emec quiz
TRANSCRIPT
MEERUT INSTITUTE OF TECHNOLOGY,292ELECTROMECHANICAL ENERGY CONVERSION-I LAB (EEE-451)
Time: 20 Minutes
Name Of Student: Roll No:
LAB QUIZ
1 For a simplex lap winding, the winding pitch is equal to
a) 2 b) -2 c) ± 1 d) ± 2.
2 The number of commutator segments in a dc machine is equal to the no. of
a) coil-sides b) turns c) coils d) slots.
3 In an oil filled transformer, oil is provided for
a) Cooling b) Insulation c) Lubricating d)
4 Sparkless commutation can be achieved by employing
a) Interpoles b) Compensating winding c) d) All the above
5 In DC machine, commuataor converts
a) dc to ac b) ac to dc c) both ac to dc and dc to ac d) None of the above
6 In DC machine
a) The current and electromagentic force in armature conductors are alternating while those at the terminals are uni-direction
b) The current and emf in armature conductors are uni directional while those at the terminals are alternating
c) The current and the emf in armature conductors and at terminals are unidirectional
d) The emf in armature conductors and at the terminals is alternating while current is uni directional
7 An ideal transformer is one which has
a) No winding resistance b) No leakage reactance c) No losses d) All of above
8 The input power under no load condition of transformer consists of
a) Core losses in transformer
b) core losses and very small amount of copper loss in primary.
c) copper loss in transformers
d) significant amount of copper loss along with negligible amount of core losses.
9 At what power factor, the voltage regulation of a transformer can be zero ?
a) Leading power factor b) Lagging power factor c) Unity power factor d) Zero power factor
10 In a transformer short circuit test and open circuit test are conducted
a) in LV side of transformer b) c) d) in HV side of transformer
Question No : 1 2 3 4 5 6 7 8 9 10
Option :
Internal Examiner External Examiner
SET
A
Both cooling and insulation
High resistance corbon brushes
in HV side and LV side of transformer respectively
in LV side and HV side of transformer respectively
MEERUT INSTITUTE OF TECHNOLOGY,292ELECTROMECHANICAL ENERGY CONVERSION-I LAB (EEE-451)
Time: 20 Minutes
Name Of Student: Roll No:
LAB QUIZ
1
a) b) c) d)
2 In DC Generator the critical resistance refers to:
a) Armature b) Field c) Load d) Commutator
3 In DC Generator the residual magnetism will be of the order:
a) 2.50% b) 10% c) 15% d) 20%
4 Comutator in DC machine acts as:
a) Full wave rectifier b) Half wave rectifier c) d)
5 The yoke of the dc machine is made of:____ magnetic material
a) soft b) hard c) non d) very good
6 Iron loss in transformer can be determined by
a) Short Circuit Test b) Open Circuit Test c) d) None of the above
7 The maximum efficiency of a transformer occurs when
a) Iron loss > Copper loss b) Iron loss < Copper loss c) Iron loss = Copper loss d) Iron loss = zero
8 Transformers operating in parallel will share the load depending upon their
a) Leakage reactance. b) Rating. c) Efficiency. d) Percentage impedance.
9 Oil is provided in an Oil filled transformer
a) b) insulating c) lubrication d) cooling
10 An ideal transformer is one which has
a) No winding resistance b) No leakage reactance c) No losses d) All of above
Question No : 1 2 3 4 5 6 7 8 9 10
Option :
Internal Examiner External Examiner
SET
B
For simplex wave and lap windings, the back pitch yb and front pitch yf are as follows:
yb is odd, yf is even yb is even, yfis odd both yb and yf are odd both yb and yf are even.
Controlled full wave rectifier
Controlled half wave rectifier
Both Short Circuit and Open Circuit Tests
both cooling and insulation
MEERUT INSTITUTE OF TECHNOLOGY,292ELECTROMECHANICAL ENERGY CONVERSION-I LAB (EEE-451)
Time: 20 Minutes
Name Of Student: Roll No:
LAB QUIZ1 For a simplex lap winding, the winding pitch is equal to
a) 2 b) -2 c) ± 1 d) ± 2.Answer: D
2 The number of commutator segments in a dc machine is equal to the no. ofa) coil-sides b) turns c) coils d) slots.
Answer: C
3 In an oil filled transformer, oil is provided fora) Cooling b) Insulation c) Lubricating d)
Answer: D
4 Sparkless commutation can be achieved by employinga) Interpoles b) Compensating winding c) d) All the above
Answer: D
5 In DC machine, commuataor convertsa) dc to ac b) ac to dc c) both ac to dc and dc to ac d) None of the above
Answer: C
6 In DC machinea) The current and electromagentic force in armature conductors are alternating while those at the terminals are uni-directionalb) The current and emf in armature conductors are uni directional while those at the terminals are alternatingc) The current and the emf in armature conductors and at terminals are unidirectionald) The emf in armature conductors and at the terminals is alternating while current is uni directional
Answer: A
7 An ideal transformer is one which hasa) No winding resistance b) No leakage reactance c) No losses d) All of above
Answer: D
8 The input power under no load condition of transformer consists ofa) Core losses in transformerb) core losses and very small amount of copper loss in primary.c) copper loss in transformersd) significant amount of copper loss along with negligible amount of core losses.
Answer: B
9 At what power factor, the voltage regulation of a transformer can be zero ?a) Leading power factor b) Lagging power factor c) Unity power factor d) Zero power factor
Answer: A
10 In a transformer short circuit test and open circuit test are conducteda) in LV side of transformer b) c) d) in HV side of transformer
Answer: B
Question No : 1 2 3 4 5 6 7 8 9 10
Option :
SET
A
Both cooling and insulation
High resistance corbon brushes
in HV side and LV side of transformer respectively
in LV side and HV side of transformer respectively
Internal Examiner External Examiner
MEERUT INSTITUTE OF TECHNOLOGY,292ELECTROMECHANICAL ENERGY CONVERSION-I LAB (EEE-451)
Time: 20 Minutes
Name Of Student: Roll No:
LAB QUIZ
1
a) b) c) d)
Answer: C
2 In DC Generator the critical resistance refers to:a) Armature b) Field c) Load d) Commutator
Answer: B
3 In DC Generator the residual magnetism will be of the order:a) 2.50% b) 10% c) 15% d) 20%
Answer: A
4 Comutator in DC machine acts as:a) Full wave rectifier b) Half wave rectifier c) d)
Answer: A
5 The yoke of the dc machine is made of:____ magnetic materiala) soft b) hard c) non d) very good
Answer: A
6 Iron loss in transformer can be determined bya) Short Circuit Test b) Open Circuit Test c) d) None of the above
Answer: B
7 The maximum efficiency of a transformer occurs whena) Iron loss > Copper loss b) Iron loss < Copper loss c) Iron loss = Copper loss d) Iron loss = zero
Answer: C
8 Transformers operating in parallel will share the load depending upon theira) Leakage reactance. b) Rating. c) Efficiency. d) Percentage impedance.
Answer: B
9 Oil is provided in an Oil filled transformera) b) insulating c) lubrication d) cooling
Answer: A
10 An ideal transformer is one which hasa) No winding resistance b) No leakage reactance c) No losses d) All of above
Answer: D
Question No : 1 2 3 4 5 6 7 8 9 10
Option :
Internal Examiner External Examiner
SET
B
For simplex wave and lap windings, the back pitch yb and front pitch yf are as follows:
yb is odd, yf is even yb is even, yfis odd both yb and yf are odd both yb and yf are even.
Controlled full wave rectifier
Controlled half wave rectifier
Both Short Circuit and Open Circuit Tests
both cooling and insulation
MEERUT INSTITUTE OF TECHNOLOGY,292ELECTROMECHANICAL ENERGY CONVERSION-I LAB (EEE-451)
Time: 15 Minutes
Name Of Student: Roll No:
LAB QUIZ1 For a simplex lap winding, the winding pitch is equal to
a) 2 b) -2 c) ± 1 d) ± 2.Answer: D
2
a) b) c) d)
Answer: C
3 The number of commutator segments in a dc machine is equal to the no. ofa) coil-sides b) turns c) coils d) slots.
Answer: C
4 In an oil filled transformer, oil is provided fora) Cooling b) Insulation c) Lubricating d)
Answer: D
5 In DC Generator the critical resistance refers to:a) Armature b) Field c) Load d) Commutator
Answer: B
6 In DC Generator the residual magnetism will be of the order:a) 2.50% b) 10% c) 15% d) 20%
Answer: A
7 Sparkless commutation can be achieved by employinga) Interpoles b) Compensating winding c) d) All the above
Answer: D
8 Comutator in DC machine acts as:a) Full wave rectifier b) Half wave rectifier c) d)
Answer: A
9 In DC machine, commuataor convertsa) dc to ac b) ac to dc c) both ac to dc and dc to ac d) None of the above
Answer: C
10 Which type of emf is induced in the dc generatora) Dynamically b) Static c) Electrostatic d) Magentic
Answer: A
11
a) b) c) d)
Answer: A
12 In DC machinea) The current and electromagentic force in armature conductors are alternating while those at the terminals are uni-directionalb) The current and emf in armature conductors are uni directional while those at the terminals are alternatingc) The current and the emf in armature conductors and at terminals are unidirectionald) The emf in armature conductors and at the terminals is alternating while current is uni directional
SET
B
For simplex wave and lap windings, the back pitch yb and front pitch yf are as follows:
yb is odd, yf is even yb is even, yfis odd both yb and yf are odd both yb and yf are even.
Both cooling and insulation
High resistance corbon brushes
Controlled full wave rectifier
Controlled half wave rectifier
If a current carrying conductor is placed in the uniform magnetic field with its plane perpendicular to the direction of magnetic induction then,
The net force and torque on the coil are zero
net force is zero and torque is finite
net force is finite and torque is zero
the net force and torque are finite
Answer: A
13 The induced voltage in a single loop reverses:a) Once in each revolution b) c) d)
Answer: B
14 The yoke of the dc machine is made of:____ magnetic materiala) soft b) hard c) non d) very good
Answer: A
15 An ideal transformer is one which hasa) No winding resistance b) No leakage reactance c) No losses d) All of above
Answer: D
16 The input power under no load condition of transformer consists ofa) Core losses in transformerb) core losses and very small amount of copper loss in primary.c) copper loss in transformersd) significant amount of copper loss along with negligible amount of core losses.
Answer: B
17 Iron loss in transformer can be determined bya) Short Circuit Test b) Open Circuit Test c) d) None of the above
Answer: B
18 The maximum efficiency of a transformer occurs whena) Iron loss > Copper loss b) Iron loss < Copper loss c) Iron loss = Copper loss d) Iron loss = zero
Answer: C
19 At what power factor, the voltage regulation of a transformer can be zero ?a) Leading power factor b) Lagging power factor c) Unity power factor d) Zero power factor
Answer: A
20 Transformers operating in parallel will share the load depending upon theira) Leakage reactance. b) Rating. c) Efficiency. d) Percentage impedance.
Answer: B
21 In a transformer short circuit test and open circuit test are conducteda) in LV side of transformer b) c) d) in HV side of transformer
Answer: B
22 Oil is provided in an Oil filled transformera) b) insulating c) lubrication d) cooling
Answer: A
Question No : 1 2 3 4 5 6 7 8 9 10
Option :
Internal Examiner External Examiner
Once in each half revolution
Once in each one quarter revolution
Once in each two revolutions
Both Short Circuit and Open Circuit Tests
in HV side and LV side of transformer respectively
in LV side and HV side of transformer respectively
both cooling and insulation
