Related Questions

In Weston synchronoscope the moving coil is connected across
A bus-bars
B incoming alternator
C fixed coils
D any of the above
A Weston synchronoscope is a
A moving coil instrument
B moving iron instrument
C dynamometer instrument
D none of the above
In a Weston frequency meter, the magnetic axes of the two fixed coils are
A Parallel
B Perpendicular
C Inclined at 60°
D Inclined at 15°
The EMF of Weston standard cell is measured using
A Moving- iron meter
B Moving-coil meter
C Digital Volt meter
D Potentiometer
E.m.f. of a Weston cell is accurately measured by
A electrostatic voltmeter
B hot wire voltmeter
C isothermal voltmeter
D electrodynamic voltmeter
A Weston frequency meter is
A moving coil instrument
B moving iron instrument
C dynamometer instrument
D none of the above
In a A.C. series motor armature coils are usually connected to commutator
A through resistance
B through reactances
C through capacitors
D solidly
The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures
A Active power in R phase
B Active power of Y phase
C Reactive power of R phase
D Power proportional to 3 phase power if the load is balanced
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
The field coils of D.C. generator are usually made of
A Mica
B Copper
C Cast iron
D Carbon

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