1. In split-phase motor auxiliary winding is of ?

thick wire placed at the bottom of the slots

thick wire placed at the top of the slots

thin wire placed at the top of the slots

thin wire placed at the bottom of the slots

Answer: thin wire placed at the top of the slots

Explanation:


2. Which of the following single-phase induction motors is generally used in time phonographs ?

Resistance start

Capacitor start capacitor run

Shaded pole

Universal

Answer: Shaded pole

Explanation:


3. Which of the following motors can be run on AC. as well as D.C. supply ?

Universal motor

Repulsion motor

Synchronous motor

Reluctance motor

Answer: Universal motor

Explanation:


4. The purpose of stator winding in the compensated repulsion motor is to ?

provide mechanical balance

Improve power factor and provide better speed regulation

prevent hunting in the motor

eliminate armature reaction

Answer: Improve power factor and provide better speed regulation

Explanation:


5. Which of the following motors is used in tape-recorders ?

Hysteresis motor

Reluctance motor

Capacitor-run motor

Universal motor

Answer: Hysteresis motor

Explanation:


6. If starting winding of a single-phase induction motor is left in the circuit, it will ?

run faster

spark at light loads

draw excessive current and overheat

run slower

Answer: draw excessive current and overheat

Explanation:


7. A universal motor is one which ?

can be operated either on D.C. or A.C. supply at approximately the same speed and output

can be marketed internationally

runs at dangerously high speed on no-load

none

Answer: can be operated either on D.C. or A.C. supply at approximately the same speed and output

Explanation:


8. In a split-phase motor the ratio of number of turns for starting winding to that for running winding is ?

less than one

more than one

one

two

Answer: less than one

Explanation:


9. If a single-phase motor runs hot the probable cause cannot be ?

blown fuses

low voltage

high voltage

shorted stator coils

Answer: blown fuses

Explanation:


10. For a system involving sound recording and reproduction which motor would you select ?

Shaded-pole motor

Universal motor

Reluctance motor

Hysteresis motor

Answer: Hysteresis motor

Explanation: