T10 QUIZ Phase-7 (1-phase I.M.)

Q1:- Applying A.C. to a D.C. shunt motor field causes a high impedance because of the winding's

1. high resistance
2. inductive reactance
3. high induced voltage
4. capacitive reactance

ANSWER:-2

Q2:- In universal motor armature reaction is reduced by

1. shifting the brushes
2. using equalizer connection
3. connecting a compensating winding in series with the armature.
4. increasing the number of armature coils

ANSWER:-3

Q3:- An amplidyne is actualy a/an

1. D.C. amplifier
2. A.C. amplifier
3. induction motor
4. 3-phase generator

ANSWER:-1

Q4:- In normal situation which motor run at 5000 rpm 

1. synchronous motor
2. induction motor 
3. universal motor
4. none

ANSWER:-3

Q5:- A D.C. series motor does not operate on A.C.becauses

1. poor efficiency on A.C.
2. poor power Pf
3. excessive sparking on A.C.
4. all

ANSWER:-4

Q6:-Single phase motor are classified on the basis of 

1. construction
2. starting method
3. size
4. rpm
5. both construction and starting method.

ANSWER:-5

Q7:- To overcome the effects of poor power pf an A.C. series motor uses

1. lamination iron in the motor frame
2. high resistance windings
3. a brush shifting yoke
4. more filed turns than a D.C. field

ANSWER:-1

Q8:-The starting torque of capacitor start induction motor is

1. zero
2. low
3. equal to rated torque
4. more than rated torque

ANSWER:-2

Q9:- If single phase motor fail to start and giving humming noise because

1. low voltage
2. high voltage
3. wrong connection
4. due to short circuited winding 

ANSWER:-4

Q10:- Which method is cheap and easy to start 1-phase motor 

1. resistance stat method 
2. induction start method
3. capacitance start method
4. split phase method

ANSWER:-3