MCQs of Conventional Generation, Load Curves and Tariffs (Power System - I - 3140914)

Power System - I (3140914) MCQs

MCQs of Conventional Generation, Load Curves and Tariffs

Showing 141 to 150 out of 425 Questions

141.

Compounding of steam turbines is done in order to

(a)	Reduce the rotor speed
(b)	Increase the rotor speed
(c)	Balance the turbine
(d)	None of above

142.

The governing employed for medium and larger sized steam turbine is

(a)	Bypass
(b)	Nozzle
(c)	Throttle
(d)	Combination of (b) and (c)

143.

The ratio of exit pressure to inlet pressure of maximum mass flow rate per unit area of steam through a nozzle, when the steam is initially super heated is

(a)	0.650
(b)	0.578
(c)	0.545
(d)	0.532

144.

The ratio of exit pressure to inlet pressure of maximum mass flow rate per unit area of steam through a nozzle, when the steam is initially dry saturated is

(a)	0.532
(b)	0.545
(c)	0.578
(d)	0.650

145.

The effect of considering friction in steam nozzles for the same pressure ratio leads to

(a)	Increase in dryness fraction of exit steam
(b)	Decrease in exit velocity from the nozzle
(c)	No change in exit velocity from the nozzle and quality of exit steam
(d)	Both (a) and (b)

146.

The steam is super-heated to the highest economical temperature in order to

(a)	Reduce the requirement of steam for a given output of energy owing to its high internal energy and thus reduce the turbine size
(b)	Reduce the mechanical resistance to the flow of steam over turbine blades and increases the efficiency as super-heated steam is dry and so turbine blades remain dry
(c)	Avoid corrosion and pitting at the turbine blades occurring owing to steam dryness
(d)	All of above

147.

Any leakage of air into the condenser destroys the vacuum and causes

(a)	An increase in air pressure in the condenser limiting the useful heat drop in the steam turbine
(b)	Lowering of the partial pressure of the steam and of the saturation temperature along with it
(c)	Under cooling of the condensate more severe
(d)	All of above

148.

A 200 MW steam power plant will consume nearly

(a)	1,000 tonnes of coal per day
(b)	2,000 tonnes of coal per day
(c)	4,000 tonnes of coal per day
(d)	7,500 tonnes of coal per day

149.

Heating value of coal is roughly

(a)	1000 – 1500 kcal/kg
(b)	3000 – 4500 kcal/kg
(c)	5000 – 6000 kcal/ kg
(d)	7500 – 10000 kcal/kg

150.

Calorific values of coal largely depends upon

(a)	Ash content
(b)	Size of coal particles
(c)	Moisture content
(d)	Volatile matter

Showing 141 to 150 out of 425 Questions