Homework Help for Engineering

 For low head and high discharge the hydraulic turbine used is.

a. Kaplan

b. Francis type

c. Pelton wheel

d. Jonvas

In steam turbine cycle, the lowest pressure occurs in

a. Turbine inlet

b. Boiler

c. Condenser

d. Superheater

Which of the following contributes to the efficiency of Rankine cycle in thermal power plant.

a. Used of high pressure

b.  Reheating of steam at intermediate stag

c.  Regeneration use of steam for heating boiler

d.  All of these

Power plant using coal work closely on which of the following cycle

a. Rankine cycle

b. Binary vapour cycle

c. Otto cycle

d. Brayton cycle

Heating value of coal largely depend on

a. ash content

b. moisture content

c. volatile matter

d. size of coal particle

Subsynchronous resonance is a condition that may occu on

a.  Short transmission line

b.  Long, heavily loaded line

c.  Loss of load on transmission line

d.  Increase of load on line

 Ferroresonance is a condition that may occur on

a. Distribution line

b. Capacitor

c. Transformer

d. Transmission line

Spinning reserve is generating capacity that

a.  Is available by starting Gas- Turbine generating units

b.  Is synchronized and online, with capacity in excess of existing load

c.  Has the lowest fuel cost

d.  A policy matter

 Inadverent accumulations between power systems are normally balanced by scheduling compensating deliveries of power

a.  During off-peak load

b.  During periods corresponding to those in which the inadverent energy was accumulated

c. On weekends

d.  On base load plant

 The most economical cross section of a conductor is that which makes the interest on the capital outlay plus depreciation due to the conductor in the cable equal to the annual cost of energy loss.

a. Ferranti law

b. Kelvins law

c. Mc Kevins Law

d. Vanderwhaals Law

One advantage of computer control of generating units is that

a.  Var. output of the units are minimized

b.  All units under the control of the computer will be loaded to the same load

c.  Loading of the units will be frequently adjusted to maintain them at equal incremental cost

d.  It can control all equipment

The power customer has four circuits of220-volt three phase. The circuits have the maximum demand as follows:

Circuit no 1  = 35 Amperes    Circuit no 3 = 72 Amperes

Circuit no 2  = 46 Amperes    Circuit no 4 = 57 Amperes

The diversity factor is 1.5, the load factor is 50% and the power factor is 80%. Determine the maximum KVA demand of the customer?

a. 46

b. 80

c. 26.5

d. 53

The power customer has four circuits of220-volt three phase. The circuits have the maximum demand as follows:

Circuit no 1 = 35 Amperes    Circuit no 3 = 72 Amperes

Circuit no 2 = 46 Amperes    Circuit no 4 = 57 Amperes

The diversity factor is 1.5, the load factor is50% and the power factor is 80%. What is the approximate kW demand of the customer?

a. 15 kW

b. 21 kW

c. 43 kW

d. 53 kW

The metering of a power customer was read and gave the following data:

KW-hr = 200,000  KVAR- hr.= 180,000  Maximum demand = 380 kW  Billing days = 3

What is the load factor?

a. 68%

b. 80%

c. 73%

d. 62%