Explore topic-wise MCQs in Electrical Engineering Questions.

This section includes 302 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.

151.

The fuel used in nuclear reactor is_____________?
A. radium
B. cadmium
C. uranium
D. all of the above
Answer» D. all of the above
Discussion
152.

In thermal power plant, heat from the flue gases is utilized in___________?
A. super heater
B. condenser
C. economizer
D. chimney
Answer» D. chimney
Discussion
153.

Demand factor is defined as___________?
A. average load/maximum load
B. maximum demand/connected load
C. connected load/maximum demand
D. average load x maximum load
Answer» C. connected load/maximum demand
Discussion
154.

One kilowatt hour is equal to_________?
A. 532 k cal
B. 735 k cal
C. 746 k cal
D. 860 k cal
Answer» E.
Discussion
155.

Which of the following power plant has highest Depreciation charges?
A. Thermal plant
B. Diesel plant
C. Hydroelectric plant
D. All have same
Answer» B. Diesel plant
Discussion
156.

Which of the following power plant has least fuel transportation______________?
A. nuclear power plants
B. diesel generating plants
C. thermal power plants
D. steam power stations
Answer» B. diesel generating plants
Discussion
157.

Load curve is useful in deciding the__________?
A. operating schedule of generating units
B. sizes of generating units
C. total installed capacity of the plant
D. all of the above
Answer» E.
Discussion
158.

If the load factor of a power station is high then its cost of generation will be_______?
A. High
B. Low
C. Remain same
D. Depend upon plant type
Answer» B. Low
Discussion
159.

What does the area under the load curve represent?
A. System voltage
B. Current
C. Energy consumed
D. Maximum demand
Answer» D. Maximum demand
Discussion
160.

Compounding of steam turbine is done for_______________?
A. reducing the work done
B. increasing the rotor speed
C. reducing the rotor speed
D. balancing the turbine
Answer» D. balancing the turbine
Discussion
161.

Steam pressure in a steam power station, which is usually kept now-a-days is of the order of____________?
A. 20 kgf/cm2
B. 50 kgf/cm2
C. 100 kgf/cm2
D. 150 kgf/cm2
Answer» E.
Discussion
162.

Example of overfeed type stoker is___________?
A. chain grate
B. spreader
C. travelling grate
D. all of the above
Answer» E.
Discussion
163.

The amount of air which is supplied for complete combustion is called___________?
A. primary air
B. secondary air
C. tertiary air
Answer» C. tertiary air
Discussion
164.

In _________ system fuel from a central pulverizing unit is delivered to a bunker and then to the various burners?
A. unit
B. central
C. none of the above
Answer» C. none of the above
Discussion
165.

Under-feed stokers work best for _________ coals high in volatile matter and with caking tendency?
A. anthracite
B. lignite
C. semibituminous and bituminous
Answer» D.
Discussion
166.

Bucket elevators are used for___________?
A. carrying coal in horizontal direction
B. carrying coal in vertical direction
C. carrying coal in any direction
Answer» C. carrying coal in any direction
Discussion
167.

The capacity of large turbo-generators varies from___________?
A. 20 to 100 MW
B. 50 to 300 MW
C. 70 to 400 MW
D. 100 to 650 MW
Answer» C. 70 to 400 MW
Discussion
168.

Method which is commonly applied for unloading the coal for small power plant is___________?
A. lift trucks
B. coal accelerators
C. tower cranes
D. belt conveyor
Answer» C. tower cranes
Discussion
169.

Load center in a power station is___________?
A. center of coal fields
B. center of maximum load of equipments
C. center of gravity of electrical system
Answer» D.
Discussion
170.

Economisers improve boiler efficiency by__________?
A. 1 to 5%
B. 4 to 10%
C. 10 to 12%
Answer» C. 10 to 12%
Discussion
171.

In a steam power plant, the function of a condenser is__________?
A. to maintain pressure below atmospheric to increase work output from the primemover
B. to receive large volumes of steam exhausted from steam prime mover
C. to condense large volumes of steam to water which may be used again in boiler
D. all of the above
Answer» E.
Discussion
172.

The efficiency of a modern boiler using coal and heat recovery equipment is about_____________?
A. 25 to 30%
B. 40 to 50%
C. 65 to 70%
D. 85 to 90%
Answer» E.
Discussion
173.

In a regenerative surface condenser_____________?
A. there is one pump to remove air and condensate
B. there are two pumps to remove air and condensate
C. there are three pumps to remove air, vapour and condensate
D. there is no pump, the condensate gets removed by gravity
Answer» C. there are three pumps to remove air, vapour and condensate
Discussion
174.

Pipes carrying steam are generally made up of_____________?
A. steel
B. cast iron
C. copper
D. aluminium
Answer» B. cast iron
Discussion
175.

The critical pressure ratio of a convergent nozzle is defined as_____________?
A. the ratio of outlet pressure to inlet pressure of nozzle
B. the ratio of inlet pressure to outlet pressure of nozzle
C. the ratio of outlet pressure to inlet pressure only when mass flow rate per unit area is minimum
D. the ratio of outlet pressure to inlet pressure only when mass flow rate = c
Answer» E.
Discussion
176.

The cooling section in the surface condenser__________?
A. increases the quantity of vapour extracted along with air
B. reduces the quantity of vapour extracted along with air
C. does not affect vapour quantity extracted but reduces pump capacity of air extraction pump
D. none of the above
Answer» C. does not affect vapour quantity extracted but reduces pump capacity of air extraction pump
Discussion
177.

Edward’s air pump____________?
A. removes air and also vapour from condenser
B. removes only air from condenser
C. removes only un-condensed vapour from condenser
D. removes air alongwith vapour and also the condensed water from condenser
Answer» E.
Discussion
178.

Reheat factor in steam turbines depends on______________?
A. exit pressure only
B. stage efficiency only
C. initial pressures and temperature only
D. all of the above
Answer» D. all of the above
Discussion
179.

Parson’s turbine is___________?
A. pressure compounded steam turbine
B. simple single wheel, impulse steam turbine
C. simple single wheel reaction steam turbine
D. multi wheel reaction steam turbine
Answer» E.
Discussion
180.

For Parson’s reaction steam turbine, degree of reaction is____________?
A. 75%
B. 100%
C. 50%
D. 60%
Answer» D. 60%
Discussion
181.

The effect of considering friction losses in steam nozzle for the same pressure ratio leads to________?
A. increase in exit velocity from the nozzle
B. decrease in exit velocity from the nozzle
C. no change in exit velocity from the nozzle
D. increase or decrease depending upon the exit quality of steam
Answer» C. no change in exit velocity from the nozzle
Discussion
182.

In case of impulse steam turbine_____________?
A. there is enthalpy drop in fixed and moving blades
B. there is enthalpy drop only in moving blades
C. there is enthalpy drop in nozzles
D. none of the above
Answer» D. none of the above
Discussion
183.

The gas turbine power plant mainly uses which among the following fuels?
A. Coal and Peat
B. Kerosene oil and diesel oil and residual oil
C. Gas oil
D. Natural gas and liquid petroleum fuel
Answer» E.
Discussion
184.

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 dryness fraction of exit steam
C. no change in the quality of exit steam
D. decrease or increase of dryness fraction of exit steam depending upon inlet quality
Answer» B. decrease in dryness fraction of exit steam
Discussion
185.

Artificial draught is produced by____________?
A. air fans
B. steam jet
C. fan or steam jet
D. all of the above
Answer» E.
Discussion
186.

The isentropic expansion of steam through nozzle for the steam initially dry saturated at inlet is approximated by equation?
A. pv = C
B. pv1A = C
C. pv1i = C
D. pv
Answer» E.
Discussion
187.

For the same draught produced the power of induced draught fan as compared to forced draught fan is___________?
A. less
B. more
C. same
D. not predictable
Answer» C. same
Discussion
188.

The artificial draught normally is designed to produce____________?
A. less smoke
B. more draught
C. less chimney gas temperature
D. all of the above
Answer» E.
Discussion
189.

The efficiency of chimney is approximately______________?
A. 80%
B. 40%
C. 20%
D. 0.25%
Answer» E.
Discussion
190.

The isentropic expansion of steam through nozzle for the steam initially superheated at inlet is approximated by equation__________?
A. pvls=C
B. pv1126 = C
C. pv1A = C
D. pv = C
Answer» B. pv1126 = C
Discussion
191.

For the induced draught the fan is located_______________?
A. near bottom of chimney
B. near bottom of furnace
C. at the top of the chimney
D. anywhere permissible
Answer» B. near bottom of furnace
Discussion
192.

The pressure at the furnace is minimum in case of___________?
A. forced draught system
B. induced draught system
C. balanced draught system
D. natural draught system
Answer» D. natural draught system
Discussion
193.

Rankine efficiency of a steam power plant____________?
A. improves in summer as compared to that in winter
B. improves in winter as compared to that in summer
C. is unaffected by climatic conditions
D. none of the above
Answer» C. is unaffected by climatic conditions
Discussion
194.

The draught in locomotive boilers is produced by_____________?
A. forced fan
B. chimney
C. steam jet
D. only motion of locomotive
Answer» D. only motion of locomotive
Discussion
195.

The overall efficiency of thermal power plant is equal to____________?
A. Rankine cycle efficiency
B. Carnot cycle efficiency
C. Regenerative cycle efficiency
D. Boiler efficiency x turbine efficiency x generator efficiency
Answer» D. Boiler efficiency x turbine efficiency x generator efficiency
Discussion
196.

The energy radiated by sun on a bright sunny day is approximately______________?
A. 700 W/m2
B. 800 W/m2
C. 1 kW/m2
D. 2 kW/m2
Answer» D. 2 kW/m2
Discussion
197.

Which among these are used to improve the efficiency of gas turbines?
A. Regenerator.
B. Inter cooling.
C. Reheating.
D. All of these
Answer» E.
Discussion
198.

Rankine cycle operating on low pressure limit of p1 an 1 high pressure limit of p2__________?
A. has higher the renal efficiency than the carnot cycle operating between same pressure limits
B. has lower the”nal efficiency than carnot cycle operating between same pressure limit?
C. has same thermal efficiency as carnot cycle operating between same pressure limits
D. may be more or less depending upon the magnitude of p1 and p2
Answer» B. has lower the”nal efficiency than carnot cycle operating between same pressure limit?
Discussion
199.

Reheat cycle in steam power plant is used to________________?
A. utilise heat of flue gases
B. increase thermal efficiency
C. improve condenser performance
D. reduce loss of heat
Answer» C. improve condenser performance
Discussion
200.

Rankine cycle efficiency of a good steam power plant may be in the range of____________?
A. 15 to 20 per cent
B. 35 to 45 per cent
C. 70 to 80 per cent
D. 90 to 95 per ceut
Answer» C. 70 to 80 per cent
Discussion