What will happen if the transformers working in parallel are not connected with regard to polarity?

Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in

A

short-circuiting of the secondaries

B

power factor of one of the transformers is leading while that of the other lagging

C

transformers having higher copper losses will have negligible core losses

D

loading of the transformers not in proportion to their kVA ratings

Two men and women are entrusted with a task. The second man needs three hours more to cope up with the job than the second man and the woman would need working together. The first man, working alone, would need as much time as second man and the woman working together. The first man working alone, would spend eight hours less than the double period of the time second man would spend working alone. How much time would the two men and the women need to complete the task if they all asked together?

A

1 hour

B

2 hours

C

3 hours

D

4 hours

E

5 hours

Why transformers connected in parallel should have same voltage ratio?

A

To avoid full load circulating current

B

To avoid no-load circulating current

C

To avoid other losses

D

To avoid all type of currents

If the percentage impedances of the two transformers working in parallel are different, then

A

transformers will be overheated

B

power factors of both the transformers will be same

C

parallel operation will be not possible

D

parallel operation will still be possible, but the power factors at which the two transformers operate will be different from the power factor of the common load

there is →ano point in losing hope →bor be worried what →chas to happen will happen →dno Error

A

a

B

b

C

c

D

d

Insurance refers to protection against an event that _________ happen whereas Assurance refers to protection against an event that _________ happen.

A

May, may not

B

Might, will

C

Must, need not

D

Will, will not

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

Two transformers operating in parallel will share the load depending upon their

A

leakage reactance

B

per unit impedance

C

efficiencies

D

ratings

For the parallel operation of single phase transformers it is necessary that they should have

A

same efficiency

B

same polarity

C

same kVA rating

D

same number of turns on the secondary side.

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

What will happen if the transformers working in parallel are not connected with regard to polarity?

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