Question 1

Which of the following is preferred for automatic drives ?

Accepted Answer

A) Synchronous motors 
B) Squirrel cage induction motor 
C) Ward Leonard controlled dc motors 
A) Synchronous motors 
B) Squirrel cage induction motor 
C) Ward Leonard controlled dc motors C

Question 2

In DC chopper, the waveform for input and output voltages is respectively __________

Accepted Answer

A) Discontinuous and Continuous 
B) Continuous and Discontinuous 
C) Both continuous 
D) Both discontinuous 
A) Discontinuous and Continuous 
B) Continuous and Discontinuous 
C) Both continuous 
D) Both discontinuous B

Question 3

The motor normally used for crane travel is

Accepted Answer

A) AC slip ring motor 
B) Ward Leonard controlled DC shunt motor 
C) Synchronous motor 
D) DC differentially compound motor. 
A) AC slip ring motor 
B) Ward Leonard controlled DC shunt motor 
C) Synchronous motor 
D) DC differentially compound motor. A

Question 4

Which of the following devices should be used as a switch for high power and high voltage application?

Accepted Answer

A) GTO 
B) MOSFET 
C) TRIAC 
D) Thyristor 
A) GTO 
B) MOSFET 
C) TRIAC 
D) Thyristor

Question 5

Choose the correct one. (* stands for multiplication, J represents the moment of inertia, w represents angular spee(D).

Accepted Answer

A) J*d(w)/dt = Load torque - Motor torque 
B) J*d(w)/dt = Load torque + Motor torque 
C) J*d(w)/dt = Motor torque - Load torque 
D) J*d(w)/dt = Load torque * Motor torque 
A) J*d(w)/dt = Load torque - Motor torque 
B) J*d(w)/dt = Load torque + Motor torque 
C) J*d(w)/dt = Motor torque - Load torque 
D) J*d(w)/dt = Load torque * Motor torque

Question 6

The unit of angular velocity is rad/s .

Accepted Answer

A) True 
B) False 
C) none 
D) all of the above 
A) True 
B) False 
C) none 
D) all of the above

Question 7

Load torque of the crane is independent of _________

Accepted Answer

A) Speed 
B) Seebeck effect 
C) Hall effect 
D) Thomson effect 
A) Speed 
B) Seebeck effect 
C) Hall effect 
D) Thomson effect

Question 8

A chopper behaves as a __________

Accepted Answer

A) DC equivalent of AC switching device 
B) DC equivalent of AC transformer 
C) DC equivalent of AC relay 
D) AC equivalent of circuit breaker 
A) DC equivalent of AC switching device 
B) DC equivalent of AC transformer 
C) DC equivalent of AC relay 
D) AC equivalent of circuit breaker

Question 9

Which of the following device is NOT suitable for parallel operation?

Accepted Answer

A) MOSFET 
B) BJT 
C) IGBT 
D) TRIAC 
A) MOSFET 
B) BJT 
C) IGBT 
D) TRIAC

Question 10

Calculate the useful power developed by a motor using the given data: P = 3000 W, I = 60 A, R = .4 ?. Assume frictional losses are 200 W and windage losses are 400 W.

Accepted Answer

A) 970 W 
B) 960 W 
C) 980 W 
D) 990 W 
A) 970 W 
B) 960 W 
C) 980 W 
D) 990 W

Question 11

What type of force handles for active torques?

Accepted Answer

A) Strong nuclear forces 
B) Weak nuclear forces 
C) Gravitational forces 
D) Electrostatic forces 
A) Strong nuclear forces 
B) Weak nuclear forces 
C) Gravitational forces 
D) Electrostatic forces

Question 12

The turn-o times of the devices in increasing order is ___________
I. MOSFET
II. BJT
III. IGBT
IV. Thyristor

Accepted Answer

A) I, III, II, IV 
B) I, II, III, IV 
C) III, I, II, IV 
D) III, II, IV, I 
A) I, III, II, IV 
B) I, II, III, IV 
C) III, I, II, IV 
D) III, II, IV, I

Question 13

A DC chopper feeds an RLE load. If the value of E is increased by 20%, the current ripple ________

Accepted Answer

A) increases by 20% 
B) decreases by 20% 
C) increases only 20% 
D) remains the same 
A) increases by 20% 
B) decreases by 20% 
C) increases only 20% 
D) remains the same

Question 14

Which of the following device should be used as a switch in a low power switched mode power supply (SMPS)?

Accepted Answer

A) GTO 
B) BJT 
C) MOSFET 
D) TRIAC 
A) GTO 
B) BJT 
C) MOSFET 
D) TRIAC

Question 15

Calculate the time period of the waveform x(t)=24sin(24?t+?÷4).

Accepted Answer

A) 064 sec 
B) 047 sec 
C) 083 sec 
D) 015 sec 
A) 064 sec 
B) 047 sec 
C) 083 sec 
D) 015 sec

Question 16

The conduction loss versus device current characteristic of a power MOSFET is best approximated by a ________

Accepted Answer

A) Straight line 
B) Rectangular hyperbola 
C) Parabola 
D) Exponential decaying functions 
A) Straight line 
B) Rectangular hyperbola 
C) Parabola 
D) Exponential decaying functions

Question 17

Torque inversely varies with the speed in the windage load torque component.

Accepted Answer

A) True 
B) False 
C) none 
D) all of the above 
A) True 
B) False 
C) none 
D) all of the above

Question 18

The consideration involved in the selection of the type of electric drive for a particular application depends on

Accepted Answer

A) Speed control range and its nature 
B) Starting torque 
C) Environmental conditions 
D) All of the above. 
A) Speed control range and its nature 
B) Starting torque 
C) Environmental conditions 
D) All of the above.

Question 19

Among the following which one exhibits linearly rising load torque characteristics?

Accepted Answer

A) Elevators 
B) Rolling Mills 
C) Fan load 
D) Separately excited dc generator connected to the resistive load 
A) Elevators 
B) Rolling Mills 
C) Fan load 
D) Separately excited dc generator connected to the resistive load

Question 20

R.M.S value of the sinusoidal waveform V=V sin(?t+?).

Accepted Answer

A) V ÷2 
B) V ÷2. 
C) V ÷2.. 
D) V ÷3 
A) V ÷2 
B) V ÷2. 
C) V ÷2.. 
D) V ÷3

Which of the following is preferred for automatic drives ?

In DC chopper, the waveform for input and output voltages is respectively __________

The motor normally used for crane travel is

Which of the following devices should be used as a switch for high power and high voltage application?

Choose the correct one. (* stands for multiplication, J represents the moment of inertia, w represents angular spee(D).

The unit of angular velocity is rad/s .

Load torque of the crane is independent of _________

A chopper behaves as a __________

Which of the following device is NOT suitable for parallel operation?

Calculate the useful power developed by a motor using the given data: P = 3000 W, I = 60 A, R = .4 ?. Assume frictional losses are 200 W and windage losses are 400 W.

What type of force handles for active torques?

The turn-o times of the devices in increasing order is ___________ I. MOSFET II. BJT III. IGBT IV. Thyristor

A DC chopper feeds an RLE load. If the value of E is increased by 20%, the current ripple ________

Which of the following device should be used as a switch in a low power switched mode power supply (SMPS)?

Calculate the time period of the waveform x(t)=24sin(24?t+?÷4).

The conduction loss versus device current characteristic of a power MOSFET is best approximated by a ________

Torque inversely varies with the speed in the windage load torque component.

The consideration involved in the selection of the type of electric drive for a particular application depends on

Among the following which one exhibits linearly rising load torque characteristics?

R.M.S value of the sinusoidal waveform V=V sin(?t+?).

Electric Motors: Selection, Types, and Applications

Motor Selection and Applications in Various Industries

Motor for Various Applications

Motor and Drive System

Motor and Crane Technology: Understanding the Different Types and Applications

Electric Motors and Drives: Exploring Speed, Control, and Efficiency

Contactors, Motors, and Load Torques

Motors and Drives for Industrial Applications

Motor and Power Systems

Locomotives and Train Systems

Traction Systems and Locomotive Performance

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Exam 8: Electrical Drives and Components

Which of the following is preferred for automatic drives ?

In DC chopper, the waveform for input and output voltages is respectively __________

The motor normally used for crane travel is

Which of the following devices should be used as a switch for high power and high voltage application?

Choose the correct one. (* stands for multiplication, J represents the moment of inertia, w represents angular spee(D).

The unit of angular velocity is rad/s .

Load torque of the crane is independent of _________

A chopper behaves as a __________

Which of the following device is NOT suitable for parallel operation?

Calculate the useful power developed by a motor using the given data: P = 3000 W, I = 60 A, R = .4 ?. Assume frictional losses are 200 W and windage losses are 400 W.

What type of force handles for active torques?

The turn-o times of the devices in increasing order is ___________ I. MOSFET II. BJT III. IGBT IV. Thyristor

A DC chopper feeds an RLE load. If the value of E is increased by 20%, the current ripple ________

Which of the following device should be used as a switch in a low power switched mode power supply (SMPS)?

Calculate the time period of the waveform x(t)=24sin(24?t+?÷4).

The conduction loss versus device current characteristic of a power MOSFET is best approximated by a ________

Torque inversely varies with the speed in the windage load torque component.

The consideration involved in the selection of the type of electric drive for a particular application depends on

Among the following which one exhibits linearly rising load torque characteristics?

R.M.S value of the sinusoidal waveform V=V sin(?t+?).

Electric Motors: Selection, Types, and Applications

Motor Selection and Applications in Various Industries

Motor for Various Applications

Motor and Drive System

Motor and Crane Technology: Understanding the Different Types and Applications

Electric Motors and Drives: Exploring Speed, Control, and Efficiency

Contactors, Motors, and Load Torques

Motors and Drives for Industrial Applications

Motor and Power Systems

Locomotives and Train Systems

Traction Systems and Locomotive Performance

Filters