For two non-interacting first order systems connected in series, the overall transfer function is the __________ of the individual transfer functions.

The central air conditioning system has ___________ overall efficiency as compared to individual systems.

A

Same

B

Lower

C

Higher

D

None of these

When a number of stages are connected in parallel, the overall gain is the product of the individual stage gains

A

True

B

False

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

Overall mass transfer co-efficient in case of absorption of __________ in water is based on the gas film co-efficient only, as the mass transfer process is gas film (phase) controlling.

A

CO₂

B

SO₂

C

NH₃

D

None of these

The overall resistance for heat transfer through a series of flat resistance, is the __________ of the resistances.

A

Average

B

Geometric mean

C

Product

D

Sum

Which of the systems having following transfer functions is stable?

A

$$\frac{1}{{{{\text{s}}^2} + 2}}$$

B

$$\frac{1}{{{{\text{s}}^2} - 2{\text{s}} + 3}}$$

C

$$\frac{1}{{{{\text{s}}^2} + 2{\text{s}} + 2}}$$

D

$$\frac{{{\text{exp}}\left( { - 20{\text{s}}} \right)}}{{{{\text{s}}^2} + 2{\text{s}} - 1}}$$

The concept of overall coefficient of heat transfer is used in heat transfer problems of

A

Conduction

B

Convection

C

Radiation

D

Conduction and convection

The concept of overall coefficient of heat transfer is used in case of heat transfer by

A

Conduction

B

Convection

C

Radiation

D

Conduction and convection

The rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the

A

Heating volume

B

Heat transfer area

C

Nusselt number

D

None of these

Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the

A

Maximum resistance in the series

B

Sum of all resistances

C

Average of all resistances

D

Minimum resistance presents in the series

For two non-interacting first order systems connected in series, the overall transfer function is the __________ of the individual transfer functions.

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