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?