DC Shunt Motors MCQ Questions & Answers

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

Question 1

20 V, 10 A, 10 rpm separately excited dc motor with armature resistance (Ra) equal to .8 ohms. Calculate back emf developed in the motor when it operates on the full load. (Assume rotational losses are neglected)

A. 12 V

B. 14 V

C. 13 V

D. 11 V

Question 2

A circuit consists of 3 F capacitor and 5 H inductor. Determine the order of the circuit.

A. 2

B. 1

C. 3

D. 0

Question 3

Calculate the equivalent resistance when two armature resistances are connected in parallel of values 6 ?, 3 ?.

A. 3 ?

B. 2 ?

C. 4 ?

D. 7 ?

Question 4

Calculate the equivalent resistance when two resistances are connected in parallel of values 8 ?, 8 ?.

A. 3 ?

B. 2 ?

C. 4 ?

D. 7 ?

Question 5

Calculate the quality factor for the R-C circuit if R=1 ? and C=1 F.

A. 2

B. 4

C. 1

D. 5

Question 6

Calculate the quality factor for the R-C circuit if R=2 ? and C=1 F.

A. 0.2

B. 0.4

C. 0.6

D. 0.5

Question 7

Calculate the quality factor for the R-L circuit if R=16 ? and XL=8 ? with supply frequency is 1 rad/sec.

A. 2

B. 6

C. 0

D. 7

Question 8

Calculate the quality factor for the R-L circuit if R=28 ? and L=2 H.

A. 14

B. 16

C. 10

D. 17

Question 9

Calculate the resonant frequency if the values of the capacitor and inductor are 2 F and 2 H.

A. .5 rad/sec

B. .6 rad/sec

C. .8 rad/sec

D. .9 rad/sec

Question 10

Calculate the steady state value for x(t)=4(1-e-3t).

A. 5

B. 4

C. 3

D. 2

Question 11

Calculate the value of equivalent inductance for series aiding of two coils whose self inductances are 5 H, 2 H, and mutual inductance value is 4 H.

A. 15 H

B. 12 H

C. 13 H

D. 11 H

Question 12

Calculate the value of equivalent inductance for series subtracting polarity of two coils whose self inductances are 14 H, 5 H, and mutual inductance value is 1 H.

A. 15 H

B. 17 H

C. 12 H

D. 10 H

Question 13

Calculate the value of the angular acceleration of the DC shunt motor using the given data: J = 1 kg-m2, load torque = 1 N-m, motor torque = 2 N-m.

A. 1 rad/s2

B. 2 rad/s2

C. 3 rad/s2

D. 5 rad/s2

Question 14

Calculate the value of the capacitive reactance during resonance if the value of the inductor is 5 H and supply frequency is 20 rad/sec.

A. 100 ?

B. 200 ?

C. 300 ?

D. 700 ?

Question 15

Calculate the value of the coefficient of coupling for the isolated coils.

A. 0

B. 1

C. 5

D. 7

Question 16

Calculate the value of the coefficient of coupling for the tightly coupled coils.

A. 0

B. 1

C. 3

D. 2

Question 17

Full form of DTC.

A. Direct torque control

B. Digital torque control

C. Discrete torque control

D. Distribution torque control

Question 18

Full form of NENO.

A. Neither even nor odd

B. Neither energy nor odd

C. Neither even nor original

D. Neither even nor orthogonal

Question 19

Speed of DC shunt motor is directly proportional to___________

A. Eb

B. ?

C. Vt

D. Ia.Ra

Question 20

The characteristics shown by an element in the V-I curve is V=Is(1-e-V/K). The nature of the element is _______

A. Non-linear, Bilateral, Passive

B. Linear, Unilateral, Active

C. Linear, Bilateral, Passive

D. Non-linear, Unilateral, Passive

Question 21

The cosine function is an even function.

A. True

B. False

Question 22

The forced response is due to a source present in the circuit.

A. True

B. False

Question 23

The maximum current in the inductor IL(t)=Io(1 e-t/?) is __________

A. Io e-t/?

B. Io

C. 2Io

D. -Io

Question 24

The maximum Voltage across the capacitor Vc(t)=Vo(1- e-t) is __________

A. Vo

B. 2Vo

C. 3Vo

D. -Vo

Question 25

The natural response is due to _________ conditions present in the circuit.

A. Initial

B. Final

C. Zero

D. Negative

Question 26

The quality factor is calculated for ___________

A. Power factor loads

B. Inductive coils

C. Lagging loads

D. Leading loads

Question 27

The sine function is an odd function.

A. True

B. False

Question 28

Transient response is a temporary response.

A. True

B. False

Question 29

Calculate the equivalent resistance when two armature resistances are connected in parallel of values 6 Ω, 3 Ω.

A. 3 Ω

B. 2 Ω

C. 4 Ω

D. 7 Ω

Question 30

Calculate the equivalent resistance when two resistances are connected in parallel of values 8 Ω, 8 Ω.

A. 3 Ω

B. 2 Ω

C. 4 Ω

D. 7 Ω

Question 31

Calculate the quality factor for the R-C circuit if R=1 Ω and C=1 F.

A. 2

B. 4

C. 1

D. 5

Question 32

Calculate the quality factor for the R-C circuit if R=2 Ω and C=1 F.

A. 0.2

B. 0.4

C. 0.6

D. 0.5

Question 33

Calculate the quality factor for the R-L circuit if R=16 Ω and XL=8 Ω with supply frequency is 1 rad/sec.

A. 2

B. 6

C. 0

D. 7

Question 34

Calculate the quality factor for the R-L circuit if R=28 Ω and L=2 H.

A. 14

B. 16

C. 10

D. 17

Question 35

Calculate the value of the capacitive reactance during resonance if the value of the inductor is 5 H and supply frequency is 20 rad/sec.

A. 100 Ω

B. 200 Ω

C. 300 Ω

D. 700 Ω

Question 36

Speed of DC shunt motor is directly proportional to___________

A. Eb

B. Φ

C. Vt

D. Ia.Ra

Question 37

The maximum current in the inductor IL(t)=Io(1 – e-t/α) is __________

A. Io e-t/α

B. Io

C. 2Io

D. #NAME?

Question 38

The maximum Voltage across the capacitor Vc(t)=Vo(1- e-t) is __________

A. Vo

B. 2Vo

C. 3Vo

D. #NAME?