Users Also Read
Read MCQ's/Objective questions
MCQ's Search Engine
D.C.Basic
A.C.Basic
D.C.Machine
A.C.Machine
A.C. Fundamentals
Alternators
Basic Electricity
Control Systems
D.C. Generators
D.C. Motors
Economics of Power Generation
Electric Heating
Electric Traction
Electric Welding
Electrical Engineering Materials
Electrical Installation and Wiring
Electrical Machine Design
Electrostatics
Electrolysis and Storage of Batteries
Electromagnetic Induction
Illumination
Industrial Drives
Magnetic Circuit & Electromagnetism
Measurement and Instrumentation
Network Theorems And Circuit Theory
Polyphase Induction Motors
Resistance and Ohm's law
Rectifiers and Converters
Refrigeration and Air conditioning
Switchgear and Protection
Synchronous Motors
Transformers
Transmission & Dist. of Elect. Power
Home⇒ Engineering⇒
Single phase induction motors
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ Which of the following single-phase induction
motors is generally used in
time phonographs ? Shaded pole [other wrong options] [Discuss in forum] Resistance start Capacitor start capacitor run Universal |
Q22 ⇒ The speed of a universal motor is
generally reduced by using gear trains [other wrong options] [Discuss in forum] V-belts brakes chains |
Q23 ⇒ The rotor of o hysteresis motor is made
of chrome steel [other wrong options] [Discuss in forum] aluminium cast iron copper |
Q24 ⇒ In a ceiling fan employing capacitor run
motor secondary winding surrounds the primary winding [other wrong options] [Discuss in forum] primary winding surrounds the
secondarly winding both are usual arrangements none of the above |
Q25 ⇒ Centrifiigal switch disconnects the
auxiliary winding of the motor at about
____percent of synchronous s'peed 70 to 80 [other wrong options] [Discuss in forum] 30 to 40 80 to 90 100 |
Q26 ⇒ Most of the fractional horsepower
motors have either plain or sleeve beariws [other wrong options] [Discuss in forum] hard and annealed bearings ball or roller bearings soft and porous bearings |
Q27 ⇒ A repulsion motor is equipped with commutator [other wrong options] [Discuss in forum] slip rings both (a) and (b) none of the above |
Q28 ⇒ Locked rotor current of a shaded pole
motor is slightly more than full load current [other wrong options] [Discuss in forum] equal to full load current less than full load current several times the full load current |
Q29 ⇒ Which of the following single-phase
motors will be cheapest ? Capacitor start motor [other wrong options] [Discuss in forum] Reluctance motor Capacitor run motor |
Q30 ⇒ Which motor has unsymmetrical rotor ? Reluctance motor [other wrong options] [Discuss in forum] Shaded-pole motor Split-phase motor Universal motor |
Q31 ⇒ Reluctance motors are singly excited [other wrong options] [Discuss in forum] doubly excited either of the above none of the above |
Q32 ⇒ If the ceiling fan, when switched on,
runs at slow speed in the reverse direction,
it can be concluded that capacitor is ineffective [other wrong options] [Discuss in forum] winding has burnt out bearings are worn out none of the above |
Q33 ⇒ In a repulsion motor, brushes are connected together by a jumper wire [other wrong options] [Discuss in forum] to starting winding to the external supply to stator winding |
Q34 ⇒ If the capacitor of a single-phase motor
is short-circuited the motor will not start [other wrong options] [Discuss in forum] the motor will run the motor will run in reverse direction the motor will run in the same direction at reduced r.p.m. |
Q35 ⇒ Which of the following motor will have
relatively higher power factor ? Capacitor run motor [other wrong options] [Discuss in forum] Shaded pole motor Capacitor start motor Split phase motor |
Q36 ⇒ A capacitor-start single phase induction
motor is switched on to supply with
its capacitor replaced by an inductor of
equivalent reactance value. It will not start at all [other wrong options] [Discuss in forum] start and then stop start and run slowly start and run at rated speed |
Q37 ⇒ The power factor of a single-phase induction
motor is usually lagging [other wrong options] [Discuss in forum] always leading unity unity to 0:8 leading |
Q38 ⇒ A universal motor can run on either A.C. or D.C. [other wrong options] [Discuss in forum] A.C. only D .C. only none of the above |
Q39 ⇒ Which of the following motors has
highest starting torque ? Capacitor-start motor [other wrong options] [Discuss in forum] Repulsion motor Shaped pole motor Split-phase motor |
Q40 ⇒ Which of the following Motors can be
used for unity power factor ? Schrage motor [other wrong options] [Discuss in forum] Capacitor run motor Shaded pole motor Hysteresis motor |
Or |