MCQOPTIONS

Explore topic-wise MCQs in Electrical Engineering Questions.

This section includes 715 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.

651.	Curtis turbine is_____________?
A.	reaction steam turbine
B.	pressure velocity compounded steam turbine
C.	pressure compounded impulse steam turbine
D.	velocity compounded impulse steam turbine
Answer» C. pressure compounded impulse steam turbine

652.	Corona loss can be reduced by using 1. Solid conductor. 2. Hollow conductor. 3. Bundle conductor.
A.	1 only
B.	1 and 2 only
C.	1, 2 and 3 only
D.	2 and 3 only
Answer» E.

653.	Corona is observed on
A.	AC transmissions only
B.	DC transmissions only
C.	AC and DC transmissions
D.	None of these
Answer» D. None of these

654.	Conductor sag should be kept
A.	Minimum
B.	Maximum
C.	Zero
D.	None of these
Answer» B. Maximum

655.	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

656.	Combined cycle power plants are suitable for ___________.
A.	Base loads.
B.	Peak loads.
C.	Intermediate loads.
D.	Both base and peak loads.
Answer» E.

657.	Coal is processed and burnt in the combustor of a hybrid MHD at a high temperature and pressure with the preheated air to form which among the following element?
A.	Steam
B.	Plasma
C.	Coke
D.	None of these
Answer» C. Coke

658.	Carnot cycle comprises of_______?
A.	two isentropic processes and two constant volume processes
B.	two isentropic processes and two constant pressure processes
C.	two isothermal processes and three constant pressure processes
D.	none of the above
Answer» C. two isothermal processes and three constant pressure processes

659.	Capacity factor will be very low when the power plant _________________.
A.	is operated as base load plant.
B.	is operated for supplying base load as well as the peak loads.
C.	is operated in emergency only.
D.	is under maintainance.
Answer» D. is under maintainance.

660.	Capacitance between the two conductors of a single phase two wire line is 0.5 μ F/km. What is the value of capacitance of each conductor to neutral?
A.	0.5 μ F / km
B.	1 μ F / km
C.	0.25 μ F / km
D.	2.0 μ F / km
Answer» C. 0.25 μ F / km

661.	Calculate the overall efficiency of the diesel plant if the fuel consumption is 0.24 kg per kWh and the calorific value of the fuel being 10000 kcal/kg.
A.	30.78
B.	35.83
C.	28.73
D.	36.86
Answer» C. 28.73

662.	Caking coals are those which__________?
A.	burn completely
B.	burn freely
C.	do not form ash
D.	form lumps or masses of coke
Answer» E.

663.	By using which conductor is the skin effect reduced?
A.	Bundled conductors
B.	Stranded conductors
C.	Hollow conductors
D.	Solid conductors
Answer» C. Hollow conductors

664.	By increasing the transmission voltage double of its original value, the same power can be despatched keeping the line losses _______________.
A.	Equal to its original value.
B.	Half of its original value.
C.	Double the original value.
D.	One - fourth of the original value.
Answer» E.

665.	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

666.	Blowing down of boiler water is the process_____________?
A.	to reduce the boiler pressure
B.	to increase the steam temperature
C.	to control the solid concentration in the boiler water by removing some of the concentrated saline water
D.	none of the above
Answer» D. none of the above

667.	Block rate tariff, where energy charge decreases with the increase in energy consumption,
A.	Encourages the consumers for more consumption.
B.	Discourages the consumers for more consumption.
C.	Encourages the consumers to restrict their demand.
D.	Encourages the consumers to improve the power factor.
Answer» B. Discourages the consumers for more consumption.

668.	Binary’vapour cycles are used to_____________?
A.	increase the performance of the condenser
B.	increase the efficiency of the plant
C.	increase efficiency of the turbine
Answer» C. increase efficiency of the turbine

669.	Belt conveyer can be used to transport coal at inclinations upto____________?
A.	30°
B.	60°
C.	80°
D.	90°
Answer» B. 60°

670.	At what angle is the water sprayed on the insulator in 50 cycle wet test?
A.	35 °C
B.	40 °C
C.	45 °C
D.	50 °C
Answer» D. 50 °C

671.	At low value of power factor, the cost of generation of a power station will be____________?
A.	high
B.	low
C.	remain same
D.	none of the above
Answer» B. low

672.	Assertion (A): Transposition of conductors in a transmission line is necessary. Reason (R): Corona losses are reduced by transposition of conductors.
A.	Both A and R are true and R is the correct explanation of A
B.	Both A and R are true and R is not the explanation of A
C.	A is true but R is false
D.	A is false but R is true
Answer» D. A is false but R is true

673.	Assertion (A): Transmission of electrical power by dc is economical than that with ac. Reason (R): In case of dc transmission, there is no charging current which contributes to the continuous load, even on no load.
A.	Both A and R are true and R is the correct explanation of A
B.	Both A and R are true and R is not the explanation of A
C.	A is true but R is false
D.	A is false but R is true
Answer» C. A is true but R is false

674.	Assertion (A): The string efficiency can be improved by using long cross arms. Reason (R): Use of long cross arms reduces the ratio of capacity to earth to capacity per insulator thereby increasing the string efficiency.
A.	Both A and R are true and R is the correct explanation of A
B.	Both A and R are true and R is not the explanation of A
C.	A is true but R is false
D.	A is false but R is true
Answer» B. Both A and R are true and R is not the explanation of A

675.	Assertion (A): The maximum operating temperature of overhead line conductors made of aluminium or copper is restricted to 75 °C. Reason (R): conductors beyond this limit may shatter the insulator.
A.	Both A and R are true and R is the correct explanation of A
B.	Both A and R are true and R is not the explanation of A
C.	A is true but R is false
D.	A is false but R is true.
Answer» D. A is false but R is true.

676.	Assertion (A): the concept of GMD is applicable for the calculation of inductance of transmission lines. Reason (R): The radius of the conductor of transmission lines, in the expression for inductance is not the self GMD of the conductor.
A.	Both A and R are true and R is the correct explanation of A
B.	Both A and R are true and R is not the explanation of A
C.	A is true but R is false
D.	A is false but R is true
Answer» C. A is true but R is false

677.	Assertion (A): Glazing on ceramic insulators is done to make it smooth and non – absorbent. Reason (R): Moisture from atmosphere collects on the surface causing electrical breakdown.
A.	Both A and R are true and R is the correct explanation of A
B.	Both A and R are true and R is not the explanation of A
C.	A is true but R is false
D.	A is false but R is true
Answer» B. Both A and R are true and R is not the explanation of A

678.	Assertion (A): Capacitance grading improves the string efficiency not more than 220 kV. Reason (R): In capacitance grading the units used are of different capacitance and so are not interchangeable.
A.	Both A and R are true and R is the correct explanation of A
B.	Both A and R are true and R is not the explanation of A
C.	A is true but R is false
D.	A is false but R is true
Answer» E.

679.	Assertion (A): 3 wire dc distribution system is preferred over 2 wire dc distribution system. Reason (R): the 3 wire dc system of distribution is more safe.
A.	Both A and R are true and R is the correct explanation of A
B.	Both A and R are true and R is not the explanation of A
C.	A is true but R is false
D.	A is false but R is true
Answer» D. A is false but R is true

680.	Assembly of which type of insulators are used as strain type of insulators?
A.	Pin type
B.	Shackle type
C.	Suspension type
D.	None of these
Answer» D. None of these

681.	Ash handling system is mainly divided into________________ systems.
A.	Mechanical handling
B.	Pneumatic
C.	Hydraulic
D.	All of these
Answer» E.

682.	As the moisture content in the air increases, what is the effect of this on the disruptive critical voltage?
A.	Increases
B.	Decreases
C.	Remains constant
D.	May increases or decrease
Answer» C. Remains constant

683.	Artificial draught is produced by______________?
A.	induced fan
B.	forced fan
C.	induced and forced fan
D.	all of the above
Answer» E.

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

685.	Armouring is provided above the bedding. The armouring consists of one or two layers of which wire or tape?
A.	Galvanised steel wire
B.	Thin wires of copper
C.	Wires of aluminium
D.	Wire made of both copper and cadmium
Answer» B. Thin wires of copper

686.	Annual operating expenditure of a power plant consists of_________?
A.	fixed charges
B.	semi-fixed charges
C.	running charges
D.	all of the above
Answer» E.

687.	An industrial consumer has a load pattern of 2000 kW, 0.8 lag for 12 hours and 1000 kW UPF for 12 hours. What is its load factor?
A.	10.5
B.	0.75
C.	0.6
D.	2.0
Answer» C. 0.6

688.	An industrial consumer has a load pattern of 2000 kW 0.8 lag for 12 hours and 1000 kW unity power factor for 12 hours. What is the load factor?
A.	0.5
B.	0.55
C.	0.6
D.	0.75
Answer» E.

689.	Air- preheater in a steam power plant_____________.
A.	Recovers the heat from the flue gases leaving the economiser.
B.	Improves combustion rate.
C.	Raises the temperature of the furnace gases
D.	All of these.
Answer» E.

690.	Air density factor which depends on the pressure and temperature is given by which of these formulas?
A.	δ = (5.92 * b) / (273 + t)
B.	δ = (7.92 * b) / (273 + t)
C.	δ = (3.92 * b) / (273 + t)
D.	δ = (4.92 * b) / (273 + t)
Answer» D. δ = (4.92 * b) / (273 + t)

691.	Active power and apparent power are respectively represented by _________.
A.	kW and kVAR
B.	kVAR and kVA
C.	kVA and kVAR
D.	kW and kVA
Answer» E.

692.	A variable charge is based on what?
A.	Energy consumption
B.	Maximum demand
C.	Peak load demand
D.	All of the above
Answer» B. Maximum demand

693.	A uniformly loaded dc distributor is fed at both ends with equal voltages. In comparison to a similar distributor fed at one end only, what will be the drop at the midpoint be?
A.	One fourth
B.	Half
C.	One third
D.	One sixth
Answer» D. One sixth

694.	A uniformly loaded dc distributor is fed at both ends with equal voltages. In comparison to a similar distributor fed at one end only, what will be the maximum voltage drop?
A.	One fourth
B.	Half
C.	One third
D.	One sixth
Answer» B. Half

695.	A two conductor single phase line operates at 50Hz. Diameter of each conductor is 20mm and the spacing between the conductors is 3m. The height of the conductors above the ground is 6m. What is the capacitance of the line to neutral?
A.	9.7 pF/m.
B.	10.8 pF/m.
C.	3.57 pF/m.
D.	2.415 pF/m.
Answer» B. 10.8 pF/m.

696.	A transformer costing Rs 90,000 haws a useful life of 20 years. Determine the annual depreciation charge using straight line method. Assume salvage to be 15,000.
A.	4000
B.	3750
C.	4350
D.	3500
Answer» C. 4350

697.	A three wire dc distribution makes available how many voltages?
A.	One
B.	Two
C.	Three
D.	All of these
Answer» D. All of these

698.	A three phase transmission line has its conductors at the corners of an equilateral triangle with sides 3m. The diameter of each conductor is 1.63 cm. What is the inductance of the line per phase?
A.	1.232 mH
B.	1.184 mH
C.	2.236 mH
D.	2.68 mH
Answer» B. 1.184 mH

699.	A three phase, 50Hz transmission line consists of three equal conductors of radii ‘r’ placed in a horizontal plane with a spacing of 6m between middle and outer conductor. If the radius of each conductor is 12.5 mm, then inductance per phase per km of the transposed line will be
A.	1.33 mH/km
B.	1.65 mH/km
C.	0.38 mH/km
D.	2.145 mH/km
Answer» B. 1.65 mH/km

700.	A thermal generating station has a installed capacity of 15 MW and supplies a daily load of 10 Mw for 12 hours and 5 MW for remaining 12 hours. The plant capacity factor for this station is _______.
A.	1
B.	0.75
C.	0.67
D.	0.5
Answer» E.

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