Electrical World

Ques.[1] For torque transmission over a long distance with the help of electrical wires only, which of the following two synchros are used ? (a)CX and CT (b)CX and CR (c)CX and CD (d)CT and CD Answer :B  Ques.[2] Squirrel-cage induction motor is finding increasing application in high-power servo systems because new methods have been found to (a) increase its rotor resistance (b) control its torque (c) decrease its intertia (d) decouple its torque and flux.   Answer:D   Ques.[3] The control ........................ synchro has three- phase winding both on its stator and rotor. (a) differential (b) transformer (c) receiver (d) transmitter Answer:A  Ques.[4] A dc servomotor is similar to a regular d.c. motor except that its design is modified to cope with (a) electronic switching (b) slow speeds (c) static conditions (d) both (b) and (c).   Answer:D  Ques.[4] The low-torque synchros cannot be used for (a) torque transmiss...

Ques.[1] A variable reluctance stepper motor is constructed of .................. material with salient poles. (a) paramagnetic (b) ferromagnetic (c) diamagnetic (d) non-magnetic Answer: B Ques.[2] In a three-stack 12/8-pole VR motor, the rotor pole pitch is (a) 15º (b) 30º (c) 45º (d) 60º Answer: C Ques.[3] A stepper motor having a resolution of 300 steps/rev and running at 2400 rpm has a pulse rate of— pps. (a) 4000 (b) 8000 (c) 6000 (d) 10,000   Answer: C Ques.[4] If a hybrid stepper motor has a rotor pitch of 36º and a step angle of 9º, the number of its phases must be (a)4 (b)2 (c)3 (d)6 Answer: A Ques.[5] The rotor of a stepper motor has no (a) windings (b) commutator (c) brushes (d) all of the above. Answer: D Ques.[6] A stepping motor is a .................. device. (a) mechanical (b) electrical (c) analogue (d) incremental Answer: D Ques.[7] The rotational speed of a given stepper motor is determined solely by t...

 Hello Engineers. Welcome to Electrical Engineering Interview Questions Blog. Today i am going to share mcq based on single phase motor. Lets start... Ques: 1 A repulsion motor is equipped with   (a) a commutator   (b) slip-rings (c) a repeller   (d) neither (a) nor (b).   Answer : A  Must Read: Single Phase Induction MCQ Part 2 Interview Questions On Transformer Ques:2 If starting winding of a single-phase induction motor is left in the circuit, it will (a) draw excessive current and overheat (b) run slower (c) run faster (d) spark at light loads. Answer : A   Ques:3 Each of the following statements regarding a shaded-pole motor is true except (a) its direction of rotation is from un- shaded to shaded portion of the poles (b) it has very poor efficiency (c) it has very poor p.f. (d) it has high starting torque. Answer : D Ques:4 The direction of rotation of a single-phase motor can be reversed by (a) reversing con...