991 + Mcqs in Machine Design Page 16 McqOptions

751.	The resistivity of water should not be less than
A.	10 Q m
B.	100 Q m
C.	1000 Q m
D.	2000 Q m
Answer» E.

Discussion

752.	If an instrument has cramped scale for larger values, then it follows
A.	square law
B.	logarithmic law
C.	uniform law
D.	none of the above
Answer» C. uniform law

Discussion

753.	Tractive magnets are operated from
A.	a.c. supply
B.	d.c. supply
C.	either a.c. or d.c. supply
D.	none of the above
Answer» D. none of the above

Discussion

754.	A power factor meter has
A.	one current circuit and two pressure circuits
B.	one current circuit and one pressure circuit
C.	two current circuits and one pres¬sure circuit
D.	none of the above
Answer» B. one current circuit and one pressure circuit

Discussion

755.	D.C. servomotors are used in
A.	Purely D.C. control systems
B.	Purely AC. control systems
C.	Both D.C. and AC. control systems
D.	None of the above
Answer» B. Purely AC. control systems

Discussion

756.	For measurement of inductance having high value, we should use
A.	Maxwell’s bridge
B.	Maxwell Wein bridge
C.	Hay’s bridge
D.	Any of the above
Answer» D. Any of the above

Discussion

757.	The laminations of the armature of a D.C. machine are usually _____ thick.
A.	0.1 to 0.2 mm
B.	0.2 to 0.3 mm
C.	0.3 to 0.4 mm
D.	0.4 to 0.5 mm
Answer» E.

Discussion

758.	Murray loop test can be used for location of
A.	ground fault on a cable
B.	short circuit fault on a cable
C.	both the ground fault and the short-circuit fault
D.	none of the above
Answer» D. none of the above

Discussion

759.	According to application, instruments are classified as
A.	switch board
B.	portable
C.	both (A) and (B)
D.	moving coil
E.	moving iron
Answer» D. moving coil

Discussion

760.	Direct water cooling of rotor winding presents
A.	No mechanical difficulties
B.	Lesser mechanical difficulties
C.	Greater mechanical difficulties
D.	None of the above
Answer» D. None of the above

Discussion

761.	Most sensitive galvanometer is
A.	elastic galvanometer
B.	vibration galvanometer
C.	Duddlb galvanometer
D.	spot ballistic galvanometer
Answer» E.

Discussion

762.	Which of the following in an application of D.C. motors?
A.	Traction
B.	Drives for process industry
C.	Battery driven vehicles
D.	Automatic control
E.	All of the above
Answer» F.

Discussion

763.	The scale of a rectifier instrument is
A.	linear
B.	non-linear
C.	either (A) or (B)
D.	neither (A) nor (B)
Answer» B. non-linear

Discussion

764.	The operation of a D.C. machine with large air gap lengths is comparatively
A.	quiet
B.	noisy
C.	either of the above
D.	none of the above
Answer» B. noisy

Discussion

765.	In a D.C. machine the number of brush arms is _____ the number of poles.
A.	less than
B.	equal to
C.	greater than
D.	none of the above
Answer» C. greater than

Discussion

766.	The change in flux linkages can be caused in which of the following ways ?
A.	The flux is constant with respect to time and is stationary and the coil moves through it
B.	The coil is stationary with respect to flux and the flux varies in magnitude with respect to time
C.	Both the changes mentioned above occur together, i.e., the coil moves through a time vary-ing field
D.	All of the above
Answer» E.

Discussion

767.	The high voltage winding is usually which of the following type ?
A.	Cylindrical winding with circular conductors
B.	Cross-over winding with either circular or small rectangular conductors
C.	Continuous disc type winding with rectangular conductors
D.	All of the above types
Answer» E.

Discussion

768.	Damping of the Ballistic galvanometer is made small to
A.	get first deflection large
B.	make the system oscillatory
C.	make the system critically damped
D.	get minimum overshoot
Answer» B. make the system oscillatory

Discussion

769.	Commonly used standard capacitor is
A.	spherical type
B.	concentric cylindrical type
C.	electrostatic type
D.	multilayer parallel plate type
Answer» C. electrostatic type

Discussion

770.	Aluminium when adopted as a conductor material in ______ transformers, decreases the overall cost of the transformer
A.	small size
B.	medium size
C.	large size
D.	any of the above size
Answer» B. medium size

Discussion

771.	Which of the following is an essential part of a motor meter ?
A.	An operating torque system
B.	A braking device
C.	Revolution registering device
D.	All of the above
Answer» E.

Discussion

772.	The gravity controlled instrument has crowded scale because current is proportional to
A.	balancing weight
B.	deflection angle
C.	sine of deflection angle
D.	All of the above
Answer» D. All of the above

Discussion

773.	A direct current can be measured by
A.	a D.C. potentiometer directly
B.	a D.C. potentiometer in conjunction with a standard resistance
C.	a D.C. potentiometer in conjunction with a volt ratio box
D.	none of the above
Answer» C. a D.C. potentiometer in conjunction with a volt ratio box

Discussion

774.	Which of the following meters are not used on D.C. circuits
A.	Mercury motor meters
B.	Commutator motor meters
C.	Induction meters
D.	None of the above
Answer» D. None of the above

Discussion

775.	Yokes with rectangular cross-section are used for
A.	small capacity transformers
B.	medium capacity transformers
C.	large capacity transformers
D.	any of the above
Answer» B. medium capacity transformers

Discussion

776.	________ is the common method of applying brushes to the commntator.
A.	Radial
B.	Trailing
C.	Reaction
D.	All of the above
Answer» E.

Discussion

777.	________ has a lowrelative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable.
A.	Cast steel
B.	Aluminium
C.	Soft steel
D.	Cast iron
Answer» E.

Discussion

778.	Which of the following methods is most accurate ?
A.	Equivalent current method
B.	Equivalent power method
C.	Equivalent torque method
D.	Method of average losses
Answer» B. Equivalent power method

Discussion

779.	Is universally used for windings of electrical machines because it is easily workable without any possibility of
A.	fracture
B.	Silver
C.	Steel
D.	Aluminium
E.	Copper
Answer» E. Copper

Discussion

780.	Commonly used instruments in power system measurement are
A.	induction
B.	moving coil or iron
C.	rectifier
D.	electrostatic
Answer» B. moving coil or iron

Discussion

781.	For measuring a very high resistance we should use
A.	Kelvin’s double bridge
B.	Wheat stone bridge
C.	Meggar
D.	None of the above
Answer» D. None of the above

Discussion

782.	Which of the following is the basic consideration in the design of insulation ?
A.	Electrical considerations
B.	Mechanical considerations
C.	Thermal considerations
D.	All of the above
Answer» E.

Discussion

783.	Power transformers have rating
A.	equal to 50 kVA
B.	equal to 100 kVA
C.	above 200 kVA
D.	none of the above
Answer» D. none of the above

Discussion

784.	The mcrease in heat dissipation by air blasts is due to increase in
A.	conduction
B.	convection
C.	radiation
D.	any ofthe above
Answer» C. radiation

Discussion

785.	are always double layer type.
A.	Closed windings
B.	Open windings
C.	Either of the above
D.	None of the above
Answer» B. Open windings

Discussion

786.	Is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another,
A.	Tangent galvanometer
B.	Meggar
C.	Current transformer
D.	None of the above
Answer» C. Current transformer

Discussion

787.	A universal RLC bridge uses
A.	Maxwell bridge configuration for measurement of inductance and De Santas bridge for measurement of capacitance
B.	Maxwell Wein bridge for measurement of inductance and modified De Santy’s bridge for measurement of capacitance
C.	Maxwell Wein bridge for measurement of inductance and Wein bridge for measurement of capacitance
D.	Any of the above
Answer» C. Maxwell Wein bridge for measurement of inductance and Wein bridge for measurement of capacitance

Discussion

788.	Alternating current is measured by
A.	induction ammeter
B.	permanent magnet type ammeter
C.	electrostatic ammeter
D.	moving iron repulsion type voltmeter
Answer» B. permanent magnet type ammeter

Discussion

789.	By which of the following methods the temperature rise of windings and other parts may be determined ?
A.	Thermometer method
B.	Resistance method
C.	Embedded temperature detector method
D.	Any of the above
Answer» E.

Discussion

790.	The winding where dummy coils are used is sometimes called
A.	Duplex winding
B.	Triplex winding
C.	Forced winding
D.	None of the above
Answer» D. None of the above

Discussion

791.	In Weston synchronoscope the moving coil is connected across
A.	bus-bars
B.	incoming alternator
C.	fixed coils
D.	any of the above
Answer» B. incoming alternator

Discussion

792.	Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?
A.	Absolute instruments
B.	Indicating instruments
C.	Recording instruments
D.	Integrating instruments
Answer» C. Recording instruments

Discussion

793.	The weight of copper of both armature and field windings decreases with _____ in number of poles.
A.	increase
B.	decrease
C.	either of the above
D.	none of the above
Answer» B. decrease

Discussion

794.	A sensitive galvanometer produces large deflection for a
A.	small value of current
B.	large value of current
C.	large value of power
D.	large value of voltage
E.	none of the above
Answer» B. large value of current

Discussion

795.	If an inductance is connected in one arm of bridge and resistances in the remaining three arms
A.	the bridge can always be balanced
B.	the bridge cannot be balanced
C.	the bridge can be balanced if the resistances have some specific values
D.	none of the above
Answer» C. the bridge can be balanced if the resistances have some specific values

Discussion

796.	Resistances can be measured with the help of
A.	wattmeters
B.	voltmeters
C.	ammeters
D.	ohmmeters and resistance bridges
E.	all of the above
Answer» E. all of the above

Discussion

797.	Disc windings are primarily used in
A.	short capacity transformers
B.	medium capacity transformers
C.	high capacity transformers
D.	any of the above
Answer» D. any of the above

Discussion

798.	Materials exhibiting zero value of resistivity are known as ______ .
A.	conductors
B.	semiconductors
C.	insulators
D.	superconductors
Answer» E.

Discussion

799.	In a low power factor wattmeter the pressure coil is connected
A.	to the supply side of the current coil
B.	to the load side of the current coil
C.	in any of the two meters at connection
D.	none of the above
Answer» C. in any of the two meters at connection

Discussion

800.	The use of _____ instruments is merely confined within laboratories as standardizing instruments.
A.	absolute
B.	indicating
C.	recording
D.	integrating
E.	none of the above
Answer» B. indicating

Discussion

Explore topic-wise MCQs in GATE (Mechanical Engineering).

The resistivity of water should not be less than

If an instrument has cramped scale for larger values, then it follows

Tractive magnets are operated from

A power factor meter has

D.C. servomotors are used in

For measurement of inductance having high value, we should use

The laminations of the armature of a D.C. machine are usually _____ thick.

Murray loop test can be used for location of

According to application, instruments are classified as

Direct water cooling of rotor winding presents

Most sensitive galvanometer is

Which of the following in an application of D.C. motors?

The scale of a rectifier instrument is

The operation of a D.C. machine with large air gap lengths is comparatively

In a D.C. machine the number of brush arms is _____ the number of poles.

The change in flux linkages can be caused in which of the following ways ?

The high voltage winding is usually which of the following type ?

Damping of the Ballistic galvanometer is made small to

Commonly used standard capacitor is

Aluminium when adopted as a conductor material in ______ transformers, decreases the overall cost of the transformer

Which of the following is an essential part of a motor meter ?

The gravity controlled instrument has crowded scale because current is proportional to

A direct current can be measured by

Which of the following meters are not used on D.C. circuits

Yokes with rectangular cross-section are used for

________ is the common method of applying brushes to the commntator.

________ has a lowrelative permeability and is used principally in field frames when cost is of primary importance and extra weight is not objectionable.

Which of the following methods is most accurate ?

Is universally used for windings of electrical machines because it is easily workable without any possibility of

Commonly used instruments in power system measurement are

For measuring a very high resistance we should use

Which of the following is the basic consideration in the design of insulation ?

Power transformers have rating

The mcrease in heat dissipation by air blasts is due to increase in

are always double layer type.

Is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another,

A universal RLC bridge uses

Alternating current is measured by

By which of the following methods the temperature rise of windings and other parts may be determined ?

The winding where dummy coils are used is sometimes called

In Weston synchronoscope the moving coil is connected across

Which of the following instruments indicate the instantaneous value of the electrical quantity being measured at the time at which it is being measured ?

The weight of copper of both armature and field windings decreases with _____ in number of poles.

A sensitive galvanometer produces large deflection for a

If an inductance is connected in one arm of bridge and resistances in the remaining three arms

Resistances can be measured with the help of

Disc windings are primarily used in

Materials exhibiting zero value of resistivity are known as ______ .

In a low power factor wattmeter the pressure coil is connected

The use of _____ instruments is merely confined within laboratories as standardizing instruments.