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Tuesday, 20 September 2016

Electricity Overhead Lines - Multiple Choice Questions

Electricity Overhead Lines - Multiple Choice Questions Points : Electricity Overhead Lines, Electrical Overhead Lines multiple choice questions and answers, electrical objective type question answers, mcqs 1. The potential across the various discs of suspension string is different due to
(i) self-capacitance
(ii) shunt capacitance
(iii) both (i) and (ii)
(iv) none of above

2. In a string of suspension insulators, if shunt capacitance decreases, then string efficiency
(i) decreases
(ii) increases
(iii) remains the same
(iv) none of above

3. The wind pressure is directly proportional to
(i) speed of wind
(ii) square of speed of wind
(iii) square root of speed of wind
(iv) none of above

Friday, 2 September 2016

Electrical Supply System - Multiple Choice Questions

Electrical Supply System - Multiple Choice Questions Points : Electrical supply system multiple choice questions and answers, electrical objective type question answers, mcqs 1. If voltage is increased by n times, the size of the conductor would
(i) increase by n times
(ii) reduce by 1/n times
(iii) increase by n2 times
(iv) reduce by 1/n2

2. As a matter of economy, voltage for power transmission should be
(i) low
(ii) medium
(iii) high
(iv) none of above

3. In a supply system, the cost of conductor is
(i) directly proportional to area of cross-section
(ii) inversely proportional to area of cross-section
(iii) directly proportional to square of area of cross-section
(iv) none of above

Friday, 26 August 2016

Economics of Power Generation - Multiple Choice Questions

Economics of Power Generation - Multiple Choice Questions Points : Economics of Power Generation, multiple choice questions and answers, electrical objective type question answers, mcqs 1. In the diminishing value method for calculating depreciation, the annual depreciation charge is independent of
(i) useful life of equipment
(ii) scrap value
(iii) the rate of interest
(iv) initial value of equipment

2. A consumer who consumes more electrical energy should pay
(i) more fixed charges per unit
(ii) less fixed charges per unit
(iii) less running charges per unit
(iv) none of above

Thursday, 4 August 2016

Generation of Electrical Energy - Multiple Choice Questions

Generation of Electrical Energy - Multiple Choice Questions Points : Generation of Electrical Energy multiple choice questions and answers, electrical objective type question answers, mcqs 1. An alternator converts
(i) sound energy into electrical energy
(ii) mechanical energy into electrical energy
(iii) electrical energy into mechanical energy
(iv) none of above

2. The most clean power plant is
(i) steam power plant
(ii) diesel power plant
(iii) hydro-electric plant
(iv) nuclear power plant

3. Diesel power plants are used as …………. plants.
(i) base load
(ii) peak load
(iii) standby
(iv) none of above

Sunday, 17 July 2016

Synchronous Motors - Multiple Choice Questions

Synchronous Motors - Multiple Choice Questions Points : Synchronous Motors, multiple choice questions and answers, electrical objective type question answers, mcqs 1. A synchronous motor rims at speeds ranging from .............
(i) 1800 to 3600 r.p.m.
(ii) 3600 to 6000 r.p.m.
(iii) 150 to 1800 r.p.m.
(iv) none of the above

2. The rotor of a synchronous motor is excited with direct current while the motor …………..
(i) is at standstill (i.e. at starting)
(ii) approaches synchronous speed
(ii) approaches half synchronous speed
(iv) none of the above

3. A synchronous motor runs at only one speed (i. e. synchronous speed) because it ………………
(i) has no losses
(ii) is a doubly fed machine
(iii) has a damper winding
(iv) none of the above

Sunday, 3 July 2016

Alternators - Multiple Choice Questions

Alternators - Multiple Choice Questions Points : Alternators MCQs, multiple choice questions and answers, electrical objective type question answers, mcqs
  1. Majority of the alternators are

    (i)single phase
    (ii)Three phase
    (iii)Two phase
    (iv)none of the above
  2. Armature windings of an alternator are generally

    (i)closed windings
    (ii)open windings
    (iii)partly open and partly closed windings
    (iv)none of the above
  3. The salient-pole construction for field structure of an alternator is generally used for ______ machine

    (i)2-pole
    (ii)4-pole
    (iii)8-pole
    (iv)none of the above

Tuesday, 31 May 2016

Single Phase Motors - Multiple Choice Questions

Single Phase Motors - Multiple Choice Questions Points : single phase motors, multiple choice questions and answers, electrical objective type question answers, mcqs
  1. The full-load efficiency of a shaded pole motor is about ……………

    (i) 70 to 80%
    (ii) 60 to 70%
    (iii) 30 to 35%
    (iv) 5 to 10%
  2. A vacuum cleaner employs motor.

    (i) resistance split-phase
    (ii) capacitor-start
    (iii) shaded-pole motor
    (iv) single-phase series motor
  3. The direction of split-phase induction motor can be reversed by interchanging the connections of supply of ............

    (i) either main or starting winding
    (ii) both main and starting winding
    (iii) rotor winding
    (iv) none of the above

Wednesday, 9 March 2016

Three Phase Induction Motor - Multiple Choice Questions

Three Phase Induction Motor - Multiple Choice Questions Points : three phase induction motor, multiple choice questions and answers, electrical objective type question answers, mcqs 1. In a 3-phase induction motor, the rotor speed is ……… the synchronous speed.
(i) greater than
(ii) smaller than
(iii) equal to
(iv) none of the above

2. A 4-pole, 50 Hz induction motor operates at 5% slip. The frequency of e.m.f. induced in the rotor will be ..............
(i) 25Hz
(ii) 50Hz
(iii) 2.5 Hz
(iv) none of the above

3. The air-gap between stator and rotor of a 3-phase induction motor ranges from …………
(i) 2 cm to 4 cm
(ii) 0.4mm to 4 mm
(iii) 1 cm to 2 cm
(iv) 4 cm to 6 cm

Tuesday, 16 February 2016

Transformer - Multiple Choice Questions

Transformer - Multiple Choice Questions Points : transformer, multiple choice questions and answers, electrical objective type question answers, mcqs 1. A transformer is an efficient device as it …………
(i) is a static device
(ii) uses inductive coupling
(iii) uses capacitive coupling
(iv) uses electric coupling

2. A transformer does not possess …………… change property.
(i) impedance
(ii) voltage
(iii) current
(iv) power

3. The voltage per turn of the primary of a transformer is ……… the voltage per turn of secondary.
(i) more than
(ii) less than
(iii) the same as
(iv) none of the above

Sunday, 31 January 2016

D. C. Motors - Multiple Choice Questions

D. C. Motors - Multiple Choice Questions Points : direct current motor mcqs, d. c. motors multiple choice questions and answers, electrical objective type question answers, mcqs 1. When the speed of a d.c. motor increases, its armature current …………..
(i) increases
(ii) decreases
(iii) remains constantly
(iv) none of the above

2. The back e.m.f. in a d.c. motor ……………
(i) opposes the applied voltage
(ii) aids the applied voltage
(iii) aids the armature current
(iv) none of the above

3. A series motor will over speed when ……….
(i) the load is increased
(ii) the field is opened
(iii) the armature circuit is opened
(iv) load is removed

Wednesday, 20 January 2016

D. C. Generators - Multiple Choice Questions

D. C. Generators - Multiple Choice Questions Points : d. c. generators multiple choice questions and answers, electrical objective type question answers, mcqs 1. The armature of a d.c. machine is prepared …….. of
(i) silicon steel
(ii) wrought iron
(iii) cast steel
(iv) soft iron

2. A 4-pole d.c. machine has ……….. magnetic circuits.
(i) 2
(ii) 8
(iii) 4
(iv) none of the above

3. ………. d.c. machines are mainly common.
(i) 2-pole
(ii) 4-pole
(iii) 6-pole
(iv) 8-pole

Saturday, 16 January 2016

Electrical Measuring instruments - Multiple Choice Questions

Electrical Measuring instruments - Multiple Choice Questions Points : electrical measuring instruments, multiple choice questions and answers, electrical objective type question answers, mcqs 1. Permanent-magnet moving coil instrument can be use for .......
(i) a.c. work only
(ii) d.c. work only
(iii) both d.c. and a.c. work
(iv) none of above

2. In eddy current damping, disc or former is prepared of a material that is a ………….
(i) conductor but non-magnetic
(ii) conductor but magnetic
(iii) non-conductor and non-magnetic
(iv) non-conductor but magnetic

3. An ammeter is …….. instrument.
(i) an indicating
(ii) an integrating
(iii) a recording
(iv) none of the above