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Test: Circuit Model of DC Machines - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test Electrical Machines - Test: Circuit Model of DC Machines

Test: Circuit Model of DC Machines for Electrical Engineering (EE) 2024 is part of Electrical Machines preparation. The Test: Circuit Model of DC Machines questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Circuit Model of DC Machines MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Circuit Model of DC Machines below.
Solutions of Test: Circuit Model of DC Machines questions in English are available as part of our Electrical Machines for Electrical Engineering (EE) & Test: Circuit Model of DC Machines solutions in Hindi for Electrical Machines course. Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free. Attempt Test: Circuit Model of DC Machines | 10 questions in 10 minutes | Mock test for Electrical Engineering (EE) preparation | Free important questions MCQ to study Electrical Machines for Electrical Engineering (EE) Exam | Download free PDF with solutions
Test: Circuit Model of DC Machines - Question 1
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If the terminal voltage of 220-V dc machine having armature resistance of 1 ohm. The induced emf produced is 200-V. The armature current for the above machine is

Detailed Solution for Test: Circuit Model of DC Machines - Question 1

I = (V-E)/r
= (220-200)/1
=20 A.

Test: Circuit Model of DC Machines - Question 2
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The shaft power at the DC Generator is

Detailed Solution for Test: Circuit Model of DC Machines - Question 2

 The shaft power is sum of mechanical power and rotational losses.

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Test: Circuit Model of DC Machines - Question 3
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If the electromagnetic torque in a DC shunt-generator is opposite, what can be further concluded?

Detailed Solution for Test: Circuit Model of DC Machines - Question 3

When the electromagnetic torque is in opposite direction, it is of motoring nature.

Test: Circuit Model of DC Machines - Question 4
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The conductor EMF and current are in _____ direction and developed torque is in _____ for generating mode.
Detailed Solution for Test: Circuit Model of DC Machines - Question 4

The conductor emf and current will be in same direction and the developed torque is in opposite direction for a generator.

Test: Circuit Model of DC Machines - Question 5
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If the armature terminal voltage is more that its induced EMF, the DC machine given is
Detailed Solution for Test: Circuit Model of DC Machines - Question 5

As the terminal voltage is lesser than armature voltage, the supply is fed to the machine and so it will be acting like a motor.

Test: Circuit Model of DC Machines - Question 6
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Consider a 200V, 25kW, 30A DC machine lap connected with armature resistance of 0.4 ohms. If the machine is later wave wound, then the developed power is
Detailed Solution for Test: Circuit Model of DC Machines - Question 6

The power of the machine remains unaltered by the type of connections.

Test: Circuit Model of DC Machines - Question 7
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If the DC machine is held constant at 3000 rpm. The DC voltage is 250V and speed is 2950. If the field is held constant with 250V. Is this machine generator or motor?
Detailed Solution for Test: Circuit Model of DC Machines - Question 7

 From the speed and emf relation, E = 250*2950/3000
= 245.8 V
This is less than the terminal voltage. Hence it is a motor.

Test: Circuit Model of DC Machines - Question 8
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 A shunt generator has an induced voltage on open circuit of 127 V. When the machine is on load the terminal voltage is 120 V. The load current if the field resistance be 15 ohm and armature resistance be 15 ohm.
Detailed Solution for Test: Circuit Model of DC Machines - Question 8

Ia*Ra = E-V
= 127 – 120
= 7 V
Ia = 350 A
Ish = 120/15
= 8 A
I = 350 – 8
= 342 A

Test: Circuit Model of DC Machines - Question 9
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The circuit depicting the equation V=Ea + I*Ra.
Detailed Solution for Test: Circuit Model of DC Machines - Question 9

 This is a motor performance equation.

Test: Circuit Model of DC Machines - Question 10
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The voltage drop at brush-commutator contact is variable (1-2V) and dependent of armature current.​
Detailed Solution for Test: Circuit Model of DC Machines - Question 10

The voltage drop at brush-commutator contact is variable (1-2V) and independent of armature current.

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