# Hero Electric - Isieindia - Klu Joint Industry Project

60 Questions | Total Attempts: 124  Settings Create your own Quiz • 1.
For satellite the source of energy is........
• A.

Cryogenic storage

• B.

Battery

• C.

Solar cell

• D.

Any of the abov

• 2.
The output of solar cell is of the order of........
• A.

1 W

• B.

5 W

• C.

10 W

• D.

15 W

• 3.
Gain of an amplifier = 400, input signal to an amplifier = 0.5 cos (313 t). The output signal is represented as
• A.

20 sin (403 t)

• B.

20 cos (403 t)

• C.

400 cos (313 t)

• D.

400 cos (313 t + 90°)

• 4.
Microwave energies propagate the length of the waveguide by __________ its side walls.
• A.

Refraction off

• B.

Reflection off

• C.

Moving off

• D.

None of the above

• 5.
Two entities that are combined to form a Magic Tee ar
• A.

One H? and two E plane tees

• B.

One H? and one E plane tee

• C.

Two H? and two plane tees

• D.

Two H? and one E plane tee

• 6.
Consider reciprocal of capacitance and torsional spring stiffness as analogous quantities. The system is considered as
• A.

Torque - voltage

• B.

Torque - current

• C.

Force - voltage

• D.

Force - current

• 7.
Under mechanical rotational system and electrical system the quantities that are not analogous are
• A.

Angular velocity and current

• B.

Angular displacement and charge

• C.

Viscous friction and coefficient resistance

• D.

Moment of inertia and conductance

• 8.
An ideal current source has zero
• A.

Internal resistance

• B.

Internal conductance

• C.

Ripple

• D.

Voltage on the load

• 9.
To carry a current of 0.3 amperes, a 100 ohm resistor is needed in an electric circuit. A resistor you would select is
• A.

100 ohm, 7.5 watts

• B.

100 ohm, 10 watts

• C.

100 ohm, 1 watt

• D.

100 ohm, 5 watts

• 10.
Let T be the time period of a periodic signal x (t) and for some time “t?” let y (t) = x (t - to) + x (t + to). Let b denotes the Fourier series coefficients of y (t). For all odd values of k if b? = 0 then “to” can be equal to
• A.

T/2

• B.

2T

• C.

T

• D.

T/4

• 11.
To limit the armature current to 125% of its rated value, the external resistance to be added in the armature circuit is
• A.

6.4 Ω

• B.

10.6 Ω

• C.

16.2 Ω

• D.

31.1 Ω

• 12.
A 3-phase synchronous motor is connected to an ac main. The motor runs at full load and unity power factor. With field current held constant if its shaft load is reduced by half, its new power factor will be
• A.

Unity

• B.

Lagging

• C.

• D.

Dependent on machine parameters.

• 13.
The vertical distance between the axis of the beam before and after loading at a point is called as
• A.

Deformation

• B.

Deflection

• C.

Slope

• D.

None of the above

• 14.
The wind intensity can be described by
• A.

Reynolds number

• B.

Mach number

• C.

Beaufort number

• D.

Froude number

• 15.
The PWM control of DC motor varies
• A.

Linearly with speed

• B.

Inversely with speed

• C.

Parabolically with speed

• D.

Exponentially with speed

• 16.
Ward-Leonard system of system of speed control is not recommended for
• A.

Constant speed operation

• B.

Wide speed

• C.

Frequent-motor reversed

• D.

Very slow speed

• 17.
Mark the wrong option. Which of the following cause and effect behaviour in speed control is correct when field resistance is increased.
• A.

Decrease in flux

• B.

Decrease in flux

• C.

Increase in EMF

• D.

Decrease in speed

• 18.
Small DC motors have best speed control by
• A.

Armature voltage control

• B.

Field resistance control

• C.

Any of the methods

• D.

None of the mentioned

• 19.
The short circuit load losses is/are
• A.

Direct load loss and stray load losses

• B.

• C.

• D.

Field current loss

• 20.
The coupling angle or load angle of a synchronous motor is defined as the space angle between
• A.

Rotor and stator poles of opposite polarity

• B.

Rotor and stator poles of same polarity

• C.

Rotor and stator teeth

• D.

Rotor and resultant magnetic field

• 21.
Synchronizing power is (i) Stiffness coefficient of electromagnetic coupling between stator and rotor (ii) Stability measure of synchronous machine (iii) Power consumption factor
• A.

I,ii

• B.

Ii, iii

• C.

Iii, i

• D.

I , ii, iii

• 22.
Large stiffness coefficient represents
• A.

Motor speed remains practically constant

• B.

Large fluctuations due to mechanical load

• C.

Motor speed is variable to changes

• D.

No such significance with speed

• 23.
Consider the below remarks for an alternator (i) An over excited machine is more stiff (ii) Machine with longer air-gap is less stable than one with smaller air-gap
• A.

(i) is True, (ii) is False

• B.

(i) is False, (ii) is True

• C.

(i) is True, (ii) is True

• D.

(i) is False, (ii) is False

• 24.
Which of the following is/are used in synchronous machines to maintain mechanical stability?
• A.

Damper winding

• B.

Interpole winding

• C.

Compensating winding

• D.

Equalizer rings

• 25.
Electromagnetic torque is present in rotating machines when
• A.

Both stator and rotor windings carry current

• B.

Rotor windings carry current

• C.

Stator windings carry current

• D.

Any of the mentioned

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