Related Questions

The commutator segments are connected to the armature conductors by means of
A Copper lugs
B Resistance wires
C Insulation pads
D Brazing
Sparking at the commutator of a D.C. motor may result in
A Damage to commutator segments
B Damage to commutator insulation
C Increased power consumption
D All of the above
As the load is applied to a synchronous motor, the motor takes more armature current because
A The increased load has to take more current
B The rotor by shifting its phase backward causes motor to take more current
C The back e.m.f. decreases causing an increase in motor current
D The rotor strengthens the rotating field causing more motor current
The field coils of D.C. generator are usually made of
A Mica
B Copper
C Cast iron
D Carbon
In a Weston synchronoscope, the fixed coils are connected across
A bus-bars
B incoming alternator
C a lamp
D none of the above
The coils of D.C. motor starter are wound with wire of
A Copper
B Kanthal
C Manganin
D Nichrome
A survey was conducted among the students of Khulna University to find out how many forms of physical exercise usually swam, 25% said they usually did jogging, 20% said they played cricket, 15% said they usually played football and 20 respondents said they did not take any form of exercise. From the above findings it can be concluded that.
A The student of khulna University do not usually take physical exercise.
B No respondent took more than one form of exercise.
C The method of data collection was not valid.
D Some of the respondents took more than one form of exercise.
সিরিজে সংযুক্ত একটি এ্যামিটার এবং একটি অজানা রোধ দুটি একই রকম 1.5 V ব্যাটারীর দুই প্রান্তে সংযুক্ত আছে। যখন ব্যাটারী দুটি সিরিজে সংযুক্ত থাকে তখন এ্যামিটার। amp রিডিং প্রদর্শন করে। আবার ব্যাটারী দুটি সমান্তরালে সংযুক্ত করলে 0.6 amp রিডিং প্রদর্শন করে। ব্যাটারীর আভ্যন্তরিন রোধ কত ? (An ammeter and an unknown resistance are connected in series across two identical batteries of each 1.5 V. The ammeter shows current I amp and 0.6 amp when the batteries are connected in series and parallel, respectively. What is the internal resistance of the battery?)
A 13Ω
B 12Ω
C 1Ω
D 0.1Ω
E 23Ω
A.C. series motor as compared to D.C. series motor has
A smaller brush width
B less number of field turns
C more number of armature turns
D less air gap
E all of the above
While starting a synchronous motor by induction motor action, field winding is usually
A connected to D.C. supply
B short-circuited by low resistance
C kept open-circuited
D none of the above

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