The purpose of RC or transformer coupling is to ___________

A machine started malfunctioning due to some issues with the coupling. The coupling emplaced in the machine was Oldham. The only coupling available in the workshop is Hooke’s coupling. So Oldham coupling can be replaced by Hooke’s coupling.

A

True

B

False

In a two-electron atomic system having orbital and spin angular momenta $${l_1}{l_2}$$ and $${s_1}{s_2}$$ respectively, the coupling strengths are defined as $${\Gamma _{{l_1}{l_2}}},\,{\Gamma _{{s_1}{s_2}}},\,{\Gamma _{{l_1}{s_1}}},\,{\Gamma _{{l_2}{s_2}}},\,{\Gamma _{{l_1}{l_2}}}$$ and $${\Gamma _{{l_2}{s_1}}}.$$ For the jj coupling. scheme to be applicable, the coupling strengths must satisfy the condition

A

$${\Gamma _{{l_1}{l_2}}},\,{\Gamma _{{s_1}{s_2}}} > {\Gamma _{{l_1}{s_1}}},\,{\Gamma _{{l_2}{s_2}}}$$

B

$${\Gamma _{{l_1}{s_1}}},\,{\Gamma _{{l_2}{s_2}}} > {\Gamma _{{l_1}{l_2}}},\,{\Gamma _{{s_1}{s_2}}}$$

C

$${\Gamma _{{l_1}{s_2}}},\,{\Gamma _{{l_2}{s_1}}} > {\Gamma _{{l_1}{l_2}}},\,{\Gamma _{{s_1}{s_2}}}$$

D

$${\Gamma _{{l_1}{s_2}}},\,{\Gamma _{{l_2}{s_1}}} > {\Gamma _{{l_1}{s_1}}},\,{\Gamma _{{l_2}{s_2}}}$$

A 100 VA, 120/12 V transformer is to be connected so as to form a step-up transformer. A Primary voltage of 120 V is applied to the transformer. What is the secondary voltage of the transformer?

A

1.2 V

B

12 V

C

120 V

D

132 V

A three phase transformer has a name plate details of 30 MVA and voltage rating of 230Y kV/69∆ kV with a leakage reactance of 10% and the transformer connection via wye-delta. Taking a base of 230 kV on the high voltage side, the transformer reactance on the LV side is ___________

A

176.33 Ω

B

1763.3 Ω

C

47.6 Ω

D

15.87 Ω

Power amplifiers generally use transformer coupling because transformer per-mits

A

Cooling of the circuit

B

Impedance matching

C

Distortionless output

D

Good frequency response

The Power amplifiers generally use transformer coupling because the transformer permits ________

A

Cooling of the circuit

B

Impedance Matching

C

Distortion less Output

D

Good Frequency Response

In an RC coupling scheme, the coupling capacitor CC must be large enough ___________

A

To pass d.c. between the stages

B

Not to attenuate the low frequencies

C

To dissipate high power

D

None of the above

In RC coupling, the value of coupling capacitor is about ___________

A

100 pF

B

0.1 µF

C

0.01 µF

D

10 µF

The most costly coupling is ___________ coupling

A

RC

B

Direct

C

Impedance

D

Transformer

What is the purpose of RC or transformer coupling?

A

To block a.c.

B

To separate bias of one stage from another

C

Increase thermal stability

D

Increase Efficiency

The purpose of RC or transformer coupling is to ___________

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