ELECTRICAL 70 IMPORTANT MCQ PDF FOR VIZAG MT & MPVYAPAM SUB ENGINEER EXAM 2017

a) 1.602 * 10-19 C.

 b) 1.602 * 10-19 μC.

c) 9.107 * 10-31 C.

d) 9.107* 10-25 C.

a) mV joules
b) m  eV joules

c) eV joules
d) m/e  joules

a) magnitude remains constant with time

b) magnitude changes with time

c) direction changes with time

d) magnitude and direction changes with time

a) magnitude only
b) direction only

c) both magnitude and direction

d) none

a) conversion of heat
b) conversion of light

c) electro-magnetic induction

d) conversion of chemical energy

a) Fleming’s left hand rule

b) Fleming’s right hand rule

c) Lenz’s law
d) none of the above

a) level of the voltage
b) the power level

c) the power factor
d)  the frequency

a) to step-up the voltage
b) to step-down the voltage

c) on d.c

d) to step-up or step-down the voltage

a) a gas

b) vaccum

c) a semi-conductor

d) a gas, semi-conductor or vaccum

a) vaccum diode
b) Zener diode

c) inductor
d) SCR

a) solar
b) radio-active substances

c) geothermal

d) wind

a) intermittency
b) lack of dependability

c) availability in low energy densities

d) all the abaove

a) generating station to a switching station / step down transformer station.

b) step down transformer station to service transformer banks

c) distribution transformer to consumer premises

d) service points to consumer premises

a) primary distribution
b) secondary distribution

c) primary transmission
d) secondary transmission

a) electric motor and the transmission system

b) electric motor ,the transmission and control system

c) the transmission and control system

d) electric motor and conversion equipment

a) it is cumbersome drive

b) it is costlier in intial as well as in maintenance cost

c) electric power supply failure makes the drive standstill

d) all of the above.

a) length and time

b) length and mass

c) velocity
d) either a or c

a) electro-dynamometer method

b) tangent galvanometer method

c) Rayleigh current balance method

d) Lorenz method

a) open loop system

b) closed loop system

c) unstable system

d) none of the above

a) depends on the input signal

b) is independent of the desired output

c) depends on system variables

d) depends on system size

a) electrons.

b) protons.

c) electrons and ions.

d) charged particles.

a) random movement of electrons in a conductor

b) movement of free electrons predominately in one direction

c) pressure difference between two poles

d) the power that causes drift of electrons.

a) is from positive to negative.

b) is always in one direction.

c) varies from instant to instant.

d) cannot be determined.

a) ac.
b) dc.

c) pulsating.
d) none

a) Amplifier.
b)Battery charger.

c) Transformer.

d) Electric bell.

a) dc generator
b) dc motor

c) alternator
d) Transformer

a) voltage
b) current

c) frequency
d)  turns

a) greater than that of primary
b) equal to that of primary

c) less than that of primary
d) none

a) zener diode

b) triode

c) pentode

d) thyratron

a) mica capacitor
b) ceramic capacitor

c)electrolytic capacitor

d) paper capacitor

a) wind
b) tidal

c) geothermal

d) solor

a) diesel
b) Hydro-electric

c) steam
d) tidal

a) 6.6 KV

b) 11 KV

c) 12.5 KV

d) 13.2 KV

a) 750 KV
b) 400 KV

c) 220 KV
d) 132 KV

a) electric excavators  steel mills and cranes

b) lathes and machine tools

c) flour mills and jaw crushers

d) paper industry

a) motor-generator set

b) mercury arc rectifier

c) silicon diodes

d) any of the above.

a) are forward biased

b) are reverse biased

c) cover a wide range of current
d) operate in breakdown strength

e) all of above except (a)

a) low resistivity

b) high resistivity and low temperature co-efficient

c) high temp co-efficient

d) low resistivity and high temperature co-efficient

a) feedback and controlled system

b) controller and controlled system

c) controlled system and servo system

d) feed back element and controlled system and controller

a) feedback

b) servomechanism

c) actuating signal

d) error signal

41.Speed of the stator field of an Induction motor is
(a) Synchronous speed
(b) Any speed
(c) Less than Synchronous
(d) Slip Speed

42.Difference in speed between stator field and rotor
(a) Full load speed
(b)No load speed
(c)Slip
(d) Regulation

43.Frequency of current in rotor
(a)Supply frequency
(b)Less than supply frequency
(c)Greater than supply frequency
(d)Slip frequency

44. Shape of the torque slip curve is
(a) Rectangular Hyperbola
(b)Parabola
(c)Sine
(d) Cosine

45.Machine with negative slip
(a)Induction Motor
(b) Brake
(c)Induction Generator
(d)Synchronous machine

46.When rotor is at standstill
(a)slip is zero
(b)slip is one
(c)Any slip
(d)Slip is infinity

47.When the motor runs at synchronous speed slip is
(a) One
(b) Infinity
(c)Zero
(d)Two

48.Which torque is greater
(a)Break down
(b)Full load
(c) No load
(d) Running

49.An Induction motor is analogous to
(a)DC motor
(b)Transformer
(c)Synchronous motor
(d) DC Generator

50.Blocked rotor test is analogous to
(a) SC test
(b)OC test
(c)Swinburnes
(d) Load test

51.No load test is analogous to
(a) SC test
(b) Load test
(c)OC test
(d)Swinburnes test

52.Rotor Copper loss is equal to
(a)Friction loss
(b)Stator loss
(c)slip times rotor input
(d)rotational loss

53.For the purpose of plugging
(a)N is positive w.r.t to Ns
(b)N is zero
(c)N is infinity
(d)N is negative w.r.t to Ns

54.Parameter from no load test is
(a)Ri and Xi
(b)Ro and Xo
(c) Copper loss
(d)Impedance

55.If stator field is rotating in clockwise direction rotor rotates in
(a) Any direction
(b)Cannot predict
(c)Anticlockwise
(d) clockwise

66.Blocked rotor test is conducted at
(a)High voltage
(b)Rated current
(c)High current
(d)Rated voltage

67.Speed of rotor field in space
(a)N
(b)Any speed
(c)Ns
(d)Slip speed

68.Line joining tangent and output line in a circle diagram gives
(a)Cu loss
(b)Stator loss
(c)Maximum output
(d)Maximum Torque

69..Line joining tangent and Torque line in a circle diagram gives
(a)Cu loss
(b)Stator loss
(c)Maximum output
(d)Maximum Torque

70.No load test is conducted at
(a)High voltage
(b)Rated current
(c)High current
(d)Rated voltage

Ans: (d)Rated voltage