T10 Quiz 1-phase I.M. Phase-5

Q1:- The capacitors used for AC motor starting have no

1.  Polarity makings
2. Voltage rating
3.  Definite capacitance value
4. Dielectric rating

ANSWER:-1

Q2:- The capacitor start motor is connected in series with the

1. running winding
2. stating winding and centrifugal switch
3. compensating winding
4. spit phase winding

ANSWER:-2

Q3:- Before a capacitor start motor can reverse its direction of rotation,the

1. centrifugal switch must be opened
2. running winding must be opened
3. starting winding must be connected to the line
4. capacitor connections must be changed

ANSWER:-3

Q4:- The starting winding is connected for opposite polarity to reverse the direction of rotation of a motor running at full spee1d. This is accomplished be short-circuiting the 

1. centrifugal switch
2. running winding
3. starting winding
4. capacitor

ANSWER:-1

Q5:- A dual voltage single phase motor can be operated on either

1. 120/240 volts
2. 208/240 volts
3. 240/277 volts
4. 240/480 volts

ANSWER:-1

Q6:- A permanent split phase capacitor motor does NOT have

1. a staring winding
2. a centrifugal switch
3. reversing capabilites

ANSWER:-2

Q7:- The speed of a two capacitor run motor is decreased by 

1. increasing the capacitance value 
2. decreasing the capacitance value
3. increasing the strength of the stator magnetic field
4. decreasing the strength of the stator magnetic field 

ANSWER:-4

Q8:- A 250 uF , 250 volt capacitor is defective. How many 250uF 150 volt capacitor are required and how are they connected to obtain 250 uF at 250 volts?

1. two connected in series
2. two connected in parallel
3. four connected in series parallel
4. four connected in parallel

ANSWER:-3

Q9:- Which of the formula is used to find the equivalent capacitance of two capacitor in series?

1. C=(C' C")/C'+C"
2. C=C'+C"
3. C=(C' C")/(C')
4. C=C'-C"

ANSWER:-1

Q10:-A capacitor motor has difficulty of staring . What is the problem cause?

1. reversed magnetic field
2. shorted commutator segments
3. shorted winding
4. all of the above

ANSWER:-3