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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 two parallel and coplanar shafts are connected by gears having teeth parallel to the axis of the shaft. This arrangement is known as
A Spur gearing
B Helical gearing
C Bevel gearing
D Spiral gearing
In a Y-connected source feeding a ∆-connected load,
A Each phase of the load has one-third of the full line voltage across it
B Each phase of the load has two-thirds of the full line voltage across it
C Each phase of the load has the full line voltage across it
D Each phase of the load has a voltage across it equal to $$\sqrt 3 $$
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
A transistor is connected in CB mode. If it is not connected in CE mode with same bias voltages, the values of IE, IB and IC will ___________
A remain the same
B increase
C decrease
D none of the above
In a ∆-connected source driving a ∆-connected load, the
A Load voltage and line voltage are one-third the source voltage for a given phase
B Load voltage and line voltage are two-thirds the source voltage for a given phase
C Load voltage and line voltage cancel for a given phase
D Load voltage, line voltage, and source phase voltage are all equal for a given phase
In a ∆-connected source feeding a Y-connected load
A Each phase voltage equals the difference of the corresponding load voltages
B Each phase voltage equals the corresponding load voltage
C Each phase voltage is one-third the corresponding load voltage
D Each phase voltage is 60° Ωut of phase with the corresponding load voltage
In a glass tube type water indicator for a boiler, one end of the tube is connected to water space and the other end is connected to
A Water space also
B Chimney
C Steam space
D Superheater
For seccessful operation of two single phase transformer connected in parallel, the most essential condition is that their
A Percentage impledances are equal
B Polarities are properly connected
C Turns ration are exactly equal
D KVA rating are equal
What will happen if the transformers working in parallel are not connected with regard to polarity?
A The power factor of the two trans-formers will be different from the power factor of common load
B Incorrect polarity will result in dead short circuit
C The transformers will not share load in proportion to their kVA ratings
D Cannot be determined

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