Wireman 2nd year mcq
Wireman – Semester 3 Module 7 – AC Single phase induction motors
160 : What is the basic working principle of single phase universal motors?
A : Same as DC Motors
B : Faradays laws
C : Rotating magnetic field theory
D : Flemings right hand rule
161 : Which motor has very low starting torque?
A : Three phase squirrel cage motor
B : Three phase slip ring motor
C : Resistance start induction run motor
D : Universal motor
162 : Which type of rotor is used in capacitor start induction run single phase motor?
A : Slip ring type
B : Commutator type
C : Wound rotor type
D : Squirrel cage type
163 : How many number of windings are there in split phase resistance type induction motor?
A : 1
B : 2
C : 3
D : 4
164 : Which winding circuit will have more resistance in split phase resistance type induction motor?
A : Main winding
B : Compensating winding
C : Auxilary winding
D : Damper winding
165 : Which motor operates without centrifugal switch?
A : Permanent capacitor motor
B : Capacitor start capacitor run motor
C : Capacitor start induction run motor
D : Resistance induction run motor
166 : Which winding is disconnected by the centrifugal switch in split phase resistance type induction motor
A : Main winding
B : Auxilary winding
C : Compensating winding
D : Damper winding
167 : Which speed the centrifugal switch acts in a single phase induction motor?
A : About 70% of speed
B : About 25% of speed
C : About 50% of speed
D : At full speed
168 : Which single phase induction motor has high starting torque?
A : Split phase induction motor
B : Capacitor start induction run motor
C : Shaded pole motor
D : Two value Capacitor motor
169 : Which winding is disconnected at 70% of speed in a capacitor start induction run motor?
A : Auxilary winding
B : Main winding
C : Running winding
D : Damper winding
170 : What is the another name of main winding in a single phase capacitor start induction run motor?
A : Auxilary winding
B : Damper winding
C : Running winding
D : Starting winding
171 : What is the part marked as X?
A : Main coil
B : Shading coil
C : Yoke
D : Poles
172 : What is the material used to make the shading coil of a shaded pole motor?
A : Aluminium
B : Brass
C : Silver
D : Copper
173 : Which single phase motor operates in both AC and DC supply?
A : Shaded pole motor
B : Two value Capacitor motor
C : Universal motor
D : Split phase induction motor
174 : What is the another name of Universal motor?
A : AC single phase series motor
B : Three phase induction motor
C : Shaded pole motor
D : Synchronous motor
175 : Which of the motor has wound rotor and commutator?
A : Capacitor start capacitor run motor
B : Capacitor start induction run motor
C : Shaded pole motor
D : Universal motor
176 : What is the value of starting torque for a universal motor?
A : 100 % of full load torque
B : Below 50% of full load torque
C : 450 % of full load torque
D : 150 % of full load torque
177 : Which motor runs at synchronous speed?
A : Capacitor start induction run motor
B : Shaded pole motor
C : Universal motor
D : Hysteresis motor
178 : Which motor stator is wound for three phase?
A : Reluctance motor
B : Capacitor start induction run motor
C : Shaded pole motor
D : Universal motor
179 : Which motor stator consists of multiple salient electro magnet poles?
A : Shaded pole motor
B : Repulsion motor
C : Capacitor start induction run motor
D : Universal motor
180 : Which of the motor has step movements?
A : Shaded pole motor
B : Repulsion motor
C : Stepper motor
D : Universal motor
181 : Which type of winding is done in the repulsion motor?
A : Distributed AC winding
B : DC lap or wave winding
C : Damper winding
D : Compensating winding
182 : Which motor is used in food mixer?
A : Universal motor
B : Stepper motor
C : Capacitor start induction run motor
D : Repulsion motor
183 : Which motor is used for refrigerators and air conditioners?
A : Universal motor
B : Stepper motor
C : Capacitor start induction run motor
D : Two value Capacitor motor
184 : Which motor is used in toys and hair dryers?
A : Stepper motor
B : Universal motor
C : Shaded pole motor
D : Synchronous motor
185 : What is the speed of rotating magnetic field in a 3f induction motor?
A : Rotor speed
B : Synchronous speed
C : Motor speed
D : Rated speed
186 : Which equation is used for calculation synetronous speed of 3f induction motor.
187 : What is the synchronosis speed of a 3 phase induction motor if the supply frequency is 50 Hz and number of pole is 4?
A : 1400 rpm
B : 1500 rpm
C : 1450 rpm
D : 1000 rpm
188 : Name the part marked as X?
A : Terminal box
B : Yoke/Irame
C : Stator winding
D : Laminated steel core
189 : Which material is used to wound rotor of squirrel cage induction motor?
A : Aluminium
B : Enamelled copper conductor
C : Silicon steel
D : Copper bars
190 : Which part of squirrel cage rotor is short circuited?
A : End rings
B : Shaft
C : End cover hysteresis
D : Bearings
191 : Why the core of 3f induction motor is laminated?
A : To reduce friction loss
B : To reduce eddy current loss
C : To reduce hysterism loss
D : To reduce starting current
192 : What is the equation for rotor frequency of 3-phase induction motor?
2 Comments
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