Transformer coupling is generally employed when load resistance is

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

___________ coupling is generally employed in power amplifiers

A

Transformer

B

RC

C

direct

D

Impedance

A contractor employed 30 men to do a piece of work in 38 days. After 25 days , he employed 5 men more and the work was finished one day earlier. How many days he would have been behind, if he had not employed additional men?

A

1

B

114

C

134

D

112

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

In a single stage transistor amplifier, RC and RL represent collector resistance and load resistance respectively. The transistor sees a d.c. load of ___________

A

RC + RL

B

RC || RL

C

RL

D

RC

If RC and RL represent the collector resistance and load resistance respectively in a single stage transistor amplifier, then a.c. load is

A

RL + RC

B

RC || RL

C

RL - RC

D

RC

“Maximum power output is obtained from a network when the load resistance is equal to the output resistance of the network as seen terminals of the load”. The above statement is associated with

A

Millman’s theorem

B

Thevenin’s theorem

C

Superposition theorem

D

Maximum power transfer theorem

In an amplifier, the coupling capacitors are employed for

A

Limiting the bandwidth

B

Matching the impedance

C

Preventing of Dc mixing with input or output

D

Controlling the output

Transformer coupling is generally employed when load resistance is

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