Normally, which of the following is used, when a large-scale conversion from AC. to D.C. power is required?

Pick out the wrong conversion formula for the conversion of weight units :

A

1 tonne = 1000 kg = 22.046 lbs

B

1 U.S. ton = 907 kg = 0.907 tonne = 0.893 ton

C

1 ton = 2240 lbs = 1016 kg = 1.016 tonnes = 1.12 U.S. tons

D

None of these

In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that

A

Compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller

B

Maintaining vacuum on tube side is more difficult than that on the shell side

C

Water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam

D

Condenser can act as a storage unit for condensed steam

Gas turbines for power generation are normally used

A

To supply base load requirements

B

To supply peak load requirements

C

To enable start thermal power plant

D

In emergency

The ratio of the indicated power to the shaft power or brake power of the motor or engine required to drive the compressor, is called

A

Compressor efficiency

B

Volumetric efficiency

C

Isothermal efficiency

D

Mechanical efficiency

Coenzymes required for the conversion of pyruvate to acetyl-CoA are

A

Thiamine pyrophosphate

B

CoA

C

FAD

D

Biotin

E

Pyridoxal phosphate

What is the element required for solar energy conversion ?

A

Beryllium

B

Tantalum

C

Silicon

D

Ultra pure carbon

Direct conversion of heat into electric power is possible through

A

fuel cell

B

batteries

C

thermionic converter

D

all of the above

A constant load power means a uniform conversion of

A

Mechanical to electrical energy

B

Electrical to mechanical energy

C

Current to voltage

D

Voltage to current

For crane travel which of the following motors is normally used?

A

Synchronous motor

B

D.C. differentially compound motor

C

Ward-Leonard controlled D.shunt motor

D

AC. slip ring motor

Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation?

A

Cost

B

Availability

C

Toxicity

D

Selectivity

Normally, which of the following is used, when a large-scale conversion from AC. to D.C. power is required?

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