motor
b. 2 times the rated motor current
c. 5 times the motor rated current.
d. 10 times the motor rated current.
_____are a form of electrical relay found on most electrically powered motors. They act as a go-between for direct power sources, and high-load electrical motors in order to homogenize or balance out changes in electrical frequency which may come from a power supply as well as to act as a safeguard.
a. thermal overload relays
b. magnetic contactors
c. on delay timer
d. off delay timer
