# Countercurrent Braking MCQ Questions & Answers

Countercurrent Braking MCQs : This section focuses on the "Countercurrent Braking". These Multiple Choice Questions (MCQs) should be practiced to improve the Countercurrent Braking skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

All loops are meshes.

A. True
B. False

Question 2

Braking resistance should be selected in order to limit the braking current.

A. True
B. False

Question 3

Calculate the bandwidth in series RLC circuit if the frequency is 20 Hz and the quality factor is 5.

A. 2 Hz
B. 4 Hz
C. 6 Hz
D. 8 Hz

Question 4

Calculate the current in DC shunt field winding using the following data: Ia=15 A, IL=21, R=22, N=484.

A. 4 A
B. 2 A
C. 7 A
D. 6 A

Question 5

Calculate the equivalent capacitance when two capacitors are connected in parallel of values 8 F, 7 F.

A. 15 F
B. 20 F
C. 40 F
D. 7 F

Question 6

Calculate the equivalent resistance when two resistances are connected in parallel of values 2 ?, 2 ?.

A. 1 ?
B. 2 ?
C. 4 ?
D. 7 ?

Question 7

Calculate the flux produced by the DC shunt field winding using the following data: Ia=5 A, IL=11, R=2, N=4.

A. 14 Wb
B. 12 Wb
C. 17 Wb
D. 18 Wb

Question 8

Calculate the quality factor for the resistor.

A. inf
B. 0
C. 1
D. 0.7

Question 9

Calculate the total energy stored in the inductor if the current value is 4 A and inductance values are 1 H and 2 H.

A. 72 J
B. 22 J
C. 82 J
D. 24 J

Question 10

Calculate the value of the inductive reactance during resonance if the value of capacitive reactance is 2 ohm.

A. 8 ?
B. 2 ?
C. 3 ?
D. 1 ?

Question 11

DC shunt motors are used where the high _________ is required.

A. Starting torque
B. Maximum torque
C. Minimum torque
D. Breakdown torque

Question 12

Full form of IFOC.

A. Indirect field oriented control
B. Inverter field oriented control
C. Isolated field oriented control
D. Insight field oriented control

Question 13

Full form of TVR is _________

A. Terminal voltage reversal
B. Total voltage reversal
C. Terminal voltage redirect
D. Total voltage reversal

Question 14

In DC shunt machine ? is directly proportional to Ia.

A. True
B. False

Question 15

Mesh analysis is only applied to the planar circuits.

A. True
B. False

Question 16

Plugging is suitable for __________ type loads.

A. Gravitational
B. Electrostatic
C. Weightless

Question 17

Selectivity value increases for lower values of bandwidths.

A. True
B. False

Question 18

The characteristics shown by an element in the I-V curve is a straight line passing through the origin with a positive slope. The nature of the element is _______

A. Non-linear, Bilateral
B. Linear, Unilateral
C. Linear, Bilateral
D. Non-linear, Unilateral

Question 19

The minimum value of the admittance in case of the parallel RLC network is ___________

A. R
B. 1÷R
C. Xl-Xc
D. Xc

Question 20

The nodal method is better than mesh analysis for solving circuit problems.

A. True
B. False

Question 21

The relationship between the torque(T) and power(P) developed in the DC shunt motor is ___________ (Neglecting all the losses)

A. T ? ?P
B. T ? P2
C. T ? ?P
D. T ? P

Question 22

The shape of the current-torque characteristics in DC shunt motor is __________

A. Rectangular Hyperbola
B. Parabola
C. Straight line
D. Ellipse

Question 23

The shape of the speed-armature current characteristics in DC shunt motor is __________

A. Hyperbolic
B. Parabola
C. Negative slope linear line
D. Ellipse

Question 24

The shape of the speed-torque characteristics in DC shunt motor is __________

A. Rectangular Hyperbolic
B. Whole x-y plane
C. Circle
D. Ellipse

Question 25

The value of current at time of starting is ___________

A. High
B. Low
C. Very low
D. 0

Question 26

The value of impulse at t=0 is __________

A. 0
B. 2
C. 1
D. infinite

Question 27

The value of unit step function at t=5 sec is ________

A. 0
B. 1
C. -1
D. 2

Question 28

Torque developed in the motor is ___________

A. Km?Ia
B. Km?Ia3
C. 2Km?Ia
D. Km?Ia2

Question 29

Calculate the current in DC shunt field winding using the following data: Ia=15 A, IL=21, R=22, N=484.

A. 4:00 AM
B. 2:00 AM
C. 7:00 AM
D. 6:00 AM

Question 30

Calculate the equivalent resistance when two resistances are connected in parallel of values 2 Ω, 2 Ω.

A. 1 Ω
B. 2 Ω
C. 4 Ω
D. 7 Ω

Question 31

Calculate the value of the inductive reactance during resonance if the value of capacitive reactance is 2 ohm.

A. 8 Ω
B. 2 Ω
C. 3 Ω
D. 1 Ω

Question 32

In DC shunt machine ∅ is directly proportional to Ia.

A. TRUE
B. FALSE

Question 33

The relationship between the torque(T) and power(P) developed in the DC shunt motor is ___________ (Neglecting all the losses)

A. T ∝ √P
B. T ∝ P2
C. T ∝ ∛P
D. T ∝ P